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Recommended separation distances between portable and mobile RF communications
equipment and the Welch Allyn CareTemp™ Touch Free Thermometer
The Welch Allyn CareTemp™ Touch Free Thermometer is intended for use in an electromagnetic environment in which
radiated RF disturbances are controlled. The customer or user of the Welch Allyn CareTemp™ Touch Free Thermometer
can help prevent electromagnetic interference by maintaining a minimum distance between portable and mobile RF
communications equipment (transmitters) and the Welch Allyn CareTemp™ Touch Free Thermometer as recommended
below, according to the maximum output power of the communications equipment.
Separation distance according to frequency of transmitter (m)
Rated max. output
power of transmitter
(W)
150 kHz to 80 MHz
d= 1.2
150 kHz to 80 MHz
d= 2
80 MHz to 800 MHz
d= 1.2
800 MHz to 2.7 GHz
d= 2.3
0.01 0.12 0.2 0.12 0.23
0.1 0.38 0.632 0.38 0.73
1 1.20 2 1.20 2.30
10 3.8 6.32 3.8 7.3
100 12 20 12 23
For transmitters rated at a maximum output power not listed above, the recommended separation distance
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.
Test specifications for enclosure port immunity to RF wireless communications equipment
Test frequency
(MHz)
Band
a
MHz
Service
a
Modulation
b
Maximum power
(W)
Distance (m) Immunity
test level (V/
m)
385 380 - 390 TETRA 400
Pulse modulation
b
18 Hz
1.8 0.3 27
450 430 - 470 GMRS 460,
FRS 460
FM
c
±5 kHz
deviation
1 kHz sine
2 0.3 28
710 704 - 787 LTE band 13, 17
Pulse modulation
b
217 Hz
0.2 0.3 9
745
780
810 800 - 960 GSM 800/900,
TETRA 800,
iDEN 820,
CDMA 850,
Pulse modulation
b
18 Hz
2 0.3 28
870
22 Guidance and manufacturer's declaration CareTemp™ Touch Free Thermometer
26


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  • the thermometer will not take a temperature, it shows ERR on the screen, it is only 8 months old. Submitted on 15-4-2021 at 14:55

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