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INSTRUCTION MANUAL
LI-550C
LINE IMPEDANCE STABILIZATION NETWORK
19121 El T oro R d ● S il vera d o, Ca lifo rnia 926 76 ● (94 9) 459 - 9600 ● com - p ower.com
REV021317
5.0
P
RODUCT
D
ESCRIPTION
5.1 Overview
The LI-550C Line Impedance Stabilization Network is specifically designed to
provide necessary measurement platform for performing power line conducted
emissions (disturbance measurements) compliance testing as required for CISPR,
CE and other worldwide standards for commercial products. It is fully compliant
with the requirements of both CISPR 16-1-2 and CISPR 25.
The LI-550C performs each of the following functions during the measurement:
•
provides a defined, stable impedance throughout the measurement
frequency range;
•
isolates the EUT and measurement circuit from the power source, thereby
minimizing its influence on the measurements; and,
•
couples the disturbance voltages to the coaxial measurement port for
connection to the measuring instrument like EMI Receiver or Spectrum
Analyzer.
5.2 Product Setup
Before initiating use of LISN, ensure that,
•
PE conductor is connected to ground.
•
The ventilation openings are unobstructed.
• N
o signal or operating voltages above the permissible limits given in
specification.
• The LISN’s power input port is
connected to an appropriate power source
employing properly rated mains protection, as over current protection is
not provided in the LISN.
Failure to comply with any of these points may damage the equipment and/or
pose an electrical hazard.
5.2.1 Typical connection diagrams
The LISNs can be used with single phase power sources with one set of
LISNs and also three phase power sources (requires two sets of LISNs). Given
below are the typical connection setup’s for each configuration.
Figure 1: Single Phase connection with one set of LISN
