Messtechnik U16/14-100k, Руководство пользователя

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U16/14-100k Date:
11/19/13
Manual Page 5
3 Field of application
•
Transmission of analog signals during EMC-tests
•
Transmission of analog signals over long distances without voltage
loss (up to 100m or more, depending on timing requirements)
•
Handle ground potential problems
An external filter has to be used for high level EMC-tests. The filter has to
be attached directly to the input of the transceiver located in the absorber
lined chamber. Depending on the range of use (ESD, BCI, …) there may be
different filters available. Please contact us to get the best solution.
4 External filters
An external filter mounted to the device inside the anechoic chamber has
to be used for all emissions and immunity tests. With this, a damage of the
device is avoided during immunity tests (=> obligatory! no internal filter
existing) and the emissions spectrum is reduced during emissions testing.
Filters and voltage dividers have to be connected directly to the device
since they are matched to its input-impedance (do not use an extension!).
Notice the differentiation of input- and output filters (see chapter4.1).
4.1 Differentiation: input vs. output filter
If you want to transmit analog voltages from outside into the anechoic
chamber, output filters are needed (the external filter has to be mounted
to the device inside the anechoic chamber)! This has to be mentioned
while ordering the equipment, because input filters are the standard (used
to transmit signals out of the chamber). Notice that input filters cannot
simply be mounted to the receiver (output), because of different
impedances. Incorrect measurements would be the result!
•
Transmission from inside to the outside of the anechoic chamber:
input filter (mounted to transmitter), Standard
•
Transmission from outside to the inside of the anechoic chamber:
output filter (mounted to receiver )
The use of an
external filter for
high level EMI-tests
is essential.
If disregarded, the
system might get
damaged!
Respect the
application purpose
while choosing the
external filter!
Input- and output
filters are not
interchangeable
Distributed by: Reliant EMC LLC, 3311 Lewis Ave, Signal Hill CA 90755, 408­916­5750, www.reliantemc.com