User's Manual

Specifications
62 Specifications and Regulatory
These EMC standards describe tests for both emitted and received interference.
Emission tests deal with interference generated by the device itself, whereas
Immunity tests deal with determining electromagnetic compatibility of the device
while used in the presence of surrounding electronic equipment or other external
sources that may generate interference.
Warning Radio frequency (RF) interference from nearby transmitting devices may
degrade performance of Philips Telemonitoring Set devices. Electromagnetic
compatibility with surrounding devices should be assessed prior to using this
equipment.
Philips Telemonitoring Set devices should not be used next to or stacked with
other equipment. If you must stack the device, check that normal operation is
possible.
Emissions and
Immunity
The EMC standards state that manufacturers of patient-coupled equipment must
specify immunity levels for their devices when there is reduced performance.
During the EN 61000-4-3 Radiated Immunity test, some reduced performance was
observed.
EN 61000-4-3 specifies that devices be subjected to a field of 3 Volts/meter over a
frequency range of 26 to 1000 MHz with no degradation of performance or loss of
function below the performance level specified when equipment is operated as
intended. Radio communication from the Philips Telemonitoring Set devices may
occasionally be interrupted when subjected to frequencies in the 800 MHz - 942
MHz range at field strength levels as low as 0.05 V/m. The phenomena discussed
above are not unique to this unit but are characteristic of radio instrumentation in
use today. The M3812B TeleStation is a radio receiver and its reception of Philips
Telemonitoring Set device signals can be degraded by electromagnetic
interference.
Avoiding
Electro-
magnetic
Interference
The Philips Telemonitoring System is intended for use in an electromagnetic
environment in which radiated RF disturbances are controlled. The customer or the
user of the Philips Telemonitoring System can help prevent electromagnetic
interference by maintaining a minimum distance between portable and mobile RF
communications equipment (transmitters) and the Philips Telemonitoring System
as recommended below, according to maximum output power of the
communications equipment.
The M3812B TeleStation contain a sensitive radio receiver that is intended to
receive radio signals from the measurement devices and can be degraded by
electromagnetic energy in the frequency range of 870 MHz to 960 MHz. Avoid the
use of any radio frequency device operating in this frequency range when using the
Philips Telemonitoring System. Possible sources of interfering radio frequency
radiation are cellular telephones, cordless telephones, and other products that
contain radio transmitters. The following table gives safe distances to keep radio
frequency transmitters away from your Philips Telemonitoring Set devices.