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SRM: WHEN SAFETY COUNTS

SRM-3006: SELECTIVE RADIATION METER

FOR ELECTROMAGNETIC FIELDS

UP TO 6 GHz

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Radio, TV, m obile phones, w ireless services: Electrom ag-

netic fields are the m edium w herever such form s of

com m unication are used. These fields affect everything

around them including the people that are m oving w it-

hin them . C om plete coverage w ould otherw ise be

im possible.

N ational and international authorities have fixed lim it

values for such fields to prevent harm ful effects. The

field strengths allow ed in the occupational environm ent

are usually higher than those for the general public,

because people w ho routinely w ork in electrom agnetic

fields are trained, aw are of the potential dangers, and

know w hat to do or have specific instructions w hich, for

exam ple, lim it exposure tim e to the field.

SAFETY?

AM FM DVB-T

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Legislators have laid the responsibility for ensuring

safety upon the operators of transm itting equipm ent

and the relevant authorities. These, in turn, can take

advantage of the m easurem ent services offered by

organizations and independent providers. There is real-

ly only one w ay to m ake sure everything is safe:

CHECK!

Photo reproduced by kind perm ission of

O RS sterreichische Rundfunksender G m bH & C o KG

A ustrian Broadcasting Services, w w w .ors.at

DAB TETRA GSM UMTS CDMA WIMAX

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W ideband m easuring equipm ent gives blanket covera-

ge of large frequency ranges, w hich could range from

the broadcast band to the m obile phone band and bey-

ond, for exam ple. W hen fitted w ith special probes, such

equipm ent can deliver results that are expressed auto-

m atically in term s of the applicable perm itted lim it valu-

es. These devices are usually easy to operate.

Selective devices such as spectrum analyzers break the

fields dow n into their individual frequency com ponents,

allow ing detailed analysis. They are m ore com plex to

operate and som e specialist know ledge is needed to

evaluate results.

The Selective Radiation M eter SRM -3006 from N arda

Safety Test Solutions com bines the analysis features of a

spectrum analyzer w ith the sim ple application of a

w ideband m easuring set. It w as developed specifically

to address safety concerns in electrom agnetic fields. In

contrast to a convertedspectrum analyzer, it provides

users w ith application-oriented operating m odes for

m easuring separate transm ission channels and services

such as analog or digital broadcasts (TV, DVB-T, D A B),

m obile phones (G SM , U M TS) or w ireless (W LAN ,

W iM A X). Results are displayed as individual values in

tables and as an overall total value, expressed in units of

field strength, pow er density, or sim ply as a percentage

of the perm itted lim it value. You dont need to be an

expert in spectrum analysis to use the SRM .

CHECK? HOW?


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The results can be show n in physical units, e.g. electric field strength

in V /m , m agnetic field strength in A /m , and pow er density in W /cm 2,

or directly as a percentage of the lim it values, for exam ple those

specified by IC NIRP. Im portant: The SRM can also subsequently

convert results to percentages, physical units or logarithm ic

quantities.

The Selective Radiation M eter and its

m easuring antennas are m atched.

A ny antenna and any instrum ent in the

range can be com bined to form a

handy unit. Plug and Play.

V/m A/m W/cm2

%

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Legally airtight, trustw orthy results depend on m any

factors: The m easuring equipm ent m ust be calibrated.

The m easurem ent m ust com ply w ith standards, and it

m ust be m ade professionally and correctly.

The SRM from N arda Safety Test Solutions is calibrated

traceable to national and international standards. It

fulfills all the requirem ents of current hum an safety

standards. A nd it m akes correct, professional m easure-

m ents easy, such as tim e-averaged m easurem ents over

the standard six-m inute period or spatial averaging over

several m easurem ent points. W hen using the isotropic

m easuring antennas for the SRM , you dont need to

w orry about the direction of the field either; the instru-

m ent doesnt m iss a thing. A nd you can set up and save

m easurem ent routines in advance, ensuring reproduci-

ble results and elim inating incorrect settings.

The SRM can create m easurem ent reports on-site, so

theres no possibility of transm ission errors creeping in.

The instrum ent includes the underlying standard in the

result, records the date, tim e and G PS coordinates, and

also saves w ritten or voice com m ents, w hich can descri-

be e.g. the am bient conditions or any events that occur

during the m easurem ent. A ll this m eans that you

alw ays get dependable results.

DEPENDABLE?


GPS TIME DATE VOICE

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Im possible to falsify: Screenshot of a Safety Evaluationresult.

The calibration certificate

records the traceability

of the calibration of the

instrum ent and antenna

to recognized standards

w ith accreditation if

requested.

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Electrom agnetic fields alw ays consist of an electrical

and a m agnetic field com ponent. Lim it values are there-

fore specified for both the electric as w ell as the m ag-

netic field strength.

The electric and m agnetic field strengths at a distance

from the source are in a fixed relationship, so it is suffi-

cient to m easure just one of the tw o com ponents. This

relationship does not apply close to the source, so both

com ponents m ust be determ ined separately.

The w avelength of the radiation determ ines the locati-

on of the near-field and the far-field. The near-field of a

long w ave transm itter extends for several kilom eters.

The near-field for m obile phone antennas ends w ithin

the space of about one m eter.

N arda Safety Test Solutions has developed a thoroughly

researched range of m easuring antennas. They m ake

the SRM into a universal m easuring set for electric and

m agnetic fields from long w ave up to the latest gene-

ration of m obile phone frequencies.

SRM WHAT FOR?

SRM: FOR EVERYTHING

Inside the isotropic electric

field m easuring antenna,

show ing three dipoles

arranged at m utual right

angles.

The isotropic (three-axis) m ea-

suring antenna for electric

fields (E-fields) up to 3 G Hz

is the all-round solution for

trouble-free m easurem ents

covering VSW to U M TS.

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Q uick and reliable because they are non-directional: The

isotropic antennas detect the field strengths in three

m utually perpendicular directions, and the SRM auto-

m atically calculates the resulting field strength. N ever-

theless, isotropic m easurem ents are also possible using

the single-axis antennas if you use a tripod and the

antenna holder, w hich allow s you to m ake successive

m easurem ents in three m utually perpendicular positi-

ons. The SRM supports this procedure by saving the

result for each of the three positions and then calcula-

ting the resulting field strength w ithout a PC .

A ll antennas and antenna cables are interchangeable

w ithout affecting accuracy: The calibration data for

each item is saved in the antenna or cable itself and is

read out and applied autom atically by the SRM Basic

U nit. A t the sam e tim e, the SRM blocks the frequency

ranges for w hich the antenna has not been calibrated.

This avoids incorrect m easurem ents.

ISOTROP SINGLE AXIS

ALL-PURPOSE MEASURING ANTENNAS

For rapid, non-directional

m easurem ents involving

latest generation w ireless

technologies: Three-axis

(isotropic) E-field antenna

for frequencies from800 MHz bis6 GHz


m easurem ents, e.g. cove-

ring m obile phone fre-

quencies: Three-axis (iso-

tropic) E-field antenna for

frequencies from27 MHz bis 3 GHz

For precision m easure-

m ents in the m obile

phone frequency range:

Single-axis E-field anten-

na for frequencies from27 MHz bis 3 GHz

For precision electric field

m easurem ents on radio /

TV transm itters and indus-

trial equipm ent: Single-

axis E-field antenna for

frequencies from9 kHz bis 300 MHz


m agnetic field m easure-

m ents in the near-field of

radio / TV transm itters

and industrial equipm ent:

Three-axis H-field antenna

for frequencies from

9 kHz bis 250 MHz

The single-axis antennas can be m ounted on a tripod and

adjusted to produce isotropic results by m aking m easure-

m ents in three m utually perpendicular positions. Hand-held,

they are also ideal for locating m axim um values w ithin aroom using the so-called pendulum m ethod.

The m easuring antennas can be connected to the SRM Basic

U nit directly or via a cable. An auxiliary control cable allow s

the Basic Unit to read out the m easuring antenna and

antenna cable data autom atically.

For precision m agnetic field m ea-

surem ents in the nearfield of

radio / TV transm itters and indus-

trial equipm ent: Single-axis H -field

antenna for frequencies from9 kHz bis 300 MHz

E-FIELD

H-FIELD

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Broadcasting, m obile telephony, industrial equipm ent:

W hat proportion of the overall field is from w hich sour-

ce? The answ er is of interest to the relevant authorities

and safety representatives as w ell as to the operators

them selves. There is often a need to know w hat field

strength is em anating from w hich equipm ent, w hich

channel or w hich radio cell. This determ ines w ho m ust

reduce output pow er in the event that the lim it values

are exceeded, for exam ple. O n the other hand, the

overall field strength is m ore im portant w hen it com es

to hum an safety and environm ental protection.

The Selective Radiation M eter SRM is perfect for such

investigations, thanks to its application-oriented opera-

ting m odes. For exam ple: Safety Evaluationw ith auto-

m atic evaluation of individual services such as analog

TV, digital radio (D VB-T, D A B), m obiles (G SM , U M TS),

and w ireless (W LAN , W iM A X), as w ell as a sum m ary of

the results in the form of an overall value. O r Level

Recorderm ode, w hich can even record pulsed radarsignals as num erical values. O r Scopem ode, w hich dis-

plays the variation of the field over tim e.

Even the resolution bandw idths are tailored to the

applications. U sing these settings, the SRM can select

out a single narrow G SM channel or capture an entire

broad D VB-T channel.

WHO? WHAT?

SRM FOR DETAILS

O verview w ith Safety Evaluation:

The services to be checked are recor-

ded in editable tables. Theres no

com plicated evaluation needed in

Safety Evaluationm ode: The num e-

rical result show s the individual con-

tributions of the services as w ell as

the overall level in term s of the per-

m itted lim it value.

C lassical spectrum analysis: Result

evaluation using m arkers and deltam arkers. The integration function can

be used to determ ine the channel

pow er level, for exam ple. Special

feature: Service identification by

m eans of pre-recorded service tables.

SPECTRUM ANALYS

LEVEL RECORDER SCOPE

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W hich channels are occupied? The

bar graph display in Safety Evaluati-

onm ode show s m axim um , average,

and m inim um values sim ultaneously,

so you can clearly see w hats going on.

U M TS P-C PIC H D em odulation: The

SRM autom atically identifies everyreceived UM TS cell by m eans of its

scram bling code and m easures the

field strength or pow er density of the

associated pilot channel (P-CPIC H) at

the sam e tim e. The SRM also show s

the sum of all P-CPIC H levels as an

overall value (Total). The analog m ea-

sured value for the frequency channel

is also show n for com parison. You

can also set a factor that the SRM

can use to extrapolate the field

strength that w ould result if all

channels w ere fully loaded.

View pulsed signals directly in Scope

m ode: The tim e dom ain display can

be set to cover a period of 24 hours

or can be m ore finely resolved, even

dow n to the m icrosecond level.

M easure pulsed signals easily in Level

Recorderm ode: The SRM com ple-m ents the num erical display of m axi-

m um and m inim um values w ith a bar

graph therm om eterdisplay: A m ar-

ker rem ains on the m axim um level in

each case.

SAFETY EVALUATION UMTS P-CPICH DEMODULATION

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It doesnt take long to m easure the actual field exposu-

re level. But how does the level change over a period of

seconds, m inutes, hours, or even days?

The SRM -3006 records individual radio channels in real

tim e w ith m icrosecond resolution in Scopem ode; this

capability is needed in order to capture radar im pulses.

O n the other hand, the instrum ent can also be used for

long-term m easurem ents, such as a Safety Evaluation.

The flow of data doesnt have to becom e a flood,

though. The start and sequence of m easurem ents can

be tim er controlled or triggered w hen a threshold is

crossed. The SRM then sum m arizes the data sets in a

clear display.

Particularly convenient: The SRM determ ines the instan-

taneous, average, m axim um , and m inim um values at

the sam e tim e.

The SRM can operate independently for about three

hours on fully charged batteries. The batteries can easi-

ly be replaced on-site, so theres no need to hunt for the

nearest pow er outlet.

KEEP CHECKING

SRM FOR LONG-TERM MONITORING

Long term m onitoring in the w orkplace: Even the W LAN connecti-

on to a laptop and the in-house w ireless telephones contribute

to the field exposure level. The SRM can be operated for hours

or days on end using an A C adapter.

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Safety Evaluationin a residential area:

Is it really only the m obile phone base

stations that are the source of the field?

Practical, on-site battery exchange: W ith a spare

set of batteries, you can run the equipm ent for

a w hole day w ithout needing A C line pow er.

ACT AVG MAX MIN MAX AVG MIN AVG

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There is a different field situation at each different m ea-

surem ent location. H ow ever, the m easurem ents them -

selves are repeated. N arda Safety Test Solutions has

equipped the SRM -3006 w ith program m able m easure-

m ent routines for this reason. The SRM runs through

specific setups in succession and perform s the necessa-

ry tasks. This saves tim e, avoids incorrect m easure-

m ents, and m eans that the results from different locati-

ons are com parable and reproducible.

The SRM can do a lot of things autom atically if you

w ant it to, such as setting a suitable m easurem ent

range and selecting the appropriate resolution band-

w idth. You can also easily perform m easurem ent steps

m anually, such as sw itching from the FM radio range to

the D VB-T range or from G SM -900 to G SM -1800.

EVERYDAY CHECKS

Prepare

M easure

Evaluate

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Sw itching betw een operating m odes also includes

som e clever features. For exam ple, if you determ ine the

center frequency of a U M TS frequency channel using

spectrum analysis, the SRM w ill continue m easuring at

exactly that frequency w hen you sw itch to U M TS P-

C PIC H D em odulation, Scope, or Level Recorder

m ode.

M eaningful m easurem ent involves a process, w hich

begins w ith configuring the instrum ent and ends w ith

the evaluation, docum entation, and m anagem ent of

the m easured data. The SRM -3006 TS PC softw are lets

you do all this easily.

You can also com bine instrum ent setups into m easure-

m ent routines and upload them to the SRM using the

PC softw are. C onversely, you can dow nload the results

from the SRM , evaluate, record, and discuss them w it-

hout any tim e-consum ing further processing on a PC .

ROUTINE WITH SRM

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A single spectrum captured using the SRM contains

thousands of m easurem ent points. D uring the course of

a norm al w orking day, the SRM m ay store m any such

spectra along w ith other results. W hich data is im por-

tant, w hat inform ation is relevant for assessing safety?

You dont need to be a spectrum analysis specialist to

use the SRM . N evertheless, experts can set all the para-

m eters for spectrum analysis individually and evaluate

the details m anually. For exam ple, you can zoom in on

individual lines in the spectrum , com pare spectral com -

ponents using the delta m arker, or read off the m axim a

and m inim a at a specific frequency. You can also select

a video bandw idth to sm ooth the trace, just as w ith a

laboratory spectrum analyzer. The original resolution is

still retained in the background.

Selective m easurem ent in the tim e dom ain is unique:

Pulsed signals can be displayed directly in Scopem ode

w ith tim e intervals ranging from hours right dow n to

m icroseconds. In Level Recorderm ode, the SRM -3006

displays the instantaneous peak and RM S values as w ell

INSIGHT

D etailed evaluation of a Spect-

rum A nalysisin the 1800 M H zm obile phone range (G SM -

1800): U sing the D elta m arker,

spectral com ponents can be

com pared or the m axim a and

m inim a at a specific frequency

can be read out.

Safety Evaluationw ith bar

graph display: Professional users

can im m ediately see the diffe-rence betw een traffic channels

(TC H ) and control channels

(BCC H ) w hen the m axim um ,

average, and m inim um values

are displayed sim ultaneously.

Pulsed fields in Scopem ode:

A s w ith an oscilloscope, you

can m easure im pulse lengths

and period durations. And you

can also set triggers: M easure

once w hen the threshold is

exceeded, or each tim e the

threshold is exceeded or by

tim er control.

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as the m axim um peak and RM S values that occurred

during the m easurem ent. W ith a resolution bandw idth

extending up to 32 M H z, the SRM -3006 is also fully

equipped to handle the next generation of m obile com -

m unications system s.

Expert users dont need to put up w ith inconvenience,

either. The SRM autom atically generates a list, even

from the m ost detailed spectrum . This Peak Tablegives

access to im portant details.

OVERVIEW

Keep it sim ple: Evaluation of a

Spectrum A nalysisusing the

Peak Table. The list of the hig-

hest field strengths and their

corresponding frequencies, ser-

vice nam es and even the nam es

of the service providers if these

have been recorded in service

tables is particularly convenient.Item s in the table can be sorted

according to various criteria.

Safety Evaluationin the U M TS

range: The individual channels

w ith their channel num bers are

show n next to each other in the

bar graph display, just like a

textbook. The Tbar on the

extrem e right show s the total

pow er density. The Obar

show s the contributions from

the frequency gaps (others) bet-w een the services.

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H andy enough for on-site w ork but w ith high-end spe-

cifications suitable for laboratory use the SRM offers

both.

The Basic U nit has a footprint w hich is about the sam e

size as this brochure. Together w ith the m easuring

antenna, it form s a unit that can easily be carried up any

tow er. The com bination is ergonom ically designed,

m echanically robust, and splash proof. The casing is

electrically resistant to field strengths of up to 200 V/m .

This m eans that you can still m easure the field strength

in areas w here m ost other instrum ents have long cea-

sed to function. M any of its features show their real

w orth in difficult environm ents: the voice recorder for

spoken com m ents, the rough textured rear panel ensu-

ring you have a good grip, and the large area keypad

that can still be operated even if you are w earing glo-

ves.

N evertheless, the specifications of the SRM -3006 are

such that it can double as a laboratory instrum ent: A n

unusually high m axim um bandw idth of 32 M H z, a sig-

nal to noise ratio that is excellent for a hand-held devi-

ce, and the standard N connector that can be used to

connect cables and antennas from other m anufactu-

rers.

ON-SITE OR LAB?

ON-SITE AND LAB

Everything on hand: M easuring w orkplace safety using the SRM Basic Unit and m easuring antenna.

Photo reproduced by kind perm ission of O RS

sterreichische Rundfunksender G m bH & C o K G

A ustrian Broadcasting Services, w w w .ors.at

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1 10 100 1k 10k 100k 1M 10M 100M 1G 10G 100G

10

100

1k

10k

100k

0,1f [Hz]

[V/m]

occupational

general publicThe advantage of a specialized

device: If required, the SRM

evaluates directly according to

safety standards. Show n here:

IC N IRP occupational and gene-

ral public lim it value curves.

Ergonom ics for the lab: The SRM can

be set at a tilt so it is easy to operate

and read.

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VERSIONS AND FUNCTIONS

The Selective Radiation M eter SRM -3006 is available

packaged in various sets of equipm ent; for exam ple:

Basic U nit w ith isotropic (three-axis) E-field m easuring

antenna up to 6 G H z or Basic U nit w ith isotropic

(three-axis) E-field m easuring antennas up to 3 G H z and

6 G H z. Each set also includes the SRM -3006 Tools PC

softw are, U SB cable, A C adapter / charger, w rist strap

and carry strap. The equipm ent is fitted in a choice of

either a soft case or a rigid shell case.

A ll these com ponents as w ell as other equipm ent can

be supplied as accessories.

Please refer to the latest data sheet at w w w .srm 3006.com

for detailed specifications.

SAFETY EVALUATION

SPECTRUM ANALYSISFor a rapid overview of

thefield exposure level

as a graph, a table, or

a total valueFor analyzing the field exposure level

in detail, as a graph or table,w ith display of individual values

and calculation of the exposure

due to entire frequency ranges

LEVEL RECORDER

UMTS (OPTION)

SCOPE (OPTION)

GENERAL FUNCTIONS

For a rapid overview of

tim e-variable fields, w ith

num erical display of

peak and RM S

values

Pilot channel (P-CPIC H )

dem odulation and extrapolation

to the m axim um possible

field exposure level

For detailed real tim erecording and

evaluation of

tim e-variable fields

Tim e or event controlled recording

U ser-defined configuration

Im portation of calibration data

M easurem ent routines, setups

Spatial averaging

Voice recorder

G PS

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ACCESSORIES

OPTIONAL ACCESSORIES

A ntennas

Three-axis E-field antenna up to 6 G H z

Three-axis E-field antenna up to 3 G H z

Three-axis H -field antenna up to 250 M H z

Single-axis E-field antenna up to 3 G H z

Single-axis E-field antenna up to 300 M H z

Single-axis H-field antenna up to 300 M H z

A ntenna cables

RF cable, 1.5 m

RF cable, 5 m

Tripod

Tripod adapter for single- and three-axis antennas

Tripod adapter for three-axis antennas

Transport

Soft case or rigid shell case

Shoulder bag

Carry strap

Pow er supply

Spare batteries

Battery charging station

Softw are

SRM -3006 TS PC softw are w ith com prehensive data

m anagem ent features

C are Packages w ith extended w arranty and calibration


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LOW FREQUENCY MEASUREMENT

M easuring devices for electric and m agnetic fields from D C up to severalhundred kilohertz. For pow er utilities, electric railroads, and industry. Stan-

dard-com pliant evaluations, e.g. according to the Dom estic Appliance

standard IEC 62233.

WIDEBAND HIGH FREQUENCY MEASUREMENT

NBM -500: The instrum ent range that covers practically every applicationbetw een 100 kHz and 60 GH z.

N arda Safety Test Solutions is a global leader in the

developm ent and production of m easuring equipm ent

for electric, m agnetic, and electrom agnetic fields. This is

borne out by our ow ning som e 95% of all the publis-

hed patents for m easuring such fields. N arda instru-

m ents are the products of a highly innovative com pany

that specializes in EM F m easurem ents for safety in

electrom agnetic fields and w hich is continually expan-

ding its position in this sector.

O ur three facilities are located at H auppauge, Long

Island / U SA , Pfullingen / G erm any and C isano / Italy. It

is our aim to provide all our custom ers w ith tailor-m ade,

high-tech products of the highest quality.

NARDA: WHEN SAFETY COUNTS

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SELECTIVE HIGH FREQUENCY MEASUREMENT

SRM -3006: The instrum ent that selectively identifies andm easures every source in the frequency range from 9 kH z

to 6 G H z w ith a sensitivity that can detect individual tele-

com m unications channels even w ithin a building.

PERSONAL MONITORS

W orn or carried on the person,these devices give reliable w ar-

ning of excessive radiation levels.

AREA MONITORING STATIONS

For perm anent m onitoring of the field strengthsituation. Frequency selective or w ideband. D ata

transm ission via m obile phone link.

The com prehensive product portfolio for hum an safety

in electrom agnetic fields (EM F) includes w ideband and

frequency-selective m easuring devices, m onitoring sta-

tions and personal m onitors. U nder the PM M brand, w e

offer instrum ents for assessing the electrom agnetic

com patibility (EM C ) of devices. O ur range of custom er

services also includes servicing, calibration, and training.

OUR COMPLETE RANGE

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Narda Safety Test Solutions Srl

Via Leonardo da V inci, 21/23

20090 Segrate (M ilano), Italy

Phone: +39 02 2699871

Fax: +39 02 26998700

E-m ail: support@ narda-sts.it

w w w .narda-sts.it

N arda Safety Test Solutions 2009

The nam e and logo are registered trade-

k f N d S f T S l i G bH

Narda Safety Test Solutions GmbH

Sandw iesenstrasse 7

72793 Pfullingen, G erm any

Phone: +49 (0) 7121-97 32-777Fax: +49 (0) 7121-97 32-790

E-m ail: support@ narda-sts.de

w w w .narda-sts.de

Narda Safety Test Solutions

435 M oreland Road

H auppauge, N Y 11788, U SA

Phone: +1 631 231-1700

Fax: +1 631 231-1711

E-m ail: N ardaSTS@ L-3C O M .com

w w w .narda-sts.us

Srm 3006

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