Re: S-parameter test sets

For single ended measurements, 50 ohms is certainly the most common I
have used. Differentially (obviously :), it's 100.

There are add-ins / replacement plugin units available for most of them
to get them at 75/150 (for slightly older fibre channel, in particular,
which is nominally 150 differential - the newer devices are
selectable).

Cheers

PeteS

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