H-1.601. 00137-B3.0
Page 74 of 81
For frequency of 80MHz and 800MHz, a formula in respect of high
frequency should be used.
Note 2：
As EM transmission is affected by absorption and reflection of buildings,
objects and human bodies, these guidelines may not be applicable to all
circumstances.
a) ISM bands between 150kHz and 80MHz are 6.765MHz~6.795MHz,
13.553MHz~13.567MHz, 26.957MHz~27.283MHz and
40.66MHz~40.70MHz.
b) ISM bands between 150kHz and 80MHz and compliance levels between
80MHz and 2.5GHz are used to reduce the possibility of interference
resulted from mobile/portable communication devices which are
accidentally taken into patient's location. For this reason, additional
factor 10/3 is used for calculation of recommended distance to the
transmitter within these frequency ranges.
c) Theoretically, field strength of fixed transmitters, such as wireless
(cellular/cordless) phone and mobile ground radio base station, amateur
radio, FA/FM radio broadcast and TV broadcast, cannot be estimated
accurately. Evaluation of EMI environment of fixed radio frequency
transmitter should take into consideration survey at EM locations. If field
strength measured at the place where T5 Emergency Ventilator is
located is higher than the aforesaid applicable radio frequency
compliance level, then T5 Emergency Ventilator shall be observed to
verify its normal operation. If any abnormal property is found, related
remedial measure may be required, such as re-adjustment of orientation
or position of T5 Emergency Ventilator.
d) Throughout the frequency range of 150kHz~80MHz, the field strength
should be lower than 3V/m.
12.4
Recommended isolation distance
Recommended distance between portable and mobile RF
communication equipment and T5 Emergency Ventilator
T5 Emergency Ventilator is intended for use in RFI-controlled EMI
environments. Based on the maximum rated power of related
communication equipment, purchaser or user can prevent EMI by
maintaining the minimum distance between portable and mobile RF
communication equipment and T5 Emergency Ventilator as recommended
below.
Distance (m) for Transmitters of Various Frequencies
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