MWA-M / MWA-PM-BA-e-1614
17
Guidelines and manufacturer’s declaration - electromagnetic noise immunity
The multi-function balances MWA are intended for operation in the kind of electromagnetic
environment stated below. The customer or user of the multi-function balances MWA should ensure
that they are operated in this kind of environment.
Noise immunity
tests
IEC 60601 test level
Conformity
Electromagnetic environment -
guideline
Conducted HF
disturbance
variables
acc. to IEC 61000-4-
6
3
150 kHz to 80 MHz
3 V
Do not use portable or mobile radio
sets nearer to the multi-function
balances MWA or their wires than the
distance recommended as safety
distance which is calculated according
to the equation relevant for its
transmission frequency.
Recommended safety distance:
for 80 MHz to 800 MHz
for 800 MHz up to 2.5 GHz
Use P as rated capacity of radio
transmitter in Watt (W) as per details
given by the radio transmitter
manufacturer and d as recommended
safety distance in metres (m).
The field intensity of stationary radio
transmitters should for all frequencies
be lower according to an in situ
a
examination than the conformity level.
b
Interference may occur near devices
bearing the symbol below.
Emitted HF
disturbance
variables
Acc. to IEC 61000-4-
3
3
80 MHz to 2.5 GHz
3 V/m
NOTE 1
Higher frequency range applies to 80 MHz and 800 MHz.
NOTE 2
These guidelines may not be applicable in all cases.
The spread of electromagnetic variables is influenced by absorption and
reflections in buildings, objects and humans.
a
The field intensity of stationary radio transmitters such as base stations of wireless telephones and
mobile radio sets, amateur radio stations, AM and FM radio and television stations cannot be
reliably predicted in advance. To determine the electromagnetic environment in respect of
stationary transmitters, you should consider a study of electromagnetic phenomena at the location.
If the measured field intensity at the location where the balance is to be used exceeds the
conformity level above, you should observe the multifunctional balances MWA in order to ensure
normal operation. If you observe unusual features of performance you may have to take additional
measures such as a change in alignment or a different location for the multifunctional balances
MWA.
b
For a frequency range of 150 kHz to 80 MHz field intensity should be less than 3 V/m.