NARDA SRM-3000 Operating Manual

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SRM-3000

Advanced Test Equipment Rentals

www.atecorp.com 800-404-ATEC (2832)

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.

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

SRM-3000 4 Instrument concept

4.1.3 Antennas

A three axis antenna is included as standard with your SRM-3000. This antenna covers the frequency range from 75 MHz to 3 GHz. It automatically determines the three spatial components of the field being measured, so isotropic measurements are quick and easy to perform. It is designed for outdoor use and for making measurements in places that are difficult to access.

Narda Safety Test Solutions also supplies other single axis and three axis antennas for electric and magnetic fields that are suitable for other applications and lower frequency ranges.

Every Narda antenna is equipped with a control cable as well as the RF connection. The control cable is connected to the basic instrument by a multi pin connector, and is used to transmit the antenna parameters (type, serial number, calibration date, list of antenna factors) so that these can be recognized by the SRM.

Customary types of antenna can also be connected to the basic instrument. The table below summarizes the types of antenna that are suitable for measuring field strength exposure:

Type Field type

Broadband dipole

Log- periodic antenna

Loop antenna Magnetic field Between 100 kHz and

Table 4-1 Antenna types

measured

Electric field Between 30 MHz and

Frequency range (typical values)

3 GHz

20 GHz

30 MHz

Notes

Directional characteristic. Not suitable for isotropic measurements.

4-3

4 Instrument concept SRM-3000

4.1.4 Cable

Narda Safety Test Solutions offers two cables that can be used for the connection between the antenna and the basic instrument, covering the frequency range between 100 kHz and 3 GHz. These cables are 1.5 m and 5 m long and contain ferrite to reduce the effects of the external field on the measurement results. The cables contain a control cable as well as the RF cable. This is connected to the basic instrument by a multi pin connector. This control cable transmits the cable parameters (type, serial number, calibration date, list of attenuation factors) so that these can be recognized by the SRM. When the three axis antenna is used, the SRM also uses this cable to control successive measurement of all three axes for an isotropic result (see sec. 11.1.1, page 11-2), or to select a single axis in order to obtain directional information (see sec. 11.1.2, page 11-4).

Customary types of cable can also be used for the connection between the antenna and the basic instrument. However, such cables do not provide the controller function for three axis antennas.

4.2 SRM as a spectrum analyzer

Although designed for field use, the basic instrument of the SRM can also be used as a spectrum analyzer under laboratory conditions, for example.

The serial or USB interface can be used to connect the instrument to a PC and provide access to the instrument functions.

4-4

5 Measurement setup variants

5.1 Variant overview

The measurement setups for using a three axis and a single axis antenna are shown on the following pages.

ª Measurement setup with three axis antenna: sec. 5.1.1, page 5-2

ª Measurement setup with single axis antenna: sec. 5.1.2, page 5-3

Both variants are considered with regard to their suitability for mobile applications (pendulum or sweep method) or for use in a precision measurement (matrix method). The description of possible applications and the limitations in their use is intended to help you select the right antenna and measurement method for the type of measurement you want to make.

The two methods (pendulum or sweep method and matrix method) are described in detail in Appendix A for measurements using a single axis antenna.

ª Appendix A: Measurement methods using a single axis

antenna: see page A-1

The information in this section too can be of assistance when selecting the appropriate measurement method. You should in any case familiarize yourself with the correct procedure for the selected measurement method before starting measurements.

5-1

5 Measurement setup variants SRM-3000

5.1.1 Measurement setup with a three axis antenna

Mobile measurement Precision measurement

Measurement method

Measurable frequency range

Appropriate use • Rapid determination of

Usage limitations • Spatial averaging of

• Manual movement of antenna within the field

75 MHz to 3 GHz

maximum field strength within a space

• Locating a maximum value within a space where interruptions in operations are unacceptable (e.g. offices)

• Locating a maximum value in spaces where high mobility is needed (e.g. platforms, rooftops)

immissions not possible

• Measurement at various points within the space

• Sequential positioning of antenna at various heights using a tripod

• Exact measurement of a defined space with the aid of a tripod

• Spatial averaging of immissions desirable (required by some standards)

• Location of local maxima

• Rapid determination of

maximum values not possible as a large number of measurements have to be made

• Locating a maximum value within a space where interruptions in operations are unacceptable (e.g. offices)

• Locating a maximum value in spaces where high mobility is needed (e.g. platforms, rooftops)

• Locations where a tripod cannot be used (e.g. platforms, rooftops)

5-2

Table 5-1 Comparison of possible uses of a three axis antenna

SRM-3000 5 Measurement setup variants

5.1.2 Measurement setup with a single axis antenna

Note: The table below refers to customary antenna types. Two main types

are considered:

- broadband dipoles

- loop antennas

Mobile measurement (pendulum or sweep method)

Measurement method

Measurable frequency range

Appropriate use • Rapid determination of

Table 5-2 Comparison of possible uses of a single axis antenna

• Manual movement of antenna axis within the field

Depends on the antenna selected

maximum field strength within a space

• Locating a maximum value within a space where interruptions in operations are unacceptable (e.g. offices)

• Locating a maximum value in spaces where high mobility is needed (e.g. platforms, rooftops)

• Adequate experience required

Precision measurement (matrix method)

• Measurement at various points within the space

• Sequential positioning of antenna on three orthogonal axes and at various heights using a tripod

• Exact measurement of a defined space with the aid of a tripod

• Spatial averaging of immissions desirable (required by some standards)

• Location of local maxima

5-3

5 Measurement setup variants SRM-3000

Mobile measurement (pendulum or sweep method)

Usage limitations • Spatial averaging of

immissions not possible

• Underestimates strongly elliptically polarized immissions

• Undefined measurement uncertainty: Measurements with single axis antennas only detect field components that are parallel to the antenna axis. 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.

Table 5-2 Comparison of possible uses of a single axis antenna

Precision measurement (matrix method)

• Rapid determination of maximum values not possible as a large number of measurements have to be made

• Signal does not remain constant throughout the measurement

• Locating a maximum value within a space where interruptions in operations are unacceptable (e.g. offices)

• Locating a maximum value in spaces where high mobility is needed (e.g. platforms, rooftops)

• Locations where a tripod cannot be used (e.g. platforms, rooftops)

5-4

SRM-3000 5 Measurement setup variants

5.2 Assembling the measurement setup

The connecting socket for the antenna is on the top end of the SRM.

Fig. 5-1 N type connector RF input socket, 50 Ω (1) and

Note: The multi pin connector is only used with Narda antennas and

multi pin type cable connector (2)

cables. It has two functions:

• Automatic detection of the connected antenna and / or cable

• Control of three axis antenna for making isotropic measurements

5-5

5 Measurement setup variants SRM-3000

5.3 Fitting the antenna directly on the basic instrument

Connecting a Narda antenna

✓ The SRM is switched off.

1. Stand the basic instrument up vertically.

2. Place the N connector of the antenna over the N connector of the basic instrument.

3. Carefully screw down the coupling ring of the N connector of the antenna on to the N connector of the basic instrument taking care not to crossthread it.

Note: If there is resistance when you try to screw down the coupling ring, it

needs to be re-seated. Only about 4 turns are needed to establish a firm connection.

5-6

Fig. 5-2 Connecting up the N connectors

4. Place the control cable plug of the antenna on the multi pin connector of the basic instrument so that the red dot on the control cable plug and the red dot on the multi pin connector are aligned.

SRM-3000 5 Measurement setup variants

5. Press the control cable plug into the connector using the locking sleeve until the plug lock clicks into place.

Fig. 5-3 Connecting the multi pin connectors

The Narda antenna is now connected. The instrument will automatically detect the type of antenna that is connected. This information will be shown in the general instrument configuration section of the LCD panel when the instrument is switched on.

Connecting customary antenna types

You will not normally be able to connect customary types of antenna directly to the basic instrument. You will need to use a connecting cable.

ª Connecting customary antenna types using a cable: see page 5-10

5-7

5 Measurement setup variants SRM-3000

5.4 Using a cable to connect the antenna to the basic instrument

Connecting a Narda cable

A Narda cable is connected in two stages:

• Connect the Narda cable to the SRM

• Connect the Narda cable to the Narda antenna

5-8

Fig. 5-4 Connecting the SRM-3000 and antenna with a cable

Connecting the Narda cable to the SRM

✓ The SRM is switched off.

1. Stand the basic instrument up vertically.

2. Place the N connector of the cable over the N connector of the basic instrument.

SRM-3000 5 Measurement setup variants

3. Carefully screw down the coupling ring of the N connector of the cable on to the N connector of the basic instrument taking care not to cross-thread it.

Note: If there is resistance when you try to screw down the coupling ring, it

needs to be re-seated. Only about 4 turns are needed to establish a firm connection.

4. Place the control cable plug of the cable on the multi pin connector of the basic instrument so that the red dot on the control cable plug and the red dot on the multi pin connector are aligned.

5. Press the control cable plug into the connector using the locking sleeve until the plug lock clicks into place. The Narda cable is now connected. The instrument will automatically detect the type of cable that is connected. This information will be shown in the general instrument configuration section of the LCD panel when the instrument is switched on.

Connecting the Narda cable to the Narda antenna

✓ The SRM is switched off.

1. Place the N connector at the end of the cable over the N connector of the antenna.

2. Carefully screw down the coupling ring of the N connector at the end of the cable on to the N connector of the antenna taking care not to crossthread it.

Note: If there is resistance when you try to screw down the coupling ring, it

needs to be re-seated. Only about 4 turns are needed to establish a firm connection.

3. Place the control cable plug of the antenna on the multi pin connector of the cable so that the red dot on the control cable plug and the red dot on the multi pin connector are aligned.

4. Press the control cable plug into the connector using the locking sleeve until the plug lock clicks into place. The Narda antenna is now connected. The instrument will automatically detect the type of antenna that is connected. This information will be shown in the general instrument configuration section of the LCD panel when the instrument is switched on.

5-9

5 Measurement setup variants SRM-3000

Connecting customary antenna types using a cable

✓ The SRM is switched off.

1. Stand the basic instrument up vertically.

2. Place the N connector of the cable over the N connector of the basic instrument.

3. Carefully screw down the coupling ring of the N connector of the cable on to the N connector of the basic instrument taking care not to cross-thread it.

Note: If there is resistance when you try to screw down the coupling ring, it

needs to be re-seated. Only about 4 turns are needed to establish a firm connection.

4. Place the N connector at the other end of the cable over the N connector of the antenna. If the antenna is not equipped with an N connector you will need to use an adapter.

5. Carefully screw down the coupling ring of the N connector of the cable on to the N connector of the antenna taking care not to cross-thread it.

Note: If there is resistance when you try to screw down the coupling ring, it

needs to be re-seated.

5-10

SRM-3000 5 Measurement setup variants

5.5 Fitting the Narda antenna to a tripod

Special fittings are needed to attach Narda antennas to a tripod. Narda provides two different types of antenna holder.

5.5.1 Antenna holder for three axis antennas

This antenna holder can be used to attach the antenna vertically or horizontally to the tripod. In principle, the orientation has no effect on the results, since the antenna has three axes. It is still a good idea to align the antenna head roughly with the probable location of the field source to avoid any possible side effects.

Assembly

1. Screw the antenna holder horizontally or vertically on to the tripod.

2. Attach the antenna using the Velcro strips.

3. Connect the antenna to the basic instrument using a cable, see sec. 5.4, page 5-8.

Fig. 5-5 Antenna attached to holder for three axis antennas (3501/90.02),

mounted horizontally and vertically

5-11

5 Measurement setup variants SRM-3000

5.5.2 Antenna holder for single axis and three axis antennas

This holder is used to precisely align the antenna in defined positions. This serves a dual purpose:

• Single axis antennas can be aligned in three mutually perpendicular (orthogonal) directions one after the other by simple rotation, allowing you to make isotropic measurements easily (see sec. 11.2.2, page 11-6)

• three axis antennas can be precisely oriented within a field, allowing you to measure a specific axis (see sec. 11.1.2, page 11-4).

Assembly

5-12

Fig. 5-6 Single axis E field antenna (top) and single axis H field antenna (bottom)

mounted on the antenna holder for single axis and three axis antennas (3501/90.01)

SRM-3000 5 Measurement setup variants

1. Screw the antenna holder plate on to the tripod.

2. Screw the antenna holder on to the antenna holder plate.

3. Open the Velcro strips and place the antenna in the holder so that the N connector and the control cable lie in the groove provided (see fig. 5-7).

4. Close the Velcro strips.

5. Turn the antenna to the desired position (marked on the antenna holder plate) and fix it in position with the screw.

6. Connect the antenna to the basic instrument using a cable, see sec. 5.4, page 5-8

Notice: When removing the antenna from the holder, first slide it a little in

the direction of the antenna head and then remove it from the holder. This will prevent the black coating from being damaged by the spacing screws.

Fig. 5-7 Cable and N connector in guide groove

5-13

5 Measurement setup variants SRM-3000

5.6 Registering a non-Narda antenna

Note: Automatic detection of the connected antenna type is not possible if

a customary antenna is used instead of a Narda antenna. You will need to manually register / select the connected antenna on the basic instrument in order to display the results in units of field strength or as a percentage of a selected safety standard. This requires that the corresponding antenna type has been defined by the user with the aid of the “SRM-Tools” or “SRM-TS” PC software supplied and has been saved in the basic instrument. Refer to sec. 16, page 16-1 for more information.

Registering a non-Narda antenna

✓ The instrument is switched on.

1. Press the CONF button. The CONFIGURATION menu opens.

2. Select the ANTENNA/SENSOR command.

3. Press the ENT button. The ANTENNA/SENSOR menu opens.

4. Select the connected antenna type.

5. Press the ENT button. The antenna type is shown in the general instrument configuration section of the LCD panel.

5-14

SRM-3000 5 Measurement setup variants

5.7 Registering a non-Narda cable

Note: Automatic detection of the connected cable type is not possible if a

customary cable is used instead of a Narda cable. You will need to manually register / select the connected cable on the basic instrument in order to take the cable losses into account in the results. This requires that the corresponding cable type has been defined by the user with the aid of the “SRM-Tools” or “SRM-TS” PC software supplied and has been saved in the basic instrument. Refer to sec. 16, page 16-1 for more information.

Registering a non-Narda cable

✓ The instrument is switched on.

1. Press the CONF button. The CONFIGURATION menu opens.

2. Select the CABLE command.

3. Press the ENT button. The CABLE menu opens.

4. Select the cable type used and press the ENT button to confirm. The cable type is shown in the general instrument configuration section of the LCD panel.

5-15

5 Measurement setup variants SRM-3000

Notes:

5-16

6 User interface

Fig. 6-1 Display and control elements

No. Element

465

1 Rotary control

2 Softkeys

3 Function keys

4 Menu selection keys

5 On / Off switch

6 Status LED / Charge LED

7 LCD panel

Table 6-1 Display and control elements

6-1

6 User interface SRM-3000

6.1 Control elements

6.1.1 On / Off switch

Key Function

ON/OFF

Table 6-2 On / Off switch

On / Off switch.

• Starts the instrument with the same settings as were active when it was last switched off.

• Switches the instrument off (press key for longer time).

6.1.2 Menu selection keys

Key Function.

CONF Opens the CONFIGURATION menu.

• Enables: – Antenna selection. – Cable selection. – Standard selection. – Service table selection. – Cell name table selection (option). – Device information display. – Date and time settings. – General instrument properties settings. – “Safety Evaluation” mode configuration. – “Spectrum Analysis” mode configuration. – “UMTS P-CPICH Demodulation” mode configuration

(Option).

– “Time Analysis” mode configuration.

MEM Opens the MEMORY menu.

• Enables: – Display and management of stored results. – Definition and activation of special memory mode. – Comment function settings.

MODE Opens the MODE menu.

• Enables operating mode selection.

6-2

Table 6-3 Menu selection keys

SRM-3000 6 User interface

6.1.3 Softkeys

The softkey functions vary according to the menu that is displayed.

The softkeys are operated using the row of keys on the right next to the display.

6.1.4 Function keys

Note: Numerical entries can be made using either the function keys or the

rotary control. The two functions are mutually exclusive; if you use the rotary control, the function keys are disabled, and vice versa.

Function key functions

Key Function

ESC / . Cancels an operating sequence.

• Cancels the current operating step; changes in values are also canceled.

• Enables return to a higher menu level.

Key for entering a decimal point when editing a parameter.

ENT / 1 Confirms entries or activates menus.

• Ends the current operating step and confirms changes in values.

• Activates sub-menus in the CONFIGURATION menu.

Key for entering the number 1 when editing a parameter.

HOLD / 2 Pauses the measurement.

• Stops the measurement. (In stopped status you can access display and evaluation functions but you cannot edit parameters.)

• Resumes the measurement.

Key for entering the number 2 when editing a parameter.

Table 6-4 Function keys

6-3

6 User interface SRM-3000

Key Function

SAVE / 3

(abc)

DISPL / 4

(def)

MARK / 5

(ghi)

EVAL / 6

(jkl)

Saves data sets.

• Saves: – individual sets of data (spectra, tables)

Key for entering the number 3 when editing a parameter. Key for entering the characters ABC.

Activates the DISPLAY menu.

• Enables the following in “Spectrum Analysis” mode: – full screen display – selection of display scale range

(20 dB, 40 dB, 60 dB, 80 dB, 100 dB) – selection of the upper limit of the Y axis – automatic Y axis scaling if the other parameters have been

selected correctly.

• Enables the following display modes in “Safety Evaluation” mode: – full screen – as condensed table (Cond. Table)

• Enables the following display mode in “UMTS P-CPICH Demodulation” mode (option) and “Time Analysis” mode: – full screen

Key for entering the number 4 when editing a parameter. Key for entering the characters DEF.

Activates the “Peak Marker” function.

• Enables the following in “Spectrum Analysis” mode: – search for highest peak – search for next peak to the right – search for next peak to the left – search for next higher peak – search for next lower peak

Key for entering the number 5 when editing a parameter. Key for entering the characters GHI.

Activates the EVALUATION FUNCTION menu.

• Enables the following in “Spectrum Analysis” mode: – display of a list of the 20 highest peaks – integration of the results over a selected frequency range

Key for entering the number 6 when editing a parameter. Key for entering the characters JKL.

6-4

Table 6-4 Function keys

SRM-3000 6 User interface

Key Function

UNIT / 7

(nmo)

AXIS / 8

(pqrs)

ZOOM / 9

(tuv)

SETUP / 0

(wxyz)

Selects the display units.

• Opens a selection menu listing the available units. Key for entering the number 7 when editing a parameter. Key for entering the characters NMO.

Activates the MEASUREMENT MODE menu.

• If a three axis Narda antenna is used, enables: – selection of an isotropic measurement mode – selection of a measurement axis (X, Y or Z axis)

• If a single axis antenna is used, enables: – selection of the isotropic measurement method for sequential

measurement of the three spatial components of the field

being measured Key for entering the number 8 when editing a parameter. Key for entering the characters PQRS.

Activates the “Zoom” function.

• Enables:

– rapid setting of a new sweep range within the sweep range

just selected in “Spectrum Analysis” mode Key for entering the number 9 when editing a parameter. Key for entering the characters TUV.

Activates the SETUP menu.

• Enables:

– saving of user defined setups – recalling of saved setups

– deletion of saved setups Key for entering the number 0 when editing a parameter. Key for entering the characters WXYZ.

Table 6-4 Function keys

6-5

6 User interface SRM-3000

Editing parameters

Opening the numerical value entry box

⇒ Press the softkey that enables editing of a parameter (e.g. Fmin).

The box for entering the numerical value to be changed opens.

Entering the numerical value and units

ª For entry using the rotary control, see sec. 6.1.5, page 6-7.

1. Use the function keys to enter the first digit of the desired numerical value. The rotary control is disabled as soon as you have entered the first digit. The digit you entered will be displayed. The previous value is deleted. The softkeys will now be labeled with the possible units and the backspace function.

2. Enter all the remaining digits of the numerical value, using the decimal point if necessary.

3. Press the softkey that is labeled with the desired units. The entry box now shows the complete numerical value and units.

Using the BACKSPACE softkey

Incorrect entries can be deleted by pressing the BACKSPACE softkey.

⇒ Press the BACKSPACE softkey.

The unit or digit furthest to the right will be deleted.

6-6

Completing an entry

⇒ Press the ENT key.

The entry box closes. The values defined are displayed in the “Instrument configuration” section. The function keys are enabled. The softkey functions change.

SRM-3000 6 User interface

6.1.5 Rotary control

Note: Numerical entries can be made using either the function keys or the

rotary control. The two functions are mutually exclusive; if you use the rotary control, the function keys are disabled, and vice versa. The first step in setting a parameter determines which method of entry is selected.

Opening the numerical value entry box

⇒ Press the softkey that enables editing of a parameter (e.g. Fmin).

The box for entering the numerical value to be changed opens. One digit of the displayed value is shown highlighted. The position of this digit defines the step width when the rotary control is used to change the value. Examples: 100 = step width 100, 100 = step width 10, 100 = step width 1

Using the rotary control

⇒ Turn the rotary control one step to the right.

The original value will increase by one digit corresponding to the current step width. The > and < softkeys for changing the step width are activated. The function keys are disabled.

– or –

⇒ Turn the rotary control one step to the left.

The original value will decrease by one digit corresponding to the current step width. The > and < softkeys for changing the step width are activated. The function keys are disabled.

Changing the step width

⇒ Press the > softkey.

The highlighted digit moves one position to the right. The step width is reduced by a factor of 10.

– or –

⇒ Press the < softkey.

The highlighted digit moves one position to the left. The step width is increased by a factor of 10.

6-7

6 User interface SRM-3000

Completing an entry

⇒ Press the ENT key.

The entry box closes. The values defined are displayed in the “Instrument configuration” section. The function keys are enabled. The softkey functions change.

Note: The rotary control can only change the value of parameters within

the pre-set range limits.

6.1.6 Keys for optimizing the display

Key Function

CONTRAST key.

• Opens the “Adjust contrast” box for setting the display contrast.

BRIGHT key.

• Switches the display backlight on or off.

6-8

Table 6-5 keys for optimizing the display

Setting the display contrast

1. Press the CONTRAST key. The display contrast is shown as a bar graph.

2. Use the rotary control to adjust the contrast.

3. Press the ENT key. The contrast is adjusted. The bar graph is no longer displayed.

Switching on the backlight

⇒ Press the BRIGHT key for longer than 2 seconds.

The backlight switches on permanently.

Switching off the backlight

⇒ When the backlight is switched on permanently, press the BRIGHT key.

The backlight switches off.

SRM-3000 6 User interface

6.2 Operating status display

Element State Function

Status LED Green Indicates readiness for use

Red Instrument is being initialized

Error detected

Charge LED Red Battery is being charged

Green Charging cycle has ended

AC Adapter / Charger is still connected to the instrument

Table 6-6 LED overview

6-9

6 User interface SRM-3000

6.3 LCD panel elements

123

Fig. 6-2 LCD panel in “Spectrum Analysis” mode (example)

6-10

SRM-3000 6 User interface

No. Description

1 General information

The “General information” section gives information about the current instrument status.

The following data are displayed here:

• type of antenna connected

• type of cable connected

• selected operating mode

• active standard

(if a standard has been activated as reference)

• battery pack charge status

• selected measurement range

2 Evaluation tools

The “Evaluation tools” section indicates the status of the active evaluation tools, e.g. current position of the marker.

3 Softkeys

The softkey labels change according to the menu that is being displayed. The softkeys are operated using the row of keys to the right next to the display.

4 Instrument configuration

The “Instrument configuration” section displays the user settings for the individual operating modes.

5 Measurement data

The measurement result display depends on the operating mode and evaluation tools that have been selected. Refer to the sections covering the operating modes for more details.

Table 6-7 Key to LCD panel elements

ª More detailed information about the LCD panel is given in the sections

dealing with the different operating modes.

6-11

6 User interface SRM-3000

6.4 External connectors

There are two sockets on the top side of the SRM-3000. These are for connecting the antenna and the control cable.

Fig. 6-3 Antenna and control cable connector sockets

No. Function

1 Antenna connector socket

• N connector

2 12 pole socket (multi pin connector) for connecting the control cable

• If a Narda antenna or Narda cable is used this socket automatically detects the antenna and cable.

6-12

Table 6-8 Antenna and control cable connector sockets

On the base of the instrument you will find the battery holder on the left and three further external connections on the right: USB, serial interface, AC Adapter / Charger.

123 4

Fig. 6-4 Battery holder and external connectors

SRM-3000 6 User interface

No. Function

1 Battery holder

2 USB interface for connecting to a computer (PC)

3 Serial data interface (RS 232) for connecting to a computer (PC):

• 115 000 Baud

• 8 data bits

• 1 stop bit

• No parity

• Xon / Xoff protocol

4 AC Adapter / Charger connection

• Nominal voltage: 9 V

Table 6-9 Battery holder and external connectors

6-13

6 User interface SRM-3000

Notes:

6-14

7 “Safety Evaluation” mode

7.1 “Safety Evaluation” mode functions

“Safety Evaluation” mode was specially developed for evaluating field strength exposure in a multi frequency environment. It provides an overview of exposure values in units of field strength or as a percentage of a selected safety standard for certain frequency bands or “services”. This makes an immediate assessment of conformance to defined limit values possible right at the point of measurement, as well as indicating the contribution made by frequency bands of interest to the overall exposure level.

The service tables used as the basis for “Safety Evaluation” mode are defined and transferred to the instrument using the “SRM-Tools” or “SRM-TS” PC software.

ª Refer to sec. 16, page 16-1 for more information about this.

7.2 Selecting the operating mode

1. Press the MODE button. The OPERATING MODES menu opens.

Fig. 7-1 OPERATING MODES menu

2. Use the rotary control to highlight “Safety Evaluation”.

7-1

7 “Safety Evaluation” mode SRM-3000

3. Press the ENT button. The measurement menu for “Safety Evaluation” mode opens. The softkey functions change.

123

Fig. 7-2 Measurement menu for “Safety Evaluation” mode

No. Description Explanation

1 Operational status:

Battery Battery charge state

Mode Operating mode

Meas. Range Input attenuator setting (input sensitivity)

2 Antenna parameters

Ant Selected / connected antenna

Cbl Selected / connected measurement cable

- Name of service table used

3 - Softkey functions

Table 7-1 Key to “Safety Evaluation” mode measurement menu

7-2

SRM-3000 7 “Safety Evaluation” mode

No. Description Explanation

4 Table of results (individual results)

5 Total Total result

6 Progress display (rotating bar)

7 Measurement parameters display

Processing Time Time to perform the measurement

No. of Runs Number of times measurement performed

AVG Number of averages.

Result Result type

Fmin Lower frequency limit

Fmax Upper frequency limit

RBW Resolution bandwidth.

8 Isotropic result Measurement type:

Table 7-1 Key to “Safety Evaluation” mode measurement menu

Only displayed for “Result Type” = “AVERAGE” and “MAX AVERAGE”.

(ACT, MAX, AVERAGE, MAX AVERAGE)

Only displayed if “RBW Automatic” set to OFF in the CONFIGURATION menu.

X, Y, Z axis measurement or isotropic measurement

7-3

7 “Safety Evaluation” mode SRM-3000

7.3 Selecting the service to be measured

All the frequency bands (or services) that are of interest when assessing field strength exposure are usually collected together into a so-called service table. “Safety Evaluation” mode is based on the selection and activation of such a table. The desired service table is selected using the CONFIGURATION menu (see sec. 14.6, page 14-7).

Note: If there is no active service table when you select “Safety Evaluation”

mode, a warning message will appear to remind you of this. “Safety Evaluation” mode cannot be used if there are no service tables available on the instrument.

If an antenna combined with a cable or an antenna and a separate cable are used together, only those services which are within the frequency range of the antenna and / or the cable will be taken into account in “Safety Evaluation” mode.

“Safety Evaluation” mode provides two methods of further restricting the list of services to be measured:

• Selection of the first service to be measured in the frequency range (restricts the list upwards)

• Selection of the last service to be measured in the frequency range (restricts the list downwards)

7.3.1 Restricting the list of services to be measured using the first service

✓ The “Safety Evaluation” mode measurement menu is displayed.

1. Press the Sel. first service softkey. The “Select First Service” selection box opens showing the list of first services to be measured.

2. Use the rotary control to highlight the desired first service to be measured.

3. Press the ENT button. The “Measurement parameters” pane of the measurement menu will display the lower limit frequency of the selected service as the minimum measurement frequency.

Note: If the newly selected service is after the last service just set in the

table, the list of services to be measured will be reduced to a single service, i.e. to the service just selected.

7-4

SRM-3000 7 “Safety Evaluation” mode

7.3.2 Restricting the list of services to be measured using the last service

✓ The “Safety Evaluation” mode measurement menu is displayed.

1. Press the Sel. last service softkey. The “Select Last Service” selection box opens showing the list of last services to be measured.

2. Use the rotary control to highlight the desired last service to be measured.

3. Press the ENT button. The “Measurement parameters” pane of the measurement menu will display the upper limit frequency of the selected service as the maximum measurement frequency.

Note: If the newly selected service is before the first service just set in the

table, the list of services to be measured will be reduced to a single service, i.e. to the service just selected.

7.3.3 Restoring the original list of services to be measured

✓ The “Safety Evaluation” mode measurement menu is displayed.

⇒ Press the Sel. all services softkey.

All the services in the service table are displayed.

7-5

7 “Safety Evaluation” mode SRM-3000

7.4 Setting the measurement range

The system sensitivity depends on the input attenuator setting, which is determined by the “Measurement Range” parameter. A high measurement sensitivity avoids any falsification of the results that might occur due to the intrinsic noise of the device. However, the device must not be overloaded. Overloading can also be caused by signals that are outside the frequency range of the services being measured, such as those from a powerful radio transmitter which might be superimposed on the mobile telephone signals that you actually want to measure.

For the above reasons, the SRM allows you to

• select the measurement range manually,

• automatically search for the best measurement range,

• apply noise suppression.

The measurement range you select will apply to all operating modes, so you do not have to set it each time you change from one operating mode to another.

7.4.1 Setting the measurement range manually

This method can be used if you know the field situation.

1. Press the Meas Range softkey. The “Set Measurement Range (MR)” selection box opens showing a list of possible input sensitivities.

2. Use the rotary control to highlight the desired input sensitivity.

3. Press the ENT button. The selected input sensitivity is set.

7-6

SRM-3000 7 “Safety Evaluation” mode

Fig. 7-3 “Set Measurement Range (MR)” selection box

7.4.2 Search for the best measurement range

This method is best if you do not know the field situation.

1. Press the Meas Range softkey. The “Set Measurement Range (MR)” selection box opens; the fourth softkey is labeled MR Search.

2. Press the MR Search softkey. The message “Searching for best measurement range. Please wait.” is displayed. The SRM makes a background measurement over the entire frequency range covered by the antenna you are using. This will take several seconds. When the measurement is finished, the SRM automatically sets the measurement range to the best value and displays the normal measurement menu again.

Note: Press the ESC key if you want to stop the automatic setting process.

ª Selecting the parameters for the measurement range search (Configure

General): see page 14-16

7-7

7 “Safety Evaluation” mode SRM-3000

7.4.3 Using noise suppression (Noise Threshold)

The intrinsic noise of the device is present in all frequency ranges, including those that are not occupied with payload signals. When you perform a spectrum analysis and display the results graphically, it is easy to see when a spectral line disappears into the noise floor. You can set a threshold so that you can also make this distinction when the results are presented numerically as in “Safety Evaluation” mode. If the result is below this threshold level, the device displays the threshold value preceded by the “<” character (i.e. less than the threshold value) instead of the actual measured value.

You can set threshold levels of 0, 3, 6, 10, 15 and 20 dB. These values are relative to the level of the intrinsic noise floor.

Selecting the threshold value for noise suppression

1. Press the CONF key. The CONFIGURATION menu opens.

2. Use the rotary control to highlight “Configure Safety Evaluation Mode”.

3. Press the ENT key. The current settings will be displayed.

4. To change the setting, use the rotary control to highlight “Noise Threshold Factor”.

5. Press the ENT key.

6. Use the rotary control to select a value between 0 and 20 dB.

7-8

Fig. 7-4 CONFIGURATION SAFETY EVALUATION menu;

setting the threshold value for noise suppression (Noise Threshold Factor)

SRM-3000 7 “Safety Evaluation” mode

7. Press the ENT key. The threshold value is set.

8. Press the ESC key twice to return to the measurement menu.

Activating and deactivating noise suppression

1. Press the CONF key. The CONFIGURATION menu opens.

2. Use the rotary control to highlight “Configure Safety Evaluation Mode”.

3. Press the ENT key. The current settings will be displayed.

4. To change the setting, use the rotary control to highlight “Noise Threshold”.

5. Press the ENT key.

6. Use the rotary control to select “ON” or “OFF”. Automatic noise suppression is activated or deactivated.

7. Press the ESC key twice to return to the measurement menu. When noise suppression is activated, the measurement menu displays the set threshold value preceded by the “<” character for all numerical measurement values that are below the threshold value.

7-9

7 “Safety Evaluation” mode SRM-3000

7.5 Selecting the result type

The result type determines how the values recorded are evaluated and displayed. One value is displayed for each service.

ACT The actual (latest) measured value is displayed. MAX The maximum measured value is displayed. AVERAGE The average of the measured values is taken ofer a

specified number of results or a specified time. The resulting value is displayed. ª Selecting the averaging parameters: see page 7-11

MAX AVERAGE The maximum of all the averaged values is displayed.

Selecting the result type

1. Press the Result type softkey. A selection box showing a list of possible result types opens. If the “Spatial Averaging” option has been activated, the fifth softkey will be labeled Spatial AVG. Spatial Averaging in “Time Analysis” mode: see page 12-16

2. Use the rotary control to highlight the desired result type.

3. Press the ENT button. The selected result type is shown in the “Measurement parameters” pane of the measurement menu.

7-10

SRM-3000 7 “Safety Evaluation” mode

7.6 Selecting the averaging parameters

The SRM provides two ways of averaging the results:

• Averaging over a specified number of individual results (Number of Averages)

• Averaging over a specified time (Average Time)

You can set both parameters in the CONFIGURATION menu. They will be effective only when you select “AVERAGE” or “MAX AVERAGE” evaluation mode.

Selecting averaging over a specified number of results (Number of Averages)

1. Press the CONF key. The CONFIGURATION menu opens.

2. Use the rotary control to highlight “Configure Safety Evaluation Mode”.

3. Press the ENT key. The current settings will be displayed.

Fig. 7-5 CONFIGURATION SAFETY EVALUATION menu

4. To change the setting, use the rotary control to highlight “Average Type”.

5. Press the ENT key.

6. Use the rotary control to set the command to “Number of Averages”.

7. Press the ENT key.

8. Use the rotary control to highlight “Number of Averages”.

9. Press the ENT key.

7-11

7 “Safety Evaluation” mode SRM-3000

10.Use the rotary control to set the number of averages (between 4 and 64).

11. Press the ENT key.

12.Press the ESC key twice to return to the measurement menu. The selected averaging parameter is shown in the “Measurement parameter” pane of the measurement menu.

Selecting averaging over a specified time (Average Time)

1. Press the CONF key. The CONFIGURATION menu opens.

2. Use the rotary control to highlight “Configure Safety Evaluation Mode”.

3. Press the ENT key. The current settings will be displayed.

4. To change the setting, use the rotary control to highlight “Average Type”.

5. Press the ENT key.

6. Use the rotary control to set the command to “Average Time”.

7. Press the ENT key.

8. Use the rotary control to highlight “Average Time”.

9. Press the ENT key.

10.Use the rotary control to set the averaging time (between 1 and 30 min).

11. Press the ENT key.

12.Press the ESC key twice to return to the measurement menu. The selected averaging parameter is shown in the “Measurement parameter” pane of the measurement menu.

7-12

SRM-3000 7 “Safety Evaluation” mode

7.7 Selecting the resolution bandwidth (RBW)

You will not normally need to enter the resolution bandwidth (RBW) manually in “Safety Evaluation” mode. In the default setting of the SRM (“RBW Automatic”), the device selects the resolution bandwidth so that the narrowest band service being measured is resolved finely enough for an accurate measurement. Nevertheless, you can set the resolution bandwidth manually. As a rule, the finer the resolution, the longer the measurement will take.

The actual setting can be seen from the lowermost softkey label:

(no label) RBW Automatic (default setting) RBW You must enter the resolution bandwidth manually.

Deactivating automatic resolution bandwidth selection in the CONFIGURATION menu

1. Press the CONF key. The CONFIGURATION menu opens.

ª Also refer to sec. 14, page 14-1.

2. Use the rotary control to highlight “Configure Safety Evaluation Mode”.

3. Press the ENT key. The current settings will be displayed.

Fig. 7-6 CONFIGURATION SAFETY EVALUATION menu

7-13

7 “Safety Evaluation” mode SRM-3000

4. To change the setting, use the rotary control to highlight “RBW Automatic”.

5. Press the ENT key.

6. Use the rotary control to set the command to “OFF”.

7. Press the ENT key.

8. Press the ESC key twice to return to the measurement menu. The lowermost softkey is now labeled RBW. The selected value is shown in the “Measurement parameter” pane of the measurement menu.

Defining the resolution bandwidth in the measurement menu

✓ “RBW Automatic” is set to “OFF” in the CONFIGURATION menu. ✓ The “Safety Evaluation” mode measurement menu is open.

1. Press the RBW softkey. A selection box showing a list of the possible resolution bandwidths opens.

2. Use the rotary control to highlight the setting you want.

3. Press the ENT key. The selected value is shown in the “Measurement parameter” pane of the measurement menu.

Note: A narrow resolution bandwidth will result in a long measurement

time. You can see that the device is working by looking at the progress display (rotating bar) in the measurement menu (see fig. 7-2).

7-14

SRM-3000 7 “Safety Evaluation” mode

7.8 Selecting display options

The following display options can be selected:

• Units for the results

• Full screen display of the service table

• Display of results as a detailed table or a condensed table

7.8.1 Selecting the units for the results

✓ “Safety Evaluation” mode is set.

1. Press the UNIT button. The “Select Display Unit” selection box opens.

2. Use the rotary control to select the desired units.

3. Press the ENT button. The measurement results will be displayed with the selected units in the “Safety Evaluation” mode measurement menu.

Fig. 7-7 “Select Display Unit” selection box

Refer to sec. 8.8.1, page 8-14 for a detailed description of the units that can be set.

7-15

7 “Safety Evaluation” mode SRM-3000

7.8.2 Selecting display options

✓ “Safety Evaluation” mode is set.

⇒ Press the DISPL button.

The softkey functions change.

Fig. 7-8 Softkeys for selecting the display type

Selecting “Full Screen” display

⇒ Press the Full Screen softkey.

The entire display area is used to display the service table.

7-16

Fig. 7-9 “Full Screen” display

SRM-3000 7 “Safety Evaluation” mode

Displaying the normal size service table (Detailed Table)

⇒ Press any button.

The service table will be displayed normal size again.

Displaying the condensed service table (Condensed Table)

⇒ Press the Cond. Table softkey.

The display switches to the condensed table display. The softkey function changes to “Detail Table”.

Fig. 7-10 “Cond. Table” display

Displaying the detailed service table (Detailed Table)

⇒ Press the Detail Table softkey.

The display switches to the detailed table display. The softkey function changes to “Cond. Table”.

7-17

7 “Safety Evaluation” mode SRM-3000

Notes:

7-18

8 “Spectrum Analysis” mode

8.1 Operating mode functions

In “Spectrum Analysis” mode, you can display all the field components in the selected environment for an overview of the detected spectrum or to determine maximum values. Complete evaluation of the results can be performed directly at the measurement site.

8.2 Selecting the operating mode

1. Press the MODE button. The OPERATING MODES menu opens.

Fig. 8-1 OPERATING MODES menu

2. Use the rotary control to highlight “Spectrum Analysis”.

3. Press the ENT button. The measurement menu for “Spectrum Analysis” mode opens. The softkey functions change.

8-1

8 “Spectrum Analysis” mode SRM-3000

134

Fig. 8-2 Measurement menu for “Spectrum Analysis” mode

No. Name Description

1 Operating states

Battery Battery charge state

Mode Operating mode

Meas. Range Input attenuator setting (input sensitivity)

8-2

2 Antenna parameters

Type Selected / connected antenna

Cbl Selected / connected measurement cable

3 Digital result display

Fr (Pk ...) Frequency display, e.g. for the marker position.

The display depends on the chosen settings.

Val Level value e.g. for the marker position.

The display depends on the chosen settings.

Table 8-1 Key to “Spectrum Analysis” mode measurement menu

SRM-3000 8 “Spectrum Analysis” mode

No. Name Description

4 - Softkey functions

5- Marker

6 Graphic result display (spectrum)

- Frequency spectrum (graphic)

7 Measurement parameters display

Sweep Time Sweep time (the total time of the complete process to

No. of Runs Number of times measurement performed

AVG Number of averages.

Fcent Center frequency

Fspan Frequency span

Result Result type

Fmin Lower frequency limit of spectrum

determine the isotropic result is shown here for three axis antennas)

Only displayed for “Trace Type” = “AVERAGE” and “MAX AVERAGE”.

Fmax Upper frequency limit of spectrum

RBW Resolution bandwidth

8 Isotropic result Display of measurement type:

X, Y, Z axis measurement or isotropic measurement

9 mV/m (dBV ...) Y axis scale units

- X axis scale

10 - Reference line, reference point

Table 8-1 Key to “Spectrum Analysis” mode measurement menu

8-3

8 “Spectrum Analysis” mode SRM-3000

8.3 Selecting the frequency range

There are two ways to set the frequency range in “Spectrum Analysis” mode:

• By entering the upper and lower frequencies

• By entering the center frequency and frequency span

8.3.1 Selecting the frequency range entry method

The lowermost softkey in the “Spectrum Analysis” mode measurement menu toggles between the functions “Fmin/Fmax” and “Fcent/Fspan”.

• If the toggle function shown is “Fcent/Fspan”, the first two softkeys have the functions “Fmin” and “Fmax”. The frequency range is defined by setting the upper and lower frequencies.

• If the toggle function shown is “Fmin/Fmax”, the first two softkeys have the functions “Fcent” and “Fspan”. The frequency range is defined by setting the center frequency and frequency span.

Note: Both pairs of values are always displayed in the “Measurement

parameters” pane of the measurement menu. The display automatically adjusts to the last frequency range defined.

8.3.2 Defining the frequency range by upper and lower frequencies

✓ The toggle key function is “Fcent/Fspan”.

1. Press the Fmin softkey. An entry box opens where you can enter the value of the lower frequency limit.

2. Enter the value using the function keys or the rotary control. As soon as the first digit is entered, the softkey functions change to show the possible units.

8-4

SRM-3000 8 “Spectrum Analysis” mode

Fig. 8-3 “Set Fmin” entry box

3. Use the appropriate softkey to enter the units.

4. Press the ENT button. The lower frequency limit you defined will be displayed in the “Measurement parameters” pane of the measurement menu.

5. Press the Fmax softkey and enter the upper frequency limit in the same way. The display frequency axis automatically adjusts to the selected frequency range. The upper frequency limit you defined will be displayed in the “Measurement parameters” pane of the measurement menu. The values of Fcent and Fspan are also adjusted to match your entries and now correspond to the defined frequency range.

8-5

8 “Spectrum Analysis” mode SRM-3000

8.3.3 Defining the frequency range by center frequency and frequency span

✓ The toggle key function is “Fmin/Fmax”.

1. Press the Fcent softkey. An entry box opens where you can enter the value of the frequency that is to be at the center of the desired frequency sweep range.

2. Enter the value using the function keys or the rotary control. As soon as the first digit is entered, the softkey functions change to show the possible units.

8-6

Fig. 8-4 “Set Fcent” entry box

3. Use the appropriate softkey to enter the units.

4. Press the ENT button. The center frequency you defined will be displayed in the “Measurement parameters” pane of the measurement menu.

5. Press the Fspan softkey and enter the value in the same way for the frequency band to be examined by the spectrum analyzer. The display frequency axis automatically adjusts to the selected frequency range. The frequency span you defined will be displayed in the “Measurement parameters” pane of the measurement menu. The values of “Fmin” and “Fmax” are also adjusted to match your entries and now correspond to the defined frequency range.

SRM-3000 8 “Spectrum Analysis” mode

8.4 Setting the resolution bandwidth (RBW)

The resolution bandwidth (RBW) characterizes the selectivity of the spectrum analyzer in respect of signals having the same amplitude. Only signals which are separated by a frequency greater than the defined resolution bandwidth can be distinguished from one another.

Tip: An appropriately small value of RBW must be selected for signals that

are very closely spaced in frequency. A larger resolution bandwidth can be selected for broadband signals.

Setting methods

The SRM-3000 can automatically define a suitable resolution bandwidth dependent on the selected frequency span. Two options for this are provided in the CONFIGURATION menu:

FAST SWEEP The RBW is set so that the optimum sweep time

can be achieved.

HIGH RESOLUTION The RBW is set so that the highest resolution can

be achieved.

You can alternatively set the resolution bandwidth directly from a range of preset values. This option is available when the setting “OFF” is selected in the CONFIGURATION menu.

ª The criteria governing the resolution bandwidths available for the

currently selected frequency span are explained in Appendix B.

Activating automatic resolution bandwidth selection in the CONFIGURATION menu

1. Press the CONF button. The CONFIGURATION menu opens.

ª Also refer to sec. 14, page 14-1.

2. Use the rotary control to highlight “Configure Spectrum Analysis Mode”.

3. Press the ENT button.

4. Use the rotary control to highlight “RBW Automatic”.

5. Press the ENT button. The current setting will be highlighted.

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8 “Spectrum Analysis” mode SRM-3000

6. Use the rotary control to highlight “FAST SWEEP” or “HIGH RESOLUTION”.

Fig. 8-5 CONFIGURATION SPECTRUM ANALYSIS (RBW Automatic) menu

7. Press the ENT button.

8. Return to the measurement menu of “Spectrum Analysis” mode by pressing the MODE button and selecting “Spectrum Analysis”. Automatic resolution bandwidth selection is activated. The RBW softkey is no longer displayed.

8-8

Defining the resolution bandwidth in the measurement menu

✓ “RBW Automatic” in the CONFIGURATION menu is set to “OFF”. ✓ The “Spectrum Analysis” mode measurement menu is open.

1. Press the RBW softkey. A selection box opens showing a list of possible resolution bandwidths.

2. Use the rotary control to highlight the desired setting.

3. Press the ENT button. The selected value will be shown in the “Measurement parameters” pane of the measurement menu. The spectrum is re-drawn using the RBW.

SRM-3000 8 “Spectrum Analysis” mode

8.5 Setting the measurement range

The system sensitivity depends on the input attenuator setting, which is determined by the “Measurement Range” parameter. A high measurement sensitivity avoids any falsification of the results that might occur due to the intrinsic noise of the device. However, the device must not be overloaded. Overloading can also be caused by signals that are outside the set frequency range, such as those from powerful UHF and VHF broadcast transmitters.

For the above reasons, the SRM allows you to

• select the measurement range manually,

• automatically search for the best measurement range.

Note: The measurement range you select will apply to all operating modes,

so you do not have to set it each time you change from one operating mode to another.

8.5.1 Setting the measurement range manually

This method can be used if you know the field situation.

1. Press the Meas Range softkey. The “Set Measurement Range (MR)” selection box opens showing a list of possible input sensitivities.

2. Use the rotary control to highlight the desired input sensitivity.

3. Press the ENT button. The selected input sensitivity is set.

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8 “Spectrum Analysis” mode SRM-3000

Fig. 8-6 “Set Measurement Range (MR)” selection box

8.5.2 Search for the best measurement range

This method is best if you do not know the field situation.

1. Press the Meas Range softkey. The “Set Measurement Range (MR)” selection box opens; the fourth softkey is labeled MR Search.

Note: Press the ESC key if you want to stop the automatic setting process.

ª Selecting the parameters for the measurement range search (Configure

General): see page 14-16

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SRM-3000 8 “Spectrum Analysis” mode

8.6 Selecting the result type

The result type defines how the values recorded are displayed.

ACT The rms value of the current (actual) spectral line is

displayed.

MAX The maximum value occurring for all spectral lines since

activation of MAX trace type is displayed.

AVERAGE The average of the measured values is taken over a

specified number of results or a specified time. The resulting value is displayed. ª Selecting the averaging parameters: see page 8-12

MAX AVERAGE The maximum value of all the averaged spectra is

displayed.

Selecting the result type

1. Press the Result type softkey. The “Select Result Type” selection box opens showing a list of possible result types. If the “Spatial Averaging” option has been activated, the fifth softkey will be labeled Spatial AVG. Spatial Averaging in “Spectrum Analysis” mode: see page 12-14

2. Use the rotary control to highlight the desired result type.

3. Press the ENT button. The selected result type is shown in the “Measurement parameters” pane of the measurement menu.

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8 “Spectrum Analysis” mode SRM-3000

8.7 Selecting the averaging parameters

The SRM provides two ways of averaging the results:

• Averaging over a specified number of individual results (Number of Averages)

• Averaging over a specified time (Average Time)

You can set both parameters in the CONFIGURATION menu. They will be effective only when you select “AVERAGE” or “MAX AVERAGE” evaluation mode.

Selecting averaging over a specified number of results (Number of Averages)

1. Press the CONF key. The CONFIGURATION menu opens.

2. Use the rotary control to highlight “Configure Spectrum Analysis Mode”.

3. Press the ENT key. The current settings will be displayed.

4. To change the setting, use the rotary control to highlight “Average Type”.

5. Press the ENT key.

6. Use the rotary control to set the command to “Number of Averages”.

7. Press the ENT key.

8. Use the rotary control to highlight “Number of Averages”.

9. Press the ENT key.

10.Use the rotary control to set the number of averages (between 4 and 64).

11. Press the ENT key.

12.Press the ESC key twice to return to the measurement menu. The selected averaging parameter is shown in the “Measurement parameter” pane of the measurement menu.

8-12

Selecting averaging over a specified time (Average Time)

1. Press the CONF key. The CONFIGURATION menu opens.

2. Use the rotary control to highlight “Configure Spectrum Analysis Mode”.

3. Press the ENT key. The current settings will be displayed.

4. To change the setting, use the rotary control to highlight “Average Type”.

5. Press the ENT key.

6. Use the rotary control to set the command to “Average Time”.

SRM-3000 8 “Spectrum Analysis” mode

Fig. 8-7 CONFIGURATION SPECTRUM ANALYSIS menu

7. Press the ENT key.

8. Use the rotary control to highlight “Average Time”.

9. Press the ENT key.

10.Use the rotary control to set the averaging time (between 1 and 30 min).

11. Press the ENT key.

12.Press the ESC key twice to return to the measurement menu. The selected averaging parameter is shown in the “Measurement parameter” pane of the measurement menu.

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8 “Spectrum Analysis” mode SRM-3000

8.8 Selecting the display

This section describes how to optimize the display of measurement results in “Spectrum Analysis” mode.

8.8.1 Selecting the units

The Y axis units are selected using the UNIT button.

The following power and voltage units are available if an antenna is not connected or selected:

dBm Power level referred to 1 mW dBV Voltage level referred to 1 V dBmV Voltage level referred to 1 mV dBµV Voltage level referred to 1 µV

The following units are available if an antenna is connected or selected:

V/m Electric field strength

(calculated using the characteristic impedance of a vacuum Zo = 377 Ω if not measured directly)

A/m Magnetic field strength

(calculated using the characteristic impedance of a vacuum Zo = 377 Ω if not measured directly)

dBV/m Electric field strength

(expressed logarithmically, referred to 1 V/m)

dBmV/m Electric field strength

(expressed logarithmically, referred to 1 mV/m)

dBµV/m Electric field strength

(expressed logarithmically, referred to 1 µV/m)

dBA/m Magnetic field strength

(expressed logarithmically, referred to 1 A/m)

W/m

mW/cm

% % referred to a selected safety standard

Power density (calculated using the characteristic impedance of a vacuum Zo = 377 Ω)

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SRM-3000 8 “Spectrum Analysis” mode

✓ “Spectrum Analysis” mode is set.

1. Press the UNIT button. The “Select Display Unit” selection box opens showing a list of available units.

Fig. 8-8 “Select Display Unit” selection box

2. Use the rotary control to highlight the desired units.

3. Press the ENT button. The measurement results will be displayed with the selected units in the “Spectrum Analysis” mode measurement menu.

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8 “Spectrum Analysis” mode SRM-3000

8.8.2 Selecting the display mode and scaling

The display mode (full screen), scaling and the Y axis reference value are set using the DISPL button.

✓ “Spectrum Analysis” mode is set. ⇒ Press the DISPL button.

The softkey functions change.

Fig. 8-9 Softkeys for selecting the display mode and scaling

8-16

SRM-3000 8 “Spectrum Analysis” mode

Selecting the display mode

⇒ Press the Full Screen softkey.

The entire display area is used to display the spectrum.

Fig. 8-10 “Full Screen” display mode

Displaying the spectrum in normal size

⇒ Press any button.

The display mode reverts to the normal size spectrum display.

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8 “Spectrum Analysis” mode SRM-3000

Selecting the Y axis scaling

✓ The DISPL button has been pressed. ✓ The corresponding softkeys are displayed.

1. Press the Y-Scale Range softkey. The “Select Y-Scale Range” selection box opens.

Fig. 8-11 “Select Y-Scale Range” selection box

8-18

2. Use the rotary control to highlight the desired value.

3. Press the ENT button. The Y axis will be displayed with the selected scale range in the “Spectrum Analysis” mode measurement menu.

Selecting the Y axis reference point

✓ The DISPL button has been pressed. ✓ The corresponding softkeys are displayed.

1. Press the Y-Scale Ref softkey. The “Select Y-Scale Reference” selection box is displayed. The Auto softkey is displayed.

SRM-3000 8 “Spectrum Analysis” mode

Fig. 8-12 “Select Y-Scale Reference” selection box

2. Use the rotary control to highlight the desired value.

3. Press the ENT button. The Y axis reference point is set to the selected value in the “Spectrum Analysis” mode measurement menu.

Note: The reference value is shown in the selected units.

Selecting the reference value automatically

✓ The “Select Y-Scale Reference”selection box is displayed. ✓ The Auto softkey is displayed.

⇒ Press the Auto softkey.

The Y-axis reference value is the same as the measurement range. The Y-axis reference adjusts automatically when you change the measurement range. The selection box closes.

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8 “Spectrum Analysis” mode SRM-3000

8.8.3 Rapidly changing the frequency span (Zoom function)

Zoom functions are provided to allow rapid alteration in the frequency span. An area of interest within the selected frequency span is marked and the upper and lower frequency limits of the marked frequency range are then set as the limits of the new frequency span.

Note: Executing this function starts a new measurement. New

measurement parameter values may also be set automatically, e.g. a new resolution bandwidth.

The individual settings are described in the sections below.

✓ “Spectrum Analysis” mode is set. ⇒ Press the ZOOM button.

The softkey functions change. The zoom area is defined by two vertical lines on the display. The frequencies at the line positions are shown as Zmin and Zmax in the measurement menu. Zcent is the frequency at the center of the zoom area.

8-20

Fig. 8-13 Softkeys for selecting the zoom settings

NARDA SRM-3000 Operating Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

1Introduction

1.1 Application

1.2 About this instrument

1.3 About this Manual

2 Safety instructions

2.1 Before connecting up

2.2 Correct use

2.3 AC Adapter / Charger

2.4 Faults and excessive stresses

2.5 Disposal in accordance with local regulations

3 Preparation for use

3.1 Unpacking

3.1.1 Packaging

3.1.2 Checking the instrument for transport damage

3.1.3 Recovery after transport and storage

3.2 Power supply

3.2.1 Battery pack operation

3.2.2 Handling the battery pack

3.2.3 Operation from AC Adapter / Charger

3.3 Switching the instrument on and off

3.3.1 Switching on

3.3.2 Switching off

4 Instrument concept

4.1 SRM as a field strength meter

4.1.1 Overall concept

4.1.2 Basic instrument

4.1.3 Antennas

4.1.4 Cable

4.2 SRM as a spectrum analyzer

5 Measurement setup variants

5.1 Variant overview

5.1.1 Measurement setup with a three axis antenna

5.1.2 Measurement setup with a single axis antenna

5.2 Assembling the measurement setup

5.3 Fitting the antenna directly on the basic instrument

5.4 Using a cable to connect the antenna to the basic instrument

5.5 Fitting the Narda antenna to a tripod

5.5.1 Antenna holder for three axis antennas

5.5.2 Antenna holder for single axis and three axis antennas

5.6 Registering a non-Narda antenna

5.7 Registering a non-Narda cable

6 User interface

6.1 Control elements

6.1.1 On / Off switch

6.1.2 Menu selection keys

6.1.3 Softkeys

6.1.4 Function keys

6.1.5 Rotary control

6.1.6 Keys for optimizing the display

6.2 Operating status display

6.3 LCD panel elements

6.4 External connectors

7 “Safety Evaluation” mode

7.1 “Safety Evaluation” mode functions

7.2 Selecting the operating mode

7.3 Selecting the service to be measured

7.3.1 Restricting the list of services to be measured using the first service

7.3.2 Restricting the list of services to be measured using the last service

7.3.3 Restoring the original list of services to be measured

7.4 Setting the measurement range

7.4.1 Setting the measurement range manually

7.4.2 Search for the best measurement range

7.4.3 Using noise suppression (Noise Threshold)

7.5 Selecting the result type

7.6 Selecting the averaging parameters

7.7 Selecting the resolution bandwidth (RBW)

7.8 Selecting display options

7.8.1 Selecting the units for the results

7.8.2 Selecting display options

8 “Spectrum Analysis” mode

8.1 Operating mode functions

8.2 Selecting the operating mode

8.3 Selecting the frequency range

8.3.1 Selecting the frequency range entry method

8.3.2 Defining the frequency range by upper and lower frequencies

8.3.3 Defining the frequency range by center frequency and frequency span