Service manual

Brentwood Medical Technology Corp. IQmark Digital Spirometer
Addendum – EMC Requirements Instructions for Use
Addendum to 3-100-1025 Revision 8.0
Page 5 of 4
Table 4 – Recommended separation distances between portable and mobile RF communications
and the IQmark Digital Spirometer
Recommended separation distances between Portable and mobile RF communications
equipment and the IQmark Digital Spirometer
The IQmark Digital Spirometer is intended for use in an electromagnetic environment in which radiated RF
disturbances are controlled. The customer or the user of the IQmark Digital Spirometer can help prevent
electromagnetic interference by maintaining a minimum distance between portable and mobile RF
communications equipment (transmitters) and the IQmark Digital Spirometer as recommended below,
according to the maximum output power of the communications equipment.
Separation distance according to frequency of transmitter
m
Rated maximum
output power of
transmitter
W
150 kHz to 80 MHz
d = 1.2 √ P
80 MHz to 800 MHz
d = 1.2 √ P
800 MHz to 2.5 GHz
d = 2.3 √ P
0.01 0.12 0.12 0.23
0.1 0.38 0.38 0.73
1 1.2 1.2 2.3
10 3.8 3.8 7.3
100 12 12 23
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 to 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.
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