www.balluff.com
Handheld Programmer
BIS U-870
7
Note
The International Commission of Radiological Protection (ICRP) has specified limit
values for the exposure of humans to RF fields. These limit values are also recommen-
ded by the ICNIRP (International Commission of Non Ionizing Radiological Protection).
Acc. to IEC 62369 „Evaluation of human exposure to electromagnetic fields from short
range devices (SRDS) in various applications over the frequency range 0 GHz to 300
GHz“, the following limit values apply for UHF systems in the frequency range
860-930 MHz:
Electric field strength: E = 41.25 V/m
–
Magnetic field strength: H = 0.111 A/m
–
RF power density: E x H = 4.57 W/m
–
2
For the maximum permissible radiated power acc. to ETSI, the safety distance should
be maintained. This means that persons should not remain closer than 26 cm to the
transmitter antenna for longer periods of time (several hours without interruption). Brief
periods near the antenna (distance < 0.26 m), even if repeated, pose no cause for
concern according to current knowledge. Reducing the transmission power also
reduces the required safety distance. With this device, a transmission power of 0.5 W
is possible and the minimum safety distance that is to be maintained is d = 0.13 m.
Note
To avoid negatively impacting the transmission power, please make certain that there
are no objects between the Handheld Programmer and the data carrier.
2.5 Safety distance
between
transmitter
antenna and
persons
2.6 Impairment of
transmission
power
Safety
2
