Com-Power LI-550A 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 100 kHz to 108 MHz
Fully compliant with CISPR 25 / CISPR 16-1-2
“Air-core” inductors to prevent saturation
Individual Calibration Included
Three-Year Warranty
Description
The LI-550A 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-550A is compliant with both CISPR 25 and
CISPR 16-1-2 .
The LISN provides dened stable impedance and
isolates the EUT from power source inuences,
thereby providing accurate and repeatable results.
LI-550A
Use of a Transient Limiter for impedance matching,
reduction of out-of-band emissions and transient
protection for your measurement instrument is
highly recommended and available from ComPower.
All Com-Power LISNs are individually calibrated
in compliance with the relevant requirements
of CISPR 25 and CISPR 16-1-2. Impedance, Phase,
Isolation, and Insertion Loss data is supplied with
each unit, along with the calibration certicate.
Typical Connection Diagrams
The LI-550A includes one pair of, separately housed,
Single Phase connection with one set of LISN
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-550A pair can be used to accommodate 3-phase
power systems (Wye or Delta congurations).
The LI-550A is equipped with Superior Electric
SUPERCON® shrouded sockets at the mains
(power input) and EUT (power output) ports. The
Three Phase connection with two sets of LISNs
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-550A 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-550A
Application
Product Name Line Impedance Stabilization Network (LISN)
Specication CISPR 25 / CISPR 16-1-2
Application
Frequency Range
RF Connector
Current Rating
Voltage Rating
Inductors
Mains & EUT Connections
Dimensions (each network)
Power line conducted emissions tests
100 kHz to 108 MHz
50Ω N-type (female)
50 Amperes
270 VAC (Line to Ground), 380 VDC
50 µH (air-core)
Superior Electric SUPERCON® shrouded sockets
13 x 7 x 7 inches / 33 x 17.7 x 17.7 cm
Weight (each network) 14 lbs. / 6.3 kg
Insertion Loss
Isolation
All specications are subject to change without notice.
All values are typical, unless specied.
70
60
50
< 1.5 dB (150 kHz to 30 MHz)
> 20 - 40 dB (100 kHz to 3 MHz)
> 40 dB ( 3 MHz to 30 MHz)
, 35 Amperes
(AC)
(DC)
LISN Model No. LI-550A
40
30
Impedance (ohm)
20
10
0
0.1 1 10 100 1000
100
90
80
70
60
50
40
30
20
10
Phase Angle (degree)
0
-10
-20
0.1 1 10 100 1000
Com-Power Corporation 19121 El Toro Rd., Silverado, California 92676 (949) 459 - 9600 www.com-power.com
Frequency (MHz)
Frequency (MHz)
CISPR 16-1-2, Ed.1.2, Tbl 5
(5uH) Impedance Limits
(±20%)
LISN Model No. LI-550A
CISPR 16-1-2, Ed.1.2, Tbl 5
(5uH) Phase Limits
(±11.5°)
Rev. D04.14
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