MedSource MS-131002 - Separation Distances

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 aected 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 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.
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Recommended Separation Distances between
Portable and Mobile RF Communications Equipment and the Non-Contact Infrared Thermometer
The Non-Contact Infrared Thermometer is intended for use in an electromagnetic environment in which
radiated RF disturbances are controlled. The customer or user of the device can help prevent
electromagnetic interference by maintaining 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.
Rated Maximum Output
Power of Transmitter (W)
Separation distance according to frequency of transmitter (m)
150 kHz – 80 MHz
d = 1.2√p
80 MHz – 800 MHz
d = 1.2√p
800 MHz – 2.5 GHz
d = 2.3√p
0.01
0.1
1
10
100
0.12
0.38
1.2
3.8
12
0.12
0.38
1.2
3.8
12
0.23
0.73
2.3
7.3
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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 applies.
Note 2: These guidelines may not apply in all situations. Electromagnetic propagation is aected by the absorption and
reflection from structures, objects and people.