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INSTRUCTION MANUAL
LI-3P-1x Series
3-PHASE LINE IMPEDANCE STABILIZATION NETWORKS (LISNs)
SECTI ON 4 -
PRODUCT APPLICATION
1912 1 E l T o ro R d
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Si l vera do, Ca lifo rni a 9 26 76
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(9 49) 459 -96 00
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co m-p o wer. com
REV083017
4.3 Test Equipment Setup and Connections
Illustrated in Figure 5 below is an example of a typical test setup for conducted
emissions testing for an LI-3P-1x Series LISN.
FIGURE 5 -
Example Test Equipment Setup/Connections
Depending on the electromagnetic environment, the use of a shielded
enclosure, power line filters and/or isolation transformers may or may not be
necessary. The LISN will act as a filter, providing greater than 40 dB of isolation
between the Mains Port and EUT Port. However, this may not be sufficient for
some installations, and additional power line filtration may prove to be necessary.
The standard CISPR 16-1-2 requires the use of a 10 dB attenuation pad between
the LISN measurement port and the measuring instrument in order to assure
accurate termination. The VSWR of the input and output port of the attenuation
pad shall be less than or equal to 1.2:1. Com-Power Transient Limiters incorporate
two 5 dB attenuation pads; thereby satisfying the 10 dB requirement. The
transient limiters comply with the 1.2:1 VSWR requirement, as well.
Using a transient limiter will also protect the RF input of your EMI receiver or
spectrum analyzer, which are extremely sensitive, and easily damaged by high
voltage transients. In addition, Com-Power Transient Limiters also incorporate
both a low pass and high pass filter to further attenuate out of band signals,
thereby reducing the possibility of RF overload.
Transient Limiters and 10 dB attenuation pads are available from Com-Power.
