Electromagnetic Immunity - Welch Allyn CP 150 12 Manual

Directions for use

Electromagnetic immunity

The CP 150 electrocardiograph is intended for use in the electromagnetic environment
specified below. The customer or user of the CP 150 electrocardiograph should assure
that it is used in such an environment.
Immunity test
Conducted RF
IEC 61000-4-6
Radiated RF
IEC 61000-4-3
Note 1: At 80 MHz and 800 MHz, the higher frequency range applies.
Note 2: These guidelines may not apply in all situations. Electromagnetic propagation is
affected by absorption and reflection from structures, objects, and people.
a
Field strengths from fixed transmitters, such as base stations for radio (cellular/
cordless) telephones and land mobile radios, amateur radio, AM and FM radio broadcast
and TV broadcast cannot be predicted theoretically with accuracy. To assess the
electromagnetic environment due to fixed RF transmitters, an electromagnetic site
survey should be considered. If the measured field strength in the location in which the
CP 150 electrocardiograph is used exceeds the applicable RF compliance level above,
the electrocardiograph should be observed to verify normal operation. If abnormal
performance is observed, additional measures may be necessary, such as reorienting or
relocating the electrocardiograph.
b
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/
m.
IEC 60601 test level Compliance level
3 Vrms 3 Vrms
150 kHz to 80 MHz 150 kHz to 80 MHz
3 V/m 3 Vrms
80 MHz to 2.5 GHz 80 MHz to 2.5 GHz
EMC guidance and manufacturer's declarations 47
Electromagnetic environment -
guidance
Portable and mobile RF communications
equipment should be used no closer to any
part of the CP 150 electrocardiograph,
including cables, than the recommended
separation distance calculated from the
equation applicable to the frequency of the
transmitter.
Recommended separation distance
d = (1.2)
d = (1.2) 80 MHz to 800 MHz
d = (2.3) 800 MHz to 2.5 GHz
where P is the maximum output power
rating of the transmitter in watts (W)
according to the transmitter manufacturer
and d is the recommended separation
distance in metres (m).
Field strengths from fixed RF transmitters,
as determined by an electromagnetic site
a
survey, should be less than the
compliance level in each frequency range.
Interference may occur in the vicinity of
equipment marked with the following
symbol:
b