Handy Tech
Elektronik GmbH
Modular Evolution
Appendix
Page 40
70 % U
T
(30 % dip in U
T
)
For 25 cycles
< 5 % U
T
(>95 % dip in U
T
)
for 5 s
70 % U
T
(30 % dip in U
T
)
For 25 cycles
< 5 % U
T
(>95 % dip in U
T
)
for 5 s
it is recommended that the
Braille display be powered
from an uninterruptible
power supply or a battery.
Power frequency
(50/60 Hz) magnetic
field
IEC 61000-4-8
3 A/m
0,3 A/m
If image distortion occurs,
it may be necessary to
position the Braille display
further from sources of
power frequency magnetic
fields or to install magnetic
shielding. The power
frequency magnetic field
should be measured in the
intended installation
location to assure that it is
sufficiently low.
NOTE: U
T
is the a.c. mains voltage prior to application of the test level.
Guidance and manufacturer's declaration
– electromagnetic
immunity
Guidance and manufacturer's declaration
– electromagnetic immunity
The Braille display is intended for use in the electromagnetic environment specified below. The
customer or the user of the Braille display should assure that it is used In such an environment.
Immunity test
IEC 60601 test
level
Compliance
level
Electromagnetic environment -
guidance
Portable and mobile RF communications
equipment should be used no closer to
any part of the Braille display, including
cables, than the recommended
separation distance calculated from the
equation applicable to the frequency of
the transmitter.
Recommended separation distance
Conducted RF
IEC 61000-4-6
3 Vrms
150 kHz to 80 MHz
3 Vrms
d = 1,2
√P
Radiated RF
IEC 61000-4-3
3 V/m
80 MHz to 2,5 GHz
3 V/m
d = 1,2
√P
80 MHz to 800 MHz
d = 2,3
√P
800 MHz to 2,5 GHz
Where P is the maximum output power
rating of the transmitter in watts (W)
according to the transmitter
manufacturer and d is the recommended
separation distance in metres (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:
