SRM-3000
Advanced Test Equipment Rentals
www.atecorp.com 800-404-ATEC (2832)
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Selective Radiation Meter
Operating Manual
3001/98.21
SRM-3000
Selective Radiation Meter
300X/XX, Series C ...
Operating Manual
Please direct all enquiries to your local
sales company.
Narda Safety Test Solutions GmbH
Sandwiesenstr. 7
72793 Pfullingen, Germany
© 2007
Order no.: 3001/98.21
Edition : 11/07.06, C ...
Previous edition: 10/06.11, C ...
Subject to change without notice.
Our normal guarantee and delivery
terms apply
Printed in Germany
Contents
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
2 Safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
3 Preparation for use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
1.1 Application. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.2 About this instrument. . . . . . . . . . . . . . . . . . . . . . 1-3
1.3 About this Manual . . . . . . . . . . . . . . . . . . . . . . . . 1-4
2.1 Before connecting up . . . . . . . . . . . . . . . . . . . . . 2-1
2.2 Correct use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.3 AC Adapter / Charger . . . . . . . . . . . . . . . . . . . . . 2-3
2.4 Faults and excessive stresses . . . . . . . . . . . . . . 2-4
2.5 Disposal in accordance with local regulations. . . 2-4
3.1 Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.1.1 Packaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.1.2 Checking the instrument for transport damage . . 3-1
3.1.3 Recovery after transport and storage . . . . . . . . . 3-1
3.2 Power supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3.2.1 Battery pack operation . . . . . . . . . . . . . . . . . . . . 3-2
3.2.2 Handling the battery pack . . . . . . . . . . . . . . . . . . 3-3
3.2.3 Operation from AC Adapter / Charger. . . . . . . . . 3-3
3.3 Switching the instrument on and off . . . . . . . . . . 3-4
3.3.1 Switching on . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
3.3.2 Switching off . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
4 Instrument concept . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.1 SRM as a field strength meter. . . . . . . . . . . . . . . 4-1
4.1.1 Overall concept . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4.1.2 Basic instrument . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4.1.3 Antennas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
4.1.4 Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
4.2 SRM as a spectrum analyzer . . . . . . . . . . . . . . . . 4-4
5 Measurement setup variants . . . . . . . . . . . . . . . . . . . . . . 5-1
5.1 Variant overview . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
5.1.1 Measurement setup with a three axis antenna. . . 5-2
5.1.2 Measurement setup with a single axis antenna . . 5-3
5.2 Assembling the measurement setup . . . . . . . . . .5-5
5.3 Fitting the antenna directly
on the basic instrument . . . . . . . . . . . . . . . . . . . . 5-6
5.4 Using a cable to connect the antenna
to the basic instrument . . . . . . . . . . . . . . . . . . . . . 5-8
5.5 Fitting the Narda antenna to a tripod . . . . . . . . . 5-11
5.5.1 Antenna holder for three axis antennas . . . . . . . 5-11
5.5.2 Antenna holder for single axis and
three axis antennas . . . . . . . . . . . . . . . . . . . . . . 5-12
5.6 Registering a non-Narda antenna . . . . . . . . . . .5-14
5.7 Registering a non-Narda cable. . . . . . . . . . . . . . 5-15
6 User interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
6.1 Control elements . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
6.1.1 On / Off switch . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
6.1.2 Menu selection keys. . . . . . . . . . . . . . . . . . . . . . . 6-2
6.1.3 Softkeys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
6.1.4 Function keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
6.1.5 Rotary control . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
6.1.6 Keys for optimizing the display . . . . . . . . . . . . . . . 6-8
6.2 Operating status display. . . . . . . . . . . . . . . . . . . . 6-9
6.3 LCD panel elements. . . . . . . . . . . . . . . . . . . . . . 6-10
6.4 External connectors . . . . . . . . . . . . . . . . . . . . . . 6-12
7 “Safety Evaluation” mode . . . . . . . . . . . . . . . . . . . . . . . . 7-1
7.1 “Safety Evaluation” mode functions. . . . . . . . . . . 7-1
7.2 Selecting the operating mode . . . . . . . . . . . . . . . 7-1
7.3 Selecting the service to be measured . . . . . . . . . 7-4
7.3.1 Restricting the list of services to be measured
using the first service. . . . . . . . . . . . . . . . . . . . . . 7-4
7.3.2 Restricting the list of services to be measured
using the last service. . . . . . . . . . . . . . . . . . . . . . 7-5
7.3.3 Restoring the original list of services
to be measured . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5
7.4 Setting the measurement range . . . . . . . . . . . . . 7-6
7.4.1 Setting the measurement range manually. . . . . . 7-6
7.4.2 Search for the best measurement range. . . . . . . 7-7
7.4.3 Using noise suppression (Noise Threshold) . . . . 7-8
7.5 Selecting the result type . . . . . . . . . . . . . . . . . . 7-10
7.6 Selecting the averaging parameters . . . . . . . . . 7-11
7.7 Selecting the resolution bandwidth (RBW) . . . . 7-13
7.8 Selecting display options. . . . . . . . . . . . . . . . . . 7-15
7.8.1 Selecting the units for the results . . . . . . . . . . . 7-15
7.8.2 Selecting display options. . . . . . . . . . . . . . . . . . 7-16
8 “Spectrum Analysis” mode . . . . . . . . . . . . . . . . . . . . . . . 8-1
8.1 Operating mode functions . . . . . . . . . . . . . . . . . . 8-1
8.2 Selecting the operating mode . . . . . . . . . . . . . . . 8-1
8.3 Selecting the frequency range. . . . . . . . . . . . . . . 8-4
8.3.1 Selecting the frequency range entry method. . . . 8-4
8.3.2 Defining the frequency range
by upper and lower frequencies . . . . . . . . . . . . . 8-4
8.3.3 Defining the frequency range
by center frequency and frequency span . . . . . . 8-6
8.4 Setting the resolution bandwidth (RBW) . . . . . . . 8-7
8.5 Setting the measurement range . . . . . . . . . . . . . . 8-9
8.5.1 Setting the measurement range manually . . . . . . 8-9
8.5.2 Search for the best measurement range . . . . . . 8-10
8.6 Selecting the result type . . . . . . . . . . . . . . . . . . . 8-11
8.7 Selecting the averaging parameters. . . . . . . . . . 8-12
8.8 Selecting the display . . . . . . . . . . . . . . . . . . . . . 8-14
8.8.1 Selecting the units . . . . . . . . . . . . . . . . . . . . . . . 8-14
8.8.2 Selecting the display mode and scaling . . . . . . . 8-16
8.8.3 Rapidly changing the frequency span
(Zoom function) . . . . . . . . . . . . . . . . . . . . . . . . . 8-20
8.9 Evaluating results . . . . . . . . . . . . . . . . . . . . . . . . 8-28
8.9.1 Marker functions. . . . . . . . . . . . . . . . . . . . . . . . . 8-28
8.9.2 Peak table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-32
8.9.3 Integration over a defined frequency band. . . . . 8-37
9 “UMTS P-CPICH Demodulation” mode (option) . . . . . . 9-1
9.1 Operating mode functions . . . . . . . . . . . . . . . . . . 9-1
9.2 Selecting the operating mode. . . . . . . . . . . . . . . . 9-2
9.3 Selecting the display . . . . . . . . . . . . . . . . . . . . . . 9-5
9.3.1 Table Normal display mode . . . . . . . . . . . . . . . . . 9-6
9.3.2 Table Ratio display mode . . . . . . . . . . . . . . . . . . . 9-9
9.3.3 Bar Graph display mode. . . . . . . . . . . . . . . . . . . 9-10
9.3.4 Mixed display mode (numerical display
with graphical display versus time). . . . . . . . . . . 9-13
9.3.5 Value display mode (numerical) . . . . . . . . . . . . . 9-17
9.3.6 Graph (versus time) display mode . . . . . . . . . . . 9-18
9.4 Selecting an UMTS frequency or channel . . . . . 9-20
9.4.1 Selecting the center frequency . . . . . . . . . . . . . . 9-21
9.4.2 Selecting the channel number . . . . . . . . . . . . . . 9-22
9.5 Selecting the measurement range . . . . . . . . . . .9-23
9.5.1 Setting the measurement range manually . . . . . 9-23
9.5.2 Search for the best measurement range . . . . . . 9-24
9.5.3 Using noise suppression (Noise Threshold) . . . 9-25
9.6 Selecting the result type . . . . . . . . . . . . . . . . . . 9-27
9.7 Selecting the averaging parameters . . . . . . . . . 9-28
9.8 Selecting the UMTS demodulation algorithm
(FAST/SENSITIVE) . . . . . . . . . . . . . . . . . . . . . . 9-30
9.9 Setting the extrapolation factor (Extr. Fact.) . . . 9-31
9.10 Evaluating and interpreting
measurement results. . . . . . . . . . . . . . . . . . . . . 9-33
9.10.1 Individual results . . . . . . . . . . . . . . . . . . . . . . . . 9-33
9.10.2 Overall result (Total) . . . . . . . . . . . . . . . . . . . . . 9-34
9.10.3 Partial results for specific radio cells
(Scrambling Codes). . . . . . . . . . . . . . . . . . . . . . 9-34
9.10.4 Analog measurement result (Analog) . . . . . . . . 9-34
10 “Time Analysis” mode . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1
10.1 Operating mode function . . . . . . . . . . . . . . . . . . 10-1
10.2 Selecting the operating mode . . . . . . . . . . . . . . 10-1
10.3 Selecting display options. . . . . . . . . . . . . . . . . . 10-4
10.3.1 Value display . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-4
10.3.2 Graph display . . . . . . . . . . . . . . . . . . . . . . . . . . 10-6
10.3.3 Mixed display. . . . . . . . . . . . . . . . . . . . . . . . . . . 10-9
10.4 Selecting the Center Frequency (Fcent) . . . . . 10-10
10.5 Selecting the Detector Type
(RMS value, peak value) . . . . . . . . . . . . . . . . . 10-11
10.6 Selecting the Resolution Bandwidth (RBW) . . 10-12
10.7 Setting the measurement range . . . . . . . . . . . 10-13
10.7.1 Setting the measurement range manually. . . . 10-13
10.7.2 Search for the best measurement range. . . . . 10-14
10.7.3 Using noise suppression (Noise Threshold) . . 10-15
10.8 Selecting the Result Type . . . . . . . . . . . . . . . . 10-17
10.9 Selecting the Averaging Time . . . . . . . . . . . . . 10-18
10.10 Evaluating the results . . . . . . . . . . . . . . . . . . . 10-19
11 Isotropic measurements . . . . . . . . . . . . . . . . . . . . . . . . 11-1
11.1 Measurements with a three axis antenna. . . . . . 11-2
11.1.1 Isotropic measurement
with a three axis antenna . . . . . . . . . . . . . . . . . . 11-2
11.1.2 Measuring a single axis
with a three axis antenna . . . . . . . . . . . . . . . . . . 11-4
11.2 Measurement using a single axis antenna. . . . . 11-5
11.2.1 Standard measurement
using a single axis antenna . . . . . . . . . . . . . . . . 11-5
11.2.2 Isotropic measurement
with a single axis antenna . . . . . . . . . . . . . . . . . 11-6
12 Spatial Averaging (option) . . . . . . . . . . . . . . . . . . . . . . . 12-1
12.1 Spatial Averaging in
“Safety Evaluation” mode . . . . . . . . . . . . . . . . . . 12-4
12.1.1 Continuous Averaging . . . . . . . . . . . . . . . . . . . . 12-5
12.1.2 Discrete Averaging . . . . . . . . . . . . . . . . . . . . . . . 12-8
12.1.2.1 Discrete Averaging with a three axis antenna . . 12-8
12.1.2.2 Discrete Averaging with a single axis antenna .12-10
12.2 Spatial Averaging in
“Spectrum Analysis” mode . . . . . . . . . . . . . . . . 12-14
12.3 Spatial Averaging in
“Time Analysis” mode. . . . . . . . . . . . . . . . . . . . 12-16
13 Result memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-1
13.1 Saving data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-1
13.1.1 Saving a single measurement . . . . . . . . . . . . . . 13-2
13.1.2 Automatic saving . . . . . . . . . . . . . . . . . . . . . . . . 13-4
13.1.3 Time Controlled Storing (option). . . . . . . . . . . . .13-9
13.2 Managing data sets . . . . . . . . . . . . . . . . . . . . . 13-13
13.3 Entering and editing comments . . . . . . . . . . . . 13-17
13.4 Reading out stored data sets . . . . . . . . . . . . . . 13-19
14 General settings (Configuration) . . . . . . . . . . . . . . . . . . 14-1
14.1 Configurations for “Safety Evaluation” mode. . . 14-3
14.2 Configurations for “Spectrum Analysis” mode . . 14-3
14.3 Configurations for
“UMTS P-CPICH Demodulation” mode. . . . . . . 14-4
14.4 Configurations for “Time Analysis” mode . . . . . 14-5
14.5 Selecting a safety standard. . . . . . . . . . . . . . . . 14-6
14.6 Selecting a service table . . . . . . . . . . . . . . . . . . 14-7
14.7 Selecting a cell name table . . . . . . . . . . . . . . . . 14-9
14.8 Displaying device information . . . . . . . . . . . . . 14-11
14.9 Setting the date and time . . . . . . . . . . . . . . . . 14-13
14.10 Setting the number format
(Configure General). . . . . . . . . . . . . . . . . . . . . 14-15
14.11 Selecting the remote control interface
(Configure General). . . . . . . . . . . . . . . . . . . . . 14-15
14.12 Selecting the parameters
for the measurement range search
(Configure General). . . . . . . . . . . . . . . . . . . . . 14-16
14.13 Selecting an antenna / sensor. . . . . . . . . . . . . 14-17
14.14 Selecting a cable . . . . . . . . . . . . . . . . . . . . . . . 14-18
14.15 Creating and managing setups . . . . . . . . . . . . 14-20
15 Maintenance and repairs. . . . . . . . . . . . . . . . . . . . . . . . . 15-1
15.1 Changing the battery pack . . . . . . . . . . . . . . . . 15-1
15.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15-2
15.3 AC Adapter / Charger . . . . . . . . . . . . . . . . . . . . 15-3
16 Adapting the instrument configuration using
“SRM-Tools” or “SRM-TS”16-1
16.1 Task of the “SRM-Tools” software . . . . . . . . . . . 16-1
16.2 Connecting a PC to the SRM-3000 . . . . . . . . . . 16-3
16.2.1 Serial interface connection . . . . . . . . . . . . . . . . 16-4
16.2.2 USB interface connection. . . . . . . . . . . . . . . . . . 16-4
16.3 SRM configuration . . . . . . . . . . . . . . . . . . . . . . 16-10
16.4 Reading out the stored results from a SRM . . .16-13
16.5 Updating the firmware of the SRM . . . . . . . . . .16-15
16.6 Activating options . . . . . . . . . . . . . . . . . . . . . . . 16-16
16.7 Installing and uninstalling “SRM-Tools”
or “SRM-TS” . . . . . . . . . . . . . . . . . . . . . . . . . . . 16-18
17 Remote control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17-1
17.1 Connecting to the PC . . . . . . . . . . . . . . . . . . . . . 17-1
17.2 Switching the SRM to
remote controlled operation . . . . . . . . . . . . . . . . 17-2
17.3 Fundamentals of remote control. . . . . . . . . . . . . 17-3
17.3.1 Remote control command syntax. . . . . . . . . . . . 17-3
17.3.2 Parameter syntax . . . . . . . . . . . . . . . . . . . . . . . . 17-4
17.3.3 Command line termination . . . . . . . . . . . . . . . . . 17-4
17.4 Separate document about remote control . . . . . 17-5
18 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-1
18.1 Frequency range and operating modes . . . . . . . 18-1
18.2 RF characteristics. . . . . . . . . . . . . . . . . . . . . . . . 18-1
18.2.1 Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-1
18.2.2 “Spectrum Analysis” mode . . . . . . . . . . . . . . . . .18-3
18.2.3 “Safety Evaluation” mode . . . . . . . . . . . . . . . . . . 18-4
18.2.4 “UMTS P-CPICH Demodulation” mode (Option) 18-5
18.2.5 “Time Analysis” mode. . . . . . . . . . . . . . . . . . . . . 18-7
18.2.6 Measurement functions . . . . . . . . . . . . . . . . . . . 18-8
18.2.7 General specifications . . . . . . . . . . . . . . . . . . . 18-11
18.3 Three axis E-field measurement antenna
specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 18-13
18.3.1 Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . 18-13
18.3.2 Measurement uncertainty . . . . . . . . . . . . . . . . . 18-14
18.3.3 General specifications . . . . . . . . . . . . . . . . . . . 18-14
18.4 Single axis E-field antenna specifications
(3531/01) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-16
18.4.1 Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . 18-16
18.4.2 Measurement uncertainty . . . . . . . . . . . . . . . . 18-17
18.4.3 General specifications . . . . . . . . . . . . . . . . . . . 18-17
18.5 Single axis E-field antenna specifications
(3531/02B). . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-19
18.5.1 Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . 18-19
18.5.2 Measurement uncertainty . . . . . . . . . . . . . . . . 18-20
18.5.3 General specifications . . . . . . . . . . . . . . . . . . . 18-20
18.6 Single axis H-field antenna specifications
(3551/01) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-22
18.6.1 Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . 18-22
18.6.2 Measurement uncertainty . . . . . . . . . . . . . . . . 18-22
18.6.3 General specifications . . . . . . . . . . . . . . . . . . . 18-23
18.7 Conformity declaration . . . . . . . . . . . . . . . . . . 18-24
Appendix A:
Measurement methods using a single axis antenna . . A-1
Appendix B:
Technical descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
Appendix C:
Instrument graphics . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
1Introduction
1.1 Application
In today’s world, virtually everyone lives and works in an environment full of
technical equipment that generates electric and magnetic fields. As
research into the possible effects on humans has increased, so has
awareness of the problem and the depth of information within this area of
interest. Various authorities have long defined limit values to protect users
from excessive exposure to emissions.
The SRM-3000 provides practically everyone who is concerned with this
problem with a measuring instrument which, with the minimum of fuss, is
capable not only of showing whether limit values are being adhered to or
not, but also of allowing further analysis of the field components in relation
to the overall exposure.
The available operating modes cover the requirements of very different
users.
For example, a safety engineer concerned with the frequency spectrum of
telecommunications equipment can use the instrument to monitor
compliance with limit values at the workplace, and a planner can measure
the emissions present in public areas so that these can be taken into
account in future plans.
On the other hand, the SRM is also a high-quality evaluation tool for
qualified communications engineers who may be concerned with the
emission spectra present around telecommunications equipment.
The SRM takes care of all evaluations directly on site. Nevertheless, the
results can be transferred to a PC, so that measurement reports can be
produced, for example. The SRM can also be remote controlled from a PC.
1-1
1 Introduction SRM-3000
1-2
Fig. 1-1 The SRM-3000 in use
SRM-3000 1 Introduction
1.2 About this instrument
The SRM-3000 is an instrument for measuring high-frequency fields in the
range from 100 kHz to 3 GHz.
The instrument incorporates a very wide, versatile range of functions in an
extremely light weight, handy device. This means that it is also ideal for use
particularly under conditions that require high mobility and robustness.
The SRM-3000 is a complete measuring system. Along with the basic
instrument, the SRM, Narda Safety Test Solutions GmbH also supplies
various antennas as solutions to different applications and frequency
ranges. These antennas have either three axes or a single axis. All Narda
antennas can be mounted directly on the basic instrument or connected to
it using a special RF cable.
Antennas with three axes (three axis antennas) make it possible to
automatically detect the three spatial components of the field to be
measured. Isotropic measurements are simpler and much faster than with
single axis antennas.
Other commonly available antennas can also be connected to the SRM
using the customary types of connecting cable.
1-3
1 Introduction SRM-3000
1.3 About this Manual
The following is a standard text which explains the typographic conventions
used in Narda documentation.
Typographic conventions
Some of the paragraphs in this Manual are marked with various symbols or
headings to make it easier to read and understand.
ª The bent arrow indicates a cross-reference to another chapter or
section or to another document.
Note: This heading indicates important additional information or notes
about special features or situations.
✓ The check mark before a paragraph indicates a requirement that must
be fulfilled before the next steps can be carried out.
⇒ An arrow before a paragraph indicates a single action or task that must
be performed.
1. A numbered list indicates a series of actions that must be performed
one after the other.
1-4
2 Safety instructions
2.1 Before connecting up
This instrument was shipped in perfect condition. To ensure that this
condition is maintained and that operation is safe, please follow the
instructions given below.
2.2 Correct use
The instrument must only be used for the purpose and under the conditions
for which it is designed.
No warning function
The instrument is designed for detection and rapid evaluation of
electromagnetic field emissions. It is not a warning instrument; i.e. it does
Danger
not actively warn you of the presence of dangerous fields by means of
visible or audible signals.
⇒ Always consider this instrument to be a measuring instrument, not a
warning device.
⇒ Always carefully observe the measured value display when approaching
unknown fields.
⇒ If you are in any doubt, use a warning device such as “RadMan” or
“Nardalert” from Narda Safety Test Solutions to give warning of
potentially hazardous field strengths.
Danger
Unsuitable frequency range
Dangerous fields can be overlooked if an unsuitable frequency range is
selected.
⇒ Select the largest available or the appropriate frequency range.
⇒ Always carefully observe the measured value display when approaching
unknown fields.
⇒ If you are in any doubt, use a broadband device such as “RadMan” or
“Nardalert” from Narda Safety Test Solutions to give warning of
potentially hazardous field strengths.
2-1
2 Safety instructions SRM-3000
Misinterpretation of results obtained with single axis antennas
Only the field components which are parallel to the antenna axis will be
detected by a single-axis antenna.
Danger
Even if the field is strong, there is a danger that only a weak field or no field
at all will be measured if the antenna is not correctly positioned in the field.
⇒ Make sure that the measurement setup is suitable when using a single-
axis antenna.
Strong fields
Very strong fields can occur in the vicinity of some radiation sources.
⇒ Take care to observe safety barriers and markings.
Danger
⇒ In particular, persons fitted with electronic implants (pacemakers) must
keep away from danger areas.
Electric shock
High voltages can occur inside the instrument.
⇒ Do not bring the instrument or the antenna into contact with parts
Danger
carrying live voltages.
⇒ Do not open the instrument.
⇒ Do not use or handle an instrument which is open or which has been
visibly damaged.
⇒ Only use the accessories supplied and intended for use with the
SRM-3000.
Caution
2-2
Malfunction
Incorrect use, damage and unauthorized repairs can adversely affect the
accuracy and function of the instrument.
⇒ Only use the instrument under the conditions and for the purpose for
which it is designed.
⇒ Check the instrument regularly for signs of damage.
⇒ Repairs must only be made by qualified service personnel.
SRM-3000 2 Safety instructions
Malfunction
Metallic stickers placed on the (yellow) sensor area of the antenna can lead
to measurement errors, particularly to an underestimation of the
Caution
electromagnetic field strength.
⇒ Stickers or labels of any type should only be affixed to the (black)
antenna shaft.
2.3 AC Adapter / Charger
Electric shock
Parts carrying live voltages may be exposed if the AC Adapter / Charger is
damaged. This could result in injury from electric shock.
Danger
Caution
⇒ Never use a damaged AC Adapter / Charger.
Destruction
The AC Adapter / Charger can be destroyed or damaged by an incorrect AC
line voltage, condensation, too high or too low temperatures, and insufficient
ventilation.
⇒ Before connecting up the AC Adapter / Charger check that the
operating voltage of the AC Adapter / Charger and the voltage of the
local AC supply are the same.
⇒ Do not use an AC Adapter / Charger on which condensation has formed.
If condensation is unavoidable, e.g. because the AC Adapter / Charger is
cold and it is brought into a warm room, make sure that it has dried out
before connecting it up.
⇒ Only use the AC Adapter / Charger indoors and at temperatures between
+5 °C and +45 °C.
2-3
2 Safety instructions SRM-3000
2.4 Faults and excessive stresses
Take the instrument out of service and secure it against unauthorized use if
safe operation is no longer possible. This is the case, for example, if:
• the instrument shows visible signs of damage,
• the instrument does not work,
• the instrument has been subjected to any kind of stress that exceeds the
permitted limits.
In such cases, contact the service center for your area.
2.5 Disposal in accordance with local regulations
The SRM-3000 is 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.
The SRM-3000 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 environmentfriendly disposal. You can obtain further information from your local Narda
Sales Partner or by visiting our website at www.narda-sts.com.
2-4
3 Preparation for use
3.1 Unpacking
3.1.1 Packaging
The packaging is designed to be reused as long as it has not been damaged
during previous use. Keep the original packaging and use it for all future
transport of the instrument.
3.1.2 Checking the instrument for transport damage
After unpacking, check the instrument and all accessories for any damage
that might have occurred during transport. This should be suspected if the
packaging itself has been clearly damaged. Do not attempt to use a
damaged instrument.
3.1.3 Recovery after transport and storage
Condensation can form on an instrument that has been stored or
transported at a low temperature when it is brought into a warmer
environment. To prevent any damage, wait until condensation is no longer
visible on the instrument surface. The instrument is not ready for use until it
has reached a temperature within the guaranteed operating range of
-10 °C to +50 °C.
3-1
3 Preparation for use SRM-3000
3.2 Power supply
The battery pack provided is usually used as the power supply. You can
also use the AC Adapter / Charger as an alternative power supply.
3.2.1 Battery pack operation
The SRM-3000 is operated from the battery pack supplied with the
instrument.
A fully charged battery pack is sufficient for about 4 hours operation. As
supplied, the battery pack is only pre-charged and needs to be fully charged
before it is used for the first time.
Note: Only use original battery packs as supplied with the instrument. If the
capacity of the battery pack supplied is insufficient for your test task
requirements, further battery packs can be obtained as accessories.
Charge indicator
The charge state of the battery pack is indicated by a battery symbol in the
“General information” section of the LCD panel.
ª Refer to sec. 6.3, page 6-10 for more details.
3-2
Discharge indication
If the battery voltage drops below a critical value, the battery symbol will be
replaced by the flashing message “Low Battery”. A warning message will
also be displayed at regular intervals in the center of the LCD panel. The
instrument will switch off automatically after about 10 minutes of further
operation. The instrument configuration is saved before switch off.
SRM-3000 3 Preparation for use
Charging the battery pack
A full charge cycle takes about 3.5 hours.
You must use the AC Adapter / Charger supplied with the instrument to
charge the battery pack.
Starting the charge cycle
✓ The local AC line voltage and the operating voltage of the AC Adapter /
Charger must be the same.
1. Connect the AC Adapter / Charger to the charging socket of the
SRM-3000.
2. Connect the AC Adapter / Charger to the AC power supply.
Charging starts.
A red LED next to the “Charge” label is on during the entire charge cycle.
When the battery pack is fully charged, the AC Adapter / Charger
automatically switches to trickle charging.
At this stage, a green LED next to the “Charge” label switches on.
3.2.2 Handling the battery pack
• Do not drop, damage or dismantle the battery pack.
• Only recharge the battery pack as described in this Operating Manual.
• Do not expose the battery pack to very high temperatures for a long time
either inside or outside the instrument.
• Do not leave a discharged battery pack in the instrument for a long time.
• Do not store battery packs for more than six months without recharging
them occasionally.
3.2.3 Operation from AC Adapter / Charger
The SRM-3000 can always be powered and operated from an AC Adapter /
Charger connected to it.
This is not recommended in practice, however, because the measurement
characteristics can be affected considerably by the presence of the power
supply cable in the field when the SRM-3000 is operated with the AC
Adapter / Charger connected to it.
3-3
3 Preparation for use SRM-3000
3.3 Switching the instrument on and off
3.3.1 Switching on
✓ You have made sure that the battery pack is sufficiently charged for the
planned measurement task.
⇒ Press the ON/OFF button for about 1 second.
The SRM-3000 switches on.
A green LED next to the “Status” label switches on.
The function test runs.
Function test
The function test checks the functions of various components and checks
internal processes. It takes about 5 seconds.
A test screen is displayed during the function test. This shows the
instrument name and serial number along with a list of the elements that are
to be tested.
3-4
Fig. 3-1 Display during function test
When the function test has been completed successfully, the instrument
reverts to the settings used for the last measurement and the measurement
screen is displayed.
Measurements can now be started.
SRM-3000 3 Preparation for use
Fig. 3-2 Display after completion of function test (example)
Note: The instrument reverts automatically to the default setting if you
change the antenna:
– Maximum input attenuation, i.e. least sensitive measurement
range
– Maximum frequency range
Possible faults
If a fault occurs during the function test, the message “Error detected during
initialization” will be displayed and the start-up process will be interrupted
automatically. The error code for the fault that was detected will be shown
on the display.
⇒ Contact the Service Center.
3.3.2 Switching off
⇒ Press the ON/OFF button for at least 1 second.
The LCD panel clears. The instrument is switched off.
3-5
3 Preparation for use SRM-3000
Notes:
3-6
4 Instrument concept
4.1 SRM as a field strength meter
The SRM is an instrument designed to measure electromagnetic fields in
the frequency range from 100 kHz to 3 GHz. The main measurement task is
the determination of field strength.
Users can select from several operating modes, all of which are designed to
give immediate, informative on-site results that require no further
processing or evaluation.
In “Safety Evaluation” mode, users can put together a list of frequency
ranges within which the field strength is to be measured. The results in each
frequency range of the so-called Service Table defined in this way are
displayed in units of field strength or as a percentage of a selected safety
standard. The displayed value 100% indicates that the limit value defined in
the standard has been reached. This makes direct, on-site determination of
compliance with defined limit values possible.
In “Spectrum Analysis” mode, all the field components in the selected
environment can be detected to give an overview of the spectrum or for
determining maximum values. Here too, the extended functions of the
instrument allow evaluation of the measured values directly on site.
In “UMTS P-CPICH Demodulation” mode (option) the SRM decodes the
Primary Common Pilot Channel of UMTS cells. As in “Safety Evaluation”
mode, the field strengths due to individual pilot channels can be determined
in units of field strength or as percentages of a selected human safety
standard level. The field strength exposure that the cell would cause when
fully loaded can be extrapolated from these values.
In “Time Analysis” mode, the SRM makes selective, continuous
measurements at a fixed, user-defined frequency. This allows detection of
even short duration spikes, e.g. from pulsed radar equipment. The
operating mode is ideal for timer-controlled measurements.
4-1
4 Instrument concept SRM-3000
4.1.1 Overall concept
In the simplest case, the complete test setup for measuring field strength
consists of the basic instrument plus an antenna which plugs into the basic
instrument.
Depending on the measurement method selected, it may be advisable or
necessary to place the antenna some distance from the basic instrument
rather than directly on it. Cables can be used to connect the antenna to the
basic instrument. The field strength measuring systems supplied by Narda
Safety Test Solutions include a 1.5 m long cable. A 5 m long cable is
available for special applications.
The antenna must be placed where it will not be disturbed and positioned
exactly for precision measurements. A tripod which is also provided with a
suitable positioning device can be added to the test setup for this purpose.
Regardless of the items supplied as described, you can also connect
customary antennas and cables to the basic instrument and make
measurements as required.
4.1.2 Basic instrument
The SRM is a field strength meter which can be used for outdoor
measurements, especially in locations where access is difficult or awkward.
The functions of the instrument have therefore been tailored to provide easy
handling under practical conditions of use.
Despite its wide range of functions, the SRM is very handy and light. There
are two ergonomically formed grips located to the left and right of the
casing, which allow secure handling during measurements and trouble-free
access to all controls at the same time.
The main menus are accessed by three menu selection buttons.
Sub-menus, functions and entry boxes within these menus is by means of
softkeys. Function keys allow direct entry of parameters and access to the
evaluation and memory functions.
The large easy-to-read LCD panel is backlit to allow operation even in
poorly-lit areas.
The foil keypad makes operation even under bad conditions safe and sure.
ª All the display and control elements of the basic instrument are
described in sec. 6, page 6-1.
4-2
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