Precompliance Testing: ISN (Impedance Stabilization Network)

[T3sl4co1l]

We've had topics on this forum before concerning EMC and impedance stabilization networks.  Most often, the automotive LISN (line ISN).

Equally important, but requiring a bit more finesse, is an ISN for signals rather than power.  This must pass a communication signal with little degradation, while extracting the common mode signal for measurement.

Rather than write an overly long and boring post about it, I decided to write an even longer and boringer web page:
http://seventransistorlabs.com/Precompliance/index.html

I'm pretty happy with it.  If you're interested, I can make a PCB and instructions for assembly.  The parts should all be commercially available...

Bonus picture for filling space:


Recognizable as one of the plug-in connectors.  Nice "etching", wouldn't you say?

Tim