Com-Power LI-325 User Manual
Line Impedance Stabilization Network
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
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
Description
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.
LI-325
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 certicate.
Typical Connection Diagrams
The LISN provides dened stable impedance and
isolates the EUT from power source inuences,
Single Phase connection with one set of LISN
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 congurations).
The LI-325 is equipped with Superior Electric
SUPERCON® shrouded sockets at the mains
Three Phase connection with two sets of LISNs
(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.
Com-Power Corporation 19121 El Toro Rd., Silverado, California 92676 (949) 459 - 9600 www.com-power.com
Rev. D04.14
Line Impedance Stabilization Network
LI-325
Application
Product Name Line Impedance Stabilization Network (LISN)
Specication CISPR 16-1-2 / ANSI C63.4
Application
Frequency Range
RF Connector
Current Rating
Voltage Rating
Inductors
Mains & EUT Connections
Dimensions (each network)
Power line conducted emissions tests
10 kHz to 400 MHz
50Ω N-type (female)
25 Amperes
270 VAC (Line to Ground), 380 VDC
50 µH (air-core)
Superior Electric SUPERCON® shrouded sockets
13 x 7.5 x 8 inches / 33 x 19 x 20 cm
Weight (each network) 5 lbs. / 2.2 kg
Insertion Loss
All specications are subject to change without notice.
All values are typical, unless specied.
100
10
< 0.3 dB (150 kHz to 30 MHz)
, 17 Amperes
(AC)
(DC)
LISN Model No. LI-325
Mains Port: 10 uF to
Ground
1
Impedance (ohm)
0.1
0.01 0.1 1 10 100 1000
70
60
50
40
30
Impedance (ohm)
20
10
0
0.1 1 10 100
Com-Power Corporation 19121 El Toro Rd., Silverado, California 92676 (949) 459 - 9600 www.com-power.com
Frequency (MHz)
Frequency (MHz)
RTCA DO-160F, Figure 201 (5 uH) Impedance Limits
LISN Model No. LI-325
Mains Port: Open
MIL-STD 461F, Fig A.3
(5uH) Impedance Limits
(±20%)
Rev. D04.14
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