99 Washington Street

Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com
User Manual Back to the Extech 381395 Product Page

Model 381395

5MHz Dual Channel

True RMS Oscilloscope Datalogger

FUNC

i
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
 Table of Contents
1. GENERAL INFORMATION 1-1
1.1. FEATURE OVERVIEW 1-1
1.1.1. Universal SCOPE Mode 1-1
1.1.2. DATA Logger 1-1
1.1.3. Digital Multi-Meter 1-2
1.1.4. Frequency Counter 1-2
1.1.5. General 1-2
1.2. WARRANTY INFORMATION 1-3
1.3. PRECAUTIONS 1-3
1.4. MAINTENANCE 1-3
1.5. SAFETY INFORMATION: READ FIRST 1-4
1.6. SYMBOLS AND TERMS 1-4
1.7. UNPACKING THE INSTRUMENT 1-5
1.7.1. Standard 1-5
1.7.2. Options 1-5

2. PRODUCT DESCRIPTION 2-1

2.1. THE INPUT TERMINAL AREA 2-2
2.1.1. Caution ( ) 2-2
2.1.2. Warning ( ) 2-2
2.1.3. 600V MAX 2-2
2.1.4. The METER provides 4 input jacks 2-2
2.2. THE KEYS AREA 2-3
2.2.1. Turning power on and off ( ) 2-3
2.2.2. AUTO key ( ) 2-3
2.2.3. TRIGger key ( ) 2-3
2.2.4. Function key ( ) 2-4
2.2.5. Command menu keys ( ) 2-4
2.2.6. Four arrow keys ( ) 2-5
2.2.7. Display back light ( ) 2-6
2.2.8. Hold key ( ) 2-6
2.3. THE DISPLAY AREA 2-7
2.3.1. Special indicator 2-7
2.3.2. DISPLAY depends on selected function 2-8
2.3.3. The Command Menu 2-15

ii
 2.4. THE USB INTERFACE AND POWER INPUT TERMINAL 2-16
2.4.1. USB INTERFACE 2-16
2.4.2. Power Adaptor Input Terminal 2-16

3. USING THE SCOPE 3-1

3.1. POWERING THE METER 3-1
3.2. DISPLAY BACKLIGHT 3-1
3.3. SELECTING “GENERAL SCOPE” IN THE MENU 3-1
3.4. SELECTING ITEMS IN SCOPE SETUP MENU 3-2
3.4.1. Set Frequency measurement for CHA 3-2
3.5. CHANGING THE GRAPHIC REPRESENTATION 3-3
3.5.1. Changing the vertical division 3-3
3.5.2. Changing the Horizontal division (Time Base) 3-3
3.5.3. Positioning the Waveform of CH A on the Screen 3-4
3.5.4. Positioning the Waveform of CH B on the Screen 3-4
3.5.5. Positioning the Trigger Point Indicator on the Screen 3-4
3.6. ACQUIRING THE WAVEFORM 3-5
3.6.1. Recording slow signals over a Long Period of Time. 3-5
3.6.2. Selecting AC-Coupling for INPUT A 3-5
3.7. TRIGGERING ON A WAVEFORM 3-6
3.7.1. Setting Trigger mode (Tmode) 3-6
3.7.2. Setting AUTO Trigger Level 3-7
3.7.3. Setting Normal Trigger mode 3-8
3.7.4. Setting Trigger Slope 3-8
3.7.5. Changing the Trigger level Indicator 3-8
3.7.6. Making a single acquisition 3-9
3.8. STORING AND RECALLING SCREENS 3-9
3.8.1. Storing Screen 3-9
3.8.2. Recalling Screen 3-10

4. USING THE DATA LOGGER 4-1

4.1. SELECTING ITEMS IN DATA LOGGER SETUP MENU 4-1
4.1.1. Changing the Sampling Type 4-1
4.1.2. Changing the Sampling interval Time 4-2
4.1.3. Changing the Start/Stop Address 4-2
4.2. DATA LOGGER 4-3
4.2.1. Changing the Measurement Function & Range 4-4
4.3. RECALL DATA 4-4

5. USING THE DIGITAL MULTIMETER 5-1

5.1. THE DIGITAL MULTIMETER DISPLAY MODE 5-1

iii
 5.1.1. RECORD MODE 5-1
5.1.2. RELATIVE MODE 5-1
5.1.3. COMPARE MODE 5-2
5.1.4. TREND PLOT 5-2
5.2. MEASUREMENT PROCEDURES 5-3
5.2.1. DC V 5-3
5.2.2. AC V 5-4
5.2.3. Resistance 5-5
5.2.4. Continuity 5-5
5.2.5. Frequency 5-6
5.2.6. RPM 5-6
5.2.7. Pulse Width 5-7
5.2.8. Duty 5-7

6. SYSTEM SETUP 6-1

6.1. CONFIGURE THE AUDIBLE BEEPER 6-1
6.2. AUTO POWER OFF 6-1
6.3. SET THE BAUD RATE (BPS) 6-1
6.4. CHANGE THE CURRENT DATE AND TIME 6-2
6.4.1. Setting the time 6-2
6.4.2. Setting the date Error!
Bookmark not defined.

7. SPECIFICATIONS 7-1
7.1. GENERAL SPECIFICATIONS 7-1
7.2. TECHNICAL SPECIFICATIONS 7-2
7.2.1. General Oscilloscope Function Specs. 7-2
7.2.2. Data Logger Function Specs. 7-3
7.2.3. Digital Multimeter Function Specs. 7-3

8. REMOTE PC INTERFACE 8-1

8.1. USB HID DEVICE INSTALLATION 8-1
8.1.1. System Requirements 8-1
8.1.2. Operating System 8-1
8.2. PC USB PORT CONNECTION 8-1
8.2.1. HID Device 8-1
8.3. INSTALLING WINDOWS APPLICATION SOFTWARE 8-2
8.4. RUNNING THE APPLICATION SOFTWARE 8-3
8.4.1. Oscilloscope Mode 8-3
8.4.2. DMM & Data Logger Mode 8-4
8.4.3. Display Mode for DMM & Data Logger Mode 8-5

iv
9. MAINTAINING THE METER 9-1
9.1. SECTION OVERVIEW
ERROR! BOOKMARK NOT DEFINED.
9.2. STATIC SAFE HANDLING 9-1
9.3. CLEANING THE METER 9-1
9.4. STORING THE METER 9-2
9.5. CALIBRATION 9-2
9.6. REPLACING AND DISPOSING OF THE LI-ION BATTERY 9-2
9.6.1. Replacing the battery pack 9-3

10. APPENDICES 10-1

10.1. TROUBLESHOOTING GUIDE 10-1
10.2. LCD STATUS INDICATION BY FUNCTION 10-2
10.2.1. Function Menu & General Scope Mode 10-2
10.2.2. Data Logger Mode 10-2
10.2.3. Multimeter / Record Mode 10-2
10.2.4. Multimeter / Relative Mode 10-3
10.2.5. Multimeter / Compare Mode 10-3
10.2.6. Multimeter / Trend Plot Mode 10-3
10.2.7. System Setup Mode 10-4
10.2.8. Trigger Setup Mode 10-4

v
 1. General Information

1. General Information
This section contains general Meter information. The bulleted list below outlines the section.

z Feature Overview
z Warranty Information
z Safety Information
z Symbols and Terms
z Specifications
z Unpacking the Test Tool Kit

1.1. Feature Overview

The Model 381395 is a handheld, battery-operated Oscilloscope, True RMS Data Logger
and Digital Multimeter designed and tested according to IEC Publication 1010-1 (EN 61010-
1:1993, Over voltage Category II)

This instrument features:

1.1.1. Universal SCOPE Mode

z Dual Channel with Auto Calibration
z Sampling Time
Single CH mode: 50 MS/s, Dual CH mode: 25 MS/s
z DC to 5MHz Oscilloscope bandwidth
z 16 shot waveform and setup memories
z Automatic Triggering
z Automatic setting for horizontal and vertical divisions
z Roll and Single shot modes
z Excellent internal noise reduction
z Real time Updates

1.1.2. DATA Logger

z Logger Memory: 17,000 Data Points
z Logs the following signal types: DCV, ACV, OHM, BZ, Hz, RPM, P/width, Duty
z Prints programmed intervals in Hours/Minutes/Seconds
z Appends incoming data to existing data

1-1 Model 381395 Version 1.0 January 2008

 1. General Information

z Sampling Rate: 0.25S/s

z Sampling intervals from 1 second to 9,999 seconds
z Sampling Mode: Peak and Sampling Time
z Built-in Real Time Clock (RTC)
z Start / Stop address setting
z Data is retained when battery is low or has been removed

1.1.3. Digital Multi-Meter

z Large 10,000 count LCD and fast 101 segment analog Bar Graph display
z Programmable Function mode: Multi display measurements
Record (Max, Min, Avg), Relative (Ref, Err), Compare (GO-NOGO) mode and Trend plot
z Real Time for MAX or MIN, elapsed time for AVG
z Meter automatically selects best range instantly (Fast Auto range)
z Data hold and run mode
z RPM, Duty cycle and Pulse width measurement
z True RMS digital Multi-meter
z Max. Voltage between Input and Ground: DC or AC 600Vrms
z 600V Overload Protection

1.1.4. Frequency Counter

z Frequency Range: 0 to 10MHz
z Accuracy: ±(0.05%+5)

1.1.5. General
z Easy to Operate
z Backlit display with Low battery indication
z USB PC interface for viewing and saving measurements and waveform data
z Auto power off (can be disabled)
z Display resolution: 132 x 128 pixels
z Designed to comply with safety standards: UL3111 and CSA C22.2 No.1010-1

1-2 Model 381395 Version 1.0 January 2008

 1. General Information

1.2. Warranty Information

EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and
workmanship for one year from date of shipment (a six month limited warranty applies to sensors and
cables). If it should become necessary to return the instrument for service during or beyond the
warranty period, contact the Customer Service Department at (781) 890-7440 ext. 210 for
authorization or visit our website www.extech.com for contact information. A Return Authorization
(RA) number must be issued before any product is returned to Extech. The sender is responsible for
shipping charges, freight, insurance and proper packaging to prevent damage in transit. This warranty
does not apply to defects resulting from action of the user such as misuse, improper wiring, operation
outside of specification, improper maintenance or repair, or unauthorized modification. Extech
specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and
will not be liable for any direct, indirect, incidental or consequential damages. Extech's total liability is
limited to repair or replacement of the product. The warranty set forth above is inclusive and no other
warranty, whether written or oral, is expressed or implied.

1.3. Precautions
z Carefully read the manual before operating this device
z The contents of this manual may be amended by the manufacturer without notice
z Never dismantle the instrument
z The equipment has been tested and calibrated before delivery
z This product should be stored in a secured area
z The rear protective terminal must be connected to actual earth ground otherwise electric
shock may occur.

1.4. Equipment Maintenance

z Although the equipment is durable and weather resistant, care should be taken not to
expose it to severe impact or pressure
z Keep the equipment clear of water and damp environments
z Calibration should performed once per year
z Do not operate this instrument if it appears damaged or if it functions abnormally
z Do not use the Meter near explosive gas or vapors
z To clean, wipe the surface of the equipment with a dry and clean cloth

1-3 Model 381395 Version 1.0 January 2008

 1. General Information

1.5. Safety Information: Read First

Warning!
Please read the following safety information before using the product. To avoid possible
electric shock or personal injury, please read and follow these guidelines carefully:
z Follow the guidelines in this manual and DO NOT use the Meter if the case is damaged
z Do not apply excessive voltage to the Multimeter. Apply voltage within the rated range
only
z Use caution when measuring voltages above 30V RMS, 42V peak, or 60V DC. These
voltages pose an electric shock hazard
z When using the probes always keep fingers behind the finger guards
z Always connect the common test leads (black) before connecting the live test leads (red),
and disconnect the live test leads (red) before disconnecting the common test leads
(black)
z Disconnect circuit power and discharge all high-voltage capacitors before testing
resistance and continuity
z Only qualified personnel should open the meter case
z When replacing fuses, use only the specified type and rating
z Do not try to operate the Meter if it is damaged. Disconnect the power from the equipment
and connect the point of purchase for return and repair information

1.6. Symbols and Terms

See explanation in manual before using this Meter. This symbol indicates hazards that
may cause damage to the instrument or may result in personal injury
This symbol indicates high voltage may be present. Use extra caution
Double Insulation (Protection Class II)
Recycling information
Equal potential inputs
High BNC Input
Earth (ground) terminal.
AC or DC
DC – Direct Current
AC – Alternating Current
Fuse
This product complies with the essential requirements or the applicable European laws
or directives with respect to safety, health, environment and consumer protections

1-4 Model 381395 Version 1.0 January 2008

 1. General Information

1.7. Unpacking the Test Tool Kit

The product package is supplied with the following items:

1.7.1. Standard
z One Meter
z Two Test leads
z One Lithuim-ION Battery (installed)
z One AC Power & Rechargeable Adaptor
z One CD (PC software)
z Meter to PC USB interface cable
z One Carrying case

1.7.2. Options
z Rubber Holster

1-5 Model 381395 Version 1.0 January 2008

 2. Product Description

2. Product Description
A brief introduction to the basic operation of the meter is provided below. There are four
major parts of the METER. Each will be addressed in the following sections.

1. The input Terminal area

3
2. The Keys area

3. The Display area

4. The USB Interface and

2 Power input terminal

FUNC

2-1 Model 381395 Version 1.0 January 2008

 2. Product Description

2.1. The input Terminal area

3 2

4 1

2.1.1. Caution ( )
Refer to the User Manual before using this Meter.

2.1.2. Warning ( )
Be extremely careful when making high-voltage measurements; DO NOT TOUCH THE
TERMINALS OR THE ENDS OF TEST LEAD PROBES

2.1.3. 600V MAX

To avoid electrical shock or instrument damage, do not connect the COM input terminal to
any source of more 600V with respect to earth/ground.

2.1.4. The METER provides 4 input jacks (see above)

1) Channel A
Use Channel A for all single input measurements.

2) Common
Use Common (Black) as single ground for low frequency measurements and for ACV, DCV,
Ohm, Continuity, Hz, RPM, P/W and DTY measurements.

3) Channel B
For measurements on two signals use Channel B in combination with Channel A.

4) External trigger
The EXT.TRIG input accepts external trigger signals.

2-2 Model 381395 Version 1.0 January 2008

 2. Product Description

2.2. The Keys area

F1 5
2 TRIG 3
7 8
1 FUNC 4

2.2.1. Powering ON and OFF ( )

Pressing and holding this key for 2-3 seconds will turn the unit on.
Pressing this key again will turn the power off.

2.2.2. AUTO key ( )

1) In General Scope Mode, pressing this key will change the Vertical and Horizontal
divisions from Manual to Auto-setting ( ).
2) In Data Logger and Digital Multimeter modes, pressing this key will switch the Range
mode to Auto-range mode (AT).

2.2.3. TRIGger key ( )

Triggering informs the Meter when to begin displaying a waveform.
This key is available for use in General Scope Mode only.
c Trigger Source: Ch A or B
1 2 3 d Slope: Rising or Falling
4 e Trigger setting mode (Auto or
Normal)
5 f Trigger Level indicator
g Trigger point indicator
h Command Menu: Trigger level
i Command Menu: Single shot
6 7 8 j Command Menu: Trigger mode
(Setup)

2-3 Model 381395 Version 1.0 January 2008

 2. Product Description

2.2.4. Function key ( )

Press key to display the default menu and submenus as shown below.
c : Use the arrow keys to highlight an item.
d : Select the item
e To enter the Setup mode for a particular Function, press key.

1
2
3
4
5

GENERAL SCOPE DATA LOGGER

c RECORD MODE d RELATIVE MODE e COMPARE MODE

f TREND PLOT g SYSTEM SETUP

2.2.5. Command menu keys ( )

F1 through F4 are command menu soft-keys. These keys have a corresponding menu item
displayed on the LCD. Press a soft-key to select the command term shown above the key.

2-4 Model 381395 Version 1.0 January 2008

 2. Product Description

2.2.6. Four arrow keys ( )

These keys serve as the primary means of navigating the instrument’s menus and operating
displays.

1) In the General Scope Mode

(1) When command menu is in Div mode. ( )
Æ Vertical (Volt) Division changes.

• : Press to select a higher division value.

[Ex-1] 50mÆ0.1Æ0.2Æ0.5Æ1Æ2Æ…Æ50Æ100Æ200V

• : Press to change to a smaller division.

Or
[Ex-2] 200Æ100Æ50Æ…Æ2Æ1Æ0.5Æ0.2Æ0.1Æ50mV
(2) When command menu is in Pos mode. ( )
Æ The Waveform for Channel A or B can be moved.

• : Press to move the waveforms upward.

• : Press to move the waveforms downward.

(1) When command menu is in Div mode. ( )

Æ Horizontal (Time) Division changes can be made.

• : Press to select a higher value (in seconds).

[Ex-1] 1uSÆ2uSÆ5uSÆ10uSÆ…Æ1SÆ2SÆ5S

• : Press to select a lower value (in seconds).

Or [Ex-2] 5SÆ2SÆ1SÆ…Æ10uSÆ5uSÆ2uSÆ1uS
(2) When the command menu is in the Pos mode.
( )
Æ The Trigger point indicator ( ) can be move.

• : Press to move the Trigger point indicator leftward.

• : Press to move the Trigger point indicator rightward.

2-5 Model 381395 Version 1.0 January 2008

 2. Product Description

2) In the Data Logger and Multimeter Modes

To make Measurement Range changes:

• Press key to select a higher range.

Or [Ex-1] 000.1mVÆ0.001VÆ00.01VÆ000.1V

• Press key to select a lower range.

[Ex-2] 000.1VÆ00.01VÆ0.001VÆ000.1mV
To change the Measurement Function, use the left or right arrow key:

• Use the key:

Or [Ex-3] DTYÆP/WÆRPMÆFRQÆBZÆOHMÆACVÆ DCV

• Use the key:

[Ex-4] DCVÆACVÆOHMÆBZÆFRQÆRPMÆP/WÆDTY

3) In the System Setup mode

, , , : Use the arrow keys to move the cursor and to increase / decrease the
value of a selection.

2.2.7. Display back light ( )

Press this key to turn on the backlight.
To turn the back light off, press this key again.

2.2.8. Hold key ( )

1) In the General Scope Mode
The meter can store setups and waveforms in its internal memory for later recall. Sixteen (0-
15) setup and waveform memories are available.
Memory mode. ( )

2) In Data Logger and Multimeter Mode

All readings and waveforms can be held (frozen on the display) at any time in this mode.

2-6 Model 381395 Version 1.0 January 2008

 2. Product Description

2.3. The Display area

The screen is divided into three areas: INDICATORS, DISPLAY area, and COMMAND
MENU. Refer to the Figure below.

2.3.1. Special indicators

▪ HOLD: Freezes the LCD display reading

▪ REMOTE: Indicates that the meter is communicating with a PC (USB Interface)
▪ BACK LIGHT ( ): Back light indicator
▪ Charging LINE ( ): Charging Battery indicator
▪ BATTERY ( ): Low battery indicator
▪ BUZZER ( ): Buzzer indicator

2-7 Model 381395 Version 1.0 January 2008

 2. Product Description

2.3.2. Function-Dependent DISPLAYS

1) Display Functions in the Menu mode
Configure the General Scope, Data Logger, Multimeter and System settings

c Press to open Function Menu d Press to open Setup

PATH:

2) General Scope mode Displays

The screen is divided into four areas: Set point area, Live Scope display area, Division
setting area and Command Menu area. Refer to Figure below.

3
4
c ÆGENERAL SCOPEÆ d Press to open Setup
PATH: Æ ÆSelects “GENERAL SCOPE”Æ
(2-1) (Refer to diagram above) The settings are shown in this area.
c-1. : Displays the numerical readings. If only input A is used, only input
A readings will display, for example.
c-2. : Trigger selection: Channel A, B and External
c-3. : Rising or falling edge
c-4. : Trigger mode: Normal or AUTO
c-5. : Channel mode status
Æ : Vertical mode: CHA, CHB or A&B
Æ : Horizontal mode: Normal, Roll
c-6. : When pressing key in Scope mode only, the Memory Address appears at
the top-right corner of the display area.

2-8 Model 381395 Version 1.0 January 2008

 2. Product Description

(2-2) Live Scope display area

d-1 : Trigger level indicator
d-2 : Trigger point indicator
d-3 Live Scope Display (Channel A): Displays real time waveforms and freezes captures.
d-4 Live Scope Display (Channel B)

(2-3) The Division value will be shown in this area.

e-1 : Vertical Division of Channel A
e-2 : Vertical Division of Channel B
e-3 : Horizontal Divisions (Time base)
Pressing key changes Vertical division or horizontal division from MANUAL to AUTO
( ).

(2-4) Command Menu Field

f-1 Default command Menu:
If the key is pressed, the command menu changes to
Toggle the command Menu items Div and Pos using the key.
f-2 Press key to display the TRIGGER command menu.

(2-5) The Setup mode for the Scope

g-1 AC/DC Coupling for Channel A
g-2 AC/DC Coupling for Channel B
g-3 Set CHA, CHB or CHA & CHB for Vertical mode
g-4 Set NORMal or ROLL for Horizontal mode
ROLL MODE operates when the horizontal division is between 1s and 5s
g-5 Set the Measurement Function for Channel A

3) Data Logger mode Displays

1
2
5
3

c Æ DATA LOGGER Æ d Press to open Setup e Press to change Edit

mode

PATH: Æ ÆSelects “DATA LOGGER”Æ

2-9 Model 381395 Version 1.0 January 2008

 2. Product Description

(3-1) Display the Date and Time. (Data Logger and DMM Function)
c-1. : Current: dd-mm-yyyy
c-2. : Current Time: hh:mm:ss

(3-2) Primary Numerical Field (Data Logger and DMM Function)

d-1. : Display of the current Function value
d-2. : Display numerical readings. The display updates four times per second
d-3. : The analog bar-graph provides a visual indication of
measurement similar to a traditional analog meter needle
d-4. : AUTO range. The default for “RANGE” is auto-range
d-5. : Display of the current Function indicator

(3-3) Display of Datalogger info (number of readings, time, and measurement data)
e-1. : Displayed or for the sampling type
e-2. : Logged data Record Number
e-3. : Time of logged data
e-4. : Numerical reading
e-5. : Logged data.
e-6. : (End of Data) shown when last data point has been reached

(3-4) The Data Logger Command Menu

f-1. : Open the Data Logger Setup mode
f-2. : Erase the displayed logged data
f-3. : Displays stored readings and buffer statistics
f-4. : Start the Data Logger

(3-5) The Setup mode for Data Logger.

g-1. : Set the Measurement Function
g-2. : Set the Sampling type, or
▪ : Sample (interval) Mode
▪ : Peak Detect Mode. The displayed value updates only when a new peak value is
detected.

g-3. : Set the Sampling interval time, 1Sec to 9,999Sec

2-10 Model 381395 Version 1.0 January 2008

 2. Product Description

g-4. : Set the Start Address for the Data logger

g-5. : Set the Stop Address for the Data logger

4) DMM mode Displays

(4-1) RECORD MODE

1
2
5
3

c ÆRECORD MODEÆ d Press to open Setup

PATH: Æ ÆSelects “RECORD MODE”Æ

(1) Date and Time (Data Logger and DMM Function)

c Refer to Data Logger section.

(2) Primary Numerical Field (Data Logger and DMM Function)

d Refer to Data Logger section.

(3) Number of records and the time stamp.

e-1. : The displayed value updates only when a new
maximum value is detected.
e-2. : The displayed value updates only when a new average
value is detected.
e-3. : The displayed value updates only when a new
minimum value is detected.
e-4. : Total number of data.
e-5. : Total elapsed time.

(4) The Command Menu for Record mode

f-1. : Opens Setup mode for the Record mode
f-2. : All data are set to zero.
f-3. : Freezes the displayed value.

(5) The Setup mode for the Record mode

g-1. : Set the Measurement Function

2-11 Model 381395 Version 1.0 January 2008

 2. Product Description

Select from the following functions. DCV, ACV, OHM, BZ, FRQ, RPM, P/W or DTY.

(4-2) RELATIVE MODE

1
2
5
3

4
c ÆRELATIVE MODEÆ d Press to open Setup e Press to change Edit
mode

PATH: Æ ÆSelects “RELATIVE MODE”Æ

(1) Display the Date and Time (Data Logger and DMM Function)
c Refer to Data Logger section.

(2) Primary Numerical Field (Data Logger and DMM Function)

d Refer to Data Logger section.

(3) Displays the Relative data and time.

e-1. : Reference value
e-2. : Difference value, Difference = Measured value– Reference (REF)
e-3. : Error rate, ERR % = Difference / Reference x 100
e-4. : The mean error
e-5. : Total elapsed time

(4) The Command Menu for the Relative mode

f Refer to the Record mode

(5) The Setup mode for Relative

g-1. : Set the Measurement Function.
Select from the following functions. DCV, ACV, OHM, BZ, FRQ, RPM, P/W or DTY.
g-2. Edit the Relative mode Reference point.

(4-3) COMPARE MODE

2-12 Model 381395 Version 1.0 January 2008

 2. Product Description

1
2
5
3

4
c ÆCOMPARE MODEÆ d Press to open Setup e Press to change Edit
mode

PATH: Æ ÆSelects “COMPARE MODE”Æ

(1) Display of the Date and Time (Data Logger and DMM Function)
c Refer to Data Logger section.

(2) Primary Numerical Field (Data Logger and DMM Function)

d This field compares the input value to a high and low limit value. A LO is displayed if the
input value is lower than the low limit, PASS if the input value is within the high and low limit
values and HI if the input is greater than the high limit.

(3) Display of the Comparison data and time.

e-1. : To be set value for HI limit.
e-2. : To be set value for LOW limit
e-3. : Reading value
e-4. : Total pass muster
e-5. : Total elapsed time

(4) The Command Menu for Relative mode

f Refer to Record mode.

(5) The Setup mode for the Compare function

g-1. : Set the Measurement Function.
Select from the following functions. DCV, ACV, OHM, BZ, FRQ, RPM, P/W or DTY.
g-2. Edit Compare mode high point.
g-3. Edit Compare mode low point.

2-13 Model 381395 Version 1.0 January 2008

 2. Product Description

(4-4) TREND PLOT

1
2
5
3

c ÆTREND MODEÆ d Press to open Setup e Press to change Edit

mode

PATH: Æ ÆSelects “TREND PLOT”Æ

(1) Display of the Date and Time (Data Logger and DMM Function)
c Refer to Data Logger section.

(2) Primary Numerical Field (Data Logger and DMM Function)

d Refer to Data Logger section.

(3) Display of the graph trend plot.

e-1. : Horizontal Division per div
e-2. : Displays the graph with the reference value as the center
value

(4) The Command Menu

f-1. : The Reference value, horizontal and vertical axis values (REF, H/Div, V/Div)
are displayed.
f-2. : Erase the graph
f-3. : Starts the graph plot (using REF value as the centerline).

(5) The Setup mode for the Trend plot

g-1 or
g-2 The Offset is the centerline value on the trend graph
g-3 V/DIV is the Y axis (amplitude).
g-4 H/Div is the X axis (time)

2-14 Model 381395 Version 1.0 January 2008

 2. Product Description

5) The Display of SYSTEM SETUP mode

1) Set the Time and Date

1-1) Time: hh:mm:ss
1-2) Date: dd-mm-yyyy

c Æ SYSTEM SETUP Æ d Press to change Edit mode

PATH: Æ ÆSelects “SYSTEM SETUP”Æ

(1) BEEPER: Beeper on/off

(2) AUTOPOWER OFF: Auto power off selection
(3) BAUD RATE (BPS): USB Baud rate selection
(4) TIME SET: Set current time
(5) DATE SET: Set Date of today
(6) CONTRAST: LCD Contrast adjust

2.3.3. The Command Menu

The command menu is changed depends on the function with each function.
Mode PATH Command Menu
Function
Menu

Div: ÆG/ScopeÆ

Pos: ÆG/ScopeÆ Æ
General
Scope Trigger: ÆG/ScopeÆ Æ
Store/Recall:
ÆG/ScopeÆ Æ
Data Logger ÆD/LoggerÆ
Record/Relative/Compare
ÆRecordÆ
Multimeter
Trend plot
ÆTrendÆ
ÆSystem setupÆ
System setup Edit mode:

ÆSystem setupÆ

2-15 Model 381395 Version 1.0 January 2008

 2. Product Description

2.4. The USB Interface and Power input terminal

2.4.1. USB INTERFACE

Enables the Meter to communicate with a PC over a Universal Serial Bus (USB).
Connect the meter to the PC using the supplied communication cable. The TRS
(tip/ring/sleeve phone plug) end of the cable connects to the meter (top) and USB end
connects to the PC USB port.

2.4.2. Power Adaptor Input Terminal

If an AC/DC power adapter is to be used, ensure that the adapter is plugged into an
appropriate live power source.

2-16 Model 381395 Version 1.0 January 2008

 3. Using the Scope

3. Using the Scope

3.1. Powering the METER

Follow the steps below to power the Meter from a standard AC outlet.
1. Insert the Power Adaptor into an AC outlet.
2. Connect the Power Adaptor to the Meter.
3. Turn the Meter on by holding this key for 2-3 seconds.
4. The meter powers up configured as it was at last power down.

3.2. Changing Backlight

1. Press Backlight ON.
2. Press Backlight OFF.
Note: Using the meter without the backlight increases battery life by 1 hour approximately.

3.3. Selecting “GENERAL SCOPE” in the Menu

Follow steps c through e to open a menu and choose an item.

Open the FUNCTION menu.

▪ General Scope
c
▪ Data Logger
▪ Multimeter (4 type)
▪ System Setup

d Use the arrow keys to highlight the item.

e Set the “GENERAL SCOPE”.

PATH: Æ Æ

3-1 Model 381395 Version 1.0 January 2008

 3. Using the Scope

3.4. Selecting items in SCOPE SETUP menu

Subsequently follow steps c to f to open a menu and to choose an item.
Default command menu.
b

Open the Scope Setup menu.

d Use the arrow keys to highlight an item.

e Select the item.

f Exit

PATH: Æ Æ Æ

3.4.1. Set Frequency measurement for CHA

To choose a Frequency measurement for Channel A, perform the following:
Plug the black test lead into the COM input jack and plug the red test
c Input jack
lead into the CHA input jack.

Start Display
d Æ

e Highlight Hz (□ Hz).

f Set Hz (■ Hz).

g Exit

Observe that Hz is now the main reading.

h The Frequency unit appears at the top-left corner of the display area.
(Refer to above picture DCVÆFRQ)
PATH: Æ Æ Æ

3-2 Model 381395 Version 1.0 January 2008

 3. Using the Scope

3.5. Changing the Graphic Representation

3.5.1. Changing the vertical division

c With the menu as shown at right> ( )

d Change command Menu Pos to Div. ( )

Vertical Division is changed to manual mode

• Pressing key increases CHA vertical division (A/div).

e or 50mVÆ0.1VÆ0.2VÆ0.5VÆ1VÆ2VÆ5VÆ10VÆ20VÆ50VÆ100VÆ200V

• Pressing key decreases CHA vertical division (A/div).

200VÆ100VÆ50VÆ20VÆ10VÆ5VÆ2VÆ1VÆ0.5VÆ0.2VÆ0.1VÆ50mV

f Change Div from Manual mode to AUTO mode.

PATH: Î , or
1) Pressing increases CHA (or CHB) vertical division.
2) Pressing decreases CHA (or CHB) vertical division.
3) Pressing will change the division from MANUAL to AUTO ( ) mode.

3.5.2. Changing the Horizontal division (Time Base)

c With the menu as shown at right>. ( )

d Change command Menu Pos to Div. ( )

Change the Horizontal Division (Time base)

• Pressing key decreases Horizontal division (H/div).

e 5SÆ2SÆ1SÆ500mSÆ…Æ50uSÆ20uSÆ10uSÆ5uSÆ2uSÆ1uS
or
• Pressing key increases Horizontal division (H/div).

1uSÆ2uSÆ5uSÆ10uSÆ20uSÆ50uSÆ…Æ500mSÆ1SÆ2SÆ5S

f Change Div from Manual mode to AUTO mode.

PATH: Î , or
1) Pressing increases the Horizontal Division (Time base).
2) Pressing decreases the Horizontal Division (Time base).
3) Pressing will change the division from MANUAL to AUTO ( ) mode.

3-3 Model 381395 Version 1.0 January 2008

 3. Using the Scope

3.5.3. Positioning the Waveform of CH A on the Screen

With the menu as shown > , press key to
c
change the command menu Div to Pos ( ).

or
Default Screen Æ Æ Æ

PATH: Î or
1) Pressing moves the waveform of Channel A downward.
2) Pressing moves the waveform of Channel A upward.

3.5.4. Positioning the Waveform of CH B on the Screen

With the menu at right> , press key to
c
change the command menu Div to Pos ( ).
To change the Division command menu from CHA to CHB.
d

Next
e Same as example above for “Positioning CH A Wave on the Screen”
procedure
PATH: Î Î or
1) Pressing moves the waveform of Channel B downward.
2) Pressing moves the waveform of Channel B upward.

3.5.5. Positioning the Trigger Point Indicator on the Screen

With the menu at right > , press key to change
c
the command menu Div to Pos ( ).

d Or

Default Screen Æ Æ
PATH: Î or

3-4 Model 381395 Version 1.0 January 2008

 3. Using the Scope

1) Pressing moves Trigger Point Indicator leftward.

2) Pressing moves Trigger Point Indicator rightward.

3.6. Acquiring a Waveform

Start Display
c Æ

3.6.1. Recording slow signals over a Long Period of Time.

d Highlight ROLL mode.

e Set the ROLL mode.

f Exit

PATH: Î Î Î
The ROLL mode function supplies a visual log of waveform activity and is especially useful
when measuring lower frequency waveforms.
Note: ROLL MODE operates when the horizontal division is between 1sec. and 5 sec.

3.6.2. Selecting AC-Coupling for INPUT A

d Highlight AC for INPUT A.

e Set the AC-coupling for INPUT A.

f Exit

PATH: Î Î Î
Use AC-coupling to observe a small AC signal that rides on a DC signal.

3-5 Model 381395 Version 1.0 January 2008

 3. Using the Scope

3.7. Triggering on a Waveform

Triggering alerts the Meter to begin displaying a waveform. Refer to the instructions that
follow:
z Select a Source Channel
z Select rising or falling edge on which to trigger
z Select a Trigger mode
z Define the condition for waveform updates

The display icons on the top line (right side) of the LCD identify the trigger parameters
currently used. Trigger icons on the screen indicate the trigger level and slope.

①-1. : Trigger selection

1
Channel A, B and External
2
①-2. : Rising or falling edge

3 ①-3. : Trigger mode

Normal or AUTO

② : Trigger level indicator

③ : Trigger point indicator

3.7.1. Setting Trigger mode (Tmode)

Default command menu.
b

c Open the Trigger command menu.

3-6 Model 381395 Version 1.0 January 2008

 3. Using the Scope

Open the Trigger Setup

e Highlight the desired ITEM

f Set the ITEM

g Exit

PATH: Î Î Î Î

3.7.2. Setting the AUTO Trigger Level

For quick operation, use the AUTO trigger mode to trigger on nearly all signals automatically.
To optimize the trigger slope manually, perform the following:
Default command menu.
b

c Open the Trigger command menu.

d Open the Trigger Setup.

e Highlight AUTO.

f Set AUTO.

g Exit.

PATH: Î Î Î Î

3-7 Model 381395 Version 1.0 January 2008

 3. Using the Scope

3.7.3. Setting the Normal Trigger mode

e Highlight NORM.

f Set NORM.

g Exit.

PATH: Î Î Î Î

3.7.4. Setting the Trigger Slope

Trigger on either positive Slope or negative Slope of a waveform.

e Highlight or .

f Set or .

g Exit.

PATH: Î Î Î Î

3.7.5. Changing the Trigger level Indicator

For NORMal Trigger mode:

b Default command menu.

c Open the Trigger command menu.

Adjust the Trigger Level continuously. Observe the Trigger level indicator
d or
( ) on the rightmost time division line.

e Exit.

PATH: Î , or

1) Pressing moves the Trigger level indicator ( ) downward.

2) Pressing moves the Trigger level indicator ( ) upward.

3-8 Model 381395 Version 1.0 January 2008

 3. Using the Scope

3.7.6. Making a single acquisition

To capture single events, perform a single shot. (One time screen update.) To configure the
Meter for a single shot on the Channel A waveform:
Connect the probe to the signal to be measured.
Default command menu.
b

c Open the Trigger command menu.

Highlight Singl (SINGLE SHOT).

d
The meter performs a single shot. (One time screen update)

e Return to normal Trigger mode.

PATH: Î Î

3.8. Storing and Recalling Screens

The meter can store setups and waveforms for later recall. Sixteen (0-15) setup and
waveform memories are available.

3.8.1. Storing Screen

To store a screen, perform the following:
Default command menu.
b

Open the Memory (MEM) 2

menu.
c Memory Menu
c
(Store, Recall, Exit)
d Memory Address (0~15)
(M: 00)

1
Memory field (M:00) appears at the top-right corner of the display area.
d
Select the memory address where the screen is to be stored.

e Store the actual screen

PATH: Î Î

3-9 Model 381395 Version 1.0 January 2008

 3. Using the Scope

3.8.2. Recalling Screen

To recall a screen, perform the following:
Default command menu.
b

Open the Memory (MEM) 2

menu.
c Memory Menu
c
(Store, Recall, Exit)
d Memory Address (0~15)
(M: 00)

1
Memory field (M:00) appears at the top-right corner of the display area.
d
Select the memory address from which to recall the screen

e Recall the screen.

PATH: Î Î
The result will be a fixed image and therefore can not be edited or otherwise changed.

3-10 Model 381395 Version 1.0 January 2008

 4. Using the Data Logger

4. Using the Data Logger

The meter can record DCV, ACV, OHM, BZ, FRQ, RPM, Pulse width or Duty cycle with
signal from a contact. Values are stored in non volatile electronic memory. Data transfer to a
PC for further analysis is performed via the built-in USB interface.
Up to 17,000 measurements can be stored in memory.

PATH: Î (DATA LOGGER)Î Æ

4.1. Items in the Data Logger Setup menu

Follow steps c through i to open a menu and choose an item.

c Open the FUNCTION menu.

d Use the arrow keys to highlight DATA LOGGER.

e Set and Open the Data Logger.

f Open the Data Logger Setup.

g Use the arrow keys to highlight an item.

h Set the desired item.

i Exit

PATH: Î Î Î Î Î Î

4.1.1. Change the Sampling Type

g Use the arrow keys to highlight Sample Type (■ Time or □ Peak).

4-1 Model 381395 Version 1.0 January 2008

 4. Using the Data Logger

h Set the item

i Exit

PATH: Î Î Î Î Î Î

4.1.2. Change the Sampling Interval Time

Example: Set the sampling interval time from 1Sec to 10Sec.

g Use the arrow keys to highlight S/Time (Sec).

Press key to change the Edit mode.

h
[Ex-1] S/Time (Sec): 00001

• Press key to increase, key to decreases the highlighted

i
digit. [Ex-2] S/Time (Sec): 00000
Move the Cursor to highlight the most significant digit.
j
[Ex-2] S/Time (Sec): 00000

• Press key to increase, key to decreases the highlighted

k
digit. [Ex-3] S/Time (Sec): 00010

l Exit

PATH: Î Î Î Î Î Î Î Î Î

4.1.3. Change the Start/Stop Address

Example: Set the Start address from 10001 to 12001.

g Use the arrow keys to highlight Sampling Time or Start/Stop Address.

Press key to switch to the Edit mode.

h
[Ex-1] START ADD: 10001
Move the Cursor to highlight the most significant digit.
i
[Ex-2] START ADD: 10001

• Press key to increase,

j
key to decreases the highlighted digit.
[Ex-3] START ADD: 12001

k Exit

PATH: Î Î Î Î Î Î Î Î

4-2 Model 381395 Version 1.0 January 2008

 4. Using the Data Logger

4.2. Start Data logger procedure

1. Insert the BLACK test lead in the input socket marked ‘COM’.
2. Insert the RED test lead in the input socket marked ‘CHA’.

3. Open the FUNCTION menu.

4. Use the arrow keys to highlight the DATA LOGGER

5. Set and Open the Data Logger.

Select to DCV function.

The DCV icon appears at the top-left corner of the display.

• Press key to change the Measurement Function:

6.
[Ex-1] DTYÆP/WÆRPMÆFRQÆBZÆOHMÆACVÆ DCV

• Press key to change the Measurement Function.

[Ex-2] DCVÆACVÆOHMÆBZÆFRQÆRPMÆP/WÆDTY

Select the auto-range function by pressing key or

use keys to select the desired range.

• Press key to change to a higher range.

[Ex-1] 000.1mVÆ0.001VÆ00.01VÆ000.1V
7.
• Press key to change the lower range.

[Ex-2] 000.1VÆ00.01VÆ0.001VÆ000.1mV

• Press key to choose the Auto-range (AT) mode

Press key to Start.

8.
Press this key again to Stop.
PATH: Î Î Î Î , or Î
9. Connect test leads to the source signal and observe the reading shown on the display. If
the input signal is beyond the allowed range, an overflow message “OL” will be displayed.

4-3 Model 381395 Version 1.0 January 2008

 4. Using the Data Logger

4.2.1. Changing the Measurement Function & Range

To change the Measurement Function and/or Range, perform the following.
Measurement Range change.

• Press the key to change to a higher range.

Or [Ex-1] 000.1mVÆ0.001VÆ00.01VÆ000.1V

• Press the key to change to a lower range.

[Ex-2] 000.1VÆ00.01VÆ0.001VÆ000.1mV
Measurement Function change.

• Press the key to change the Measurement Function:

Or [Ex-3] DTYÆP/WÆRPMÆFRQÆBZÆOHMÆACVÆ DCV

• Press the key to change the Measurement Function.

[Ex-4] DCVÆACVÆOHMÆBZÆFRQÆRPMÆP/WÆDTY

4.3. Recall Data

To recall data from the meter’s internal memory, perform the following:

c Open the FUNCTION menu.

d Use the arrow keys to highlight DATA LOGGER

e Set and Open the Data Logger.

f Press key to recall data.

• Press the key to scroll up

g or
• Press the key to scroll down.

PATH: Î Î Î Î ,

4-4 Model 381395 Version 1.0 January 2008

 5. Using the Digital Multimeter

5. Using the Digital Multimeter

5.1. The Digital Multimeter Displays

5.1.1. RECORD MODE

c Æ RECORD MODE Æ d Press to open Setup

PATH: Æ ÆSelects “RECORD MODE”Æ

In this mode, the meter records and displays maximum (MAX), minimum (MIN) and average
(AVG) values from measurements taken over a period of time.
(Real Time for MAX or MIN, elapsed time for AVG).

5.1.2. RELATIVE MODE

c Æ RELATIVE MODE Æ d Press to open Setup e Press to change Edit mode

PATH: Æ ÆSelects “RELATIVE MODE”Æ
In this mode, the meter records and displays reference (REF), difference (DIF) and error
(ERR) values from measurements taken over a period of time.
The relative mode measures to what degree the input value deviates from a reference value
(the deviation is displayed as a % error).
Difference (DIF) = Measured – Reference (REF)
Error (ERR %) = Difference / Reference x 100

5-1 Model 381395 Version 1.0 January 2008

 5. Using the Digital Multimeter

5.1.3. COMPARE MODE

c ÆCOMPARE MODE Æ d Press to open Setup e Press to change Edit mode

PATH: Æ ÆSelects “COMPARE MODE”Æ

In Compare mode, the meter determines if a measurement is within, above, or below a

designated range.
In this mode, the meter compares the input value to a high and low limit value. A -LO- is
displayed if the input value is lower than the low limit, PASS if the input value is within the
high and low limit values and -HI- if the input is greater than the high limit.

5.1.4. TREND PLOT

c Æ TREND MODE Æ d Press to open Setup e Press to change Edit mode

PATH: Æ ÆSelects “TREND PLOT”Æ

Displays the trend graph with the reference value as the center value.
[F1] SetUp: The Reference value, horizontal and vertical axis values (REF, H/Div, V/Div)
are displayed. The REF is the centerline value on the trend graph, H/Div is the X axis (time)
and V/DIV is the Y axis (amplitude).
[F3] Clear: Erase the graph on display.
[F4] Start: Starts the plotting using the REF value as the centerline.

5-2 Model 381395 Version 1.0 January 2008

 5. Using the Digital Multimeter

5.2. Measurement Procedures

z Voltage Measurements
CAUTION! Do not attempt to make a voltage measurement if a test lead is plugged in the CHB
or EXT.TRIG input jack, instrument damage and/or personal injury may result.

WARNING! 1. To avoid the risk of electrical shock and instrument damage, input voltages must
not exceed 1,000V DC or 600V AC rms.

2. Always keep fingers behind the finger guards on the probe when making
measurements.

5.2.1. DC V
z Applications
DCV: Voltage of batteries or DC circuits can be measured.
z Measuring ranges
4 ranges from 1,000mV to 1,000V
z Measurement procedure
1. Insert the BLACK test lead into the input socket marked as ‘COM’.
2. Insert the RED test lead into the input socket marked as ‘CHA’.
3. Open the FUNCTION menu.

4. Highlight Digital Multimeter (Record, Relative, Compare or Trend).

Open the selected item.

5.
In this example the Record mode is selected.

Select DCV function. The DCV appears at the top-left corner of the
display.

• Press key to change the Measurement Function:

6.
or [Ex-1] DTYÆP/WÆRPMÆFRQÆBZÆOHMÆACVÆ DCV

• Press key to change the Measurement Function.

[Ex-2] DCVÆACVÆOHMÆBZÆFRQÆRPMÆP/WÆDTY

5-3 Model 381395 Version 1.0 January 2008

 5. Using the Digital Multimeter

Select the auto-range function by pressing key or use

keys to select desired range.

• Press key to select a higher range.

or [Ex-1] 012.3mVÆ0.123VÆ01.23VÆ012.3V
7.
• Press key to select a lower range.

[Ex-2] 012.3VÆ01.23VÆ0.123VÆ012.3mV

• Pressing key will change the Range to Auto-range (AT)

PATH: Î Î Î or Î , or
8. Connect the test leads to the source signal and observe the reading shown on the display.
If the input signal is beyond the allowed range, an overflow message “OL” will be
displayed.

5.2.2. AC V
z Applications
ACV: Sine wave AC voltages used in the powering of appliances, lighting, and tools can be
measured.

z Measuring ranges
Four (4) ranges from 1,000mV to 750V.

z Measurement procedure
1. Insert the BLACK test lead into the input socket marked as ‘COM’.
2. Insert the RED test lead into the input socket marked as ‘CHA’.
3. Change the mode to Digital Multimeter. (skip this step if Digital Multimeter mode is set)
Path: Î Î (Record, Relative, Compare mode or Trend plot)
4. Select ACV with the or keys. The ACV appears at the top-left corner of the display
area.
5. Select the auto-range function by pressing key or use , keys to select the
desired range.
6. Connect test leads to the source signal and observe the reading shown on the display. If
the input signal is beyond the allowed range, an overflow message “OL” will be displayed.

Note.
The LCD will indicate the measured value in numeric and Bar graph displays.
If the voltage is too high, the measurement range will switch to the next higher range
automatically.

5-4 Model 381395 Version 1.0 January 2008

 5. Using the Digital Multimeter

5.2.3. Resistance
z Resistance Measurements
CAUTION! Do not attempt to make a voltage measurement if a test lead is plugged in to
the CHB or EXT.TRIG input jack, instrument damage and/or personal injury
may result.
WARNING! Turn off power and discharge all capacitors in the circuit to be tested before
making in-circuit resistance measurements. Accurate measurement are not
possible if external or residual voltage is present.

z Applications
Resistance of resistors and circuits can be measured.

z Measuring ranges
4 ranges from 5kΩ to 5MΩ.

z Measurement procedure
1. Insert the BLACK test lead into the input socket marked as ‘COM’.
2. Insert the RED test lead into the input socket marked as ‘CHA’.
3. Change the mode to Digital Multimeter. (skip this step if Digital Multimeter mode is set)
Path: Î Î (Record, Relative, Compare mode or Trend plot)
4. Select OHM with the and keys. The OHM icon appears at the top-left corner of the
display area.
5. Select the auto-range function by pressing key or use , keys to select the
desired range.
6. Connect test leads to the source signal and observe the reading shown on the display. If
the input signal is beyond the allowed range, an overflow message “OL” will be displayed.

5.2.4. Continuity
z Applications
Checking the continuity of wiring

z How to use:
1. Insert the BLACK test lead into the input socket marked as ‘COM’.
2. Insert the RED test lead into the input socket marked as ‘CHA’.
3. Change the mode to Digital Multimeter. (skip this step if Digital Multimeter mode is set)
Path: Î Î (Record, Relative, Compare mode or Trend plot)
4. Select BZ with the or key. The BZ appears at the top-left corner of the display area.

5-5 Model 381395 Version 1.0 January 2008

 5. Using the Digital Multimeter

5. Connect test leads to your source signal. The measured value will be shown on the

display automatically. The Meter “beeps” when measured resistance value is lower than

threshold value.

5.2.5. Frequency
CAUTION! Do not attempt to make a voltage measurement if a test lead is plugged in
the CHB or EXT.TRIG input jack, instrument damage and/or personal injury
may result.
WARNING! 1. Never attempt a frequency measurement with a voltage source greater
than 600V AC rms. Determine the voltage of any unknown frequency
source before connecting the instrument in frequency mode.
2. Always keep fingers behind the finger guards on the probe when making
measurements.

z Applications
Frequency of an AC circuit is measured.

z Measuring ranges [Full Auto Range]

Six (6) ranges from 100Hz to 10MHz

z Measurement procedure
1. Insert the BLACK test lead in the input socket marked ‘COM’.
2. Insert the RED test lead in the input socket marked ‘CHA’.
3. Change the mode to Digital Multimeter (skip this step if Digital Multimeter mode is set)
Path: Î Î (Record, Relative, Compare mode or Trend plot)
4. Select FRQ with the or key. The FRQ appears at the top-left corner of the display
area.
5. Connect test leads to the source signal and observe the reading shown on the display. If
the input signal is beyond the allowable range, an overload message “OL” will be display.

5.2.6. RPM
z Applications
RPM (rotations per minute) is measured.

z Measurement procedure
1. Insert the BLACK test lead in the input socket marked ‘COM’.
2. Insert the RED test lead in the input socket marked ‘CHA’.
3. Change the mode to Digital Multimeter. (skip this step if Digital Multimeter mode is set)

5-6 Model 381395 Version 1.0 January 2008

 5. Using the Digital Multimeter

Path: Î Î (Record, Relative, Compare mode or Trend plot)

4. Select RPM with the or key. The RPM appears at the top-left corner of the display
area.
5. Connect test leads to the source signal and observe the reading shown on the display.

5.2.7. Pulse Width

z Applications
Pulse Width is measured. [Auto Range]

z Measurement procedure
1. Insert the BLACK test lead in the input socket marked ‘COM’.
2. Insert the RED test lead in the input socket marked ‘CHA’.
3. Change the mode to Digital Multimeter. (skip this step if Digital Multimeter mode is set)
Path: Î Î (Record, Relative, Compare mode or Trend plot)
4. Select P/W with the or key. The P/W appears at the top-left corner of the display
area.
5. Connect test leads to the source signal and observe the reading shown on the display.

5.2.8. Duty Cycle

z Applications
Duty Cycle is measured.

z Measurement procedure
1. Insert the BLACK test lead in the input socket marked ‘COM’.
2. Insert the RED test lead in the input socket marked ‘CHA’.
3. Change the mode to Digital Multimeter. (skip this step if Digital Multimeter mode is set)
Path: Î Î (Record, Relative, Compare mode or Trend plot)
4. Select DTY with the or key. The DTY appears at the top-left corner of the display
area.
5. Connect test leads to the source signal and observe the reading shown on the display.

5-7 Model 381395 Version 1.0 January 2008

 6. System Setup

6. System Setup
Set Beeper, Auto Power off, BAUD Rate for USB, Time, Date and Contrast

6.1. Configure the meter’s audible beeper tone

ƒ The “BEEPER” can be set to be ON or OFF
ƒ The meter beeps when the factory settings are restored
ƒ When ON, an audible beep will sound when any front panel key is pressed
Path: Î SYSTEM SETUP Î

6.2. Auto Power Off

The Auto Power Off mode turns the meter off automatically after a period of 20 minutes of
inactivity. This feature is in place to conserve battery life.

6.3. Set the BAUD RATE (BPS) of USB

To change the BAUD Rate (BPS):

c Press ÆSYSTEM SETUPÆ to access SYSTEM SETUP

d Use the arrow keys to highlight “BAUD RATE(BPS):”.

e Set the item. (Fixed 115200)

f Exit

Path: Î Î Î

6-1 Model 381395 Version 1.0 January 2008

 6. System Setup

6.4. Changing the Current Date and Time

1) Set the Time and Date

1-1) Time: hh:mm:ss
1-2) Date: dd-mm-yy

c ÆSYSTEM SETUPÆ d Press to change Edit mode

6.4.1. Setting the Real-Time Clock

“TIME SET:” allows the user to set the real-time clock. Enter the time in 24 hour HH:MM:SS
format, using the keypad. Valid hour (HH) values are 00 to 23. Valid minute (MM) and
second (SS) values are 00 to 59.

To change the Current Time:

1. Press ÆSYSTEM SETUPÆ to open SYSTEM SETUP mode.
2. Select “TIME SET:” with the or key. So, the “Edit” appears at the bottom-left
corner of the display area.
3. Press key .
4. Press or key. The cursor indicates the selected digit. (hh:mm:ss)
5. Press , , or to set the time.
Move the blinking cursor left with the key and right with the key.
Pressing the key increases the value of the blinking digit.
Pressing the key decreases the value of the blinking digit.

6.4.2. Setting the Date

“DATE SET:” allows the user to set the date of the real-time clock. Enter the date in DD-MM-
YY format using the keypad. Valid year (YY) values are 00 through 99. Valid month (MM)
values are 01 to 12, and valid day values are 01 to 31.
To change the Current Date:
1. Press ÆSYSTEM SETUPÆ to open SYSTEM SETUP mode.
2. Select “DATE SET:” with the or key. So, the “Edit” appears at the bottom-left
corner of the display area.

6-2 Model 381395 Version 1.0 January 2008

 6. System Setup

3. Press key to change the Edit mode.

4. Press the or key. The cursor indicates the digit that is ready for edit. (dd:mm:yy)
5. Use the , , or keys to set the date.
Move the blinking cursor to the left with the key and to the right with the key.
Pressing the key will increase the value of the blinking digit.
Pressing the key will decrease the value of the blinking digit.

6-3 Model 381395 Version 1.0 January 2008

 7. Specifications

7. Specifications

7.1. General Specifications

z Operational Temperature:
+32°F to +122°F (0°C to +50°C)
z Operational Relative Humidity:
< 75%
z Storage conditions:
-4°F to 140°F (-20°C to +60°C); < 75%RH
z Temperature Coefficient:
0.1 x (Specified Accuracy) per °C for temperature <64.4°F (18°C) to >82.4°F (28°C)
z Max. Voltage Input and Ground:
DC or AC 600Vrms
z Basic DC Accuracy:
0.3%
z Scope Bandwidth
5 MHz
z Meter AC Bandwidth:
20 kHz
z Power Supply
Li-ION Battery 3.7V
z Battery Life:
4 Hours with Backlight OFF, 3 Hours with Backlight ON
z Battery Charge Time
3 Hours approx.
z Battery Charge information
Class-2 transformer, Input: 120-240V AC 50/60Hz, Output: 5V DC 1A
z Display Type:
Super-Twist 132 x 128 pixels
z Equipment Dimensions:
3.5”(90mm) width x 7.7”(195mm) depth x 1.6”(40mm) height
z Equipment Weight:
1.0 lbs. (480g) approx. without Holster

7-1 Model 381395 Version 1.0 January 2008

 7. Specifications

7.2. Technical Specifications

Note: Accuracy is specified for a temperature of 23°C ± 5°C (75°F ± 9°F) with the relative
humidity less than 80% for a period of one year after calibration.

7.2.1. The General Oscilloscope Function

z Horizontal
Sample Rate 50 MS/s (Single CH mode), 25 MS/s (Dual CH mode)
Record Length 512 in single shot mode, 256 in all other modes
Samples / Division 25
Update Rate Real Time
Modes Single shot, Roll, Normal
Accuracy 0.01%
Sweep Rate 1uS to 5S in 1, 2, 5 sequence

z Vertical
Bandwidth 5MHz
Resolution 8 Bit
Channels Dual
Coupling AC, DC

Input impedance 1 MΩ

Accuracy 3% ±1 Pixel
Max. Input Volts DC or AC 600Vrms
Volt / Division 50 mV to 500V in 1, 2, 5 sequence

z Triggering
Type CHA, CHB, External
Coupling AC, DC
Slope Rising (↑) or Falling (↓) edge
Internal Trigger
2 / 20 Division
Sensitivity

z Waveform Memory
Waveform Memory 16 Shots

7-2 Model 381395 Version 1.0 January 2008

 7. Specifications

7.2.2. The Data Logger Function

Data Logger Memory 17,000 Points
Sampling Modes Peak, Sampling Time
Sample Rate Max. 0.25S/s
Sampling interval From 1 second to 9,999 seconds
Clock Real Time Clock (RTC)

7.2.3. The Digital Multimeter Function

▪ Programmable: Record (MAX, MIN, AVG), Relative (REF, ERR), Compare (GO-NO/GO)
▪ Trend plot
z DC V
Scope V/Div DMM Range Resolution Accuracy Impedance
50m, 0.1, 0.2 1000mV 0.1mV
0.5, 1, 2 10V 0.001V ±(0.3%+3)
1 MΩ
5, 10, 20 100V 0.01V
50, 100, 200,1000 1000V 0.1V ±(0.5%+5)

z AC V
DMM Accuracy
Scope V/Div Resolution Impedance
Range 50~450Hz 0.45k~5kHz 5k~20kHz
50m, 0.1, 0.2 500mV 0.1mV
0.5, 1, 2 5V 0.001V ±(3.5%+5)
±(0.75%+5) ±(2%+5) 1 MΩ
5, 10, 20 50V 0.01V
50, 100, 200,500 750V 0.1V N/A *
* For Voltages > 200V in the range 5 kHz to 20 kHz, the accuracy is not specified

z OHM
Scope V/Div DMM Range Resolution Accuracy Impedance

1 kΩ 5 kΩ 0.001 kΩ

10 kΩ 50 kΩ 0.01 kΩ ±(0.5%+5)
600V DC or
AC rms
100 kΩ 500 kΩ 0.1 kΩ

1 MΩ 5 MΩ 0.001 MΩ ±(0.75%+10)

7-3 Model 381395 Version 1.0 January 2008

 7. Specifications

z Continuity Buzzer
Test Voltage Threshold Over Load Protection
1.7V 100 digits 600V DC or AC rms

z Frequency [Full Auto Range]

Range Resolution Accuracy Overload protection
100 Hz 0.01 Hz
1 kHz 0.0001 kHz
10 kHz 0.001kHz 600V DC
±(0.05%+5)
100 kHz 0.01kHz or AC rms
1 MHz 0.0001MHz
10 MHz 0.001MHz

z RPM
Range Resolution Accuracy
0 – 9,999 1 RPM ±(0.05%+5)

z Pulse Width [Full Auto Range]

Range 2uS-500mS (Pulse Width > 2uS)

z % Duty
Range 25% - 75%

7-4 Model 381395 Version 1.0 January 2008

 8. PC Interface Operation

8. PC Interface Operation

8.1. USB HID Device Installation

8.1.1. System Requirements

1) IBM or compatible Personal Computer (PC)

2) WindowsTM operating system
3) CD-ROM Drive
4) USB Port

8.1.2. Operating System

z Microsoft WindowsTM XP or above

8.2. PC USB port Connection

1) Connect the USB cable to the meter and to the PC
2) Press and hold the I/O key for 1 to 2 seconds to power the meter

8.2.1. Human Interface Device

When the meter is connected to the PC and then powered up, the PC should display
"Found New Hardware" and automatically install the Human Interface Device (HID) driver.
HIDs do not require a custom USB driver (HIDs are built into the WindowsTM operating
system).

8-1 Model 381395 Version 1.0 January 2008

 8. PC Interface Operation

8.3. Installing the WindowsTM Application Software

1) Insert the software CD into the CD-ROM drive of the PC.
2) Open Windows® Explorer and double-click the CD-ROM drive.
3) Auto Run or simply double click on Setup.exe

[Step 1: Choose Setup Language] [Step 2: Preparing to Install]

[Step 3: Welcome…] [Step 4: Ready to Install the Program]

[Step 5: Installing Software] [Step 6: Install Wizard Completed]

8-2 Model 381395 Version 1.0 January 2008

 8. PC Interface Operation

8.4. Running the Application Software

1) Connect the meter to the PC using the supplied USB cable.
2) Turn the Meter ON
3) Run the software

The Software window will open as shown below:

8.4.1. Oscilloscope Mode

1) Click the [LINK] Button and then the [Start] Button.

1
2
3

①LINK Button, ②Screen Print,

③Set the System Time and Date ④Start / Stop Button

8-3 Model 381395 Version 1.0 January 2008

 8. PC Interface Operation

Display Area

2
① Sampling Time (0.001 to 9999)
3
② Trigger level indicator (-T)
③ Trigger point indicator (T)

Control Panel Area

6 ④ Channel A (Vertical Position, Division,

Auto, ON/Off and DC coupling)
5
⑤ Channel B (Vertical Position, Division,
4 Auto, ON/Off and DC coupling)
⑥ Horizontal Division and Trigger
7 (Horizontal Division, Auto, Trigger
Level, Source and Position)
8 ⑦ Measurement Function (DCV, ACV, OHM,
BZ, Hz, RPM, Pulse Width and Duty)

⑧ Storing and Recalling Screens

8.4.2. DMM & Data Logger Mode

1) Click the [DMM & Logger] tap

① LINK Button, ② Start / Stop Button

8-4 Model 381395 Version 1.0 January 2008

 8. PC Interface Operation

2) Click the [Start] Button

Control Panel Area for DMM & Logger

① Sampling Time (0.001 to 9999)

2
② Primary Numerical Field (Data Logger
3 and DMM Function)

4 ③ Set the Measurement Function

④ Measurement Range
5 ⑤ Display Mode

Data Display Area for Data Logger

6 ⑥ Display the number of logged data

No., Time and the measured data.
7
(EOD: End of Data)
8
⑦ File Name
9 ⑧ Save the logged data to PC
10
⑨ Load the logged data from PC
11 ⑩ Saved File Type (Text or Excel file)
⑪ Print Button

8.4.3. Display Mode for DMM & Data Logger Mode

DATA LOGGER MODE RECORD MODE

z Sample Method:
Time: Sample (interval) Mode
Peak: Peak Detect Mode
z MAX / AVG / MIN: update only when a new
z Sample Time: Sampling interval time, 1Sec maximum/ average/ minimum value is
to 9,999Sec
detected.
z Start Address: Set the Start Address z Total Samples: Total quantity sampled data
z Stop Address: Set the Stop Address (to
z Elapsed Time: Total elapsed time
17,000)
- Reset: All data set to zero
- Set: Set Button for Data Logger
- Pause: Freezes the displayed value
- Clear: Erase for Logged data of display
- Hold: Freeze the screen at any time
- Recall: Displays stored readings and buffer
statistics
- Start: Start the Data Logger

8-5 Model 381395 Version 1.0 January 2008

 8. PC Interface Operation

RELATIVE MODE COMPARE MODE

z REF: Reference value

z DIF: Difference value, Difference = z HI Limit: Set value for HI limit
Measured value– Reference z LO Limit: Set value for LOW limit
z ERR: Error rate, ERR % = Difference / z Reading: Reading value
Reference x 100 z Pass Muster: Total passes
z Mean ERR: The mean error z Elapsed Time: Total elapsed time
z Elapsed Time: Total elapsed time
- SetUp: Open Setup mode for Compare mode
- SetUp: Open Setup mode for Relative mode - Reset: All data set to zero
- Reset: All data set to zero - Pause: Freezes the displayed value
- Pause: Freezes the displayed value - Hold: Freeze the screen at any time
- Hold: Freeze the screen at any time

TREND PLOT MODE

- Set: The Plot mode, Offset, Horizontal and

Vertical axis values are displayed.
- Clear: Erase the graph
- Start: Starts plotting the graph using the Offset
z Plot Mode: Line or Dot value as the centerline.
z Offset: The centerline value on the trend
graph
z V/Division: V/DIV is the Y axis (amplitude).
z H/Division: H/Div is the X axis (time)

8-6 Model 381395 Version 1.0 January 2008

 9. Maintaining the Meter

9. Maintaining the Meter

Warning!
z This section includes important safety information. Read and understand the following
instruction fully and maintain the instrument properly.
z The instrument must be calibrated and inspected at least once per year to maintain its
integrity, safety, and accuracy.

9.1. Section Overview

This section covers basic maintenance procedures that can be performed by the user and
also provides handling, cleaning, battery replacement, disassembly, and assembly
instructions.

9.2. Safe Static Handling

Observe the following rules for handling static-sensitive devices:
1. Handle all static-sensitive components at a static-safe work area.
Use grounded static control table mats and always wear a grounded wrist strap. Handle
boards by their nonconductive edges only; store plastic, vinyl, and Styrofoam objects
outside of the work area.
2. Store and transport all static-sensitive components and assemblies in static shielding
bags or containers. Static shielding bags and containers protect components and
assemblies from direct static discharge and external static fields. Store components in
their original packages until they are ready for use.

9.3. Cleaning the Meter

Warning!
To avoid electrical shock or damage to the meter, never allow water inside the case. To
avoid damaging the meter’s housing, never apply solvents to the meter.

If the meter requires cleaning, wipe it with a cloth that is lightly dampened with water or a
mild detergent. Do not use hydrocarbons, chlorinated solvents, or methanol-based fluids
when cleaning the meter.

9-1 Model 381395 Version 1.0 January 2008

 9. Maintaining the Meter

9.4. Storing the Meter

If the Meter is to be store for an extended period of time, charge the LI-ION battery pack
before storing. It is not necessary to remove the battery pack.

9.5. Calibration
The manufacturer may conduct the calibration and inspection. For more information, please
contact the manufacturer.

9.6. Replacing / Disposing of the LI-ION Battery

Warning!
To avoid electrical shock, remove the test leads and probes before replacing the battery
pack.
Caution
Handle the PCB Assembly by its edges or while wearing gloves.

Note
This instrument contains a LI-ION battery pack. Do not dispose of this battery pack with
other solid waste. Used batteries should be disposed of by a qualified recycler or hazardous
materials handler.

9-2 Model 381395 Version 1.0 January 2008

 9. Maintaining the Meter

9.6.1. To replace the battery pack

1. Remove the Meter Case

Use the following procedure to remove

3 PCS
S1
the meter case.

① Remove the test leads

Disconnect the test leads and probes

both at the source and at the meter.

② Power OFF

Make sure the meter is turned off and

unplugged from the power Adaptor.

③ Remove Screws:

Remove the three screws from the

bottom of the case. (3 pcs)

④ Remove the PCB Assembly:

Remove the PCB Assembly by

releasing the four snap retainers
2. Remove Rubber key and Battery Pack

Rotate the PCB Assembly 180 degrees.

① Remove the Rubber Key:

② Remove the Battery Pack:

Remove the battery plug from the

connector.

3. Install a new battery pack.

4. Reinstall the rear cover and secure the screws.

9-3 Model 381395 Version 1.0 January 2008

 10. Appendices

10. Appendices
10.1. Troubleshooting guide
If a meter problem arises, review the corrective actions below before concluding that the
instrument requires repair.

1. Ensure that a fresh Li-ION battery pack or fully charged rechargeable battery pack is used.
If using the AC/DC power adapter, ensure that the adapter is plugged into an appropriate
live power source.

2. If the keys do not respond to presses or if the display is unreadable, remove the power
source while the instrument is on and then restore operations after a 15 minute wait period.

3. If difficulties continue, check the connections.

4. If the meter’s display is frozen when trying to control the trigger level:
z In normal (NORM) mode, the trigger level must be the same level as the waveform.
The Meter does not trigger if the trigger level is set above or below the waveform level.
z In AUTO (AT) mode, the trigger level does not have to be adjusted.
z In rare cases the instrument may require servicing. There are no internal user-
serviceable parts.

10-1 Model 381395 Version 1.0 January 2008

 10. Appendices

10.2. LCD STATUS INDICATIONS BY FUNCTION

10.2.1. Function Menu & General Scope Mode

Function
Menu
&
General
Scope

Æ Æ (1) Æ Æ Æ

10.2.2. Data Logger Mode

Data
Logger

Æ Æ (2) Æ Æ Æ Æ Æ Æ Æ

10.2.3. Multimeter / Record Mode

Record
Mode

Æ Æ (3) Æ Æ Æ

10-2 Model 381395 Version 1.0 January 2008

 10. Appendices

10.2.4. Multimeter / Relative Mode

Relative
Mode

Æ Æ (4) Æ Æ Æ Æ Æ Æ Æ

10.2.5. Multimeter / Compare Mode

Compare
Mode

Æ Æ (5) Æ Æ Æ Æ Æ Æ Æ

10.2.6. Multimeter / Trend Plot Mode

Trend
Plot

Æ Æ (6) Æ Æ Æ Æ Æ Æ Æ

10-3 Model 381395 Version 1.0 January 2008

 10. Appendices

10.2.7. System Setup Mode

System
Setup

Æ Æ (7) Æ Æ Æ

10.2.8. Trigger Setup Mode

Trigger
Setup

Æ Æ (1)Æ Æ Æ Æ Æ

99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

Back to the Extech 381395 Product Page

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX 781.665.0780 - TestEquipmentDepot.com

10-4 Model 381395 Version 1.0 January 2008