Frequency Separation Distances - Spacelabs 90217 Service Manual

90207 Ambulatory Blood Pressure Monitor Service Manual

Frequency Separation Distances

Note:
The ABP monitor is intended for use in an electromagnetic environment in which
radiated RF disturbances are controlled. The customer, or user, of the module can
help prevent electromagnetic interference by maintaining a minimum distance
between portable and mobile RF communications equipment (transmitters) and the
module, as recommended below, according to the maximum output power of the
communications equipment.
Recommended Separation Distances Between Portable and Mobile RF Communications
Equipment and the Monitor (Always evaluate electronic equipment on site before use.)
Immunity IEC 60601
Test Test Level
Radiated RF 3 V/m
IEC 61000-4-3 80 MHz to
2.5 GHz
* 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
Compliance
Level
3 V/m Portable and mobile RF communications equipment
1 kHz sine should be used no closer to any part of the monitor,
80% AM including cables, than the recommended separation
distance calculated from the equation applicable to the
frequency of the transmitter.
Recommended separation distance:
Where 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).
Field strengths from fixed RF transmitters, as
determined by an electromagnetic site survey,* should
be less than the compliance level in each frequency
range.**
Electromagnetic Environment
3.5
[ ]
P
d =
V
1
150 kHz to 80 MHz
3.5
[ ]
P
d =
E
1
80 MHz to 800 MHz
7
[ ]
P
d =
E
1
800 MHz to 2.5 GHz
Interference may occur in the vicinity of
equipment marked with the following symbol.
IEC 60417-5140: Non-ionizing
electromagnetic radiation
] V/m.
1
A-2