Com-Power LI-325 User Manual
Features, Typical connection diagrams, Description
Line Impedance Stabilization Network
LI-325
Features
Frequency range of 10 kHz to 400 MHz
Fully compliant with DO-160/ MIL-STD 461
“Air-core” inductors to prevent saturation
Individual Calibration Included
Three-Year Warranty
The LI-325 Line Impedance Stabilization Network
(LISN) provides the necessary measurement
platform for performing power line conducted
emissions compliance testing as required by most
worldwide standards for commercial products.
The LI-325 is compliant with both RTCA DO-160 and
MIL-STD 461.
The LISN provides defined stable impedance and
isolates the EUT from power source influences,
thereby providing accurate and repeatable results.
The LI-325 includes one pair of, separately housed,
single-conductor networks, to be installed in series
with each current-carrying conductor in a single-
phase, dual-phase or DC power system. A second
LI-325 pair can be used to accommodate 3-phase
power systems (Wye or Delta configurations).
The LI-325 is equipped with Superior Electric
SUPERCON® shrouded sockets at the mains
(power input) and EUT (power output) ports. The
matching color-coded plugs for connection to the
mains and EUT wiring are included.
This LISN uses air-core inductors to prevent
saturation and permeability variation. The
mounting plate of the LI-325 is left unpainted in
order to facilitate connection to earth ground in its
installation, which is essential due to high leakage
current.
All Com-Power LISNs are individually calibrated
in compliance with the relevant requirements of
RTCA DO-160 and MIL-STD 461. Impedance and
Insertion Loss data is supplied with each unit,
along with the calibration certificate.
Com-Power Corporation
19121 El Toro Rd., Silverado, California 92676
(949) 459 - 9600
Typical Connection Diagrams
Single Phase connection with one set of LISN
Three Phase connection with two sets of LISNs
LINE
NEUTRAL
LINE
NEUTRAL
EQUIPMENT
UNDER
TEST
POWER
SOURCE
EARTH GROUND
LISN
LISN
GROUND
GROUND
GROUND
GROUND
LINE 3
NEUTRAL
LINE 3
NEUTRAL
EQUIPMENT
UNDER
TEST
POWER
SOURCE
EARTH GROUND
LISN
LISN
GROUND
GROUND
GROUND
GROUND
LINE 1
LINE 2
LINE 1
LINE 2
LISN
LISN
GROUND
GROUND
GROUND
GROUND
Description
Rev. D04.14