Level 1®
CONVECTIVE WARMER
| Operator’s Manual
34
S E C T I O N 8 • S p e c i f i c a t i o n s
Electromagnetic Environmental Recommendations
Recommended separation distances between portable and mobile RF communications equipment and the Level 1®
Convective Warmer
The convective warmer is intended for use in an electromagnetic environment in which radiated RF disturbances
are controlled. The customer or the user of the convective warmer can help prevent electromagnetic interference
by maintaining a minimum distance between portable and mobile RF communications equipment (transmitters)
and the convective warmer as recommended below, according to the maximum output power of the
communications equipment.
Rated maximum
output power of
transmitter
W
Separation distance according to frequency of transmitter (m)
150 kHz to 80 MHz d = [3.5/V1]√P
80 MHz to 800 MHz d = [3.5/E1]√P
800 MHz to 2.5 GHz
d = [7/E1]√P
0.01
0.12
0.12
0.24
0.1
0.37
0.37
0.74
1
1.16
1.16
2.33
10
3.69
3.69
7.38
100
11.66
11.66
23.33
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 power (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: The ISM (industrial, scientific, and medical) bands between 150 kHz and 80 MHz are 6.765 MHz to 6.795 MHz;
13.553 MHz to 13.567 MHz; 26.957 MHz to 27.283 MHz; and 40.66 MHz to 40.70 MHz.
Note 3: An additional factor of 10/3 is used in calculating the recommended separation distance for transmitters in
the ISM frequency bands between 150 kHz and 80 MHz and in the frequency range 80 MHz to 2.5 GHz to decrease the
likelihood that mobile/portable communications equipment could cause interference if it is inadvertently brought
into patient areas.
Note 4: These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and
reflection from structures, objects and people.