Service manual

Ultraview 1030/1050 Monitors — Service Manual
B-4
Interference
RF fields pulsating at a sustained rate within the physiological pass band of this equipment may be
detected and then displayed as a valid waveform, or the fields may alter a valid waveform and
cause an erroneous parameter value.
Mitigation
Evaluate on site. Troubleshoot with patient simulators and then determine the source of the
interference. Separate the sensitive receivers from the causes of the interference (refer to the
following table).
* Field strengths from fixed transmitters, such as base stations for 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 monitors are used exceeds the applicable
RF compliance level above, the monitors should be observed to verify normal operation. If
abnormal performance is observed, additional measures may be necessary, such as reorienting
or relocating the monitors.
** Over the frequency range 150 kHz to 80 MHz, field strengths should be less than [ V
1
] V/m.
Recommended Separation Distances Between Portable and Mobile RF Communications
Equipment and the Monitor (always evaluate electronic equipment on site before use)
Rated Maximum
Output Power of
Transmitter
(watts)
Separation Distance According to
Frequency of Transmitter (meters)
150 kHz to 80 MHz 80 MHz to 800 MHz
800 MHz to
2.5 GHz
0.01 0.02 0.02 0.04
0.1 0.06 0.06 0.1
1 0.2 0.2 0.4
10 0.6 0.6 1.1
100 1.8 1.8 3.5
Note 1: At 80 MHz and 800 MHz, the separation distance for the higher frequency range
applies.
Note 2: These guidelines may not apply in all situations. Electromagnetic propagation is
affected by absorption and reflection from structures, objects, and people.