Graham Field GRAFCO 14423-8 - Manual (Page 38)

14423-INS-LAB-RevD11 38
Info 1: At 80 MHz and 800 MHz, the higher frequency range applies.
Info 2: These guidelines may not apply in all situations. Electromagnetic
propagation is affected by absorption and reflection from struc-
tures, objects and people.
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 theoreti-
cally with accuracy. To assess the electromagnetic environment due to
fixed RF transmitters, an electromagnetic site survey should be consid-
ered. If the measured field strength in the location in which the Grafco
Ultrasound Pocket Doppler is used exceeds the applicable RF compli-
ance level above, the Grafco Ultrasound Pocket Doppler should be ob-
served to verify normal operation. If abnormal performance is observed,
additional measures may be necessary, such as reorienting or relocating
the Grafco Ultrasound Pocket Doppler.
b: Over the frequency range 150 kHz to 80 MHz, field strengths should
be less than 3 V/m.
Recommended Separation Distances
Recommended separation distances between portable
and mobile RF communications equipment and the Grafco
Ultrasound Pocket Doppler
The Grafco Ultrasound Pocket Doppler is intended for use in an
electromagnetic environment in which radiated RF disturbances are
controlled. The customer or the user of the device can help prevent
electromagnetic interference by maintaining a minimum distance between
portable and mobile RF communications equipment (transmitters) and the
Grafco Ultrasound Pocket Doppler as recommended below, according to the
maximum output power of the communications equipment.
Rated
maximum
output power
of transmitter
(W)
Separation distance according to
frequency of transmitter (m)
80 MHz to 800 MHz 800 MHz to 2.5 GHz
0.01 0.1167 0.2334
0.1 0.3689 0.7378
1 1.1667 2.3334
10 3.6893 7.3786
100 11.6667 23.3334