Page 49
Maintenance
6
User Guide
Troubleshooting
6.5
A
rt.
no.
: 0-4
8-02
40 Rev. c
FRED PA-1
6.5.3
Measures to prevent electromagnetic interferences
“Non-ionic electromagnetic radiation"
The user can help avoid electromagnetic disturbances by keeping the minimum dis-
tance between portable and mobile RF telecommunication devices (transmitters) and
the
FRED PA-1
®
. The distance depends on the output performance of the communi-
cation device as indicated below.
HF source
Transmitter fre-
quency
[MHz]
Power P
[W]
Distance d
[m]
Radio telephone (microcellular) CT1+, CT2, CT3
885-887
0.010
0.23
Cordless DECT telephone, WLAN, UMTS phone
1880-2500
0.25
1.17
Mobile phone USA
850/1900
0.6
1.8
Mobile phone
- GSM900,
- GSM850, NMT900, DCS 1800
900
850,900,1800
2
1
3.3
2.3
Walkie-talkie (rescue service, police, fire bri-
gade, service)
81-470
5
2.6
Mobile telephone system (rescue service, po-
lice, fire brigade)
81-470
100
11.7
RFID (active and passive transponders and
reading devices)
433
865-868
0.5
0.85
1.62
It can be deducted from the table that
portable
RF telecommunication devices must
not be used within a radius of 3 m from the device and its cables.
However, there is no guarantee that no interference can occur in certain instal-
lations. If the
FRED PA-1
®
causes interferences, these can be prevented by
switching off the device.
Further measures to prevent electromagnetic interferences:
The user can take the following measures to prevent electromagnetic interferences:
• Increase distance to the source of interference.
• Turn the device to change the angle of radiation.
• Only use original accessories (especially defibrillation electrodes)
• The device should not be used adjacent to or stacked with other equipment.
For more detailed information, please refer to page
55.