Types of LISN
Com-Power LISN series is explained below,
LISN 100, 1100, and 1X series (these include LI-1100C, LI-125C, LI-150C, LI-120C, LI-3P-1X)
50μH inductor
Used for FCC, CISPR, EN
Frequency 150 kHz – 30 MHz
LISN 200, and 2X series (these include LI-220C and LI-3P-2X)
50 and 250 μH inductor
Used for FCC, CISPR, EN
Frequency 9 kHz – 30 MHz
LISN 300 and 3100 series (these include LI-325C, LI-350, LI-3100)
5 μH inductor
Used for DO-160, Mil-std 461, CISPR 25
Frequency 10kHz – 400 MHz
LISN 400, 4100, and 4X series (these include LI-400C, LI-4100, and LI-3P-4X)
50 μH inductor
Used for DO-160, Mil-std 461
Frequency 10kHz – 10 MHz
LISN 500 series (this include LI-550C)
5 μH inductor
Used for CISPR 25 only
Frequency 100 kHz to 108 MHz
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What is a LISN (Line Impedance Stabilization Network)?
The line impedance stabilization network (LISN) is a measuring device that is used in electromagnetic compatibility (EMC) testing for the purpose of monitoring radio frequency (RF) signal levels across a specified frequency spectrum, while simultaneously maintaining a consistent impedance value.
The LISN circuit is designed and constructed to meet the performance criteria given by CISPR, FCC, ISO, EN, RTCA DO-160 and MIL-STD 461D.
A LISN, or as it is also known, Artificial Mains Network (AMN), as a function of its design, performs the following functions:
- Provides a defined, stable, impedance to the Equipment Under Test (EUT) Isolates the EUT from the power distribution network (or power source); thereby minimizing the potential effects of external influences on the measurements, and facilitating accurate and repeatable results.
- Provides a near 1:1 (<0.5 dB insertion loss) 50O coaxial measurement port (type-N) for connection to a spectrum analyzer or EMI receiver.
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 Com-Power.
Com-Power carries a variety of Three-Phase LISNs for CISPR 16-1-2/ANSI C63.4 of current ratings from 16 to 100 Amps. The line under test can be selected using a manual/mechanical switch or a fiber optic controlled remote interface. All Com-Power LISNs are individually calibrated in compliance with the relevant standards. Impedance, Phase, Isolation, and Insertion Loss data is supplied with each unit, along with the calibration certificate.
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