Interesting Alternative to a LISN

[charliedelta]

I came across this device while surfing for a new LISN.

Looks like a  good product in concept. Dont know the price and know nothing about it.

https://www.onfilter.com/emi-adapter-msn15

There is a EDN by Wyatt which gives it the thumbs up

Considering what LISN's sell for it might be a perfect EMC diagnostic tool.

Anyone use one?

[nctnico]

It is a nice tool to monitor AC content on power lines but it is not alternative for a LISN. The purpose of a LISN is that it provides a well defined (simulated) line impedance so you can make absolute measurements.

[T3sl4co1l]

So... it's >10nF, a resistor and a >300uH transformer?  Handy I suppose, if you're doing that sort of thing.

The isolation is interesting, I suppose one might save the isolation transformer in building a LISN, but still need isolation, for which a nice wideband transformer would do.  This can be patched on pretty much any time.

Tim

[charliedelta]

Nobody is suggesting that this device will take the place of  CISPR LISN. 

It would make a handy pre-compliance  tool for design work. I suppose it would not take much to do a baseline comparison to see how much  error it has in terms of level measurements when comparing it to a true CISPR standard LISN

It is a nice tool to monitor AC content on power lines but it is not alternative for a LISN. The purpose of a LISN is that it provides a well defined (simulated) line impedance so you can make absolute measurements.

[charliedelta]

The circuit is published somewhere on the net.

It uses a Schaffner or other EMC line filter 2 coupling capacitors grounded through resistors and then a 20db attenuator for the receiver. Its simple enough to make and nothing special or CISPR certified! I suppose if you lazy you can just use a current probe!

I suppose a LISN is not something that you leave laying around on your workbench when doing devlopment or pre-compliance work!  A tool that can quickly do spot measurements without killing yourself or tripping the  RCD breakers would be handy.