Document No.:
transmitter supplied by transmitter
manufacturer, in watt (W);
Recommended isolation distance, in
meter (m).
Field strength of fixed radio-frequency
transmitter shall be determined by
electromagnetic field survey, and it shall
be less than the compliance level in each
frequency range.
Interference may occur in the vicinity of
equipment marked with the following
symbols.
Note 1: At the frequency points of 80 MHz and 800 MHz, the formula of higher frequency band shall be
applied.
Note 2: These guidelines may not apply to all situations. Electromagnetic transmission is affected by
the absorption and reflection of buildings, objects and human bodies.
*Fixed transmitters, such as: base stations of wireless (cellular/cordless) telephone and ground mobile
radio, amateur radio, AM and FM radio broadcast and TV broadcast, their field strength cannot be
predicted theoretically and accurately. To assess the electromagnetic environment of fixed radio frequency
transmitter, the electromagnetic field survey shall be considered. If it is measured that the field strength of
the place where M4-HD bladder scanner locates is higher than the above RF compliance level, observe
M4-HD bladder scanner to verify that it can operate normally. If abnormal performance is observed,
additional measures may be necessary, such as readjustment of the direction or position of M4-HD bladder
scanner.
*In the frequency range of 150kHz to 80MHz, field strength shall be less than 3V/m.
Table 206
Recommended isolation distance between portable and mobile radio-frequency communication equipment
and M4-HD bladder scanner
M4-HD bladder scanner is expected to be used in electromagnetic environment where RF radiation
disturbance is controlled. According to the maximum output power of communication equipment, the
purchaser or user of M4-HD bladder scanner can prevent electromagnetic interference by maintaining the
minimum distance between the portable and mobile radio-frequency communication equipment
(transmitter) and M4-HD bladder scanner.
Maximum rated output
power of the transmitter
W
Isolation distances (m) corresponding to different frequencies of the transmitter
150KHz
～
80MHz
d=1.2
80MHz
～
800MHz
d=1.2
800MHz
～
2.5GHz
d=2.3
0.01
0.12
0.12
0.23
0.1
0.38
0.38
0.73
1
1.2
1.2
2.3
10
3.8
3.8
7.3
