User's Manual

Guidance and Manufacturer’s Declaration Electromagnetic Immunity
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 StimRouter system is used exceeds the applicable RF
compliance level above, the StimRouter system should be observed to verify normal operation. If
abnormal performance is observed, additional measures may be necessary, such as reorienting
or relocating the StimRouter system.
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 StimRouter System
The StimRouter system is intended for use in an electromagnetic environment in which radiated
RF disturbances are controlled. The customer or the user of the StimRouter system can help
prevent electromagnetic interference by maintaining a minimum distance between portable and
mobile RF communications equipment (transmitters) and the StimRouter system as recommended
below, according to the maximum output power of the communications equipment.
d = 1.2√P
d = 0.4√P
d = 2.3√P
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.
Chapter 13 - Appendix - EMI Tables
91
Rated Maximum
Output Power of
Transmitter
W
Separation Distance According to Frequency of Transmitter
150 kHz to 80 MHz 80 MHz to 800 MHz 800 MHz to 2.5 GHz
0.01
4.7 in. (0.12 m)
1.6 in (0.04 m)
9.1 in. (0.23 m)
0.1
15 in. (0.38 m)
4.7 in. (0.12 m)
2 ft 5 in. (0.73 m)
1
3 ft 11 in. (1.2 m)
15.7 in. (0.4 m)
7 ft 7 in. (2.3 m)
10
12 ft 6 in. (3.8 m)
4 ft 2 in. (1.26 m)
24 ft 11 in. (7.3 m)
100
39 ft 4 in. (12 m)
13 ft 1 in. (4 m)
75 ft 6 in. (23 m)