Measuring high-Z chokes accurately is challenging, and it's easy to
become obsessive about this stuff. I know because I'm probably one of
the worst offenders :)
But then I ask myself:: if an uncompensated 0.5pF jig capacitance, or
uncompensated jig leads 1 inch long, cause an error in the choke
measurement that is operationally significant, variations in choke
installation method will likely have the same effect and more. On top of
that we have to remember the tolerance in ferrite characteristics -
variously quoted as 25%. So why strive for measurement accuracy that has
little direct relevance to most real-world installations?
Steve G3TXQ
On 03/01/2018 12:54, Wes Stewart wrote:
In my opinion, and with my equipment, a two-port through measurement
is probably the better method. That said there a lot of folks with
one-port measurement equipment who can make "good enough" measurements
on common-mode chokes.
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