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Conducted RF IEC 
61000-4-6

Radiated RF IEC 
61000-4-3

3 Vrms
150 kHz to 80 MHz
3 V/m
80 MHz to 2.5 GHz

3 Vrms

3 V/m

PortableandmobileRFcommunications

equipment should be used no closer to 

any part of RI Witness™, including cables, 

than the recommended separation

distance calculated from the equation

applicable to the frequency of the 

transmitter.
Recommendedseparationdistance
d = [3.5/V 

1

]√p

d = [3.5/V

1

]√p

d = [3.5/V

1

√p

where  p is the maximum output

power rating of the transmitter in

watts (W) according to the transmitter

manufacturer and d is the recommended 

separationdistanceinmetres(m).Field

strengths from fixed RF transmitters,

as determined by an electromagnetic

site survey, 

a 

should be less than the 

compliance level in each frequency 

range.

b

 Interference may occur in the 

vicinity of equipment marked with the 

following symbol: 

Note 1: At 80 MHz and 800 MHz, the higher frequency range applies.
Note 2:Theseguidelinesmaynotapplyinallsituations.Electromagneticpropagationisaffectedby
absorptionandreflectionfromstructures,objectsandpeople.
Note 3:Theseguidelinesmaynotapplyinallsituations.Electromagneticpropagationisaffectedby
absorptionandreflectionfromstructures,objectsandpeople.

a

Fieldstrengthsfromfixedtransmitters,suchasbasestationsforradio(cellular/cordless)telephones

and land mobile radios, amateur radio, AM and FM radio broadcast and TV broadcast cannot be predicted 
theoreticallywithaccuracy.ToassesstheelectromagneticenvironmentduetofixedRFtransmitters,
anelectromagneticsitesurveyshouldbeconsidered.Ifthemeasuredfieldstrengthinthelocationin
whichRIWitness™isusedexceedstheapplicableRFcompliancelevelabove,RIWitness™shouldbe
observedtoverifynormaloperation.Ifabnormalperformanceisobserved,additionalmeasuresmay
benecessary,suchasre-orientingorrelocatingRIWitness™.

b

Overthefrequencyrange150kHzto80MHz,fieldstrengthsshouldbelessthan[V]V/m.