User's Manual

Recommended Distance Between the Device and Portable/Mobile RF Equipment
The device can be used in electromagnetic environment where RF interference is controlled. To avoid
electromagnetic interference, users are advised to keep distance between the device and portable/mobile
RF communication equipment. Following recommended distance is calculated in accordance with
maximum output power of communication equipment.
Emitter’s Rated Max
Output Power (W)
Isolation Distance (m) Based on Emitter’s Frequency
150kHz~2MHz
d=1.2√P
80MHz~800MHz
d=1.2√P
800 MHz~2.5GHz
d=2.3√P
0.01 0.12 0.12 0.23
0.1 0.37 0.37 0.74
1 1.17 1.17 2.34
10 3.69 3.69 7.38
100 11.67 11.67 23.34
If the rated output power is not included in above figure, the isolation distance can be reckoned with
corresponding formula. P in formulate is emitter’s rated output power provided by manufacturer (Unit:
W).
Note 1: Adopt high frequency formula when frequency is 80MHz~800 MHz
Note 2: Above guidelines do not apply to all situations, because material structure, object and crowd can
absorb and reflect electromagnetic waves, and hence affect electromagnetic propagation.
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