Finding Recommended Separation Distances - Philips Avalon CTS M2720A Service Manual

10 Specifications

Finding Recommended Separation Distances

The device intentionally receives RF electromagnetic energy for the purpose of its operation. Therefore,
WARNING
other equipment may cause interference, even if that other equipment complies with CISPR emission
requirements.
In the following table, 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).
Portable and mobile RF communications equipment should be used no closer to any part of the device,
including cables, than the recommended separation distance calculated from the equation appropriate for
the frequency of the transmitter.
Field strengths from fixed RF transmitters, as determined by an electromagnetic site survey, should be less
than the compliance level in each frequency range.
Interference may occur in the vicinity of equipment marked with this symbol:
Table 2
Frequency Range
IEC 60601-1-2
(where Immunity
Test Level
Level is below IEC
over 150 kHz
60601-1-2 Test Level at
to 80 MHz
certain frequencies)
Note: The device meets the compliance level of 3.0 V
However, within the frequency ranges specified in this table, there are some frequencies at which the immunity level is below the IEC
60601-1-2 test level. Within each frequency range, the worst case immunity level is given. Over the frequency range 150 kHz to 80
MHz, the recommended separation distance in meters (d) is found by the following equation:
3 5 

-------- -
d =

V1
3.0 V 0.5 MHz - 1.6 MHz
Key:
d = Recommended separation distance in meters (m)
P = maximum output power rating of the transmitter in watts (W) according to the transmitter manufacturer
V1 = Tested compliance level (in Volts) for the Conducted RF Immunity test IEC 61000-4-6
92
Conducted RF Immunity Test
EN/IEC 61000-4-6
Known RF Sources
within Frequency
Range
according to IEC 60601-1-2 for most of the specified test frequency range.
RMS
 P
For a compliance level of 3.0 V

Medium Wave (AM)
radio stations
Electromagnetic Compatibility (EMC) Specifications
Environment Guidance:
Worst Case
Immunity Level Separation Distance (d)
within Frequency (in Meters, at Frequency
Range
for Ultrasound and ECG
:
RMS
0.1 V @ 1.003 MHz
Electromagnetic
Recommended
Range Tested)
Measurements

d = 1 2 P

d = 35 0 P