Recommended Safety Distances Between Rf Devices And The Device - Valley Electronics Lady-Comp Instructions Manual

Recommended safety distances between portable and mobile RF devices
and the Lady-Comp ® device
The Lady-Comp devices are intended for use in the electromagnetic environment specified below. The
customer or the user of the Lady-Comp device can prevent electromagnetic interference by maintaining
a minimum distance between portable and mobile RF devices (transmitters) and the Lady-Comp
depending on the output of the other RF device, such as specified below.
"W"-rating Minimum distance depends on transmission frequency "M"
transmitters
150 kHz to 80 MHz, 80 MHz to 800 MHz,
d = 1.2√P d = 0.35√P
0.01 0.12 0.04
0.1 0.38 0.11
1 1.20 0.35
10 3.79 1.11
100 12.00 3.50
For transmitters not specified in the above table, the distance can be determined using the equation
based on the transmitter, where P is the power rating of the transmitter in watts (W) according to the
transmitter manufacturer.
Comment 1
For calculating the recommended minimum dis­
tance of transmitters in the frequency range from
80MHz to 2.5 GHz, an additional factor of 10/3
800 MHz to 2.5 GHz,
was used to reduce the likelihood that a mobile/
d = 0.7√P
portable RF device inadvertently brought into
patient areas could result in a malfunction.
0.07
0.22
Comment 2
0.70
2.21
These guidelines may not apply in all cases.
7.00
Electromagnetic propagation is affected by ab­
sorption and reflection from structures, objects,
and people.
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Guidelines and manufacturer's declaration on electromagnetic immunity
The Lady-Comp devices are intended for use in the electromagnetic environment specified below.
The customer or the user of the Lady-Comp device should ensure that it is used in such an environment.
Immunity test IEC 60601-standard Level of compliance
Static discharge ± 6 kV contact discharge ± 6 kV contact discharge
Electrostatic discharge (indirect) ± 8 kV air discharge
(ESD) per ± 8 kV air discharge
IEC 61000­4­2
Electrical fast transient/ ± 2 kV for power supply ± 2 kV for power supply
burst immunity test per lines lines
IEC 61000­4­4 ± 1 kV for input and ± 1 kV for input and
output lines => not output lines => not
applicable applicable
Surge voltages per IEC ± 1 kV ± 1 kV
61000­4­5 Differential mode Differential mode
(symmetrical) (symmetrical)
Voltage dips, short < 5% UT for ½ period < 5% UT for ½ period
interruptions, and (> 95% onset) (> 95% onset)
voltage variations per 40% UT for 5 periods 40% UT for 5 periods
IEC 61000­4­11 (60% onset) (60 % onset)
70% UT for 25 periods 70% UT for 25 periods
(30 % onset) (30% onset)
< 5% UT for 5 s. < 5% UT for 5 s.
(> 95 % onset) (> 95 % onset)
Electromagnetic environment – guidelines
Floors should be wood, concrete, or ceramic tile. If floors are
covered with synthetic material, the relative humidity should be
at least 30%.
The device is powered by batteries and/or accumulators.
The device is powered by batteries and/or accumulators.
The device is powered by batteries and/or accumulators.
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