Welch Allyn RetinaVue 100 Imager Directions For Use Manual page 59

Directions for use
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 901103 is used exceeds the applicable RF
compliance level above, the 901103 should be observed to verify normal operation. If abnormal performance is observed,
additional measures may be necessary, such as reorienting or relocating the 901103.
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
equipment and the 901103
The 901103 is intended for use in an electromagnetic environment in which radiated RF disturbances are controlled. The
customer or user of the 901103 can help prevent electromagnetic interference by maintaining a minimum distance
between portable and mobile RF communications equipment (transmitters) and the 901103 as recommended below,
according to the maximum output power of the communications equipment.
Rated max. output
power of transmitter
(W)
0.01
0.1
1
10
100
For transmitters rated at a maximum output power not listed above, the recommended separation distanced 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.
Electromagnetic immunity
Separation distance according to frequency of transmitter (m)
150 kHz to 80 MHz 80 MHz to 800 MHz
d= (1.17) d= (1.17)
0.11667 0.11667
0.36894 0.36894
1.1667 1.1667
3.6894 3.6894
11.667 11.667
General compliance and standards 55
800 MHz to 2.5 GHz
d= (2.23)
0.23333
0.73785
2.3333
7.3785
23.3333