g.

tec – medical engineering GmbH

Sierningstrasse 14, A-4521 Schiedlberg
Austria - Europe
Tel.: (43)-7251-22240-0
Fax: (43)-7251-22240-39
office@gtec.at, http://www.gtec.at

USER MANUAL V5.16.00

Copyright 2007-2017 g.tec medical engineering GmbH
Content:

INTRODUCTION........................................................................................................................................... 5
INTENDED USE ............................................................................................................................................ 6
INDICATIONS FOR USE.................................................................................................................................. 6
RELATED PRODUCTS................................................................................................................................... 7
RELATED DOCUMENTS ................................................................................................................................ 8
CONVENTIONS ............................................................................................................................................ 9
RELEASE NOTES ...................................................................................................................................... 10
NEW FEATURES......................................................................................................................................... 10
CHANGES ................................................................................................................................................. 10
INSTALLATION AND CONFIGURATION ................................................................................................. 11
HARDWARE AND SOFTWARE REQUIREMENTS ............................................................................................. 11
INSTALLATION FROM A CD ......................................................................................................................... 13
UNINSTALL................................................................................................................................................ 14
FILES ON YOUR COMPUTER ....................................................................................................................... 15
BEFORE RUNNING G.RECORDER .......................................................................................................... 16
RUNNING G.RECORDER IN USER MODE .............................................................................................. 17
RECORDER MAIN W INDOW ........................................................................................................................ 18
Status Bar ........................................................................................................................................... 20
Toolbar ............................................................................................................................................... 21
DATA VIEWER ........................................................................................................................................... 24
FEATURE VIEWER ..................................................................................................................................... 25
The Feature Viewer review mode during data acquisition ................................................................. 26
EVOKED POTENTIALS VIEWER ................................................................................................................... 28
LOAD CONFIGURATION .............................................................................................................................. 29
RECORDING INFORMATION......................................................................................................................... 33
DISPLAY SETTINGS.................................................................................................................................... 36
CHANNEL SETTINGS .................................................................................................................................. 37
VIDEO CAMERA ......................................................................................................................................... 39
START AND STOP RECORDING ................................................................................................................... 40
MARKERS ................................................................................................................................................. 41
DIGITAL INPUTS......................................................................................................................................... 43
Individual Triggers .............................................................................................................................. 43
Combined Triggers ............................................................................................................................. 43
LOAD ELECTRODE MONTAGE ..................................................................................................................... 45
LOAD, FIND, CONVERT AND REPLAY RECORDED FILES ............................................................................... 46
Load, Find and Replay HDF5 files ..................................................................................................... 46
CONVERT G.MOBILAB+ BIN FILES TO HDF5 FORMAT................................................................................. 54
PRINT RECORDED FILES ............................................................................................................................ 55
CLOSING THE REVIEW MODE IN G.RECORDER ............................................................................................. 57
CLOSING G.RECORDER ............................................................................................................................. 58
G.USBAMP SPECIFIC FEATURES ................................................................................................................ 59
Impedance Measurement with g.USBamp and g.Recorder ............................................................... 59
Calibration of g.USBamp with g.Recorder ......................................................................................... 60
G.HIAMP SPECIFIC FEATURES.................................................................................................................... 62
Impedance Measurement with g.HIamp and g.Recorder................................................................... 62
Calibration of g.HIamp with g.Recorder ............................................................................................. 63
G.NAUTILUS SPECIFIC FEATURES............................................................................................................... 65
Impedance Measurement with g.Nautilus and g.Recorder ................................................................ 65
Calibration of g.Nautilus with g.Recorder ........................................................................................... 66
RUNNING G.RECORDER IN ADMINISTRATOR MODE .......................................................................... 68

g.Recorder User Manual 5.16.00 2

 ACTIVATE ADMINISTRATOR MODE .............................................................................................................. 69
SELECT AND CONFIGURE HARDWARE ........................................................................................................ 70
g.HIamp .............................................................................................................................................. 70
Digital IN for g.HIamp ......................................................................................................................... 74
g.USBamp version 2.0 and version 3.0 .............................................................................................. 76
Digital IO for g.USBamp version 2.0 .................................................................................................. 79
Digital IO for g.USBamp version 3.0 .................................................................................................. 80
g.MOBIlab+......................................................................................................................................... 82
g.Nautilus ............................................................................................................................................ 87
Digital IN for g.Nautilus ....................................................................................................................... 91
DAQ Simulator.................................................................................................................................... 93
FEATURE DEFINITION ................................................................................................................................ 95
Configure CFM ................................................................................................................................... 97
Configure Heart Rate.......................................................................................................................... 99
Configure CSA.................................................................................................................................. 100
MARKER DEFINITION ............................................................................................................................... 102
EVOKED POTENTIALS DEFINITION ............................................................................................................ 103
SAVE CONFIGURATION ............................................................................................................................ 105
LOAD CONFIGURATION FROM THE COMMAND LINE ..................................................................................... 105

g.Recorder User Manual 5.16.00 3

To the Reader
Welcome to the medical and electrical engineering world of g.tec!
Discover the only professional biomedical signal processing platform under MATLAB and Simulink. Your
ingenuity finds the appropriate tools in the g.tec elements and systems.
Flexibly choose and combine the elements for biosignal amplification, signal processing and stimulation
to perform even real-time feedback.

Our team is prepared to find the best solution for your needs.

Take advantage of our experience!

Dr. Christoph Guger Dr. Guenter Edlinger

Researcher and Developer

Reduce development time for sophisticated real-time applications from month to hours.
Integrate g.tec's open platform seamlessly into your processing system.
g.tec's rapid prototyping environment encourages your creativity.

Scientist

Open new research fields with amazing feedback experiments.

Process your EEG/ECG/EMG/EOG data with g.tec's biosignal analyzing tools.
Concentrate on your core problems by relying on g.tec's new software features to handle ICA, AAR or
online Hjorth's source derivation.

Study design and data analysis

Are you planning an experimental study in the field of brain or life sciences? We can offer consultation in
experimental planning, hardware and software selection and can even do the measurements for you. If
you have already collected EEG/ECG/EMG/EOG, g.tec can analyze the data starting from artifact control,
do feature extraction and prepare the results ready for publication.

g.Recorder User Manual 5.16.00 4

Introduction
Welcome to the g.Recorder.

g.Recorder is a novel, user-friendly software package for the recording of biosignal data such as EEG,
ECoG, ECG, EOG, EMG and sensor data. Trigger information and video sequences can also be
captured. An easy-to-use Replay mode allows for the inspection of data after recording.

g.Recorder has been designed to work with the g.tec biosignal amplifiers, g.HIamp and g.USBamp, and
with the portable devices g.MOBIlab+ and g.Nautilus.

g.Recorder offers raw data inspection and also the extraction and presentation of different parameters.
These include, but are not limited to, heart rate variability, heart rate, compressed spectral arrays, and
cerebral function.

g.Recorder data can be exported seamlessly to g.tec’s biosignal analysis software, g.BSanalyze, for in-
depth offline evaluation and data processing.

g.Recorder User Manual 5.16.00 5

Intended use
g.Recorder is intended to be used for acquisition, processing, recording and review of biosignal data
measured by common g.tec biosignal amplifiers. These biosignals may include electroencephalogram
(EEG), electromyogram (EMG), electrooculogram (EOG), and electrocardiogram (ECG), for example.

The device must not be used for patient monitoring. The device must not be used for the determination of
brain death. Additional examinations are needed for diagnosis, and no diagnosis may be done only based
on using this device.

Indications for use

We have attempted to write this manual as accurately as possible. However, we reserve the right to make
changes to g.Recorder which may render parts of this manual invalid. We assume no liability as a result
of the use or application of this product.

No part of this manual may be copied or reproduced without the express permission of the authors.

g.Recorder User Manual 5.16.00 6

Related Products

g.tec provides several biosignal analysis elements that are especially relevant to the kinds of tasks you
perform with g.Recorder and g.tec’s biosignal amplifiers.

For more detailed information on any of our elements, updates or new extensions please visit our
homepage www.gtec.at or just send us an email at office@gtec.at.

g.Recorder User Manual 5.16.00 7

Related Documents
g.Recorder Quickstart – A short introduction on how to use g.Recorder with g.USBamp, g.HIamp, and
g.MOBIlab+ devices.

g.Recorder Parallel Port Qickstart – A short introduction on how to use stimulus delivery software
E-Prime® (Psychology Software Tools, Inc., www.pstnet.com) and Presentation® (Neurobehavioral
Systems, Inc., www.neurobs.com) over the parallel port with g.HIamp or g.USBamp devices and
g.Recorder.

g.Recorder Evoked Potentials Quickstart – A short introduction on calculation and display of evoked
potentials in g.Recorder with g.USBamp devices using g.HIsys for stimulus presentation.

Furthermore, g.tec can provide tutorials on how to load g.Recorder data into EMSE® Suite, BESA®, and
EEGLAB/ERPLAB Toolbox.

g.Recorder User Manual 5.16.00 8

Conventions

Item Format Example

String Variables Courier New Enter filename e.g. MygRecorderSettings.xml

Menu items Boldface Select Save from the File menu

g.Recorder User Manual 5.16.00 9

Release Notes
Release notes bring to your attention new features of, and changes to, g.Recorder when upgrading to a
newer version.

New features
• Biosignal amplifier g.Nautilus is now supported.

Changes
• Windows 10, 64-bit is now supported; Windows 7 support retired.
• Updated g.HIamp impedance measurement window and corresponding description according to
new driver version.
• The g.HIamp configuration dialog shows an information message now if channel-specific settings
should be applied but no channels are highlighted.
• Added performance hint to feature definition section in manual (regarding CFM/CSA).
• The system requirements have changed.

g.Recorder User Manual 5.16.00 10

Installation and Configuration

Hardware and Software Requirements

g.Recorder requires a PC compatible desktop or notebook workstation running Microsoft® Windows®
operating system1 and, optionally, a color printer. The table below lists optimal settings (depending on the
acquisition hardware):

Hardware Properties
CPU 2 GHz or faster processor
Harddisk 30 GB or higher
RAM 4 GB or higher
USB 2.0 port One free USB port for the hardlock dongle
One free USB port for each g.HIamp device
One free USB port for each g.USBamp device
USB 2.0 port (optional)
One free USB port for each g.Nautilus device
One free USB port for attaching a color printer
Bluetooth® interface2 (optional) Bluetooth® interface for g.MOBIlab+ devices
Screen resolution 1920 x 1080 pixels
Video camera Webcam

g.Recorder acquires data from g.tec’s biosignal amplifiers. Depending on the used devices, the
corresponding drivers for g.HIamp, g.USBamp, g.Nautilus (g.NEEDaccess) or g.MOBIlab+ must be
installed. Depending on the Windows® operating system, administrator rights might be necessary for the
installation.

Software Version
Windows 10 Pro
Microsoft® Windows® English
64-bit
g.HIamp driver 2.16.00
g.USBamp driver 3.16.00
g.MOBIlab+ driver 1.16.00
g.MONcreator 5.16.00
g.NEEDaccess 1.16.01
Sentinel HASP® Runtime Environment3 7.50
Adobe® Acrobat® Reader® 4 DC 2015

1 Microsoft and Windows are either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other
countries.

2 The Bluetooth® word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. Other trademarks and trade names
are those of their respective owners.

3HASP®, Sentinel HASP®, Hardlock®, are registered and/or unregistered trademarks of SafeNet, Inc., or Aladdin Knowledge
Systems, Ltd., in the United States and other countries.

4Adobe, Acrobat, and Reader are either registered trademarks or trademarks of Adobe Systems Incorporated in the United States
and/or other countries.

g.Recorder User Manual 5.16.00 11

Make sure that your Microsoft® Windows® installation works correctly before installing the g.Recorder
software. Other software packages except the packages listed above MUST NOT be installed on the
Windows® PC. During operation of g.Recorder other software as listed above MUST NOT be operated.

g.Recorder User Manual 5.16.00 12

Installation from a CD
Perform the following steps to install g.Recorder software:

1. Insert the g.tec product CD, open the g.Recorder directory on the CD, open the correct
directory for the architecture of your PC (Win64) and double-click setup.exe. If User Account
Control is turned on, additional dialogs may ask for permission. Confirm the dialogs to allow
installation of g.Recorder through User Account Control. The installation starts and displays the
welcome message.

2. Click Next to read the License Agreement. If you agree with the terms, click I Agree and Next.

3. Choose the installation folder (default is C:\Program Files\gtec\) where the install routine
should copy all necessary files and press Next.

4. Follow the instructions on the screen to install g.Recorder. When the following window informs
you about completion of installation, click Close to complete.

g.Recorder User Manual 5.16.00 13

 5. After successful installation, insert the hardlock dongle into a free USB port of your PC or
notebook.

If the computer is connected to the internet, let Windows Update download and install the correct
driver for the hardlock. For manual installation, run the HASPUserSetup.exe from the
prerequisites/HASP HL folder on your g.tec CD.

The red light of the hardlock must be on after successful installation.

Uninstall
To remove g.Recorder in Windows 10, use the Programs and Features tool in the Control Panel.

Note that you have to uninstall the hardlock driver software separately if you uninstall the g.Recorder
software.

g.Recorder User Manual 5.16.00 14

Files on your Computer
g.Recorder files - are stored under (it is assumed that the default path setting is used)

C:\Program Files\gtec\gRecorder

Example configurations - are stored in the subdirectory

C:\Program Files\gtec\gRecorder\Config

Help files - are stored under

C:\Program Files\gtec\gRecorder\Help

Tools - import tool to import HDF5 files to MATLAB stored in

C:\Program Files\gtec\gRecorder\MATLAB Tools

g.Recorder User Manual 5.16.00 15

Before running g.Recorder
It is recommended to turn off Microsoft Windows’ automatic updates while operating g.Recorder.
Concurrent Windows updates could interfere with g.Recorder functionality.

g.Recorder User Manual 5.16.00 16

Running g.Recorder in User Mode
After finishing the installation, g.Recorder can be operated in User Mode with the g.tec biosignal
amplifiers as described in this chapter.

g.Recorder User Manual 5.16.00 17

Recorder Main Window
By double clicking on the g.Recorder icon on the desktop g.Recorder is started in User Mode. This
mode is the standard mode and typically used to acquire data within a specific study using predefined
configurations. Such configurations can be adapted and created by advanced users in the Administrator
Mode.

g.Recorder consists of six elements:

- the Status Bar

- the Toolbar
- the Data Viewer
- the Feature Viewer
- the Video Viewer
- the Evoked Potentials Viewer

In the g.Recorder Menu and Toolbar you can select and set different recording parameters, filenames
and start/stop the actual measurement, etc.

The Data Viewer window shows the raw biosignal data. Using the menu and toolbar window, the number
of channels and the seconds on screen can be adapted, etc. The channel information (number and
name) and the channel scaling is displayed on the left side of the window.

Selected parameters, for example, heart rate and cerebral function are displayed in the Feature Viewer
window. The parameters are displayed from left to right. On the left side of the window the y-axis scaling
as well as the specific feature name are displayed.

In the Video Viewer window the actual video sequence is displayed.

The Evoked Potentials viewer displays calculated evoked potentials for each acquired raw data channel,
if configured. Zooming, scrolling and scaling for the evoked potential plots can be adapted directly in this
viewer.

The Status Bar indicates the actual state of g.Recorder.

You can resize all windows according to your preferences and needs. Individual windows can be hidden
to enlarge for example the area of the Feature Viewer.

Note: The actual layout of the screen and the specific settings are stored to a default configuration file
when g.Recorder is closed. This default configuration is used the next time you start g.Recorder. This
allows easy continuation of your studies. You can of course load another configuration.

g.Recorder User Manual 5.16.00 18

 Menu
Toolbar

Data Viewer

Feature Viewer

Evoked
Potentials

Video Viewer

Status Bar

g.Recorder User Manual 5.16.00 19

Status Bar

The actual status of g.Recorder is displayed in the Status Bar at the bottom of the main window. The
Status Bar shows information that relates to the current recording. The first field shows the current
g.Recorder Mode. When data are stored to the hard disk the mode is set to Recording. If data is loaded
for off-line visualization it is set to Replay and otherwise to Standard.

The next fields display information about the:

▪ Sampling frequency per channel in Hertz [Hz],
▪ Total Chan. number,
▪ selected Filename,
▪ actual File Size in Megabytes [MB]
▪ actual System Time in the format hh:mm:ss AM/PM.

g.Recorder User Manual 5.16.00 20

Toolbar

The Toolbar is always shown below the Menu and includes functions for file opening, printing, starting
and stopping the data acquisition and video capturing, setting markers and navigating to a certain instant
in the data.

Open…
Load an already recorded file for offline replay

Print Features…
Print selected features

Start Data Viewing

Start displaying data on the screen for visual inspection

➢ Note: No data are stored to disk in this mode

Pause Data Viewing

Pause displaying data in Standard Mode. If the pause
button is pressed in Recording mode, then only the raw
data display in the Data Viewer is stopped. The Video
Viewer and the Feature Viewer are still updated in real-
time.

➢ Note: All data are still stored to the hard disk if this
button is pressed in Recording Mode

Record
Start data acquisition to harddisk. Depending on the
selected options raw data from the amplifiers, the video
and features are saved.

➢ Note: For immediate recordings, no specific

filename or subject information must be provided.
The filename for the recording will be predefined
as a standard file name including the date and
system time.

Stop
Stop data acquisition

Actual recording time in the format hh:mm:ss from the

beginning of the recording to hard disk

Zoom Out and Zoom In into the raw data in the Data
Viewer.
The percentage can also be inserted directly by typing in
the desired zooming level

g.Recorder User Manual 5.16.00 21

 Auto Scale
The data in the Data Viewer are scaled to the actual
maximal absolute value of the displayed data sequence. If
Auto Scale is activated, a small icon is displayed in the
channel information area on the left side of the Data
Viewer window and the data is rescaled for every new
page of data.

Global Maximum Auto Scale

Auto-scale all channels to the global minimum and
maximum value of the displayed data sequence (plus
10%). This scaling is applied only once per click.

Individual Maximum Auto Scale

Auto-scale all the channels individually to their minimum
and maximum value of the displayed data sequence (plus
10%). This scaling is applied only once per click.

Offset Auto Scale

Auto-scale each channel to its individual offset, preserving
its previously configured amplitude range. This scaling is
applied only once per click.

Signal Cropping
Enable or disable signal cropping. If signal cropping is
enabled, the signal will be cropped at its displayed vertical
channel range. If signal cropping is disabled, the data of
the displayed channels may overlap the other channels'
ranges. Examples are given below. Signal cropping is
disabled by default.

Set the number of channels and the number of seconds to

be displayed in the Data Viewer

Off: no video is displayed.

Display: the video is displayed.
Record: the video is displayed and recorded (in recording
mode).

Activate/Deactivate displaying the marker information on

screen.

Click on the icon to insert a specific marker into the Data

Viewer and Feature Viewer.

➢ Note: In the Data Viewer the markers are

presented as vertical color-coded lines from the
top to the bottom of the window including the
names of the markers.
➢ In the Feature Viewer the marker information is
shown as short color-coded line on top of the
individual feature.

g.Recorder User Manual 5.16.00 22

 Jump to a specific point in time in Replay mode

Visualization-only Filters
Customizable digital filters can be applied to the analog
input channels in the data viewer for visualization purposes
only. The filters are not applied to the recorded or analyzed
data.
To apply filters on recorded and analyzed data, use the
configuration dialog of the selected amplifier instead.

g.Recorder User Manual 5.16.00 23

Data Viewer
This window displays the raw data acquired with the g.tec amplifiers. Data are displayed in an overwrite
mode from left to right. The number of channels displayed on the screen is set via the Toolbar to 1. The
actual time is given at the top of the first channel.

+ 185.0 µV

0 µV

- 189.0 µV

The number on the left side of the green box represents the channel number used on the amplification
device. This information is useful if more than one biosignal amplifier is used. Here, channel 4 of the first
amplifier 1 is displayed. The number on the right side of the green box is the logical channel number in
the actual recording setup. In this case the logical channel number is also 4.

The gray box shows the scaling of the channel. The minimal and maximal input amplitude range
displayed on the screen is given by the 2 numbers. The horizontal dotted gridline represents 0 µV. The
minimal and maximal values can be adapted via the menu Settings/Channels.

The light blue box shows the channel name and channel type. The text on the left side gives the chosen
channel name. Here the selected channel name was FZ. The text on the right side shows the selected
channel type (e.g. EEG). The channel name and channel type information can be set via the menu
Settings/Channels.

The zooming level of the Data Viewer as well as the color for the paper, pen and grid can also be defined
via a context menu by clicking with the right mouse button of a specific channel in the Data Viewer.

g.Recorder User Manual 5.16.00 24

Feature Viewer
This window displays the parameters extracted from the raw data displayed in the Data Viewer. Data are
displayed in an overwrite mode from left to right. The features that are computed from the raw data can
be defined in the menu Analysis/Feature Definition…. In this example the feature CFM (cerebral
function monitor) is displayed in the upper panel and the feature HR (heart-rate) is displayed in the lower
panel.

The actual time is given on top of individual feature panels as the time on screen can vary depending on
the specific user settings. The format of the time is hh:mm:ss. The y-axis scaling and units depend on the
specific selected feature. The minimal and maximal values can be adapted via the feature specific context
menu. The y-scaling for the CFM feature is fixed to 0 and 100 µV. The scaling for the HR feature is set to
0 and 200 beats per minute [bpm].

Running time

Name of selected
feature: CFM [µV]

Name of selected
feature: HR [bpm]

g.Recorder User Manual 5.16.00 25

Context Menu Scaling

The scaling values of the Heart Rate feature can be set via a context menu by clicking on the right mouse
button in the feature panel.

The Feature Viewer review mode during data acquisition

The Feature Viewer review mode allows for the inspection of previous epochs of feature signals. If the
time on screen is elapsed, then a menu entry appears in the upper right corner of the Feature Viewer
window.

By clicking on the Show previous output a review panel is displayed.

The Previous Output review panel allows the user to scroll trough past feature signals. The upper panel
area displays the already recorded features and the lower panel area yields more specific information
about the time interval Window, the File name of the actual recording and Subject specific information.

g.Recorder User Manual 5.16.00 26

The content of the panel can be copied to the clipboard for further use by clicking the Copy button, or
directly printed to the default printer by using the Print button. To close the Previous Output window
click on Close.

Note: This review panel is only available during data recording.

g.Recorder User Manual 5.16.00 27

Evoked Potentials Viewer
The Evoked Potentials Viewer displays averaged data frames for each acquired analog input channel.
An evoked potentials plot is created for each acquired analog input channel. The time frame represents a
defined time period, consisting of a pre-trigger period, a post-trigger offset and a post trigger period. The
viewer displays the trigger's occurrence and an averaged time frame for target and non-target evoked
potentials. Significant differences between target and non-target evoked potentials can be calculated and
highlighted.

It is possible to configure the scale settings, to scale the data to the individual minimum/maximum of
each acquired channel or to the global minimum/maximum of all acquired channels.

It is possible to change channel names, signal type, units and sensitivity range in the channel settings
dialog. Channel names can be loaded from montage files.

By default, all plots are arranged in a square matrix. It is possible to change rows columns and
arrangement in the arrangement settings. Topographic arrangement of the plots can be loaded from
montage files.

The color settings allow the user to change the appearance of all elements of the evoked potential plots.

g.Recorder User Manual 5.16.00 28

Load Configuration
Previously saved configurations can be loaded by clicking on the Load Setup… button in the File menu.

g.Recorder User Manual 5.16.00 29

The configuration used in this example is for recording one EEG channel and one ECG channel to
calculate the CFM and Heart Rate features using g.USBamp.

Select the corresponding file CFMECG.xml from

c:\Program Files\gtec\gRecorder\Config

and click Open.

g.Recorder will be initialized with all necessary hardware and software settings.

Previously saved configurations can be loaded by clicking on the Load Setup… button in the File menu.

g.Recorder User Manual 5.16.00 30

For the recordings in this example, the electrodes are connected to a g.USBamp.

The picture above displays the front side of the g.USBamp. The front side is divided into four groups
(A,B,C,D from left to right). Each group consists of four red connectors (1-4, 5-8, 9-12, 13-16) for
connecting biosignal electrodes (EEG, ECG, EMG, etc.), one blue connector for the reference electrode
(R) and one yellow connector for the ground electrode (G).

For EEG measurements, all electrodes for EEG are connected to Group A (first group on the left side of
the g.USBamp). One EEG electrode is connected to channel 1 of Group A (red connector), the reference
electrode to reference R of group A (blue connector) and the ground electrode is connected to ground G
of group A (yellow connector).

g.Recorder User Manual 5.16.00 31

For the ECG measurement, all electrodes for ECG are connected to Group B (second group from left).
One ECG electrode is connected to channel 5 of group B (red connector), the reference electrode to
reference R of group B (blue connector) and the ground electrode is connected to ground G (yellow
connector).

g.Recorder User Manual 5.16.00 32

Recording Information
The Recording dialog opens when the Record button either in the File menu or the task bar is pressed.

g.Recorder User Manual 5.16.00 33

File

A Path for the data file can be entered or the desired path can be chosen by clicking on the Browse
button.

The Filename defines the name of the data file. The default filename is RecordSession_ with date and
time added. When the measurement is started the data and the time are added automatically to the
filename (e.g. RecordSession_2016.11.09_11.36.02.hdf5). The data is stored in the HDF5 file
format. For more information about this format see www.hdfgroup.org or refer to the MATLAB help.

The Record Raw Data checkbox toggles whether the raw data from the amplifier is stored to the HDF5
file or not. For offline processing after measurement it is recommended to record raw data.

Recording Time

IA time limitation for the measurement can be set with the Enable Time Limitation checkbox in the
Recording Time section. After this time, the measurement is stopped automatically.

g.Recorder User Manual 5.16.00 34

Subject

Information about the subject like Last Name(s), First Names(s) and Date of Birth can be entered in the
Subject section. Additional information (e.g. medications) can be added in the Comment section.

Session Data

Enter the Session and Run identifier for your recordings.

After finishing these settings click OK.

Note: Mandatory fields (the keyword mandatory is displayed next to this field) must be filled out correctly.
Otherwise the recording cannot be started.

g.Recorder User Manual 5.16.00 35

Display Settings
From the Settings menu choose Data Viewer... to change the data representation.

The Color Settings can be set in the Data Viewer dialog. The Pen color sets the color of the data
recorded, the Paper color sets the background color and Grid color sets the color of the grid. It is
possible to change the settings of each channel individually in the Individual color settings group, or for
multiple channels at once in the Common color settings group.

In the Grid settings area the grid can be enabled and the number of vertical grid lines can be selected.

The normal time scale of the Data Viewer is the elapsed measurement time. If the Show absolute time
checkbox is checked, then the system time is shown.

g.Recorder User Manual 5.16.00 36

Channel Settings
A specific number, name, sensitivity and channel type can be assigned to every acquired channel. Click
onto Channels… in the Settings menu to open the dialog.

Individual settings

The first column, Device-Ch Nr., shows the device number and also the channel number (e.g. 1-1 for the
first amplifier and channel 1, 2-1 for the second amplifier and channel 1). The second column, Logical
Ch. Nr., shows the logical channel number. If two amplifiers with each 16 channels are used then the
Logical Ch Nr. goes from 1 to 32.

In the Name column a name for the channel can be entered and in the Type column EEG, ECG, EMG,
EOG, ECoG, Resp., TRIG can be selected. With the channel type selection the Sensitivity of the
channel is changed automatically.

The Sensitivity and an Offset of each channel can be entered manually. The Unit can be µV, mV or V.
This Sensitivity affects only the visualization of the raw data.

g.Recorder User Manual 5.16.00 37

Common Settings

The same settings can be applied to multiple channels at once in the Common settings section.

To only apply a Type to a range of channels, select the Start channel and the End channel and the
Type in the upper half and click Apply next to it.

To apply a common sensitivity, an offset and a unit to a specific Type of channels, select the lower
sensitivity (Sens L.), the upper sensitivity (Sens H.), the Offset and the Unit and choose the Type of the
channels you want to apply those settings on, and click Apply.

g.Recorder User Manual 5.16.00 38

Video Camera
When a video camera is connected to the PC, the video images can be displayed and recorded with
g.Recorder. In the menu bar it can be chosen if the video should not be displayed (OFF), just be
displayed but not recorded (Display) or be displayed and recorded (Record).

To see the video images in the main window of g.Recorder, select Video Viewer from the View menu.

The Data Viewer, the Video Viewer and the Feature Viewer can be automatically arranged by selecting
Arrange in the Window menu.

g.Recorder User Manual 5.16.00 39

Start and Stop Recording
When all desired settings are done, the measurement can be started.

To display data in the Data Viewer without saving it, click on the View Data button in the Toolbar or
select Start Data Viewing from the File menu.
Note: This button is also used to start streaming to SD Card with g.MOBIlab+.

To record data to the hard disk on your PC, click the Record button or select Record from the File menu.

To stop data acquisition in Standard mode or pause the data display in the Recording mode, press the
Pause Data Viewing button or select Pause Data Viewing from the File menu.

Note: If the button is pressed in Recording mode, only the visualization of the data on the display is
stopped, but the g.Recorder continues to store data to the HDF5 file.

Click on the Stop button or select Stop from the File menu to stop data acquisition.

g.MOBIlab+ specific functions

The Pause Data Viewing button is the only button activated if a g.MOBIlab+ is streaming to SD Card.

If g.Recorder is used to reconnect to a streaming g.MOBIlab+, only the Start Data Viewing button is
activated.

Note: For g.MOBIlab+, data can either be stored the local hard disk of your PC or streamed to the built-in
SD card.

g.Recorder User Manual 5.16.00 40

Markers
Markers can be used during measurement to highlight certain events. g.Recorder allows the user to
define keyboard markers which (i) indicate an event specific at a certain time point and (ii) region markers
or toggle markers which can be switched on and switched off to mark a longer lasting event.

Click on Marker Definition under the Analysis menu.

to open the following window:

Here, two markers are defined that can be set either by clicking on the marker button in the Toolbar of
g.Recorder or by pressing the keys on the keyboard. Marker e – Event is a Toggle marker, marker m –
Movement is a time marker.

g.Recorder User Manual 5.16.00 41

If e is pressed the signal is marked in the selected marker color until the marker button is pressed again.
If m is pressed then only the event at a certain time point is marked.

The window below shows the visualization of the markers in the Data Viewer:

The set markers for the different events are also indicated by small bars near the top of the individual
features channels in the Feature Viewer:

g.Recorder User Manual 5.16.00 42

Digital Inputs
Devices may provide digital inputs that are sampled synchronously with the raw data samples. Digital
inputs can be acquired and displayed with g.Recorder. A rising or falling edge of an acquired digital input
is represented as a vertical line including a description consisting of trigger number, value and name.

Some types of devices allow the user to choose if each of those trigger channels should be treated
individually or if several trigger channels should be combined.

Individual Triggers
By default, trigger channels selected for acquisition are treated individually. Depending on their
configuration, each occurrence of such a trigger channel is represented as a separate event with a value
of HIGH (H) for rising edges or LOW (L) for falling edges.

Combined Triggers
Combined triggers are supported by g.USBamp and g.HIamp devices only. In this mode, all trigger
channels of a device are represented by the same event for that device and the value is a binary coded
decimal made up of the current high or low values of the individual trigger channels. The triggers are
represented as vertical lines including a description consisting of device's serial number, combined trigger
tag, event code and name.

This enables reception and interpretation of binary coded trigger values sent via the parallel port.
g.Recorder supports external stimulation software like Presentation® (Neurobehavioral Systems, Inc.,
www.neurobs.com) and E-Prime® (Psychology Software Tools, Inc., www.pstnet.com) by acquiring event
codes sent via parallel port.

g.Recorder User Manual 5.16.00 43

Note: E-Prime® and Presentation® are trademarks by their respective owners.

g.Recorder User Manual 5.16.00 44

Load Electrode Montage
XML montage files created with g.MONcreator (g.tec medical engineering GmbH, Austria) can be loaded
to assign predefined names and the topographic arrangement of an electrode cap to the current
configuration.

Montage files can be loaded by selecting Load Electrode Montage… in the File menu.

The Data Viewer assigns channel names to the acquired analog channels. The Evoked Potentials
Viewer, if enabled, arranges the evoked potential plots in a topographic way according to the 2D
electrode positions in the file.

g.Recorder User Manual 5.16.00 45

Load, Find, Convert and Replay Recorded Files
Load, Find and Replay HDF5 files

A recorded data file in HDF5 format can be loaded and reviewed with g.Recorder.

In the File menu select Open...

Then select the data file you want to load into g.Recorder. The default path of the recorded files is

My Documents/gRecorder

g.Recorder User Manual 5.16.00 46

Select file RecordSession_2016.11.09_10.10.28.hdf5 and press Open.

g.Recorder User Manual 5.16.00 47

If you want to find a specific file from the database, please select Find… in the File menu.

This displays all HDF data files found in your specific working directory.

g.Recorder User Manual 5.16.00 48

The Search Directory of data files can be set in the Path: field. Use the Browse button to find the
desired directory. If the Include Subfolders option is enabled, the data files found in the selected path
including all subdirectories are listed.

Define Datasets enables optionally searching for data sets including Last Name and First Name and if
selected the Date of Birth of a subject. Results are displayed immediately after typing in the first letter.
Found Datasets yields information about the search request.

The desired data set can be selected by highlighting the data set. Double clicking or selecting the OK
button loads the data set for review. Additional short information is given for the data set including the
Last name, first name, Date of Birth, Recording data, Recording length, Filename and if a video
information is available. Data sets can be sorted by clicking on one of the row headers e.g. on the Video
entry.

The entire table can be copied to the clipboard for further use by clicking the Copy Table button.

g.Recorder User Manual 5.16.00 49

g.Recorder opens the acquired data for off-line visualization. The Data Viewer shows the recorded EEG
data on channel 1 and the acquired ECG data on channel 2. The Feature Viewer shows the calculated
CFM and HR features.

The recorded measurement’s information is displayed in the Status Bar.

The Mode is Replay, the Sampling frequency is 256 Hz, the number of recorded channels (Total Chan.)
is 16. The File Name is Record_Session_2016.02.18_10.07.09.hdf and the File Size is 0.413
megabytes.

You can use the scroll bars on the bottom of a window or the orange vertical position marker in any of the
g.Recorder windows to move to an arbitrary position in the file.

To review data on-line from the selected position, click on the Start Data Viewing button.

g.Recorder User Manual 5.16.00 50

Synchronous and asynchronous events are loaded and displayed on the right-hand side of the Data
Viewer in Replay mode. The navigator on the right-hand side allows the user to jump to a specific event
by selecting it in the list. The ruler is set to the selected signal's time of occurrence and the current page
is updated. The event list features the time of occurrence, signal name, signal description, and selected
color.

Visualization Filters can be applied to the recorded analog signals in Replay mode. A progress bar is
displayed for filtering and rendering a large amount of data.

g.Recorder User Manual 5.16.00 51

To view the file information, select File Info… from the File menu.

This opens the File Info window yielding information about the data set. To view the file information use
the Select Section pull down menu (the list contains Raw Data, DeviceInfo, Session Description,
Subject Description, Marker Description and the recorded features).

g.Recorder User Manual 5.16.00 52

Select Raw Data to show the settings for each channel:

Click OK to close the dialog.

g.Recorder User Manual 5.16.00 53

Convert g.MOBIlab+ BIN files to HDF5 format
g.Recorder contains a tool to import g.MOBIlab+ data files stored on the built-in SD Card of g.MOBIlab+.
Data are converted to the g.Recorder file format HDF5.

In the File menu, click Open…

In the Files of type section of the Open dialog select g.MOBIlab+ Files (*.BIN) files and browse to the
folder containing the file to convert. Select the desired file and click Open.

The Save HDF5 File As dialog will open, where the path for the converted HDF5 file can be set.

Click OK to convert and display the file.

g.Recorder User Manual 5.16.00 54

Print Recorded Files
The recorded features and the recording information can be printed by selecting Print Features… from
the File menu.

g.Recorder User Manual 5.16.00 55

In the Select Features to Print dialog, you can choose the features to be printed.

Scale

The Scale of the printed feature can either be in cm/h (centimeters per hour) or min/page (minutes per
page). When selecting the setting 6 cm/h a dataset of 3 hours would need a total space of 18 cm on the
paper. If the same 3-hour data set is printed with the selection of 60 min/page then 3 pages would be
printed.

The time scale in the printed document can be set with the checkbox Relative Time Annotation. The
time is given in absolute format (e.g. 17:05:01) or relative to the measurement time (e.g. 00:05:14).

Select the Print Document Abstract to print the file and subject information.

Feature Selection

Under Feature Selection select the features that should be printed.

Click Next to go to the Print dialog, select a printer and print the file.

g.Recorder User Manual 5.16.00 56

Closing the review mode in g.Recorder
To return from Replay mode to Recording mode select the Close button from the File menu.

g.Recorder User Manual 5.16.00 57

Closing g.Recorder
In the File menu select Exit or click on the cross button in the top right corner of g.Recorder to close the
application.

Note: If you are in Replay mode you must close the file first with the Close function in the File menu
before you can exit g.Recorder.

g.Recorder User Manual 5.16.00 58

g.USBamp Specific Features
Impedance Measurement with g.USBamp and g.Recorder

The impedance of electrodes connected to a g.USBamp can be measured in g.Recorder. To start this
tool, click on the Impedance Measurement… button in the Tools menu.

This opens the dialog shown below.

Select the channels for impedance checking individually by clicking on the boxes next to the channel
numbers and click Start. The channel coloring indicates the impedance of the connected electrode.
Optimal values (e.g. values below 5 kilo-ohm for EEG recordings) are color-code green.
Acceptable impedance values are in the range of up to 20 kilo-ohm (color code yellow or red). Non-
connected channels or electrodes with impedance values of more than 20 kilo-ohm are color coded blue.
You can also click on the Select All button to include all electrodes for impedance checking or deselect
the electrodes pressing the Select None button.

In order to accelerate the impedance check, you can check the Measure above green checkbox. This
will only check impedances on electrodes with impedance values greater than 5 kilo-ohm.

g.Recorder User Manual 5.16.00 59

The figure below shows good impedance values for channels 1 and 5.

Note: For EEG measurements the impedance should be below 10 kilo-ohm for optimal recording quality.

To exit from the Impedance Measurement dialog click on the Close button.

Note: The impedance of electrodes connected to channels 1-16 and the reference channels are
measured against the ground G of each group. To measure the impedance of all 16 channels and 4
references against only one ground connect the ground electrode to ground G of group D.

Calibration of g.USBamp with g.Recorder

g.Recorder has a built-in function to calibrate g.USBamps.

Select Calibration… from the Tools menu.

g.Recorder User Manual 5.16.00 60

This opens the g.USBamp Calibration dialog. Click on the Calibrate Amplifier button to measure the
offset and the gain of each channel. The actual calibration values are then visualized for each channel.

Press the Apply button to transmit the settings to the g.USBamp and to close the dialog.

g.Recorder User Manual 5.16.00 61

g.HIamp Specific Features
Impedance Measurement with g.HIamp and g.Recorder

The impedance of electrodes connected to a g.HIamp can be measured in g.Recorder. To start this tool,
click on the Impedance Measurement… button in the Tools menu.

This opens the dialog shown below.

Select the type of electrode connector boxes that are currently connected to each of the four groups of
the g.HIamp in the Electrode Types area. Either passive or active electrode connector boxes can be
used. All groups must use the same type of electrodes even if no box is connected to a specific group. At
least channel 1 (Group A) and the ground electrode must be connected.

IMPORTANT: If an active electrode box is connected to group A, a special electrode has to be used at
channel 1. Please see the documentation of the 64-channel active electrode connector box for details on
impedance measurement.

Select or deselect the channels to use for impedance measurement by clicking on the appropriate
channel number. Deselected channels get a dark gray background while selected channels have a white
background.

g.Recorder User Manual 5.16.00 62

Click Start to start impedance measurement. Impedance measurement is performed periodically for all
channels at once and lasts a few seconds for each run.

The channel coloring indicates the impedance of the connected electrode. Channels with passive
electrodes get assigned one of the colors listed in the Passive Electrodes box. Channels with active
electrodes get assigned one of the colors listed in the Active Electrodes box.

Optimal values e.g. for EEG recordings with passive electrodes should be below 5 kilo-ohm (color-code
light green). Acceptable impedance values are in the range of up to 20 kilo-ohm (color code light yellow or
light blue). Bad impedance values above 20 kilo-ohm are color coded light red. Channels whose
impedance couldn’t be measured properly are color coded black.

Optimal values e.g. for EEG recordings with active electrodes should be below 30 kilo-ohm (color code
green). Acceptable impedance values are in the range of up to 100 kilo-ohm (color code yellow or blue).
Bad impedance values above 100 kilo-ohm are color coded red. Channels whose impedance couldn’t be
measured properly are color coded black.

Channel 1 and the ground electrode are used as the reference for impedance measurement of all other
channels. No impedance can be measured for those channels. Hence, channel 1 is always grayed and
no impedance value will be assigned. However, if the reference signal measured on channel 1 is not valid
(which might occur when the skin contact is too poor, or when no electrode is connected on that channel,
or when artifacts mess up the measured signal on that channel), no impedance value can be calculated
and color code black will be assigned to all other channels.

Otherwise, if the reference signal measured on a specific channel is not valid (which might occur when
the skin contact is too poor, or when no electrode is connected on that channel, or when artifacts mess up
the measured signal on that channel), no impedance value can be calculated and color code black will be
assigned to that specific channel.

Click Stop to stop impedance measurement (even if impedance measurement has aborted with a
connection error, for example if the device was disconnected during measurement) and close the dialog
by clicking Close.

If Acoustic feedback is checked, a short beep is produced on the PC speaker when the impedance of
any of the electrodes changes from red to any better impedance value. The better the impedance value
the electrode changes to, the higher the frequency of the beep. If the impedance of any electrode
changes to red, a long beep sounds. To turn off acoustic feedback, uncheck the Acoustic feedback
checkbox.

Check Show channel names if the names of the channels should be displayed instead of their numbers.
This only works for channels that got a name assigned before in the Channel Settings dialog. Nothing
additional is displayed for channels that got no name assigned that way.

Calibration of g.HIamp with g.Recorder

g.Recorder has a built-in function to calibrate a g.HIamp device. Select Calibration… from the Tools
menu.

g.Recorder User Manual 5.16.00 63

This opens the g.HIamp calibration dialog. To calculate new calibration values for the device, ensure that
the calibration set is applied onto the amplifier at first. See the manual of the calibration set for detailed
instructions on how to do this. Then click the Calibrate Amplifier button to measure offset and gain of
each channel. Confirm the following dialog reminding you to apply the calibration set by clicking OK.

Calculation of new calibration values lasts about 10 seconds. A dialog will inform you after calculation has
been completed. The actual calibration values are then visualized for each channel, but not applied yet.

If at least one channel could not be calibrate due to broken channels or a broken calibration set, for
example, a dialog will inform you about the involved channels and their calibration value entries are
displayed as NaN (“not a number”).

To restore the initial factory calibration values, click Restore Factory Settings.

Press the Apply button to transmit the newly calculated or restored factory calibration values to the
g.HIamp and apply them on the device. Press the Restore button to restore the old values on the
amplifier. To edit the calibration values manually, double-click the desired cell and enter your value for
scaling and offset (the settings will actually be transmitted and applied after the Apply button is pressed).

For channels that received NaN values as calibration result, 1.0 will be set for scaling and 0.0 for offset on
pressing the Apply button.

g.Recorder User Manual 5.16.00 64

g.Nautilus Specific Features
Impedance Measurement with g.Nautilus and g.Recorder

The impedance of electrodes connected to a g.HIamp can be measured in g.Recorder. To start this tool,
click on the Impedance Measurement… button in the Tools menu.

This opens the dialog shown below.

Select or deselect the channels to use for impedance measurement by clicking on the appropriate
channel number. Deselected channels have a dark gray background, while selected channels have a
white background.

Click Start to start impedance measurement. Impedance measurement is performed periodically for all
channels simultaneously, and lasts a few seconds for each run.

The channel coloring indicates the impedance of the connected electrode. The color code for the
impedance measurement is listed in the Active Electrodes box.

Optimal values e.g. for EEG recordings with active electrodes should be below 30 kilo-ohm (color code
green). Acceptable impedance values are in the range of up to 100 kilo-ohm (color code yellow or blue).

g.Recorder User Manual 5.16.00 65

Bad impedance values above 100 kilo-ohm are color coded red. Channels whose impedance couldn’t be
measured properly are color coded black.

The Cz electrode and the ground electrode are used as the reference for impedance measurement of all
other channels. If the reference signal measured on channel Cz is not valid (which might occur when the
skin contact is too poor, or when no electrode is connected on that channel, or when artifacts affect the
measured signal on that channel), no impedance value can be calculated and color code black will be
assigned to all other channels.

Otherwise, if the reference signal measured on a specific channel is not valid (which might occur when
the skin contact is too poor, or when no electrode is connected on that channel, or when artifacts affect
the measured signal on that channel), no impedance value can be calculated and color code black will be
assigned to that specific channel.

Click Stop to stop impedance measurement (even if impedance measurement has aborted with a
connection error, for example if the device was disconnected during measurement) and close the dialog
by clicking Close.

If Acoustic feedback is checked, the PC speaker presents a short beep when the impedance of any of
the electrodes changes from red to any better impedance value. The greater the improvement in the
impedance value, the higher the frequency of the beep. If the impedance of any electrode changes to red,
a long beep sounds. To turn off acoustic feedback, uncheck the Acoustic feedback checkbox.

Check Show channel names if the names of the channels should be displayed instead of their numbers.
This only works for channels that got a name assigned before in the Channel Settings dialog. Nothing
additional is displayed for channels that got no name assigned that way.

Check Show impedance values in kΩ to display the measured impedance in kilo-ohm. If the measured
impedance value is very low, LOW is displayed instead of a value in kilo-ohm. If the impedance value is
very high, HIGH is displayed instead of a value in kilo-ohm.

Calibration of g.Nautilus with g.Recorder

g.Recorder has a built-in function to calibrate a g.Nautilus device. Select Calibration… from the Tools
menu.

This opens the g.Nautilus calibration dialog. Click the Calibrate Amplifier button to measure offset and
gain of each channel. Confirm the following dialog reminding you to apply the calibration set by clicking
OK.

A dialog will inform you after calculation has been completed. The actual calibration values are then
visualized for each channel, but not applied yet.

g.Recorder User Manual 5.16.00 66

g.Recorder User Manual 5.16.00 67
Running g.Recorder in Administrator Mode
The Administrator Mode allows the user to configure a g.HIamp, g.USBamp, g.MOBIlab or g.Nautilus
amplifier and add and configure the different feature extraction methods of g.Recorder.

➢ Note: This mode requires an administrator password for the software.

g.Recorder User Manual 5.16.00 68

Activate Administrator Mode
To change from User Mode into the Administrator Mode click on Administrator Mode under the Mode
menu.

Note: Per default no Administrator Password is set.

To activate the Administrator mode just click OK in the Administrator Authentication dialog. If a
password is set, enter the password and click OK.

To change the password, click on Change Password and enter the Old Password. Then, press the
Enter key and enter the New Password, then enter the password again in the Retype new Password
field and click OK.

g.Recorder User Manual 5.16.00 69

Select and Configure Hardware
g.HIamp
In the Settings menu, select Select Hardware…

The Select Hardware dialog opens:

Select the desired g.HIamp device that should be used for measurement from Available Hardware and
click on the arrow button. This g.HIamp and its serial number are displayed in the Selected Hardware
box.

Click OK to finish hardware selection.

g.Recorder User Manual 5.16.00 70

To configure the selected g.HIamp device, click on g.HIamp… in the Settings menu.

The configuration dialog opens with the amplifier’s serial number (here e.g. HA-2016.02.01):

g.Recorder User Manual 5.16.00 71

AMPLIFIER SETTINGS
Sample Rate [Hz] specify the sampling frequency of the g.HIamp in Hz.
Common Reference specify one of the device’s channels as the common reference channel. This
is a quick way to set the selected channel as a bipolar channel for all other
channels of the device. Existing settings for bipolar channels will be
overwritten.

OPTIONS
Master set the amplifier to master mode.
Enable Trigger indicates if the digital trigger input line is acquired as well. This checkbox will
be enabled automatically if at least one trigger line is selected to acquire (see
the digital IN settings section for further details). If this checkbox gets disabled
by the user, the trigger input line will not be acquired.
Enable Counter a sample counter is applied on the first acquired channel, which overruns at
1000000.
Enable Hold enable/disable the signal hold function.

TEST MODE
Activate Test Signal enable/disable the internal test signal generator, which generates a test signal
using the specified settings on the GND (ground) connector.
Wave Shape specify the wave shape of the test signal.
Frequency [Hz] specify the frequency of the test signal.
Amplitude [µV] specify the amplitude of the test signal in microvolts.
Offset [µV] specify the offset of the test signal in microvolts.

CHANNEL SETTINGS
Bipolar perform a bipolar derivation between 2 input channels.
Bandpass perform a digital bandpass filtering of the input channels.
Notch perform a bandstop filtering to suppress the power line frequency of 50 Hz or
60 Hz.

Perform the following steps to configure the highlighted channels:

1. Highlight the channels in the list box that should be edited. Use the Ctrl key or the Shift key to
highlight multiple channels. To select all channels, use Ctrl+A. To highlight all channels of one
group, click the group header. Highlighted channels are represented with an orange background
color, as illustrated for channel 3.

2. Check or uncheck the checkbox of one of the selected channels in the Acquire column to include
the highlighted channels in data acquisition or exclude them.

3. If no common reference has been set before, or you want to change the reference/bipolar
channel for a specific channel, select the desired bipolar channel from the Bipolar list and press
the corresponding Apply to highlighted button right below.

g.Recorder User Manual 5.16.00 72

 4. Select a bandpass filter from the Bandpass list and press the corresponding Apply to
highlighted button right below.

5. Select a notch filter from the Notch list and press the corresponding Apply to highlighted button
right below.

If no channel is highlighted when one of the Apply to highlighted buttons is clicked, the system instead
informs the user of this error and the settings do not change.

Click OK to finish the configuration of the g.HIamp and apply it to the device.

g.Recorder User Manual 5.16.00 73

Digital IN for g.HIamp

In the Settings menu, click on g.HIamp Digital IN… to open the configuration dialog for the digital I/O
settings.

The Trigger inputs are sampled synchronously with the analog input channels.

g.Recorder User Manual 5.16.00 74

Check the box of the desired channels, enter a Description, select a color by clicking on the Color
button (Color Sel.), and define the edge (Edge Detection).

Confirm the settings and close the dialog with OK.

If the event occurs, a marker is generated and visualized with the biosignal data.

If Combined Triggers are selected, all individual trigger channels are enabled and the individual channel
selection becomes disabled. Combined triggers are always configured to detect rising edges. It is
possible to change the Color and Description for combined triggers. The displayed marker name and
color for a combined trigger are always the same. The marker's value will be the binary coded decimal
made up of the current HIGH and LOW values of all individual trigger channels with trigger channel 1 as
least significant bit and trigger channel 16 as most significant bit.

g.Recorder User Manual 5.16.00 75

g.USBamp version 2.0 and version 3.0

In the Settings menu, select Select Hardware…

The Select Hardware dialog opens:

From Available Hardware, select the g.USBamp device that should be used for the measurements and
click on the arrow button, as shown in the figure above. This g.USBamp with the serial number is now
displayed in the Selected Hardware box. Repeat these steps If multiple g.USBamps are connected to
the PC.

Click OK to finish hardware selection.

g.Recorder User Manual 5.16.00 76

To configure the g.USBamp, click on g.USBamp… in the Settings menu.

The configuration window opens with the amplifier serial number (here e.g. UA-2007.10.15):

AMPLIFIER SETTINGS

Common Ground check the ground that should be connected to common ground

Common Reference check the reference that should be connected to common reference

Channel Selection check the analog input channels that should be acquired

Sampling Rate [Hz] specify the sampling frequency of the g.USBamp in Hz

Options

g.Recorder User Manual 5.16.00 77

Master set the amplifier to master mode if multiple units are used

Shortcut enable the shortcut input

Mode

Measure amplify the inputs and send the data to the PC

Counter A counter is applied to channel 16

Test Signal apply internal test signal to all inputs

NOTE: The test signal works for sampling rates equal or below 600 Hz

Analog Output generate a Sine-, Square-, Sawtooth- or Noise-signal as test signal

Amplitude specify the amplitude of the test signal (max: 244 mV)

Offset specify the offset of the test signal

Frequency specify the frequency of the test signal

CHANNEL SETTINGS

Bipolar perform a bipolar derivation between 2 input channels

Bandpass perform a digital bandpass filtering of the input channels

Notch perform a bandstop filtering to suppress the power line frequency of 50 Hz or

60 Hz

Perform the following steps to configure the selected channels:

1. Highlight the channels in the listbox that should be edited. Use the Ctrl key or the Shift key to
highlight multiple input channels.

2. Select the Bandpass filter HP: 0.5 / LP: 30 and press the Apply button to assign the bandpass to
the highlighted channel(s). The selection is shown in the listbox.

3. Select the 50 Hz Notch filter to suppress the power line interference at 50 Hz and then press the
Apply button

4. To perform a bipolar derivation between channels 1 and 2, select the first channel in the listbox.
Then select channel 2 under Bipolar and press the Apply button. The settings appear in the
listbox. This configuration subtracts channel 2 from channel 1 and the bipolar derivation will be
visible on channel 1.

NOTE: Select 0 under Bipolar and assign it to the channel if no bipolar derivation should be
performed

Finish the configuration of the g.USBamp by clicking the OK button.

g.Recorder User Manual 5.16.00 78

Digital IO for g.USBamp version 2.0

The serial number for a g.USBamp 2.0 starts with UA-xxxx.xx.xx

g.USBamp 2.0 has 3 digital inputs and 2 digital outputs. In the Settings menu click on g.USBamp Digital
IO… to open the dialog.

The Trigger input is sampled together with the analog input channels and therefore gives a synchronous
response. The inputs and outputs D1, D2, D3 and D4 are sampled asynchronously.

Check the box of the desired channels, enter a Description, select a color (Color Sel.) and define the
edge (Edge Detection).

Then close the dialog with OK.

If the event occurs, a marker is generated and visualized with the biosignal data.

If Combined Triggers are selected, all individual trigger channels are enabled and the individual channel
selection becomes disabled. Combined triggers are always configured to detect rising edges. It is
possible to change the Color and Description for combined triggers. The displayed marker name and
color for a combined trigger are always the same. The marker's value will be the binary coded decimal
made up of the current HIGH and LOW values of all individual trigger channels with trigger channel 1 as
the only bit in that value.

NOTE: The Trigger input must be used if very accurate timing is needed.

g.Recorder User Manual 5.16.00 79

Digital IO for g.USBamp version 3.0

The serial number for a g.USBamp 3.0 starts with UB-xxxx.xx.xx

g.USBamp 3.0 has 8 digital inputs and 4 digital outputs. In the Settings menu, click on g.USBamp
Digital IO… to open the dialog.

The trigger inputs Trigger 1 to Trigger 8 are sampled synchronously with the analog input channels. The
outputs Out 1 to Out 4 are sampled asynchronously.

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Check the box of the desired channels, enter a Description, select a color (Color Sel.) and define the
edge (Edge Detection).

Then close the dialog with OK.

If the corresponding trigger event occurs, a marker is generated and visualized along with the biosignal
data.

If Combined Triggers are selected, all individual trigger channels are enabled and the individual channel
selection becomes disabled. Combined triggers are always configured to detect rising edges. It is
possible to change the Color and Description for combined triggers. The displayed marker name and
color for a combined trigger are always the same. The marker's value will be the binary coded decimal
made up of the current HIGH and LOW values of all individual trigger channels with trigger channel 1 as
least significant bit and trigger channel 8 as most significant bit.

NOTE: A very accurate timing is obtained for all input channels.

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g.MOBIlab+

In the Settings menu select Select Hardware…

The Select Hardware dialog opens:

From Available Hardware, select the g.MOBIlab+ that should be used for the measurements and click
on the arrow button as shown in the figure above. Now this g.MOBIlab+ with the serial number and the
COM port number is displayed in the Selected Hardware box. The COM port of your g.MOBIlab+ can be
found in Bluetooth Devices in the Control Panel.

Click OK to finish hardware selection.

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To configure g.MOBIlab+ click on the g.MOBIlab+… button in the Settings menu.

The configuration window opens:

Info

In this section, the COM port where g.MOBIlab+ is connected and the serial number of g.MOBIlab+ are
shown.

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Analog Channels

The channels to be recorded can be selected in the Analog Channels section. The Sensitivity, the
highpass HP, the lowpass LP and the Polarity are displayed. Additionally a 50 or 60 Hz Notch filter can
be applied.

Sampling Frequency

The Sampling Frequency is 256 Hz.

SD card

If a SD Card is inserted into g.MOBIlab+, then the SD card status is displayed in the SD Card section
including the space left on the SD Card.

Operation Mode

The checkboxes Generate test signal and Enable streaming are located in the Operation Mode
section on the bottom of the dialog.

With the Generate test signal checkbox selected, g.MOBIlab+ will output a test signal consisting of
ramps with different slopes on the eight analog channels and the digital channels will toggle at different
rates. This function is implemented to test the connection between g.MOBIlab+ and PC or laptop. It is
recommended that the markers are turned off for this function.

The Enable streaming to SD card checkbox is only enabled if a SD Card is inserted into g.MOBIlab+. If
the checkbox is selected then it is possible to disconnect g.MOBIlab+ from the g.Recorder environment
and the device will continue to stream data to the built-in SD Card. If a connected g.MOBIlab+ is already
streaming data then this Status is also displayed in the Operation Mode section.

g.MOBIlab+ provides eight digital channels. To configure the digital inputs and outputs click on the
g.MOBIlab+ Digital IO… button in the Settings menu.

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DIO1 to DIO4 can be configured as digital inputs or outputs. DI1 to DI4 are digital inputs. Set the Edge
Detection to either detect only Falling or Rising edges or to detect both, Rising+Falling.

Perform the settings as shown in the figure above and close the dialog with OK. Then the following
controls will be visible in g.Recorder:

Click on the buttons to set the markers. All markers are stored together with the biosignal data. The digital
inputs and outputs are sampled together with the biosignal data.

If Enable streaming in the g.MOBIlab+ dialog is selected and the data acquisition is started by clicking
on the Display button the g.MOBIlab+ Start Streaming to SD Card dialog will appear.
If g.MOBIlab+ is already streaming, the Status in the Device section will be set to Streaming. The SD
Card section will be disabled.

The Start Streaming to SD Card dialog asks the user to provide a Filename for the data recorded to the
SD card.

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The default filename is SESSION, characters entered are set to uppercase automatically. Characters not
allowed for a filename are <, >, \, /, :, *, |, ? and ”. Numbers can also be used.

The Space left on SD Card in MB is also displayed

To confirm streaming to SD card click Yes. Then data are displayed in g.Recorder for control purposes
and data are streamed to the built-in SD card on g.MOBIlab+
Click No to simply display data in g.Recorder.

When the data acquisition is stopped, then g.MOBIlab+ Stop Streaming To SD card dialog will appear.
To stop the data transfer to the PC and data acquisition to the SD Card in g.MOBIlab+ click Yes. To
continue streaming data to the SD Card click No.

If g.MOBIlab+ is already streaming data to the SD card, then you can reconnect the device to
g.Recorder. An information dialog will appear. Click OK to display data again from g.MOBIlab+ in
g.Recorder.

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g.Nautilus

In the Settings menu, select Select Hardware…

The Select Hardware dialog opens:

Select the g.Nautilus that should be used for the measurements from Available Hardware and click on
the arrow button as shown in the figure above. Now this g.Nautilus with the serial is displayed in the
Selected Hardware box.

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If the g.NEEDaccess Server is not running, g.Nautilus devices cannot be used. An error message will be
shown. The installation and GDS service status should be checked, if this error message appears.

Click OK to finish hardware selection.

To configure the g.Nautilus, select g.Nautilus… from the Settings menu.

The configuration window opens with the amplifier serial number:

AMPLIFIER SETTINGS
Input Source specify the input source for data acquisition.
Electrode: record EEG data
Shortcut: record with shortcut of inputs
Testsignal: enables the internal test signal generator, which generates a
square wave test signal on each channel.
Sample Rate specify the sampling frequency in Hz.

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Network Channel Set the network channel used for data transmission.
Noise Reduction enable noise reduction using DRL (driven-right leg) algorithm of activated
channels.
CAR enable common average reference of activated channels (see column CAR).
Acceleration Data if enabled, the measured acceleration in x, y, and z directions in the range of
± 6 g come as three additional channels after the analog channels.
Counter if enabled, a sample counter comes as an additional channel after the
acceleration data channels.
Link Quality if enabled, wireless link quality in percent comes as an additional channel after
the counter channel.
Battery Level if enabled, battery level (state of charge) in percent comes as an additional
channel after the link quality channel.
Digital Inputs indicates if the digital trigger input line is acquired as well. This checkbox will
be enabled automatically if at least one trigger channel is selected to be
acquired (see the digital IN settings section for further details). Setting or
clearing this checkbox by the user has no effect.
if enabled, the digital input channels come encoded in a single additional
channel after the battery level channel.
Validation Indicator if enabled, the validation indicator indicating successful wireless transmission
of a sample (1 for valid, 0 for invalid) comes as an additional channel after the
digital inputs channel.

Channel SETTINGS
Sensitivity set channel sensitivity of analog input channels.
Bipolar perform a bipolar derivation between 2 input channels.
Bandpass perform a digital bandpass filtering of the input channels.
Notch perform a bandstop filtering to suppress the power line frequency of 50 Hz or
60 Hz.
CAR select channels for common average reference calculation (CAR checkbox
must be enabled to active the filter).
Noise Reduction select the channels that should be used for calculating the DRL signal for
noise reduction (Noise reduction checkbox must be enabled to active the DRL
function).

Perform the following steps to configure the highlighted channels:

1. Highlight the channels in the list box that should be edited. Use the Ctrl key or the Shift key to
highlight multiple channels. To select all channels, use Ctrl+A. To highlight all channels of one
group, click the group header. Highlighted channels are represented with an orange background
color, as illustrated for channel 3.

2. Check or uncheck the checkbox of one of the selected channels in the Acquire column to include
the highlighted channels in data acquisition or exclude them.

3. If you want to change the reference/bipolar channel for a specific channel, select the desired
bipolar channel from the Bipolar list and press the corresponding Apply to highlighted button
right below.

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 4. Select a bandpass filter from the Bandpass list and press the corresponding Apply to
highlighted button right below.

5. Select a notch filter from the Notch list and press the corresponding Apply to highlighted button
right below.

6. If the CAR checkbox is checked and you want to include the highlighted channels in CAR
calculation, select Yes from the CAR list and press the corresponding Apply to highlighted
button right below.

7. If the Noise reduction checkbox is enabled and you want to consider the highlighted channels
for noise reduction, select Yes from the Use for Noise Reduction list and press the
corresponding Apply to highlighted button right below.

If no channel is highlighted when one of the Apply to highlighted buttons is clicked, the system instead
informs the user of this error and the settings do not change.

Click OK to finish the configuration of the g.HIamp and apply it to the device.

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Digital IN for g.Nautilus
The serial number for a g.Nautilus starts with NB-xxxx.xx.xx

g.Nautilus has 8 digital inputs. In the Settings menu, click on g.Nautilus Digital IN… to open the dialog.

The trigger inputs Trigger 1 to Trigger 8 are sampled synchronously with the analog input channels.

Check the box of the desired channels, enter a Description, select a color (Color Sel.) and define the
edge (Edge Detection).

Then close the dialog with OK.

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If the corresponding trigger event occurs, a marker is generated and visualized along with the biosignal
data.

If Combined Triggers are selected, all individual trigger channels are enabled and the individual channel
selection becomes disabled. Combined triggers are always configured to detect rising edges. It is
possible to change the Color and Description for combined triggers. The displayed marker name and
color for a combined trigger are always the same. The marker's value will be the binary coded decimal
made up of the current HIGH and LOW values of all individual trigger channels with trigger channel 1 as
least significant bit and trigger channel 8 as most significant bit.

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DAQ Simulator

In the Settings menu, select Select Hardware…

The Select Hardware dialog opens:

Select Serial Number 1 from the Available Hardware list and click on the arrow button to add it to the
Selected Hardware list. If more than 16 channels should be simulated, add as many DAQ Simulators as
needed.

Click OK to close the dialog.

To configure the DAQ Simulator, select DAQ Simulator from the Settings… menu.

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The configuration window opens with the simulator serial number (e.g. 1):

Sampling Rate [Hz] specify the sampling frequency of the DAQ Simulator in Hz

Signal Frequency [Hz] specify the frequency of the test signal

Amplitude [µV] specify the amplitude of the test signal

Time Interval [ms] set the interval between the imports of the samples. (e.g. set the Timer
Interval to 50 ms at a sampling rate of 1 kHz then every 50 ms 50 samples
are drawn)

DC Offset [µV] specify the offset of the test signal

Channel Selection select the channels to be recorded

If multiple simulators are configured use the Apply to all Amplifiers button to perform the settings for all
amplifiers.

Note: data in the DAQ Simulator is not sampled equidistantly!

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Feature Definition
g.Recorder allows the user to calculate in real-time specific features which are shown in the Feature
Viewer. g.Recorder supports the Cerebral Function Monitor (CFM) parameter, the Heart Rate (HR) and
the Compressed Spectral Array (CSA).

Warning: High sampling rates, many channels or extensive feature calculation can overload the PC's
hardware resources, resulting in data loss. This might occur immediately or even after some time after
starting acquisition. Please plan feature calculation meaningfully and carefully.

Select Feature Definition… from the Analysis menu

In the Feature Definition dialog select the Cerebral Function Monitor (CFM)

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Then select the EEG Channel that is used to calculate the feature and add the feature with the arrow
button.

The channel number and the selected feature are displayed on the right side.

Calculate the HR from the ECG channel 5 and the CSA also from EEG channel 1.

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Configure CFM

To configure the CFM feature select it and click on the Advanced button. This opens the CFM
Configuration dialog below.

Filter Band

Lowest Frequency [Hz] – select the lower cutoff frequency for the CFM calculation
Highest Frequency [Hz] – select the upper cutoff frequency for the CFM calculation

Classification

Classify CFM Pattern – check to automatically classify the CFM signal

Percentile [%] – the percentile specifies the lower and upper signal amplitude border for the
segmentation
Epoch Duration [min] – specify the segment size in minutes
Pattern Definition – specify the segmentation rules

Display

Time on Screen [min] – enter the minutes shown on one page in the Feature Viewer

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Press on the Pattern Definition… button to open the following dialog:

Then enter a Name, the Lower level, the Upper level and define a Color for the specific pattern.

Click the Add button to add the pattern to the list. With Remove, a selected pattern can be removed from
the list. With the Apply changes button, the settings for a selected pattern in the list can be applied.

The figure above shows the standard classification used for neonatal recordings.

Close the dialog with the OK button.

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Configure Heart Rate

Select the HR feature and click on the Advanced button to open the following dialog:

QRS Complex Classification

Base HR [bpm] - base heart rate in beats per minute

Maximum HR [bpm] - maximum heart rate in beats per minute
Minimum HR [bpm] - minimum heart rate in beats per minute
Maximum RR Increase [%] - maximum allowed increase of interval between two QRS complexes in
percent
Maximum RR Decrease [%] - maximum allowed decrease of interval between two QRS complexes

General

Calculation Interval [min] – specify the interval that is used to calculate the HR
Time on Screen [min] - enter the minutes shown on one page in the Feature Viewer
Show Digital Display – if selected, the actual information for heart rate or heart rate variability is
displayed right next to the feature channel.

Output

Calculate Mean HR [bpm] – mean HR of Calculation Interval

Calculate Standard Deviation of HR [%] – standard deviation of HR in Calculation Interval
Calculate RMSSD [ms] - root mean square of successive differences of HR in the Calculation Interval

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Configure CSA

Select the CSA feature and click on the Advanced button to open the following dialog:

Calculation

NFFT - number of samples for the FFT

Overlap - number of samples that overlap
Start Frequency - lower value of y-axis scaling in Hz
End Frequency - higher value of y-axis in Hz
Blockoverlap - number of samples that overlap with preceding epoch
Epoch Duration - duration between calculated FFT outputs
Amplitude Min [µV] – minimal amplitude coded in the colormap
Amplitude Max [µV] – maximal amplitude coded in the colormap
Number of Colors – number of color used for the CSA colormap

Display
Time on Screen [min] - enter the minutes shown on one page in the Feature Viewer

Click the Colormap… button in the Calculation section to define the colormap used for the CSA. This
opens the following dialog:

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The CSA is plotted in µV2/Hz ranging from Amplitude Min to Amplitude Max. In the example below, the
different colors in the color bar represent the power of the signal recorded with a logarithmic scale ranging
from 0.006 to 25.000 µV2/Hz with 256 colors.

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Marker Definition
Markers can be used during measurement to highlight certain events. g.Recorder allows the user to
define markers which indicate a specific time point, and region markers which indicate a time window.

Click on Marker Definition under the Analysis menu.

to open the following window:

Define one marker with the key m and name Movement, select the green color. Do not check the Toggle
checkbox to have a marker that indicates a specific point in time. Use the Add button to define the
marker.

Then define key e as a region marker by checking the Toggle checkbox. Set the description to Event.

Finally, close the window.

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Evoked Potentials Definition
The Evoked Potentials Configuration dialog allows the user to configure the calculation of evoked
potentials.

Click on Evoked Potentials at the Analysis menu.

Filtering:
• Bandpass filter – contains a list of previous defined filters to preprocess incoming raw data. The
filter is applied before the data is framed by the occurrence of a trigger. The filter is only applied
for EP calculation, not to recorded or displayed raw data in the Data Viewer.

Trigger Channels:
• Enable/disable calculation of evoked potentials for target and/or non-target EPs.
• Select a trigger source from the list of acquired digital inputs or defined keyboard markers. In the
example above, keyboard marker a (Keyboard) is selected as the trigger for calculation of target
EPs and keyboard marker s (Keyboard) is selected as the trigger for calculation of non-target
EPs.

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 • If a combined trigger is used, define the Value that triggers calculation of the corresponding class
of evoked potentials.
• If only one class of evoked potentials (e.g. target EPs) is selected and has a trigger assigned, the
Separate target and non-target evoked potentials by odd and even trial numbers option can
be used to assign each second occurrence of the same trigger to the other class of evoked
potentials (non-target EPs) automatically.

Baseline Correction:
• Enable/Disable Correct baseline of frames before averaging to either remove or allow offsets
for evoked potential calculations. If enabled, the offset of the pre-trigger period is removed from
the whole frame for each channel and each trial individually.

Averaging:
• Select Average all frames to average up each triggered frame of the same class as long as the
session lasts. Select Average a limited number of most recent frames only to only include the
selected number of most recently triggered frames of the corresponding class in the averaged
result.

Significance:
• Calculate significance – Enable/Disable highlighting of statistical significant differences between
the target and non-target evoked potential classes. This option will only be available if two
classes of evoked potentials are calculated.
• The Significance level is the maximum acceptable probability of error for significance calculation
in percent.
• Select the number of Minimum frames required for calculation and display of significance.

Trigger Timing:
• Set the Pre-Trigger period duration to define the acquired time before the trigger occurrence.
• Set the Post-Trigger period offset to define the gap to leave blank after the trigger occurrence.
This can be useful to suppress artifacts that accompany the stimulus (e.g. audio trigger artifacts)
in display only. The Post-trigger period offset gap is not excluded from calculation.
• Set the Post-Trigger Period duration to define the acquired time after Post-Trigger period
offset.

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Save Configuration
To store the settings select Save Setup as… function in the File menu.

The last configuration is loaded automatically at the next program start.

Load Configuration from the command line

g.Recorder can be initialized by previous stored configurations using the command line option
grecorder \d [Configuration file].

If the configuration file cannot be found at startup, then the last used configuration will be loaded. This
option is useful for providing specific study setups.

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