NARDA EHP-50F User manual

NARDA
Safety
Test
Solutions
S.r.l. Socio Unico
Sales & Support:
Via Leonardo da Vinci, 21/23
20090 Segrate (MI) - ITALY
Tel.: [phone]
Fax: [phone]
Manufacturing Plant:
Via Benessea, 29/B
17035 Cisano sul Neva (SV)
Tel.: [phone]
Fax: [phone]
http://www.narda-sts.it
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-50501-1.63 – Copyright © NARDA 2015
User’s Manual
EHP-50F
ELECTRIC AND MAGNETIC
FIELD PROBE - ANALYZER
From 1 Hz up to 400 kHz

II Note and symbols
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 Users 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 eventually 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
instructions, pay attention to the safety symbols. Unit Earth Connection
Earth Protection Equipotential
KEY TO THE SYMBOLS USED IN THIS DOCUMENT:
DANGER
The DANGER sign draws attention to a potential risk to a person’s
safety. All the precautions must be fully understood and applied before
proceeding.
WARNING
The WARNING sign draws attention to a potential risk of damage to the
apparatus or loss of data. All the precautions must be fully understood
and applied before proceeding.
CAUTION The CAUTION sign draws attention against unsafe practices for the
apparatus functionality.
NOTE: The NOTE draw attention to important information.

Contents III
Contents
Page
Safety requirements and instructions…..........…….....………
EC Conformity Certificate…............................………………...
VI
VII
1 General information Page
1.1 Documentation......................................................….……….
1.2 Introduction ……………….....................………………………
1.3 Configuration and Standard accessories...............................
1.4 Optional accessories ..............................................…………
1.5 EHP-50F Main specifications..................................………….
1.6 Isotropic E&H field analyzer EHP-50F typical uncertainty
and Anisotropy…………………………………………………..
1.6.1 Typical uncertainty of EHP-50F……………………………..
1.6.2 Explication Notes……………………………………………...
1.7 Anisotropy………………………………………………………..
1.8 EHP-50F panel...................................………..………………
1-1
1-1
1-3
1-3
1-4
1-5
1-5
1-6
1-7
1-8
2 Installation and use Page
2.1 Introduction…………….........................................…...……..
2.2 Preliminary inspection…….............................……...………
2.3 Work Environment………..........................…………..………
2.4 To return for repair…..…..................................……...………
2.5 Equipment cleaning………..…….….................……...………
2.6 Power supply and battery recharging………………………...
2.7 EHP-50F connected to a PC………………………………….
2.8 EHP-50F stand-alone mode….….…………………….………
2.9 EHP-50F with NBM-550…….…………………………………
2.10 Battery management…………….……………………………
2.11 Avoiding measurement errors………………………………..
2-1
2-1
2-1
2-1
2-1
2-2
2-3
2-3
2-3
2-3
2-4
3 EHP-TS installation Page
3.1 Introduction…………………………………………………..….
3.2 Hardware requirements…………………………...………..….
3.3 Installing EHP-TS Software………….………………..……….
3-1
3-1
3-2
4 EHP-TS software Page
4.1 EHP-TS Applications……………………………………………
4.2 EHP-50F Applications.……….....…………………………..….
4.2.1 Main menu………………….………………………………….
4.3 Mode section.……………………………………………………
4.4 Span section……………...………………………………………
4.5 Standard…………………………………………………………..
4.6 Data section………………………………………………………
4.6.1 Waterfall………………………………………………………..
4.6.1.1 Data recording……………………………………………….
4.7 Style section.……………………………………………………..
4.8 ICNIRP…………………………………………….………………
4.9 IEEE………..……………………………………………………...
4.10 Weighted Peal Function (Time Domain)…….……………….
4.10.1 Weighted Peak requirements……………………………….
4.10.2 EHP-TS Settings..…………………………………………...
4.10.3 Weighted Peak Mode………………………………………..
4.10.3.1 Dynamic ranges……………………………………………
4-1
4-2
4-2
4-4
4-5
4-7
4-9
4-13
4-17
4-18
4-19
4-21
4-23
4-23
4-24
4-25
4-27

IV Contents
5 EHP-50F Stand alone mode Page
5.1 Stand alone mode description………….………………….….
5.2 EHP-50F Data Logger………………………………………….
5.2.1 Run EHP-50F Stand-alone mode software………………..
5.2.2 Use EHP-50F Logger………………………………………..
5.2.3 EHP-50F battery charging…………………………………..
5-1
5-2
5-2
5-5
5-5
6 Update Firmware Page
6.1 Update firmware…………..…………………………………….
6.2 To run the update software..…………………………………..
6.3 To transfer data ………………………………………………..
6-1
6-1
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………………….………………………………....
9.1.1 Preliminary inspection……..…...…………………………..
9.1.2 Work environment….………………………………………...
9.1.3 Return for repair…………………………………………..…
9.1.4 Cleaning…………………………………………………..….
9.1.5 Power supply and battery chargers…………………….…
9.2 NBM-550 Controller and display Unit for EHP-50F……….
9.3 USB-OC Optical USB Converter…………………………....
9.3.1 Introduction…………………………………………………..
9.3.2 Installation…………………………………………………...
9-1
9-1
9-1
9-1
9-1
9-2
9-3
9-5
9-5
9-5

Contents V
Figures
Figure Page
1-1
1-2
1-3
3-1
4-1
4-2
4-3
4-4
4-5
4-6
4-7
5-1
6-1
7-1
8-1
9-1
9-2
9-3
9-4
9-5
9-6
9-7
9-8
9-9
Block Diagram of the EHP-50F ………………….
3D mesh measurements of magnetic probe…….
EHP-50F panel ........………...............…………..
EHP-TS Installation………………………………..
EHP50-TS Main Window…….……………………
Defining frequency band through the PC mouse
Zoom window……………………………………….
Data section…………………………………………
Waterfall - Graph 2D……………………………….
Waterfall Main Window…………………………….
Waterfall - Graph 3D……………………………….
Shorting loop………………………………………..
EHP-50F Upgrading Utility Main Window……....
Uninstalling EHP-TS……………………………….
Uninstalling USB-OC………………………………
NBM-550……………………………………………
NBM-TS software………………………………….
Monitor Mode……………………………………….
XYZ Mode…………………………………………..
Spectrum Mode…………………………………….
Standard Mode (ICNIRP) …………………………
Weighted Peak Mode………………………………
Weighted Peak Marker…………………………….
USB-OC Adapters…………………………………
1-2
1-7
1-8
3-2
4-2
4-5
4-6
4-9
4-13
4-14
4-15
5-1
6-1
7-1
8-2
9-3
9-3
9-4
9-4
9-4
9-4
9-4
9-4
9-5
Tables
Table Page
1-1
2-1
9-1
Technical Specifications of the EHP-50F….…....
Autonomy of the battery……………………………
Technical Specifications of the USB-OC………..
1-4
2-3
9-5

VI Safety Consideration
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.
xIn 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;
xDevices 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;
xAny 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;
xGround connections must not be interrupted;
xTo 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;
xTo maintain adequate protection from fire hazards, replace fuses only with others of the same type
and rating;
xFollow the safety regulations and any additional instructions in this manual to prevent accidents and
damages.

EC Conformity VII
EC Declaration of Conformity
In accordance with the Decision 768/2008/EC
Compliant to the Directives: EMC 2004/108/EC and Low Voltage 2006/95/EC
Also compliant to the ISO/IEC standard 17050-1 and 17050-2
The manufacturer,
NARDA Safety Test Solutions s.r.l. Socio Unico
via Benessea 29/B
17035 Cisano sul Neva (SV) – ITALY
based on the following harmonized European Standards, successfully applied:
Safety: EN 61010-1 (2011)
EMC: EN 61326-1 (2007)
declares, under its sole responsibility, that the product: EHP-50F E&H Field Analyzer
conforms with the essential requirements of the Low Voltage Directive 2006/95/EC
and of the EMC Directive 2004/108/EC.
Cisano, 02/04/2015 Egon Stocca, General Manager

VIII Safety Consideration
This page has been left blank intentionally

General Information 1-1
1 - General information
1.1 Documentation The following documents are included in this Manual:
xA questionnaire to be sent to NARDA together with the apparatus
should service be required.
xA 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 fibre.
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-50501-1.63 - © NARDA 2015

1-2 General Information
EHP-50F is housed in a small cubic housing. The bottom side panel
includes an optical fibre 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.

General Information 1-3
1.3 Configuration and
Standard Accessories
The EHP-50F, Set for Stand-alone and PC use (P/N 2404/104), is supplied
complete of the following items:
xEHP-50F Basic Unit
xAC/DC Battery Charger
xCable, FO Duplex, RP-02, 10m;
xO/E Converter USB, RP-02/USB
xOptical Bridge Connector RP-02;
xTripod Extension, 0.50m;
xMini Tripod, Benchtop
xEHP-TS software, CD-ROM including User’s Manual;
xSoftcase for EHP;
1.4 Optional Accessories The following accessories may be ordered as options:
xTR-02A wooden tripod 1-2m with soft carrying bag;
xTT-01 telescopic mast (120-420 cm) with carrying bag;
x8053-CC Rigid case;
x8053-CA Car Adapter.

1-4 General Information
1.5 EHP-50F Main
specifications
When not differently specified the following specifications are
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 1k
:
)
Frequency range 1 Hz ÷ 400 kHz
Measurement range (1) 5 mV/m ÷ 1 kV/m
500mV/m ÷ 100 kV/m
(146 dB)
0.3 nT ÷ 100 μT
30 nT ÷ 10 mT
(150 dB)
30 nV ÷ 10 mV
3 uV ÷ 1 V
(150 dB)
Overload 200 kV/m 20 mT 2V
Dynamic range 106 dB 110 dB 110 dB
Resolution (2) 0.1 mV/m
1 mV/m Stand alone
0.1 nT
1 nT Stand alone
0.1 nV
Displayed average noise level (3)
Isotropic result
Single axis
5 mV/m
3 mV/m
0.3 nT
0.2 nT 30 nV
Flatness (@ 100 V/m, 2 μT, 1mV)
(5 Hz ÷ 40 Hz)
(40 Hz ÷ 100 kHz)
(100 kHz ÷ 400 kHz)
0.35 dB
0.35 dB
0.35 dB
0.7 dB
0.35 dB
0.7 dB
0.35 dB
0.35 dB
0.35 dB
Anisotropicity (typ) 0.54 dB 0.12 dB ---
Linearity (referred to 100 V/m and 2 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 analysys
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
@ 55 Hz referred to 23°C
(@ 50% of relative humidity when applicable)
-4x10-3 dB/°C within -20 +55 °C -8x10-3 dB/°C within -20 +23 °C
+13x10-3 dB/°C within +23 +55 °C ---
Typical relative humidity deviation
@ 55 Hz referred to 50%
(@ 23 °C)
+11x10-3 dB/% within 10 50 %
+22x10-3 dB/% within 50 90 %
-7x10-3 dB/% within 10 50 %
+10x10-3 dB/% within 50 90 % ---
Dimensions 92 x 92 x 109 mm
Weight 550 g
Tripod support Threaded insert ¼”
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 t50 Hz and SPAN d1 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

General Information 1-5
1.6 Isotropic E&H field
analyzer EHP-50F
typical uncertainty
and anisotropy
1.6.1 Typical uncertainty
of EHP-50F
The uncertainties stated in this document have been determined according
to EA-4/2 [4].
They were estimated as expanded uncertainty obtained multiplying the
standard by the coverage factor k=2, corresponding to a confidence level of
about 95%.
The total uncertainty of the probe derived from typical contributions of
linearity, anisotropy, frequency response, temperature, relative humidity and
with/without contribution of uncertainty of calibration.
Magnetic probe (1) Magnetic flux
density
range
Total expanded uncertainty (k=2)
Without contribution of
uncertainty of
calibration UEHP50F (%)
With contribution of
uncertainty of
calibration UT(%)
Frequency at 50 Hz
50 nT to < 100 μT 2.3 3.0
(2)
100 μT to 3000 μT 2.6 3.8 (3)
Frequency from 5 to 40 Hz 50 nT to 10.0 μT 5.3 5.7 (2)
Frequency from 40 to 100 kHz 50 nT to 10.0 μT 4.9 5.3 (2)
(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 uncertainty of calibration used is 2,0%
(3) The uncertainty of calibration used is 2,8%
Electric probe (4) Electric field
range
Total expanded uncertainty (k=2)
Without contribution
of uncertainty of
calibration UEHP50F
(%)
With contribution of
uncertainty of
calibration UT(%)
Frequency at 50 Hz
1 V/m to 1000 V/m 7.1 7.4 (5)
1 V/m to < 100 kV/m 7.8 8.2 (6)
Frequency from 5 Hz to 100 kHz 1 V/m to < 1000 V/m 8.8 9.2 (6)
(4) This uncertainty budget is for an ambient temperature of (23 +/- 4) °C, and relative humidity of (50 +/- 5) %
(5) The uncertainty of calibration used is 2,0%
(6) The uncertainty of calibration used is 2,5%

1-6 General Information
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 UT, the
uncertainty of calibration has to be taken into account:

22
50 CalFEHPT UUU 
where FEHP
U50 is the standard uncertainty
( FEHP
U50 = U FEHP50 / 2 )
Cal
Uis the standard uncertainty
( Cal U= U Cal / 2 )
where U Cal is the expanded uncertainty reported on certificate
The quadratic sum is considered a precaution because the
uncertainty Cal
Uis 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 o
f
0.26 dB ( 0.013 dB / °C ) equivalent to 3,04% and therefore, assuming a
rectangular distribution of probability, the standard uncertainty is 1.75%
( = 0,03 / 3).
Assuming an expanded uncertainty UT=2.3%,

042.00175.0
2
029.0
22
2

¸
¹
·
¨
©
§
x
TOT
Uis obtained.
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%.

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.
¸
¸
¹
·
¨
¨
©
§


minmax
max
10
log20 SS
S
AdB equation (1)
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 4Ssteradians.
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,
T , M ).
The anisotropy is evaluated with 30 degrees steps for
T and M , 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
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
1.8 EHP-50F Panel
Key:
1. Led
2. Battery charger connector
3. ON/OFF button
4. Fiber optic connector
Fig. 1-3 Panel of EHP-50F
1
2
3
4

Installation and use 2-1
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
inspection
Inspect the packaging for any damage.
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:
xTemperature
xHumidity
From -20°C to +55°C
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:
xTemperature
xHumidity
From -30°C to + 75°C
< 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.
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-50501-1.63 - © NARDA 2015

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

Installation and use 2-3
2.7 EHP-50F connected
to a PC
Using the EHP-TS software spectrum analysis can be displayed on a PC
2.8 EHP-50F stand alone
Mode
The EHP-50F offers a Stand-alone mode of operation and thanks to its
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 EHP-TS PC software.
2.9 EHP-50F with
NBM-550
EHP-50F is linked to NBM-550 via the fiber optic link.
See NBM-550 Manual for further details
2.10 Battery
management
The Table summaries the battery autonomy of the Analyzer depending on
its mode of operation.
TABLE 2-1 Autonomy of the battery
STAND ALONE MODE
Span Normal functioning
Autonomy (hours)
30s Sample 60s Sample
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

2-4 Installation and use
2.11 Avoiding
measurement errors
To avoid disturbing the measurements in progress, the user or other
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:
dr
r
r
E
V³

2
1
21
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:
m
KV
m
V
E1
1,0
100
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.