H Sure Temp® Plus Service Manual
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 pre-
dicted theoretically with accuracy. To assess the electromagnetic environment due to fixed RF transmit-
ters, an electromagnetic site survey should be considered. If the measured field strength in the location in
which the device is used exceeds the applicable RF compliance level above, the device should be
observed to verify normal operation. If abnormal performance is observed, additional measures may be
necessary, such as reorienting or relocating the device.
b
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.
Recommended separation distances between portable and mobile RF communications equip-
ment and the Welch Allyn SureTemp Plus
The device is intended for use in an electromagnetic environment in which radiated RF disturbances are
controlled. The customer or user of the Welch Allyn thermometer can help prevent electromagnetic inter-
ference by maintaining a minimum distance between portable and mobile RF communications equipment
(transmitters) and the device as recommended below, according to the maximum output power of the
communications equipment.
Separation distance according to frequency of transmitter (m)
Rated maximum
output power of
transmitter (W)
150 kHz to 80 MHz
d = (1.17) P
80 MHz to 800 MHz
d = (1.17) P
800 MHz to 2.5 GHz
d = (2.33) P
0.01 0.11667 0.11667 0.23333
0.1 0.36894 0.36894 0.73785
1 1.1667 1.1667 2.3333
10 3.6894 3.6894 7.3785
100 11.667 11.667 23.3333
For transmitters rated at a maximum output power not listed above, the recommended separation dis-
tance d in meters (m) can be estimated using the equation applicable to the frequency of the transmitter,
where P is the maximum output power rating of the transmitter in watts (W) according to the transmitter
manufacturer.
Note 1: At 80 MHz and 800 MHz, the separation distance for 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.
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