23
Guidance and manufacturer statement - Electromagnetic Immunity
The device is intended for use in the electromagnetic environment specified below. The customer or the user
of the device shouId assure that is used in such an environment.
Immunity test
IEC 60601 test level
Compliance Level
Electromagnetic environment - guide
Portable and mobile RF communications
equipment should be used no closer to
any part of apex locator, including
cables,
than
the
recommended
separation distance calculated from the
equation applicable to the frequency of
the transmitter.
Recommended separation distance
Conducted RF
GB/T17626.6
3V(Effective value)
150kHz~80MHz
3V(Effective value) d=1.2
√𝑝
Radiated RF
GB/T17626.3
3V/m
80MHz~2.5GHz
3V/m
d=1.2
√𝑝
80MHz~800 MHz
d=2.3
√𝑝
800 MHz~2.5GHz
P——Where P is the maxi mum output
power rating of the transmitter in watts
(W) according to the transmitter
manufacturer;
d——d is the recommended separation
distance in meters (m)
Field
strengths
from
fixed
RF
transmitters as determined by an
electromagnetic site survey, shouId be
less than the compliance level in each
frequency range.
NOTE: U
T
is the ac. mains voltage prior to application of the test level.
NOTE 1: At 80 MHz and 800 MHz, the higher frequency range applies.
NOTE 2: These guidelines may not apply in at I situations. Electromagnetic propagation is affected by
absorption and reflection from structures objects and people.
a) Field strengths from fixed transmitters, such as base stations for radio (celIular/ cord less) 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
device is used exceeds the applicable RF compliance level above, the device should be observed to verify
normal operation. If abnormal performance is observed, additional measures may be necessary, such as
re-orienting or relocating the device.
b)Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.
