Philips Avalon CTS M2720A, Service Manual, Page: 99 / 110

Electromagnetic Compatibility (EMC) Specifications 10 Specifications
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Field strengths from fixed transmitters, such as base stations or radio (cellular, cordless) 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, it should be observed to verify normal
operation. If abnormal performance is observed, additional measures may be necessary, such as reorienting
or relocating the device.
These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and
reflection from structures, objects, and people.
If you require further information or assistance, please contact Philips Support.
Table 3
Radiated RF Immunity Test
EN/IEC 61000-4-3
IEC 60601-1-2
Test Level
over 80 MHz to
2.5 GHz
Frequency Range (where
Immunity Level is below
IEC 60601-1-2 Test Level
at certain frequencies)
Known RF Sources
within Frequency
Range
Worst Case Immunity
Level within
Frequency Range
Electromagnetic
Environment Guidance:
Recommended Separation
Distance ( d )
(in Meters, at Frequency
Range Tested)
for Ultrasound and ECG
Measurements
Note: The device meets the compliance level of 3.0 V/m according to IEC 60601-1-2 for most of the specified test frequency range. 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 800 MHz to 2.5 GHz, the recommended separation distance in meters ( d ) is found by the following equation:
Over the frequency range 800 MHz to 2.5 GHz, the recommended separation distance in meters ( d ) is found by the following equation:
3.0 V 270 MHz - 320 MHz Commercial radio
service (for example,
aircraft radio) 1.1 V @ 277.499 MHz
3.0 V 890 MHz - 960 MHz Commercial radio
service (for example,
GSM cell phones,
WLAN) 0.1 V @ 925.010 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
E 1 = Tested compliance level (in Volts/meter) for the Radiated RF Immunity test IEC 61000-4-3
d
3 0

E 1
---------
 
 
P =
For a compliance level of 3.0 V/m:
d 1 2 P

=
d
7 0

E 1
---------
 
 
P =
For a compliance level of 3.0 V/m:
d 2 3 P

=
d 3 2 P

=
d 70 0 P

=