Welch Allyn Connex ProBP 3400 digital blood pressure device - User Manual - Manual (Page 65)

Electromagnetic immunity
whereP is the maximum output power
rating of the transmitter in watts (W) andd
is the recommended separation distance
in meters (m). Field strengths from fixed RF
transmitters, as determined by an
electromagnetic site survey a , should be
less than the compliance level in each
frequency range b . Interference may occur
in the vicinity of equipment marked with
the following symbol:
Note1: At 80 MHz and 800 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 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
device is used exceeds the applicable RF compliance level above, the device should be observed to verify
normal operation. If abnormal performance is observed, additional measures may be necessary, such as
reorienting or relocating the device.
b Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.
Recommended separation distances between portable and mobile RF
communications equipment and the device
The device is intended for use in an electromagnetic environment in which radiated RF disturbances are
controlled. The customer or user of the device can help prevent electromagnetic interference by maintaining
a minimum distance between portable and mobile RF communications equipment (transmitters) and the
device as recommended below, according to the maximum output power of the communications equipment.
Separation distance according to frequency of transmitter (m)
Rated max.
output power of
transmitter (W)
150 kHz to 80
MHz
d= (1.17)
80 MHz to 800
MHz
d= (1.17)
800 MHz to 2.5 GHz
d= (2.23)
0.01 0.11667 0.11667 0.23333
0.1 0.36894 0.36894 0.73785
1 1.1667 1.1667 2.3333
10 3.6894 3.6894 7.3785
100 11.667 11.667 23.3333
For transmitters rated at a maximum output power not listed above, the recommended separation distanced
in meters (m) can be estimated using the equation applicable to the frequency of the transmitter, whereP is
the maximum output power rating of the transmitter in watts (W) according to the transmitter manufacturer.
Directions for use Guidance and manufacturer's declaration 59