LISN (Line Impedance Stabilisation Networks)

Line Impedance Stabilisation Network

A LISN, which is an abbreviation of 'Line Impedance Stabilisation Network', is a device that is used in conducted and radiated radio-frequency emission and susceptibility tests, as specified in various EMC / EMI test standards.

LISNs are used to test conducted and radiated radio-frequency emissions and susceptibilities by acting as a low-pass filter usually placed between an AC or DC power supply and the equipment being tested. 

Different types of LISNs can be used to measure DC, single phase or 3-phase AC power supplies. 

A LISN used for mains powered equipment may also be called an Artificial Mains Network (AMN).

A LISN provides a repeatable, stable electrical enviroment by providing a defined impedance to the Equipment Under Test (EUT) while also providing filtering to prevent any noise present in the power source affecting the EUT and protecting the supply from noise generated within the EUT. Additionally, the LISN contains a 50 Ω RF measurement port. All of this allows conducted RF meaurements to be made in a controlled manner.

Most EMC standards require the use of a 50 Ω LISN with either 5 µH or 50 µH characteristic impedance.

Selecting the correct LISN for the required application is based on the following parameters:

  • voltage rating
  • current rating
  • impedance
  • insertion loss
  • number of power conductors
  • connector types

Browse our range of LISN equipment below.

For more information on any of our LISN devices, please contact us or give us a call on +44 (0) 1462 817111 to speak to an expert.

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EMCO 3850/2 50 A Single Phase LISN (50 µH)

EMCO 3850/2 50 A Single Phase LISN (50 µH)

Item no. 262

9KHz-100MHz, 50A

ONE OHM Resistive Load @ 500 Watts

ONE OHM Resistive Load @ 500 Watts

Item no. 268

30Hz-250kHz