NARDA

Sales & Support: Manufacturing Plant:

Safety Via Leonardo da Vinci, 21/23 Via Benessea, 29/B
Test 20090 Segrate (MI) - ITALY 17035 Cisano sul Neva (SV)
Solutions Tel.: +39 02 2699871 Tel.: +39 0182 58641
S.r.l. Socio Unico Fax: +39 02 26998700 Fax: +39 0182 586400
http://www.narda-sts.it

User’s Manual
EHP-50F
ELECTRIC AND MAGNETIC
FIELD PROBE - ANALYZER

From 1 Hz up to 400 kHz

SERIAL NUMBER OF THE INSTRUMENT

You can find the Serial Number on the bottom cover of the instrument.
The Serial Number is in the form: 000XY00000.
The first three digits and the two letters are the Serial Number prefix, the last five
digits are the Serial Number suffix. The prefix is the same for identical instruments, it
changes only when a configuration change is made to the instrument.
The suffix is different for each instrument

Document EHP50FEN-80106-1.69 – Copyright © NARDA 2018

NOTE:
® Names and Logo are registered trademarks of Narda Safety Test Solutions GmbH and L3 Communications
Holdings, Inc. – Trade names are trademarks of the owners.

If the instrument is used in any other way than as described in this User’s Manual, it may become unsafe

Before using this product, the related documentation must be read with great care and fully understood to
familiarize with all the safety prescriptions.

To ensure the correct use and the maximum safety level, the User shall know all the instructions and
recommendations contained in this document.

This product is a Safety Class III instrument according to IEC classification and has been designed to meet
the requirements of EN61010-1 (Safety Requirements for Electrical Equipment for Measurement, Control and
Laboratory Use).

In accordance with the IEC classification, the battery charger of this product meets requirements Safety Class
II and Installation Category II (having double insulation and able to carry out mono-phase power supply
operations)..

It complies with the requirements of Pollution Class II (usually only non-conductive pollution). However,
occasionally it may become temporarily conductive due to condense on it.

The information contained in this document is subject to change without notice.

KEY TO THE ELECTRIC AND SAFETY SYMBOLS:

You now own a high-quality instrument that will give you many years of reliable service.
Nevertheless, even this product will become obsolete. When that time comes, please
remember that electronic equipment must be disposed of in accordance with local
regulations. This product conforms to the WEEE Directive of the European Union
(2002/96/EC) and belongs to Category 9 (Monitoring and Control Instruments). You can
return the instrument to us free of charge for proper environment friendly disposal. You
can obtain further information from your local Narda Sales Partner or by visiting our
website at www.narda-sts.it .

Warning, danger of electric shock Earth

Read carefully the Operating Manual and its

Unit Earth Connection
instructions, pay attention to the safety symbols.

Earth Protection Equipotential

KEY TO THE SYMBOLS USED IN THIS DOCUMENT:

The DANGER sign draws attention to a potential risk to a person’s
DANGER safety. All the precautions must be fully understood and applied before
proceeding.
The WARNING sign draws attention to a potential risk of damage to the
WARNING apparatus or loss of data. All the precautions must be fully understood
and applied before proceeding.
The CAUTION sign draws attention against unsafe practices for the
CAUTION apparatus functionality.

NOTE: The NOTE draw attention to important information.

II Note and symbols

Contents
Page
Safety requirements and instructions…..........…….....………………… VI
EC Declaration of Conformity ..........................…………………………. VII
1 General information Page
1.1 Documentation......................................................….…….………….. 1-1
1.2 Introduction ……………….....................…………………..…………… 1-1
1.3 Configuration and Standard accessories........................................... 1-3
1.4 Optional accessories ..............................................…..…………….. 1-3
1.5 EHP-50F Main specifications..................................…………………. 1-4
1.6 Isotropic E&H field analyzer EHP-50F typical uncertainty
and Anisotropy………………………………………………………….. 1-5
1.6.1 Measurements uncertainty of EHP-50F……………………………. 1-5
1.6.2 Explication Notes……………………………………………............. 1-6
1.6.3 Measurements uncertainty of EHP-50F (Weighted Peak mode)… 1-7
1.7 Anisotropy………………………………………………………………… 1-8
1.8 Overload level………………………………………………….............. 1-11
1.9 EHP-50F panel...................................………..………………………. 1-12

2 Installation and use Page

2.1 Introduction…………….........................................…...………….….. 2-1
2.2 Preliminary inspection…….............................……...………………. 2-1
2.3 Work Environment………..........................…………..……………… 2-1
2.4 To return for repair…..…..................................……...………….….. 2-1
2.5 Equipment cleaning………..…….….................……...……………... 2-1
2.6 Power supply and battery recharging……………………................. 2-2
2.7 EHP-50F connected to a PC…………………………………………. 2-3
2.8 EHP-50F stand-alone mode….….…………………….……………… 2-3
2.9 EHP-50F with NBM-550…….………………………………………… 2-3
2.10 Battery management…………….…………………………………… 2-3
2.11 Avoiding measurement errors………………………………………. 2-4

3 EHP50-TS installation Page

3.1 Introduction…………………………………………………..………….. 3-1
3.2 Hardware requirements…………………………...………..…………. 3-1
3.3 Installing EHP50-TS Software………….…………….………………. 3-2

4 EHP50-TS software Page

4.1 EHP50-TS Applications……………………………………..…………. 4-1
4.2 EHP-50F Installation….…..….....…………………………..…………. 4-2
4.2.1 Main menu………………….………………………………………..… 4-2
4.3 Mode section.………………………………………………………….... 4-4
4.4 Span section……………...……………………………………………… 4-5
4.5 Standard………………………………………………………………..… 4-7
4.6 Data section…………………………………………………………..…. 4-9
4.6.1 Waterfall……………………………………………………………..… 4-13
4.6.1.1 Data recording……………………………………………………….. 4-17
4.7 Style section.…………………………………………………………..… 4-18
4.8 ICNIRP…………………………………………….…………………..… 4-19
4.9 IEEE………..…………………………………………………............... 4-21
4.10 Weighted Peal Function (Time Domain)…….…………………….… 4-23
4.10.1 Weighted Peak requirements……………………………………… 4-23
4.10.2 EHP-TS Settings..……………………………………….................. 4-24
4.10.3 Weighted Peak Mode……………………………………………….. 4-25
4.10.3.1 Noise indication……..…………………………………………….. 4-27

Contents III
5 EHP-50F Stand-alone mode Page
5.1 Stand-alone mode description………….………………….… 5-1
5.2 EHP-50F Data Logger…………………………………………. 5-2
5.2.1 Run EHP-50F Stand-alone mode software………………. 5-2
5.2.2 Use EHP-50F Logger……………………………………….. 5-5
5.2.3 EHP-50F battery charging………………………………….. 5-5

6 Update Firmware Page

6.1 Update firmware…………..……………………………………. 6-1
6.2 To run the update software..………………………………….. 6-1
6.3 To transfer data ………………………………………………… 6-1

7 Uninstalling software Page

7.1 Uninstalling EHP-TS Software ………………………..……... 7-1
8 Uninstalling USB-OC Page
8.1 Uninstalling driver for USB-OC……………..……………..….. 8-1
9 Accessories Page
9.1 Introduction………………….………………………………..... 9-1
9.1.1 Preliminary inspection……..…...…………………………... 9-1
9.1.2 Work environment….………………………………………… 9-1
9.1.3 Return for repair…………………………………………..…. 9-1
9.1.4 Cleaning…………………………………………………..….. 9-1
9.1.5 Power supply and battery chargers……………………..… 9-2
9.2 NBM-550 Controller and display Unit for EHP-50F……….. 9-3
9.3 USB-OC Optical USB Converter…………………………..... 9-5
9.3.1 Introduction…………………………………………………... 9-5
9.3.2 Installation………………………………………………….... 9-5

IV Contents
Figures
Figure Page

1-1 Block Diagram of the EHP-50F …………………. 1-2

1-2 3D mesh measurements of magnetic probe……. 1-8
1-3 EHP-50F axes……………………………………… 1-9
1-4 Overload level EHP-50F (B Field, RMS)………… 1-11
1-5 Overload level EHP-50F (E Field, RMS)………… 1-11
1-6 EHP-50F panel ........………...............………….. 1-12
3-1 EHP50-TS Installation…………………………….. 3-2
4-1 EHP50-TS Main Window…….…………………… 4-2
4-2 Defining frequency band through the PC mouse 4-5
4-3 Zoom window………………………………………. 4-6
4-4 Data section………………………………………… 4-9
4-5 Waterfall - Graph 2D………………………………. 4-13
4-6 Waterfall Main Window……………………………. 4-14
4-7 Waterfall - Graph 3D………………………………. 4-15
5-1 Shorting loop……………………………………….. 5-1
6-1 EHP-50F Upgrading Utility Main Window…….... 6-1
7-1 Uninstalling EHP50-TS……………………………. 7-1
8-1 Uninstalling USB-OC……………………………… 8-2
9-1 NBM-550…………………………………………… 9-3
9-2 NBM-TS software…………………………………. 9-3
9-3 Monitor Mode………………………………………. 9-4
9-4 XYZ Mode………………………………………….. 9-4
9-5 Spectrum Mode……………………………………. 9-4
9-6 Standard Mode (ICNIRP) ………………………… 9-4
9-7 Weighted Peak Mode……………………………… 9-4
9-8 Weighted Peak Marker……………………………. 9-4
9-9 USB-OC Adapters………………………………… 9-5

Tables
Table Page

1-1 Technical Specifications of the EHP-50F….….... 1-4

2-1 Autonomy of the battery…………………………… 2-3
9-1 Technical Specifications of the USB-OC……….. 9-5

Contents V
 SAFETY RECOMMENDATIONS AND INSTRUCTIONS

This product has been designed, produced and tested in Italy, and it left the factory in conditions fully
complying with the current safety standards. To maintain it in safe conditions and ensure correct use,
these general instructions must be fully understood and applied before the product is used.

• In case of devices permanently connected to the power supply, and lacking any fuses or other
devices of mains protection, the power line must be equipped with adequate protection
commensurate to the consumption of all the devices connected to it;
• Devices in Safety Class I, equipped with connection to the power mains by means of cord and plug,
can only be plugged into a socket equipped with a ground wire;
• Any interruption or loosening of the ground wire or of a connecting power cable, inside or outside the
device, will cause a potential risk for the safety of the personnel;
• Ground connections must not be interrupted;
• To prevent the possible danger of electrocution, do not remove any covers, panels or guards
installed on the device, and refer only to NARDA Service Centers if maintenance should be
necessary;
• To maintain adequate protection from fire hazards, replace fuses only with others of the same type
and rating;
• Follow the safety regulations and any additional instructions in this manual to prevent accidents and
damages.

VI Safety Consideration
 Dichiarazione di Conformità
EC Declaration of Conformity
In accordo alla Decisione 768/2008/EC, conforme alle direttive EMC 2014/30/UE, Bassa Tensione 2014/35/UE e RoHS
2011/65/UE, ed anche alle norme ISO/IEC 17050-1 e 17050-2.
In accordance with the Decision 768/2008/EC, compliant to the Directives EMC 2014/30/EU, Low Voltage 2014/35/EU
and RoHS 2011/65/EU, also compliant to the ISO/IEC standard 17050-1 and 17050-2

Il costruttore
The manufacturer narda Safety Test Solutions S.r.l. Socio Unico
Indirizzo
Address Via Benessea, 29 / B

I-17035 Cisano sul Neva (SV) - Italy

sulla base delle seguenti norme europee armonizzate, applicate con esito positivo:
based on the following harmonized European Standards, successfully applied:

EMC - Emissioni:
EMC - Emission: EN 61326-1 (2013)

EMC - Immunità:
EMC - Immunity: EN 61326-1 (2013)

Sicurezza:
Safety: EN 61010-1 (2010)

dichiara, sotto la propria responsabilità, che il prodotto:

declares, under its sole responsibility, that the product:

Descrizione SONDA ANALIZZATORE DI CAMPO ELETTRICO E MAGNETICO

Description ELECTRIC AND MAGNETIC FIELD PROBE - ANALYZER
Modello
Model EHP-50F
è conforme ai requisiti essenziali delle seguenti Direttive:
conforms with the essential requirements of the following Directives:

Bassa Tensione
Low Voltage 2014/35/EU
Compatibiltà Elettromagnetica
EMC 2014/30/EU
RoHS
RoHS 2011/65/EU
Cisano sul Neva, 20 April 2016 Egon Stocca
General Manager

EC Conformity VII
 This page has been left blank intentionally

VIII Safety Consideration

 1 - General information
1.1 Documentation The following documents are included in this Manual:
• A questionnaire to be sent to NARDA together with the apparatus
should service be required.
• A checklist of the Accessories included in the shipment.

This Manual includes description of EHP-50F standard and optional

accessories.

1.2 Introduction This section provides a general overview of EHP-50F Electric and
Magnetic Field Analyzer.
EHP-50F is a low frequency electric and magnetic isotropic field probe-
analyzer. It provides an advanced technology solution for field analysis in
the 1 Hz to 400 kHz frequency range in an extremely high dynamic range.
It includes X, Y and Z axes simultaneous measurements with a powerful,
built in, spectrum analyzer.

EHP-50F can be used either connected to NBM-550 portable field meter

or PC. Additionally, stand alone operation mode is provided for up to 24
hours continuous data collection.

EHP-50F includes a non volatile memory which stores frequency and level
calibration tables and an internal optical repeater which allows connection
to external devices through the optical fiber.

Spectral analysis, obtained through DSP (Digital Signal Processor), is

performed on eight different frequency Span values and displayed on the
PC monitor or NBM-550 .
Marker function is available to provide accurate field strength and
frequency measurement.

EHP-50F is managed internally with a microprocessor that controls all the

main functions, from the battery charging to the serial communication with
the DSP unit.
Electric or Magnetic field is picked up by three sensors on the X, Y and Z
orthogonal axes. A Digital/Analog conversion follows which transforms the
signal into numeric information processed by a Digital Signal Processing
unit.

Document EHP50FEN-80106-1.69 - © NARDA 2018

General Information 1-1
 EHP-50F is housed in a small cubic housing. The bottom side panel
includes an optical fiber connector, extension rod screw, battery charger
connector, ON/OFF button and Status LED.

Fig. 1-1 Block diagram of the EHP-50F Analyzer

The magnetic sensor system is composed by three magnetic loops

positioned orthogonal each other. The electric sensor system is composed
by three orthogonal parallel capacitors installed on opposite side of the
magnetic loops.

1-2 General Information

1.3 Configuration and The EHP-50F, Set for Stand-alone and PC use (P/N 2404/104), is supplied
Standard Accessories complete of the following items:

• EHP-50F Basic Unit

• AC/DC Battery Charger
• Cable, FO Duplex, RP-02, 10m;
• O/E Converter USB, RP-02/USB
• Optical Bridge Connector RP-02;
• Tripod Extension, 0.50m;
• Mini Tripod, Benchtop
• EHP50-TS software, CD-ROM including User’s Manual;
• Softcase for EHP;

1.4 Optional Accessories The following accessories may be ordered as options:

• TR-02A wooden tripod 1-2m with soft carrying bag;
• TT-01 telescopic mast (120-420 cm) with carrying bag;
• 8053-CC Rigid case;
• 8053-CA Car Adapter.

General Information 1-3

 1.5 EHP-50F Main When not differently specified the following specifications are
specifications referred to operating ambient temperature 23°C and relative
humidity 50%.

Table 1-1 Technical specifications of the EHP-50F Electric and Magnetic Field Analyzer
Electric Field Magnetic Field AUX input (MMCX Zin 1kΩ)
Frequency range 1 Hz ÷ 400 kHz
Measurement range (1) low range 5 mV/m ÷ 1 kV/m 0.3 nT ÷ 100 µT 30 nV ÷ 10 mV
high range 500mV/m ÷ 100 kV/m 30 nT ÷ 10 mT 3 uV ÷ 1 V
(146 dB) (150 dB) (150 dB)
Overload (high range) 200 kV/m (≤ 3 kHz) 20 mT (at 50 Hz) 2V
Dynamic range 106 dB 110 dB 110 dB
Resolution (2) 0.1 mV/m 0.1 nT 0.1 nV
1 mV/m Stand alone 1 nT Stand alone
Displayed average noise level (3)
Isotropic result 5 mV/m 0.3 nT
Single axis 3 mV/m 0.2 nT 30 nV
Flatness (@ 100 V/m, 3 µT, 1mV)
(5 Hz ÷ 40 Hz) ±0.35 dB ±0.50 dB ±0.35 dB
(40 Hz ÷ 300 kHz) ±0.35 dB ±0.35 dB ±0.35 dB
(300 kHz ÷ 400 kHz) ±0.35 dB ±0.50 dB ±0.35 dB
Anisotropicity (typ) 0.54 dB 0.12 dB ---
Linearity (referred to 100 V/m and 3 µT) 0.2 dB (1 V/m ÷ 1 kV/m) 0.2 dB (200 nT ÷ 10 mT) 0.2 dB (10 µV ÷ 1 V)
Internal memory Up to 24 hours regardeless the logging rate
Internal data logger 1 measurement every 30 or 60 seconds
Spectrum analysis method FFT
Time domain analysis method (4) ICNIRP 1998, 2010 and 2013/35/EU weighed peak analysis
Acquisition method Simultaneous three axis acquisition
SPAN 100 Hz, 200 Hz, 500 Hz, 1 kHz, 2 kHz, 10 kHz, 100 kHz, 400 kHz
(500Hz to 400kHz in Stand Alone mode)
Start frequency 1 Hz with SPAN 100 Hz; 1.2 % of the SPAN with wider SPAN
Stop frequency Equal to the SPAN
Immunity to E fields --- < 0.2 uT @ 20 kV/m ---
Immunity to H fields < 10 V/m @ 1 mT --- ---
Calibration (5) internal E2PROM
Typical temperature deviation
-8x10-3 dB/°C within -20 +23 °C
@ 55 Hz referred to 23°C -4x10-3 dB/°C within -20 +55 °C ---
+13x10-3 dB/°C within +23 +55 °C
(@ 50% of relative humidity when applicable)
Typical relative humidity deviation
+11x10-3 dB/% within 10 50 % -7x10-3 dB/% within 10 50 %
@ 55 Hz referred to 50% ---
+22x10-3 dB/% within 50 90 % +10x10-3 dB/% within 50 90 %
(@ 23 °C)
Dimensions 92 x 92 x 109 mm
Weight 550 g
Tripod support Threaded insert ¼”
Environmental protection IP42
Internal battery 3.7 V / 5.4 Ah Li-Ion, rechargeable
Operating time >9 hours in standard mode
24 hours in stand alone mode
Recharging time < 6 hours
External supply 10 ÷ 15 VDC, I = approx. 500 mA
Optical fiber connection Serial Optical Interface 38400 Baud - RP02 connector up to 40 m (USB-OC)
Firmware updating through the optical link by USB or RS232
Self test automatic at power on
Operating temperature -20 to +55 °C
Operating relative humidity (6) 0 to 95 %
Charging temperature 0 to +40°C
Storage temperature -30 to +75°C
(1) For each single axis. Ranges to be selected manually
(2) For the lower measurement range
(3) DANL is frequency and SPAN depending. The specified best performance is referred to f ≥ 50 Hz and SPAN ≤ 1 kHz
(4) The FPGA operates in the time domain, implementing the hardware filters exactly as if the analog signal were passing through a chain of RC filters, being able to reconfigure poles and
zeroes to adapt to legislations.
(5) Recommended re-calibration interval 24 month
(6) Without condensation
Specification are subject to change without notice

1-4 General Information

1.6 Isotropic E&H field The uncertainties have been determined according to EA-4/2 [4] and are
analyzer EHP-50F expressed as relative values.
uncertainty They were estimated as expanded uncertainty obtained multiplying the
and anisotropy standard by the coverage factor k=1.96, corresponding to a confidence level
of about 95%.

1.6.1 Measurements The total uncertainty derived from contributions of linearity, anisotropy,
Uncertainty of EHP-50F frequency response, temperature, relative humidity and with/without
(Spectrum mode) contribution of uncertainty of calibration.

Total expanded uncertainty (k=1.96)

Magnetic flux
Magnetic probe (1) density Without contribution of With contribution of
range uncertainty of calibration uncertainty of
UT EHP50F (%) calibration UTOT (%)

50 nT to < 100 µT 2.4 3.1 (2)

Frequency at 50/60 Hz
100 µT to 3000 µT 2.6 4.3 (4)

Frequency from 5 to 40 Hz 50 nT to 10.0 µT 5.2 5.9 (3)

Frequency from 40 Hz to 100 kHz 50 nT to 10.0 µT 4.8 5.6 (3)

Frequency from 100 to 400 kHz 50 nT to 10.0 µT 7.5 8.1 (3)

(1) This uncertainty budget is for an ambient temperature of (23 +/- 4) °C, and relative humidity of (50 +/- 5) %
The expanded uncertainty for magnetic flux density for values close to 50 nT is calculated with negligible contribution
of noise level.
(2) The expanded uncertainty of calibration U Cal used is 2,0%

(3) The expanded uncertainty of calibration U Cal used is 3.0%

(4) The expanded uncertainty of calibration U Cal used is 3.5%

Total expanded uncertainty (k=1.96)

Electric probe (5) Electric field Without contribution of With contribution of
range uncertainty of calibration uncertainty of
UT EHP50F (%) calibration UTOT (%)

1 V/m to 1000 V/m 6.9 7.5 (6)

Frequency at 50/60 Hz
1 V/m to < 40 kV/m 7.6 8.1 (6)

Frequency from 5 Hz to 100 kHz 1 V/m to < 1000 V/m 8.8 10.3 (7)

Frequency from 100 to 400 kHz 1 V/m to < 1000 V/m 9.4 10.8 (7)

(5) This uncertainty budget is for an ambient temperature of (23 +/- 4) °C, and relative humidity of (50 +/- 5) %
(6) The expanded uncertainty of calibration U Cal used is 3.0%

(7) The expanded uncertainty of calibration U Cal used is 5.5%

General Information 1-5

1.6.2 Explication Notes a) If we have the certificate with different values of the uncertainty of
calibration, in order to calculate the total expanded uncertainty UTOT ,
the uncertainty of calibration has to be taken into account:

U TOT = 1 . 96 ⋅ (u T EHP 50 F
) + (u )
2
Cal
2

where uT EHP 50 F
is the standard uncertainty
( uT EHP 50 F
= UT EHP 50 F
/ 1.96 )
uCal is the standard uncertainty
( uCal = U Cal / k )
where U Cal is the expanded uncertainty reported on certificate
and k is the coverage factor reported on certificate (normally
k=2 or 1.96)

This quadratic sum is considered a precaution because the

uncertainty uCal is added quadratically to an uncertainty that is
already a combined uncertainty.

b) When the environmental temperature is higher than 23 °C, the contribute

due to the temperature can be added quadratically to the uncertainty.

Example: for magnetic measurements, if the temperature is 43°C, we get a

variation of 20°C in comparison to 23°C, corresponding to a variation of
0.26 dB ( 0.013 dB / °C ) equivalent to 3,04% and therefore, assuming a
rectangular distribution of probability, the standard uncertainty is 1.755%
( = 0,0304 / 3 ).

Assuming an expanded uncertainty UTOT =2.4%,

2
 0 . 024 
U ' TOT = 1 . 96 •   + (0 . 01755 )2 ≅ 0 . 042 is obtained.
 2 

The quadratic sum is considered a precaution because the uncertainty due

to temperature, is added quadratically to an uncertainty that is already a
combined uncertainty.

A similar calculation can be made in case the relative humidity overcomes

50%.

1-6 General Information

1.6.3 Measurements The total uncertainty derived from typical contributions of linearity,
Uncertainty of EHP-50F anisotropy, the worst case deviation from the nominal weighting filter,
(Weighted Peak mode) temperature and relative humidity.

Magnetic probe Total expanded uncertainty %

Frequency from 15 Hz to 100 kHz 4.6

Frequency from 10 Hz to 300 kHz 7.1

Frequency from 3 Hz to 300 kHz 8.6

Electric probe) Total expanded uncertainty %

Frequency from 15 Hz to 250 kHz 8.3

Frequency from 3 Hz to 300 kHz 9.7

Note: below 3 Hz and above 300 kHz the uncertainty increases to 0.85 dB (band limiting filter not considered).

General Information 1-7

1.7 Anisotropy 1) The IEEE 1309 [3] defined the anisotropy (A) as the maximum deviation
from the geometric mean of the maximum response and minimum response
when the probe is rotated around the ortho-axis (e.g. "virtual handle") as
shown in the example in figure below.

 S max 
A = 20 ⋅ log 10   dB equation (1)
 S max ⋅ S min 
 
where S is the measured amplitude in field strength units.

2) The IEC 61786 [2] "Measurement of low-frequency magnetic and electric

fields with regards to exposure of human beings - special requirements for
instruments and guidance for measurements" doesn't define the anisotropy
and suggests, for three-axis probes, the calibration of each axis when each
element is aligned with the incident field.
The calibration should also be checked for a specific orientation where
approximately there is the same indication for each one of the three axis
(XYZ measurement).
Following this suggestion some laboratories find the minimum and the
maximum values of the X,Y,Z and XYZ measure and calculate the
anisotropy using equation (1).

3) We calculated the anisotropy with equation (1) but with 3D mesh

measurements to cover 4π steradians, that is to say in a much more severe
condition than the orthotropic one.

Fig. 1-2 3D mesh measurements of magnetic probe

Each x marker in the fig.1 indicates the coordinates surface of the spherical
coordinates (r, θ, ϕ).
The anisotropy is evaluated with 30 degrees steps for θ and ϕ , and r
shows the calibration factor at each position.
The typical value of anisotropy is 1,4% (0.12 dB) for magnetic probe and
6,5% (0,54 dB) for electric probe.
The anisotropy calculated in this way is worse respect to other cases above
described and it is more representative of the reality.

1-8 General Information

A good evaluation of the anisotropy of a field probe should be carried out in
a place where all of the following conditions are satisfied:
Far Field
Plane wave
Uniform field

Since the calibration systems are not infinite, these conditions can be
approximated but never reached, and so the evaluation of anisotropy for
our probes shows results worse than the reality. So, the real typical
anisotropy response is better than what specified.

EHP-50F is housed in a small cubic case. The bottom side panel includes
an optical fiber connector, extension rod screw, battery charger connector,
ON/OFF button and Status LED.

Fig. 1-3 EHP-50F axes

The sensitive elements are located approximately 9 mm below the external
surface

General Information 1-9

 As depicted above, the magnetic sensor system is composed by three
magnetic loops positioned orthogonal each other. The electric sensor
system is composed by three orthogonal parallel plates capacitors installed
on the opposite side of the magnetic loops.

The geometric structure of the Narda probes, with sensors placed on the
peripheral faces of the cube, shows the same behavior as one with the
sensors accumulated in the center, when measuring far fields.
Moreover, this provides the opportunity to evaluate also very nearby fields,
albeit with all the limitations that this entails, knowing exactly where the
single sensor is, and allowing to minimize the contribution of the others.

References

[1] ISO/IEC “Guide to the expression of uncertainty in measurement” JCGM 100:2008 GUM 1995
with minor correction – International Organization for Standardization.
[2] CEI-IEC 61786-1 ed. 1.0 “Measurement of DC magnetic, AC magnetic and AC electric fields from
1 Hz to 100 kHz with regard to exposure of human beings – Part 1: Requirements for measuring
instruments.
[3] IEEE Std 1309™-2005 (revision of IEEE Std 1309-1996) “IEEE Standard for Calibration of
Electromagnetic Field Sensors and probes, Excluding Antennas, from 9 kHz to 40 GHz”.
[4] EA European co-operation for Accreditation – Public Reference EA-4/02 M:2013

1-10 General Information

1.8 Overload level

Fig. 1-4 Overload level EHP-50F (B Field, RMS)

Fig. 1-5 Overload level EHP-50F (E Field, RMS)

General Information 1-11

1.9 EHP-50F Panel

Key:

1. Led
2. Battery charger connector
3. ON/OFF button
4. AUX input connector MMCX
male type
5. Fiber optic connector

Fig. 1-6 Panel of EHP-50F

1-12 General Information

 2 - Installation and use
2.1 Introduction This section provides the information required for installing and using the
EHP-50F Analyzer.
Information is included regarding initial inspection, power requirements,
interconnections, work environment, assembly, cleaning, storage and
shipment.

2.2 Preliminary Inspect the packaging for any damage.

inspection
If the packaging or anti-shock material have been damaged, check
that the contents are complete and that the meter has not suffered
electric or mechanical damage.
Check that all the Accessories are there against the checklist found
with the apparatus.
Inform the carrier and NARDA of any damage that has occurred.

2.3 Work environment The work environment of the Accessories, must come within the following
conditions:
• Temperature From -20°C to +55°C
• Humidity 0 to 95% relative

The meter must be stored in a clean and dry environment, free from acid
dusts and humidity.
The storage environment must come within the range of the following
conditions:
• Temperature From -30°C to + 75°C
• Humidity < 100% relative without condense

2.4 To return for repair When the meter needs to be returned to NARDA for repair, please
complete the questionnaire appended to this User’s Manual, filling in all the
data that will be useful for the service you have requested.
For reducing the period of time required for the repairs, it is necessary to
be as specific as possible in describing the problem. If the problem only
occurs in certain circumstances, please describe in detail how it happens.
If possible it is better to reuse the original packaging; making sure that the
apparatus is wrapped in thick paper or plastic.
Otherwise, use strong packaging by using a sufficient quantity of shock
absorbent material around all sides of the meter to ensure that it is
compact and does not move around inside the package.
In particular, take every precaution to protect the front panels.
Finish the package by sealing it up tightly.
Apply a FRAGILE label to the package to encourage greater care in its
handling.

Nowadays there are restrictions on the shipment of hazardous materials,

eg. some types of lithium batteries.
Please, check the proper, safe, shipping mode, with the help of your
courier, in the case the product is equipped with batteries.

2.5 To clean the meter Use a dry, clean and non-abrasive cloth for cleaning the meter.

Do not use solvents, acids, turpentine, acetone or other similar

products for cleaning the meter in order to avoid damaging it.

Document EHP50FEN-80106-1.69 - © NARDA 2018

Installation and use 2-1
2.6 Power supply and EHP-50F has an internal rechargeable Li-Ion battery that can be recharged
battery recharging with the battery charger supplied with it.

Make a full charging cycle before using the Analyzer for longest battery
operation time.

ALWAYS connect the battery charger to the power supply BEFORE

connecting it to the EHP-50F.
The battery charger has an internal protective circuit that will limit the
output of current if there is any load when connecting to the mains.
Always remove the shorting loop connector when recharging EHP-
50F.
Battery charger:
output: DC, 10 - 15 V, ~ 500 mA
- +
Connector:
In order to safeguard the features of the batteries, it is crucial to have
a complete recharge before storing them for periods longer than 4
months. Therefore, it is warmly suggested recharging the batteries at
least every 4 months even though the device has not been used.

The minimum voltage level for operation is about 3.25V. The batteries
must be recharged for lower voltages. Below such voltage the
analyzer will turn OFF automatically.

The time required for recharging the batteries is about 4-5 hours.
When the recharge is complete, this is indicated by the Led of the
EHP-50F, with a rapidly blinking Green light.

To take measurements ALWAYS remove the battery charger from the

EHP-50F Analyzer otherwise the system does not work.

The battery status is reported by the EHP-50 control program

When charging is in progress the connection to the probe is not available.

2-2 Installation and use

2.7 EHP-50F connected Using the EHP50-TS software spectrum analysis can be displayed on a
to a PC PC
(see chapter 3 and 4).
2.8 EHP-50F stand alone The EHP-50F offers a Stand-alone mode of operation and thanks to its
Mode internal memory is possible to perform a long term acquisition without
connecting it to any external device.
With EHP-50F is possible to collect data every 1 minute or every 30
seconds for 24 hours. Later on, it is possible to download all collected data
to any PC by using the provided EHP50-TS PC software (see chapter 5).

2.9 EHP-50F with EHP-50F is linked to NBM-550 via the fiber optic link.
NBM-550

See NBM-550 Manual for further details

2.10 Battery The Table summaries the battery autonomy of the Analyzer depending on
management its mode of operation.

TABLE 2-1 Autonomy of the battery

STAND ALONE MODE
Normal functioning 30s Sample 60s Sample
Span
Autonomy (hours)
100 Hz >10 --- ---
200 Hz >10 --- ---
500 Hz >9 >24 >24
1 kHz >9 >24 >24
2 kHz >8 >24 >24
10 kHz >8 >24 >24
100 kHz >8 >24 >24
400 kHz >8 >24 >24

Installation and use 2-3

2.11 Avoiding To avoid disturbing the measurements in progress, the user or other
measurement errors persons or mobile vehicles should stay at least 5 meters away from the
Analyzers. We also recommend that the probe be set up a long way from
metal objects or masses.

To perform correct measurements, the tripod TR-02A to hold EHP-50F

is mandatory. Using an unsuitable support could influence the
measurements that have been taken and, therefore, determine
incorrect results. We recommend always using the isolated extension
support supplied with EHP-50F for supporting the Analyzer.
We also recommend that the TR-02A optional tripod be used for
positioning EHP-50F at the height set out in the reference standards
for the measurement in progress and that this configuration is always
maintained so that the measurements taken can be repeated.

The intensity of the measured field mainly depends on its voltage and
the geometry of the system under examination as well as the distance
between the conductors and the measurement points. In the vicinity
of cables, the reading of the field value may be very high and vary
with the location of the probe.
From the definition of the potential difference between to points:
r2
V 21
= −  E dr
r1
It is evident that, keeping the potential difference constant as the
distance between the two points under examination decreases, the
intensity of the field necessarily increases.
For example: the intensity of the electric field between two armatures
of a parallel-plate capacitor situated at a distance of 0.1 m and having
a potential difference of 100 V is equal to:
100V
E= = 1 KV
0,1m m
It should be noted that a voltage of 100 V, in these conditions,
generates a field of 1000 V/m. It is, therefore, possible, in the vicinity
of 220 V conductors, that there may be a field, which is much higher
than 220 V/m.

2-4 Installation and use

 3 – EHP50-TS installation
3.1 Introduction EHP50-TS is a useful software tool developed for remote PC control,
through fiber optic link, of EHP family Electromagnetic field analyzers.

By means of the recently introduced USB-OC optical to USB converter,

EHP-50F can be connected to a PC USB port.

Using the former optical/RS232 adapter, the selected COM port should be
assigned to the application software (see cap.5 EHP50-TS applications).

EHP50-TS software requires that at least one of the mentioned analyzers

is connected to PC in order to run.

The EHP50-TS installation program automatically installs the driver for

USB optical converter.

3.2 Hardware Minimum requirements:

requirements
• Processor: Pentium or equivalent
• 256 MB RAM
• At least 64 MB of free space on hard disk
• 1 free USB or RS232 port
• Windows Operating system™ XP/Vista/Win7/Win8/Win8.1/Win10

The User might have the need of administrator privileges to install

and run the software in Windows Vista, Win7, Win8, Win8.1 and
Win10; for further information see the next paragraph.

EHP50-TS software does not work with EHP50A/B.

The EHP-50F requires an EHP50-TS software version 1.61, included in

the EHP-TS software setup version 1.64 or later.

The new releases can be downloaded directly from the narda website.
http://www.narda-sts.it
1

Document EHP50FEN-80106-1.69 - © NARDA 2018

EHP-TS software 3-1
3.3 Installing EHP50-TS Before connecting the EM field analyzer to PC the EHP50-TS software
Software installation should be performed:
Insert the EHP50-TS CD into the driver of your PC and run the file “EHP-50
Setup.exe”.

The User must have administrator privileges to install the EHP-TS

software in Windows Vista, Win7, Win8, Win8.1 and Win10; right click
on the program .exe file and click on “Run as administrator” to
temporarily run the program or application as an administrator until
close it (Win7, Win8, Win8.1 and Win10 also allows to mark an
application so that it always runs with administrator rights).

Follow set-up program instructions

Fig.3-1 EHP50-TS installation

3-2 EHP-TS software

EHP-TS software 3-3
 When asked for, reboot your system to complete installation

EHP50-TS software is now installed in your PC, you can remove it, if
needed, simply running the “Uninstall EHP50-TS” application (see cap.8).

3-4 EHP-TS software

 4 – EHP50-TS software
4.1 EHP50-TS EHP50-TS software includes different applications to be used with EHP
Applications family analyzers. Shortcuts are shown, selecting “all programs” from the
windows XP “start” button or, using Windows Vista, Win7, Win8, Win8.1
and Win10 by clicking Windows ( ) and Programs:

The EHP50-TS section includes three different applications:

Dongle Utility: allows to enable the function ordered such Options using
the 40 Digit Activation Code received from NARDA Italy.

EHP50 – Stand Alone Mode: main task of this program is to set up EHP-
50F for standalone mode. The analyzer will take and log E or H field
measurements (according to the setting) for up to 24 hours, when switched
on without any connection to external devices (see operating manual for
details). Using EHP-50-Stand Alone mode program is then possible to
download measurement results and store them as a text file.

EHP-50C Update Firmware: this is a tool to update EHP-50C firmware.

EHP-50D – EHP50E Update Firmware: this is a tool to update the

firmware and FPGA of the EHP-50D and EHP-50E.

EHP-50F Update Firmware: this is a tool to update the firmware and

FPGA of the EHP-50F.

EHP50-TS: this program is used to perform live Time Domain and

Spectrum Analysis measurements when an EHP-50F analyzer is connected
to PC

The User might have the need of administrator privileges to install and
run the software in Windows 7, Win8, Win8.1 and Win10; for further
information see the paragraphs in Chapter 3.

EHP50-TS software does not work with EHP50A/B.

If the battery charger is plugged in to the EHP-50F while the software

is running, the analyzer will be disconnected.

During the charging process, always remove the bridge (stand-alone)

connector from the EHP-50F
1

Document EHP50FEN-80106-1.69 - © NARDA 2018

Description 4-1
4.2 EHP-50F This chapter describes controls and functions provided by the EHP50-TS
Installation application for time domain and spectrum analysis, included in EHP-TS
software package.
To install EHP-50F, connect the supplied fiber optic to the OPTIC LINK
connector taking care that the spigot matches the housing. Connect the
other end of the fiber optic to the OPTIC LINK connector of the USB-OC or
8053-OC. Connect the converter to a port of the PC.

Do not pull the fiber optic by holding onto the cable but use the
connector so that the head does not get damaged.
Avoid dirt and other particles getting into the transducers of the fiber
optic.

4.2.1 Main menu Turn on EHP-50F by pushing the Red POWER button for one second
(ORANGE LED for about 1 second is shown on button press). After that,
the led turns off for 2 seconds, lights orange for about ½ second as an auto-
check and then blinks red.
Communication with PC is shown by the blinking GREEN LED.
Run EHP50-TS application; a welcome screenshot will appear for a few
seconds.

Pressing the POWER down button for more than 4 seconds forces the
hardware of the apparatus to shut down. Then, it is necessary to wait
several seconds before switching it on again.

EHP-50F must be ON before running EHP50-TS control software.

EHP-50F may not be correctly recognized if switched ON when the
control software is already running.

The fiber optic of the EHP-50F can be disconnected and reconnected

while in use. In this case, communication will be restarted
automatically.

If the stored Firmware and/or FPGA version is older than what is

available, the software will inform you that an update is needed.
Confirm with OK and the Firmware/FPGA updating utility will be
automatically run (for further information please see chapter 7).

Fig.4-1 EHP50-TS Main Window

4-2 Description
Otherwise the program EHP50-TS main window will be shown:

Description:

1 - EHP50-TS software release, (communication port)

2 - Shows unit
3 - Click “?” to display EHP-50F analyzer information
4 – Name and trace of selected Limit
5 - EHP-50F analyzer battery status
6 - Scan activation for each axis (default setting: all axis activated)
7 - Hold When Done: stops acquisition to allow data analysis as soon as
all
axis have been measured
8 - Show X-Y-Z: to display or not the traces of single axis.
9 - Acquisition mode selected (see Mode section)
10 - Dynamic range (chosen between 120 and 140dB)
11 - Exit button to terminate application
12 - Control panel
13 – Display for time domain / spectrum analysis

Commands are grouped in the control panel in 5 different sections:

Mode: to set different operating modes

Span: to select a specific frequency span and, within the selected span, to
set zoom function

Standard: to create and save limit traces, to activate a specific limit

Data: to display measurement results and save data

Style: to change colour and button aspect

Each section can be activated with a mouse click.

Description 4-3
4.3 Mode section Mode section allows setting different acquisition modes, including
Frequency and Time domais choice, as well as defining Electric, Magnetic
field, or both in the same graph, and preferred Unit.

Function: measurements are displayed in different acquisition modes:

Spectrum: Frequency Domain sweeps are shown; display is continuously
updated with new readings.

Weighted Peak: Time Domain shows a continue running graph over the
specified period. This is a rolling peak. Once the first time period has been
completed, oldest data are discarded and replaced by the newest ones,
thus showing the values of the latest time period as specified.

Input/Range: to select electric, magnetic or dual mode field

(contemporary displaying of both Electric and Magnetic fields) in two
different ranges. Dual (Low Range) shows Electric and Magnetic field which
full range values are 1kV/m and 100μT respectively. Full scale ranges of
Dual (High Range) are therefore 100kV/m and 10mT
The EHP-50F is also equipped with an AUX Input (MMCX connector,
Zin 1 kΩ) for two different ranges. Aux (Low Range) shows fields which full
scale value is 10 mV. Full scale of Aux (High Range) is therefore 1 V.

Unit: to select unit according to the Input setting. Electric field can be
expressed in V/m and % of the limit only while Magnetic field can be
expressed in A/m, μT (magnetic induction), mG or % of selected limit. Dual
mode units are always V/m and A/m.

The unit “%” can be selected only if a Limit has been activated. Each
spectrum line will then represent the field strength expressed as
percent of the selected limit.

4-4 Description
4.4 Span section

EHP-50F includes an FFT analyzer to show frequency spectrum of

measured field. The span section includes the following:

Span: select one of the 8 available spans, keeping in mind that beside the
EHP-50F minimum operating frequency of 1 Hz, the minimum start
frequency of each Span is 1,2% of Span. For example, selecting 1 kHz
span the minimum start frequency should be 12 Hz (automatically adjusted
to the nearer step available of 12.5 Hz).This to avoid that the 0Hz signal,
common to every spectrum analyzer, is included in the measurement result.
Start frequency of 100 Hz and 200 Hz span is therefore 1 Hz (minimum
operating frequency).

Zoom: EHP-50F performs selective measurement over the entire frequency

range defined by the Span setting. EHP50-TS is able to select data in order
to display a user specified frequency band within the selected span. For this
purpose, the Zoom function can be set by typing the relevant parameters
through the PC keyboard or, graphically, by means of the PC mouse.
Within the selected frequency span, you can operate a zoom function to
define a specific frequency range over which perform your measurement.
For this purpose Start, Stop, Center and Span can be set to easily define
frequencies to be displayed. The Full Span button deactivate the Zoom
function showing the whole Span selected.

Right click and drag on the graph window to define graphically the
Zoom frequency range.

Fig.4-2 Defining frequency band through the PC mouse

Description 4-5
 Fig.4-3 Zoom window

Also choosing the best scale range 120 dB or 140 dB can be helpful to
better distinguish signals and disturbances.

Sweep: the two radio buttons in this box allow the user to select the Linear
or Logarithmic frequency scale.
Logarithmic scale is used to emphathise and clearly display low
frequencies even thow high ones are included in the graph. High
frequencies are therefore compressed to the high side of displayed range.

4-6 Description
4.5 Standard Standard section allows the user to select standard ICNIRP, IEEE, BGV
and EC limits, already included by the software installation, as well as
user’s limits which can be created through the “Make Limit” function
provided by this section.

Safety Standard: This section can be used to load a default standard limit
saved into the memory at the factory. Default limit list shows limits that are
compatible to the actual setting only. If Electric field was selected in the
Mode section, electric field limits only are displayed. No default limit is
shown in case mG unit was selected.

User Defined: This section allows to select and activate a specific limit
among limits created and saved by the user. They can be Linear or Non
Linear (governed by a mathematic formula).

The Edit Limit button opens a window to edit linear limits and create new
ones:

Description 4-7
 Type frequency and field strength for each point of the required limit and
click save to save it under the program directory. The limit file will be
created
as a linear interpolation between specified points.

When the ICNIRP or IEEE limit is selected, the software automatically

calculates the corresponding total integration of the measured
signals, and compares the result with the threshold set by the
standard, considering whether it is or is not exceeded.

The Edit Non Linear Limit button opens a window to edit those limits that
are related to a mathematic formula, and create new ones:

Click Load to edit a previously saved limit.

Type in the Start and Stop frequencies in the appropriate boxes, and
choose the right measurement Unit.

Introduce the strenght Value and choose its Unit.

Then choose the formula from the list and type the exponent value.

Click save to save it under the program directory. The limit file will be
created as a calculation of the mathematic expression.

The Max Hold function is not available when the ICNIRP or IEEE limit
is selected.

4-8 Description
4.6 Data section Even if EHP-50F takes measurement over the entire selected span, shown
results are related to the displayed spectrum only, allowing thus detailed
evaluation of user defineable frequency range through the zoom function.

Fig.4-4 Data section

The gray band on the left side of the graph highlights signals below the
minimum start frequency (1,2 % of Span) which are affected by residual
0 Hz peak. Calculation of Wideband result does not include any spectral
line within the gray band.

Measurement result: the following values are shown in a table form:

Highest Peak: Maximum value within the displayed spectrum.

Showed parameters:
Highest Peak field strength in the selected Unit (V/m in the above picture)
Highest Peak frequency (Hz)
% of contribution to the WideBand result

Marker: you can place a marker anywhere on the spectrum display with a
mouse click
Showed parameters:
Field strength at Marker frequency in the selected Unit (V/m in the above
picture)
Marker frequency (Hz)
% of contribution to the WideBand result

Delta: Difference in Field strength and frequency (Hz) between Highest

Peak and Marker

WideBand: integration over the displayed frequency band

It is the square sum of all contributions within the displayed spectrum.
Result of calculation is the field strength expressed in the selected unit
while “Bandwidth” is the difference between Stop and Start frequency.

Description 4-9
 Four additional frames, Acquisition, Marker, Save and Waterfall, are
included in the Data section:

Acquisition: spectrum is displayed in different acquisition modes.

Here is the choice between instantaneous reading and Root Mean Squared
over a certain period, which is set in the proper box. A Max Hold function is
also available. When the RMS is activated, a progressive bar appears
showing, step by step, how many seconds are already taken into account
for the calculation of the result.

Actual: instantaneous values are shown; the display is continuously

updated with new instantaneous readings.

RMS over: square average calculated over the specified time period (sec)
is shown. This is a moving average. Ones the first time period has been
completed, oldest data is discarded to be replaced by the newest one
showing thus the average value of the latest time period as specified.

Max Hold: the maximum field strength value of each frequency step is
retained and displayed since the Max Hold function has been activated.
Every spectral line is therefore updated only if the new value is grater than
the previously dislayed one showing thus the Maximum of each spectral
line since the Max hold function was activated.

Marker: in this area you can select on which trace to place the Marker:
specific axis (X,Y,Z) or Total result.
Three dedicated buttons, Highest Peak, Next Peak and Previous Peak,
allow Marker positioning over peaks shown by the graph.
If activated, Limit checkbox allows displaying the Limit value corresponding
to the Marker frequency.

Save: three buttons in this area to save spectrum as a picture file (.bmp),
as a text file (.txt) or to copy the spectrum picture to the Windows Clipboard.

Auto save text: it is a functionality provided to automatically save a text file

containing the measurements data and information.

4-10 Description
 It is also possible to insert a comment.

The user can select the path where the files will be stored.

The saved files will be structured as following:

Under the selected folder (EHP50-TS in the example) a folder will be

created and called like the current year (ex. 2014).
Inside this folder, another one will be created and called like the current
month (ex. 08, that is to say August).
Again inside a folder will be created for each day of saving (ex. 26).
The measurements will be in this last folder and their names will be in the
format hh_mm_ss_cc.TXT

Description 4-11
 Auto save text extract example

Round frequency: when this label is ticked, the frequency indication of the
Marker is corrected to the closest round value, thus avoiding approximation
errors.

Waterfall: press Start Waterfall to run the function, or Open Waterfall to

load previously saved measurements.

The Max Hold function is not available when the ICNIRP or IEEE limit
is selected.

4-12 Description
4.6.1 Waterfall In addition to the spectrum view, another representation has been
introduced in the software, commonly called Waterfall.
The advantage of this view is that the disturbances are shown in a
tridimensional plot. Two dimensions are, as usual, frequency and level, and
the third is the time.
In this way it is possibile to detect and track time-varying signals.
The ranges for Frequency and Level are the same as the Spectrum view.

When pressing the Start Waterfall button, a pop-up message can appear
warning the operator if a file with the same name as the one in use, already
exists.

Press Save As to mantain the original file, or Overwrite to cancel the old
measurement with the starting new one.

Fig.4-5 Waterfall - Graph 2D

In the Graph 2D, the horizontal axis represents Frequency, the vertical axis
is the Time and the colour is the Level.

The signal amplitude is represented in a scale of arbitrary colours, usually

the darker the lower and the brighter the higher, like in thermography.

The Color Scale referenced to levels and units, is indicated on the right
bottom of the screen.

The status-bar shows the number of tracks already acquired and the
maximum available.

On the right two sliders permit to set the preferred Reference Level and
Color Saturation (level dynamic range).

Press the Default button to reload standard settings.

Description 4-13
 When entering the Open Waterfall function a screen similar to the following
appears:

Fig.4-6 Waterfall Main Window

Like during the scan, on the left is the spectrogram of the measurements.
The column in the middle, called Events Horizon, reports the Marker with its
frequency and level and many parameters of the measurement setup and
of the probe used.

On the right, in addition to Ref. Level and Color Saturation, there are two
more sliders, useful to set the frequency resolution (Point of Track) and the
time interval (N° track).
It is also possible to Import or Export a full acquisition by pressing the
corresponding button in the Archive box. The name of the measurement
can be typed in the Name box and from the list it is possible to select an
already saved one.

In the Save box two or four buttons (depending on the marker activation)
can be pressed to save:
- a single trace (Levels vs Frequencies)
- a single Frequency (Levels vs Time)
- an image of the spectrogram
- the clipboard

4-14 Description
 Fig.4-7 Waterfall - Graph 3D

In the Graph 3D, one axis (blue) represents Frequency, another the Level
(green) and the third the Time (red). So the Frequency can be on the
horizontal axis, the Level on the vertical axis and the Time in depth.

For this mode, another box, called Movement, will appear.

Selecting the appropriate functions, you can move, rotate or zoom the view
to your liking, using the mouse.

Description 4-15
 Another option of the Graph 3D, the Time plot, is available when the
Marker is active.

Tick the Time label to enter this view.

A new window pops up and the plot represents the level at the marker
frequency versus time.

The horizontal axis of the grid is the time and the vertical axis is the field
level.

The Marker can be moved with the mouse to look for the desired
frequency.

In the 3D view also the dynamic can be selected between 120 and 140 dB,
to help for the best identification of disturbances.

4-16 Description
4.6.1.1 Data recording The subsequent spectra are automatically recorded and saved in a single
file *.WF5 localized in the folder Waterfall in the program root, inclusive of
all the analyzer settings.

The stored files can be recalled when in Data mode or at startup entering
the Open Waterfall window.

The filename is set by the operator prior to starting the test and it is
indicated at the upper right corner of the Waterfall window.

The maximum number of spectra that can be recorded is of 30.000 and it

is indicated, togheter with the current track number, in the status bar of the
Waterfall window.

Description 4-17
4.7 Style section This unit concerns the appearance of the program.

Buttons and labels styles can be selected from a Style list

Start and End Color buttons allow selection from a color palette

Sample Button and Sample Label show the appearance preview

Default button to set appearance to the default parameters

Trace to set trace colours by means of the colour palette

Tick the Disable colored bands box to avoid highlighting the bands for
which the software calculates the ICNIRP values.

Press Default Settings button to completely restore the initial aspect.

4-18 Description
4.8 ICNIRP The International Commission on Non-Ionizing Radiation Protection
establishes guidelines for limiting EMF exposure that could affect human
health.

Standard section allows the user to select standard ICNIRP limits, already
included by the software installation.

When the ICNIRP limit is selected, the software automatically calculates

the corresponding total integration of the measured signals, and compares
the result with the threshold set by the standard, considering whether it is or
is not exceeded.

The calculation of the ICNIRP value is performed if all three axes are
enabled

Description 4-19
 In the screenshot above it is depicted an example how the software shows
the calculation of the ICNIRP value for the Electric Field measurement.

In the screenshot above it is depicted an example how the software shows

the calculation of the ICNIRP value for the Magnetic Field measurement.

The limit cannot be activated when using Dual Mode.

4-20 Description
4.9 IEEE One of the purposes of the Institute of Electrical and Electronic
Engineers, Inc. ("IEEE") is to establish exposure standards.

Standard section allows the user to select standard IEEE limits, already
included by the software installation.

When the IEEE limit is selected, the software automatically calculates the
corresponding total integration of the measured signals, and compares the
result with the threshold set by the standard, considering whether it is or is
not exceeded.

With coherent signals the result can be overestimated

The calculation of the IEEE value is performed if all three axes are
enabled

Description 4-21
 In the screenshot above it is depicted an example how the software shows
the calculation of the IEEE value for the Electric Field measurement.

The limit cannot be activated when using Dual Mode.

4-22 Description
4.10 Weighted Peak The EHP-50F Weighted Peak (Time Domain) option performs test in the
Function range 1 Hz to 400 kHz to comply with the informative annex of the ICNIRP
(Time Domain) Guidelines 2010 (appendix “Determination of the weighted peak
exposure”) for coherent signal source.

The current legislation proposes limits for electromagnetic fields, the value
of which depends on the frequency.
When exposed to a sinusoidal field, it is relatively simple to relate the
measurement of the field to the reference limit, as the frequency is known
or easily measurable.
In case of multi-frequency fields, pulsed, non-sinusoidal waveforms, the
exposure assessment in relation to the limit becomes more complex.
In these cases, typical of industrial environments, it is not possible to relate
the amplitude of the field to the limit value at a specific frequency, as the
spectral content of the signal can be very complex (many frequencies are
present at the same time).
The ICNIRP guidelines propose a method for the evaluation of multi-
frequency fields, that consists of the sum of the field strength of the
individual spectral components related to the limit corresponding to the
frequency of each individual component. This method is appropriate in the
presence of incoherent components.

4.10.1 Weighted Peak The Weighted Peak function needs the following in the list order:
requirements
- In the Mode Section, select the Function “Weighted Peak (Time Domain)”
- In the Standard section set one of the available standards, such as, for
example, the ICNIRP 2010 limits for occupational or general public
exposure.
- In the Mode section select one of the ranges among the Electric 1 kV/m,
Electric 100 kV/m, Magnetic 100uT or Magnetic 10mT.
- In the Data section, enter the desired Hold Time.

Description 4-23
4.10.2 EHP50-TS Settings The Standard section allows the user to select one of the standard
ICNIRP or EU limits for occupational or general public exposure, already
included by the software installation.

In the Mode section you can select Electric 1 kV/m or Electric 100 kV/m
or Magnetic 100uT or Magnetic 10mT.

The Span section displays the frequency range, which is always full range
1 Hz to 400 kHz in Weighted Peak Mode.

The Data section allows the user to read the measurements for the highest
peak and Marker, to choose the axis and set the desired Hold Time.

4-24 Description
4.10.3 Weighted Peak Once the Weighted Peak has been enabled, the software shows the result
mode of the calculation and its graph over the time.

Result in percentage over the set hold time

The User can set the Hold Time (in milliseconds):

The Hold Time is the time resolution of the graph. During the Hold Time
the Weighted Peak results will be collected and the maximum value will be
shown in the graph.

Press the enter key to enter the Hold time value.

Description 4-25
 The minimum hold time is of 500 milliseconds.

The maximum is 10 minutes.

The time span of the graph is 200 times the hold time. The rolling
measurement memory deletes all values that date back longer than
the set time period.

The limit selected is shown in the higher right corner of the graph.

The full scale is automatically adapted to the field and the limit selected.

In the centre, above the grid of the graph, the time indication is the actual
time, the instant in which the measurement is made, at the end of the hold
time step.

4-26 Description
4.10.3.1 Noise indication The User should make use the following information to choose the proper
setting for the desired measurement.
For every situation, the best choice is to adopt the lower Full Scale
available (for example 100 µT) until the meter indicates an over-range
warning; when it happens, the User should switch the meter to the higher
Full Scale setting (as for the example above, 10 mT).

Electric Field (E)

Standard Range Noise indication
Low 2.5%
ICNIRP 1998 Gen.Pub.
High 10%
Low 1.5%
ICNIRP 1998 Occup.
High 5%
Low 2%
ICNIRP 2010 Gen.Pub.
High 10%
Low 1.5%
ICNIRP 2010 Occup.
High 10%
Low 1.5%
2013/35/EU Low
High 10%
Low 1%
2013/35/EU High
High 2.5%

The table above shows the noise for each standard and setting, for Electric
field measurements.

Magnetic field (H)

Standard Range Noise indication
Low 1.5%
ICNIRP 1998 Gen.Pub.
High 10%
Low 2.5%
ICNIRP 1998 Occup.
High 25%
Low 1%
ICNIRP 2010 Gen.Pub.
High 5%
Low 1.5%
ICNIRP 2010 Occup.
High 10%
Low 1.5%
2013/35/EU Low
High 10%
Low 1.5%
2013/35/EU High
High 10%
Low 1%
2013/35/EU Limbs
High 5%

The table above shows the noise for each standard and setting, for
magnetic field measurements.

Description 4-27
 For convenience, a noise threshold has been established, under
which the field indication becomes “LOW”, as in the example below.

4-28 Description
 5 - EHP-50F Stand alone mode
5.1 Stand alone mode EHP-50F has been designed to be used also in stand-alone mode. This
description mode is useful because no external devices is necessary to the analyzer
during measurements. Once the measurement parameters have been
programmed through a PC, the EHP-50F analyzer can start its acquisition
by storing the data over 24 hours in a stand-alone mode. It is necessary to
position it over the TR-02A tripod and to activate the start. After 24 hours it
will stop automatically and later it would be possible to download all the
data to the PC by using the provided EHP50-TS PC software. From PC it
is possible to select to measure the electric or magnetic field, to select the
range, the Highest or Wideband mode, the desired SPAN and the
sampling rate of one minute or 30 seconds.
Some typical applications are:
- Magnetic fields near high, medium and low voltage transformers
- Measurements in proximity of power line
- Safety measurement at worker’s site
- Measurements close to machines, air conditioning systems, home
appliances etc.
- Development of new products

To start the stand-alone acquisition it is necessary to follow this procedure:

- Turn OFF the EHP-50F.
- Remove the fiber optic connected to PC.
- Insert the small optical bridge connector into the fiber receptacle of
EHP-50F.
- Position it on TR-02A tripod or use the small tripod supplied with
EHP-50F (the provided 50cm extention rod must be used,
specially in case of Electric field measurement, to avoid any
Fig. 5-1 Shorting loop influence from the support plane).
- Turn on EHP-50F by pushing the Red POWER button for one
second (ORANGE LED for about 1 second is shown on button
press). After that, the led turns off for 2 seconds, lights orange for
about ½ second as an auto-check. Then you will see the led
flashing red and green for about one minute.
- Go away from the analyzer in order not to influence the
measurement.
- Wait 24 hours for the completion of the one-day measurement.
- The led of EHP-50F will flash every second to inform that it is ON
with GREEN light. After every minute (or 30 sec) the led will
become ORANGE for the time requested by the analyzer to
perform one measurement. The time that the led remain orange
will depend on the selected SPAN. Lower Spans require longer
measurement time.

The acquisition can be terminated earlier than 24 hours. Just turn off
the EHP-50F and run the application to download the data to the PC.

Document EHP50FEN-80106-1.69 - © NARDA 2018

EHP-50F Stand alone mode 5-1
5.2 EHP-50F Data Once the data has been collected by EHP-50F, you should connect it to
Logger the PC to download all measurement results.

5.2.1 Run Run “EHP-50F Stand Alone mode” application

EHP-50F-Stand
Alone mode
software

During the communication process for searching the analyzer EHP-50F,

the following messages will appear in sequence for a few seconds:

To define measurement parameters for a new stand alone acquisition you

may need to select:
- (Span) The Span
- (Fields) The electric or magnetic field with the proper range
- (Rate) The Storing Rate
- (Comment) To Insert the user’s comments

The Read Logger will not be available unless the communication between
the PC and the analyzer has been established. Click this button to read the
actual EHP-50F setup.

The Set Logger window will not be available unless you change some
parameters. The Set Logger will be active and available for the user to
transfer all measurement parameters (setup) to the EHP-50F internal
memory.

5-2 EHP-50F Stand alone mode

It is possible to set the date & clock inside the EHP-50F by transferring the
actual date & time of your PC. Pushing the button Set Date & Clock you
will get the following window:

Answering YES, the date & time of your PC will be transferred inside the
analyzer.

The measurement results can be shown in two modes:

Chronicle: the data are ordered by increasing time like in the following
example:

Median: the data are ordered from the lowest to the highest WIDE T value
like in the following example:

EHP-50F Stand alone mode 5-3

 If the checkbox Include Time is activated, the absolute time will be shown
togher with the collected data

If the checkbox Include Id is activated, a number representing the position

of the data inside the EHP-50F memory will be shown, like in the following
example.

Push the button Download to transfer all data from the analyzer to the PC

To save the data into your own PC directory, it is necessary to activate the
button Save.
Data will be saved in TXT format according to the following window:

5-4 EHP-50F Stand alone mode

5.2.2 Use EHP-50F When the communication between the PC and the analyzer has been
Logger established, push the button Download to transfer all data from the
analyzer to the PC.
To use such data you must save them into a file.

A typical display will be:

On the right side of the display, the software shows:

- Serial number of EHP-50F
- Firmware and FPGA release of EHP-50F
- The comment that you wrote inside the memory of EHP-50F typing
few words in the Comment window
- Number of samples stored
- RMS, Average, MAX and Median values in Highest and Wide
mode
- Span used during the acquisition
- Range
- Starting date and time
- All values collected

5.2.3 EHP-50F battery If the battery charger is plugged to the EHP-50F while the software is
charging running, the analyzer will be disconnected and the software will display:

and the led is flashing quickly.

During the charging process, always remove the bridge connector

from the EHP-50F

EHP-50F Stand alone mode 5-5

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5-6 EHP-50F Stand alone mode

 6 – Updating firmware
6.1 Update firmware The EHP-50F internal firmware can be updated easily by the user.

This section provides all the information required for firmware updating.

The Update Firmware Program is available after EHP50-TS package

installation.

6.2 To run the Turn off the EHP-50F and connect it to a free USB or RS232 port of the
update software PC.
Run EHP50F Update Firmware to start the update program.

The User should check that the battery level is at least 3.9 V before
starting the upgrade.

6.3 To transfer data Main window displayed after the updating program EHP-50F Update
Firmware has been run:

Fig.6-1 EHP-50F Upgrading Utility Main Window

Select USB or RS232 communication port.

Before selecting RS232 port, choose the COM port used.

1

Document EHP50FEN-80106-1.69 - © NARDA 2018

Update Firmware 6-1
 In case the software doesn’t detect any EHP-50F in the USB port, the
following message will be displayed.

As soon as the connection is established, a message informs to turn the

EHP-50F OFF and turn it ON again; press OK to confirm.

Two firmware components can be updated by this application: Firmware,

which is the main analyzer internal program, and FPGA, to update
parameters of the analyzer Field Programmable Gate Array.
Both files, required for updating, are automatically stored within the EHP-TS
directory during EHP50-TS software installation. To start the process simply
select Update Firmware or Update FPGA button, and wait (few minutes)
until the automatic transfer is completed.

6-2 Update Firmware

At the end, a message informs if the update has been successfully
performed.

Turn the EHP-50F OFF (it could seem to be already OFF but it is not) and
turn it ON again.

The EHP-50F is now updated with the new version of the internal firmware
or FPGA.

It is now possible to disconnect the cable connected to the PC, with the
EHP-50F meter either switched on or off.

Subsequently, when the meter is switched on again, the new version will be
displayed in the NBM-550, EHP50-TS or EHP-50F Stand Alone Mode
application software.

To obtain firmware or FPGA or programs updates for EHP-50F, please

contact your NARDA distributor or download it directly from the
NARDA Web site: www.narda-sts.it

Update Firmware 6-3

 This page has been intentionally left blank

6-4 Update Firmware

 7 – Uninstalling Software
7.1 Uninstalling It is possible to remove the EHP50-TS software from the PC according to
EHP50-TS Software the following procedure:

Run the Uninstall EHP-50 utility.

Follow the uninstaller instructions.

Fig. 7-1 Uninstalling EHP50-TS

Before removing any shared system file, the uninstaller will ask for a
confirmation.
Answer “NO” in case you are not sure whether the showed system file is
required for other applications.

Document EHP50FEN-80106-1.69 - © NARDA 2018

Uninstalling Software 7-1
 EHP50-TS software is now removed from the system, click “Finish” to close
uninstaller utility

7-2 Uninstalling Software

 8 – Uninstalling USB-OC
8.1 Uninstalling driver for It is possible to remove the USB-OC driver from the PC according to the
USB-OC following procedure:

The following procedure shows how to remove the driver in Windows

XP environment. It may be different depending on the operating
system in use.

Open the Windows Control Panel.

Double click “Application Installation”.

Document EHP50FEN-80106-1.69 - © NARDA 2018

Uninstalling USB-OC 8-1
 From the application list select “FTDI FTD2XX USB Drivers” and click
“Change/Remove”.

Fig.8-1 Uninstalling USB-OC

Unplug the USB-OC converter, if connected, and click “Continue”.

Click “finish” to exit the uninstaller, USB driver is now removed from your
system.

8-2 Uninstalling USB-OC

 9 - Accessories
9.1 Introduction This section provides information required for installing and using
accessories for EHP-50F Analyzer.
Information is included regarding initial inspection, power requirements,
interconnections, work environment, assembly, cleaning, storage and
shipment.
The following general information is applicable to all accessories.

9.1.1 Preliminary Inspect the packaging for any damage.

inspection
If the packaging or anti-shock material have been damaged, check
that the contents are complete and that the product has not suffered
electric or mechanical damage.
Check that all the Accessories are there against the checklist found
with the apparatus.
Inform the carrier and NARDA of any damage that has occurred.

9.1.2 Work environment Unless otherwise specified, the work environment of the Accessories, must
come within the following conditions:

• Temperature From -10°C to +50° C (0°C to 40°C for Battery

• Humidity Charger)
< 90% relative

The Accessories must be stored in a clean and dry environment, free from
dust, acids and humidity.
The storage environment must come within the range of the following
conditions:

• Temperature From -30°C to + 70°C (-20°C to 60°C for Battery Charger)

• Humidity < 95% relative

9.1.3 Return for repair When the Accessories need to be returned to NARDA for repair, please
complete the questionnaire appended to this User’s Manual, filling in all the
data that will be useful for the service you have requested.

For reducing the period of time required for the repairs, it is necessary to
be as specific as possible in describing the problem. If the problem only
occurs in certain circumstances, please describe in detail how it happens.
If possible it is better to reuse the original packaging; making sure that the
apparatus is wrapped in thick paper or plastic.
Otherwise, use strong packaging by using a sufficient quantity of shock
absorbent material around all sides of the product to ensure that it is
compact and does not move around inside the package.
In particular, take every precaution to protect the front panels.
Finish the package by sealing it up tightly.
Apply a FRAGILE label to the package to encourage greater care in its
handling.

9.1.4 Cleaning Use a dry, clean and non-abrasive cloth for cleaning the instruments.

Do not use solvents, acids, turpentine, acetone or other similar

products for cleaning the devices in order to avoid damaging them.

Document EHP50FEN-80106-1.69 - © NARDA 2018

Accessories 9-1
9.1.5 Power supply and EHP-50F accessories are powered by either internal rechargeable
battery chargers batteries or directly from other devices to which they are connected.
The AC/DC battery charger can be used with a power frequency at either
50 Hz or 60 Hz with a supply voltage between 100 and 240 AC Volt.
International AC plug adapters are provided according to the various
national standards.
AC plug adapter can be easily removed from the battery charger to be
replaced by a different one.

To have the greatest autonomy, a full recharging cycle should be carried

out before using the Accessories.

ALWAYS connect the battery charger to the mains BEFORE

connecting to the charge input of the accessories.
The battery charger has an internal protective circuit that will break
the output if any load is detected while connecting to the mains.

Battery charger:
output: DC, 10 - 15 V, ~ 500 mA
- +
Connector:

In order to preserve battery efficiency a complete recharge cycle is

required before storing them for periods longer than 4 months.
Therefore, it is warmly suggested recharging the batteries at least
every 4 months even though the device has not been used.

Software and Firmware updates for Accessories can be downloaded

from the Web site http://narda-sts.it, http://narda-sts.de, or requested
directly from NARDA Sales Centres.

9-2 Accessories
9.2 NBM-550 Controller and Display Unit for EHP-50F
EHP-50F can be easily operated using the Broadband Field Meter NBM-
550 as a controller and display unit. In order not to influence the field to be
measured, communication between the EHP-50F Analyzer and the NBM
Unit is through a rugged optical fiber cable. The NBM-550 supports the
following settings and measurement modes:
• Electric or magnetic field selection (1 kV/m; 100 kV/m; 100 µT; 10 mT)
• Span selection (100 Hz 400 kHz)
• Wideband or highest peak modes
• Spectrum Mode
• Monitor Mode (Actual; Max; Avg; Min)
• XYZ Mode (wideband or highest peak)
• Weighted Peak (WPM) ranging from 1 Hz to 400 kHz

Additional features include:

• Measurement setups
• Normalized spectrum in % related to a standard (e.g. ICNIRP)
• Alarm with adjustable thresholds for electric and magnetic field
• Averaging (4-32 samples) and Maximum Hold
• Unit selector for Tesla/Gauss
• Full resolution spectrum marker
• Data storage on NBM-550 including spectrum data
• Timer Logging
• Post-averaging for logged data on PC (RMS, Mean, Median)
• Powerful PC software NBM-TS for evaluation and documentation
• GPS receiver (optional)
• Operating languages:
Chinese, English, French, German, Italian, Russian, Spanish, Turkish

For more information, please refer to the NBM-550 product information on

Fig. 9-1 NBM-550 the Narda website.

Fig. 9-2 NBM-TS software supports evaluation and documentation of

results that have been saved on NBM-550

Accessories 9-3
 NBM-550 screenshots of EHP-50F results:

Fig. 9-3 Monitor Mode Fig. 9-4 XYZ Mode

Fig. 9-5 Spectrum Mode Fig. 9-6 Standard Mode (ICNIRP)

Fig. 9-7 Weighted Peak Mode Fig. 9-8 Weighted Peak Marker

9-4 Accessories
9.3 USB-OC Optical USB Converter
9.3.1 Introduction USB-OC is standard accessory of the EHP-50F Analyzer.
It converts the signals of some of the system’s accessories, which are only
connected via fiber optic, into USB-compatible signals. It, therefore, makes
it possible to link the following items up to the USB port of any Personal
Computer to operate them in conjunction with specific application software
and for firmware updating:
• EHP-50F Electric and Magnetic Field Analyzers, 1 Hz – 400 kHz
• EHP-200A Electric and Magnetic Field Analyzers, 9 kHz – 30 MHz
• NBM-550 Broadband meter

Either USB-OC or 8053-OC is indispensable for updating the internal

firmware of the above-mentioned items via a Personal Computer and the
relative update software is available free-of-charge on NARDA’s Web site
at: http://narda-sts.it

9.3.2 Installation Insert USB-OC in the connector of a free USB port of the PC, connect the
fiber optic coming from the probe or other Accessories treating the locating
key with care.
Considering the very low consumption of the device, the power required by
USB-OC is taken directly from the USB port of the PC. This means no
maintenance is needed.

Table 9-1 Technical specifications of the USB-OC Optical USB Converter

Max. length of the fiber optic 40 m

USB Connector Type A Male

The link between USB-OC and a HUB USB device or USB cable
extension could not work properly. Connect the USB-OC to the PC
directly.
Front view

Key:

Fiber optic connector

Rear view

Key:

USB Type A Male

Fig. 9-9 USB-OC adapters

Power supply USB-OC is powered directly from the USB port of the PC.

Accessories 9-5
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9-6 Accessories
 NARDA
Sales & Support: Manufacturing Plant:
Safety Via Leonardo da Vinci, 21/23 Via Benessea, 29/B
Test 20090 Segrate (MI) - ITALY 17035 Cisano sul Neva (SV)
Solutions Tel.: +39 02 2699871 Tel.: +39 0182 58641
S.r.l. Socio Unico Fax: +39 02 26998700 Fax: +39 0182 586400
http://www.narda-sts.it
Mod. 18-1
Caro cliente
grazie per aver acquistato un prodotto NARDA! Sei in possesso di uno strumento che per molti anni ti garantirà un’alta qualità di servizio. NARDA riconosce
l'importanza del Cliente come ragione di esistenza; ciascun commento e suggerimento, sottoposto all'attenzione della nostra organizzazione, è tenuto in grande
considerazione. La nostra qualità è alla ricerca del miglioramento continuo. Se uno dei Suoi strumenti NARDA necessita di riparazione o calibrazione, può aiutarci
a servirla più efficacemente compilando questa scheda e accludendola all’apparecchio.
Tuttavia, anche questo prodotto diventerà obsoleto. In questo caso, ti ricordiamo che lo smaltimento dell'apparecchiatura deve essere fatto in conformità con i
regolamenti locali. Questo prodotto è conforme alle direttive WEEE dell’Unione Europea (2002/96/EC) ed appartiene alla categoria 9 (strumenti di controllo). Lo
smaltimento, in un ambiente adeguato, può avvenire anche attraverso la restituzione del prodotto alla NARDA senza sostenere alcuna spesa. Può ottenere ulteriori
informazioni contattando i venditori NARDA o visitando il nostro sito Web www.narda-sts.it.

Dear Customer
thank you for purchasing a NARDA product! You now own a high-quality instrument that will give you many years of reliable service. NARDA recognizes the
importance of the Customer as reason of existence; in this view, any comment and suggestion you would like to submit to the attention of our service organization
is kept in great consideration. Moreover, we are continuously improving our quality, but we know this is a never ending process. We would be glad if our present
efforts are pleasing you. Should one of your pieces of NARDA equipment need servicing you can help us serve you more effectively filling out this card and
enclosing it with the product.
Nevertheless, even this product will become obsolete. When that time comes, please remember that electronic equipment must be disposed of in accordance with
local regulations. This product conforms to the WEEE Directive of the European Union
(2002/96/EC) and belongs to Category 9 (Monitoring and Control Instruments). You can return the instrument to us free of charge for proper environment friendly
disposal. You can obtain further information from your local NARDA Sales Partner or by visiting our website at www.narda-sts.it.
 Servizio richiesto:  Service needed:
 Solo taratura  Riparazione  Riparazione & Taratura  Taratura SIT  Altro:
 Calibration only  Repair  Repair & Calibration  Certified Calibration  Other:
Ditta:
Company:
Indirizzo:
Address:
Persona da contattare: Telefono:
Technical contact person: Phone n.
Modello: Numero di serie:
Equipment model: Serial n.

 Accessori ritornati con l’apparecchiatura:  Nessuno  Cavo(i)  Cavo di alimentazione Altro:

 Accessories returned with unit:  None  Cable(s)  Power cable Other:

 Sintomi o problemi osservati:  Observed symptoms / problems:

 Guasto:  Fisso  Intermittente Sensibile a :  Freddo  Caldo  Vibrazioni  Altro
 Failure:  Continuous  Intermittent Sensitive to:  Cold  Heat  Vibration  Other
Descrizione del guasto/condizioni di funzionamento:
Failure symptoms/special control settings description:

Se l’unità è parte di un sistema descriverne la configurazione:

If unit is part of system please list other interconnected equipment and system set up:
Suggerimenti / Commenti / Note:
Suggestions / Comments / Note: