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LISN (line impedance stabilization network) is used to provide an impedance to the power input of the EUT (equipment under test). This is an essential tool for when operators need to stabilize power lines so they can perform conducted emissions measurements. There are three main functions of LISNs, as a way to divert unwanted signals from a power source, an RF noise measurement port, and resistance of an electric circuit or component to an alternating current (impedance).

During a test setup, a LISN is connected to a power source that is conducted to the EUT. For the consistency of conducted emissions testing, the standard of line impedance is set to 50 µH. The LISN also serves as a filter for RF noise to preserve the quality of EMC measurements. An EMI receiver or spectrum analyzer is able to measure these RF emissions. To provide known impedance and an RF measurement port, a LISN is placed between an AC or DC power source and the EUT.

It is important to understand the frequency, current type, and voltage the test standard requires when choosing the right LISN. For DC power you will need a single-phase DC LISN and for AC power sources you will need a three-phase AC LISN.

Avalon carries a variety of LISNs from top manufacturers (Com-PowerTeseq, and R&S) to meet your testing requirements. Rent or purchase from Avalon Test Equipment and Test With Confidence®.

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Com-Power LI-150C LISN

150 kHz–30 MHz

Com-Power LI-325 LISN

10 kHz–400 MHz, 5 microhenry / 25 Amps

Com-Power LI-400C LISN

10 kHz–10 MHz, 50 microhenry / 25 Amps

Com-Power LI-4100 LISN

10 kHz–10 MHz, 50 microhenry / 100 Amps

Com-Power LI-550A LISN

100 kHz–108 MHz, 5 microhenry / 50 Amps

Com-Power LI-550C LISN

100 kHz–08 MHz

Com-Power LI-125C LISN

150 kHz–30 MHz

Com-Power LI-125A LISN

150 kHz to 30 MHz, 50 microhenry / 25 Amps

Com-Power LI-150A LISN

150 kHz–30 MHz, 50 microhenry/50 Amps

Com-Power LI-3100 Line LISN

10 kHz– 400 MHz, 5 microhenry / 100 Amps

Com-Power LI-350 LISN

10 kHz–400 MHz, 5 microhenry / 50 Amps

Com-Power LIN-120A LISN

150 kHz to 30 MHz, CISPR 16-1-2 / ANSI C63.4, 50 microhenry / 20 Amps

Com-Power LI-1100C LISN

150 kHz–30 MHz

Com-Power LI-325C LISN

LISN 25 Amps for DO-160 & MIL-STD 461

COM-POWER LI-125 LISN

150kHz-30MHz, 2 lines, 25A, 270/280VAC

Teseq ISN T2A Impedance Stabilization Network

Impedance stabilization networks (ISN, or with CISPR 16-1-2 called AAN: asymmetric artificial network) are defined for measuring of conducted common mode disturbances at information technology equipment (ITE) as required in CISPR 22 and CISPR 32. The ISN is placed between the equipment under test (EUT) and auxiliary equipment (AE) or load which are necessary for the operation of the EUT.

Teseq ISN PLT Impedance Stabilization Network

For Power Line Telecommunication (PLT) 1.6 to 30 MHz

Teseq ISN PLT-A Impedance Stabilization Network

For Power Line Telecommunication (PLT)

Com-Power ISN-T8

Impedance Stabilization Network for 8 lines

Com-Power LI-3P-2x Series LISN

9 kHz–30 MHz, 50/250 uH, 500 VAC

Com-Power LI-220A LISN

For ISPR 16-1-2/ANSI C63.4, 9 kHz - 30 MHz.