Welch Allyn 690 Directions For Use Manual page 26

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The Welch Allyn SureTemp Plus models 690 and 692 is intended for use in the electromagnetic environment
specified below. The customer or user of the Welch Allyn thermometer should assure that it is used in such an
environment.
Immunity Test IEC 60601
Test Level
Conducted RF 3 Vrms
IEC 61000-4-6 150 kHz to 80 MHz
Radiated RF 3 V/m
IEC 61000-4-3 80 MHz to 2.5 GHz
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 Welch Allyn SureTemp Plus is used
exceeds the applicable RF compliance level above, the Welch Allyn SureTemp Plus should be observed to verify
normal operation. If abnormal performance is observed, additional measures may be necessary, such as reorienting
or relocating the Welch Allyn SureTemp Plus.
b
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.
Electromagnetic Immunity
Compliance Electromagnetic Environment - Guidance
Level
Portable and mobile RF communications equipment should be
used no closer to any part of the Welch Allyn SureTemp Plus
models 690 and 692, including cables, than the recommended
separation distance calculated from the equation applicable to
the frequency of the transmitter.
Recommended separation distance
3 Vrms d = (1.17)
P
3 V/m d = (1.17) P
d = (2.33) 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 separation distance in metres (m).
Field strengths from fixed RF transmitters, as determined by
an electromagnetic site survey,
compliance level in each frequency range.
Interference may occur in the vicinity of equipment marked
with the following symbol:
Welch Allyn SureTemp Plus
80 MHz to 800 MHz
800 MHz to 2.5 GHz
a
should be less than the
b