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Why is a limter provided on the LISN

Why is limiting provided on the LISN


Is limiting needed?

Absolutely. When the mains voltage is switch on, a transient of 310Vp (when using 230Vac) may occur at the input of the spectrum analyzer.
LISN: Why is a limiter provided | ELab Tools

The transient voltage will destroy the input mixer stage if the spectrum analyzer, which will typically allow 30dBm (1W) or 136dBuV over 50 Ohm.

So the limiter is always required, but often not built-in. If you use a LISN without a built-in limiter, you may easily forget the limiter and damage the spectrum analyzer.

Note: The limiter can only work when combined with an attenuator. The our LISN’s use 10dB attenuation, which must be compensated for on your spectrum analyzer graph.


Interested? Ask our distributors

What limiting is provided

  • clipping to 120dBuV
  • attenuation: 10dB
⇛   LISN, limiter