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EMC guidance and manufacturer's declarations
Recommended separation distances between portable
and mobile RF communications equipment and the CP 50
electrocardiograph
The CP 50 electrocardiograph is intended for use in an electromagnetic environment in which radiated RF disturbances
are controlled. The customer or user of the CP 50 electrocardiograph can help prevent electromagnetic interference by
maintaining a minimum distance between portable and mobile RF communications equipment (transmitters) and the
CP 50 electrocardiograph as recommended below, according to the maximum output power of the communications
equipment.
Rated max. output
power of transmitter
For transmitters rated at a maximum output power not listed above, the recommended separation distance d in meters (m) can be
estimated using the equation applicable to the frequency of the transmitter, where P is the maximum output power rating of the
transmitter in watts (W) according to the transmitter manufacturer.
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.
Separation distance according to frequency of transmitter (m)
150 kHz to 80 MHz
(W)
d = (1.17)
0.01
0.117
0.1
0.37
1
1.17
10
3.70
100
11.70
Welch Allyn CP 50 resting electrocardiograph
80 MHz to 800 MHz
d = (1.17)
P
P
0.117
0.37
1.17
3.70
11.70
800 MHz to 2.5 GHz
d = (2.33)
P
0.233
0.74
2.33
7.37
23.30
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