Nellcor Oximax NPB-40 Operator's Manual page 150

Specifications
Table 12: Electromagnetic Immunity
Interference may occur in the vicinity of equipment marked with
this symbol.
Note 1: At 80 MHz, 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.
a
Field strength 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 which the NPB-40 is used exceeds the applicable
RF compliance level above, the NPB-40 should be observed to verify normal
operation. If abnormal performance is observed, additional measures may be
necessary, such as reorienting or relocating the NPB-40.
b
Over the frequency range 150 kHz to 80 MHz, field strength should be less
than [V } V/m.
1
142