8
ELECTROMAGNETIC ENVIRONMENT GUIDANCE
INTERFERENCE IMMUNITY
Immunity test
IEC 60601‑1‑2
Test Level
Compliance
level
Electromagnetic
environment guidance
Conducted RF
IEC 61000‑4‑6
3 Vrms
150 kHz to
80 MHz
Not applicable
Portable and mobile RF
communications equipment
should be used no closer to any
part of the Model 9681, including
cables, than the recommended
separation distance calculated
from the equation applicable to the
frequency of the transmitter.
Recommended separation distance:
d = 1,2 √P 150 kHz to 80 MHz
d = 1.2 √ P 80 MHz to 800 MHz
d = 2.3 √ P 800 MHz to 2.7 GHz
where P is the maximum output
power rating of the transmitter
in watts (W) according to the
transmitter manufacturer and d
is the recommended separation
distance in meters (m).
Field strengths from fixed RF
transmitters, as determined by an
electromagnetic site survey,
a
should
be less than the compliance level in
each frequency range,
b
Interference may occur in the
vicinity of equipment marked with
the following symbol:
Radiated RF
IEC 61000‑4‑3
3 V/m
80 MHz to
2.7 GHz
3 V/m
80 MHz to 2.7 GHz
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 Model 9681 is used exceeds the applicable
RF compliance level above, the Model 9681 should be observed to verify normal operation. If
abnormal performance is observed, additional measures may be necessary, such as re‑orienting or
relocating the Model 9681.
