On 5/26/2022 10:24 AM, Lux, Jim wrote:
https://www.mwrf.com/technologies/test-measurement/article/21849791/copper-mountain-technologies-make-accurate-impedance-measurements-using-a-vna
describes the various approaches
I don't know how long these methods have been in use, but I
independently (re)-invented them around 40 years ago. At the
time I was working for HP and attempted unsuccessfully to interest
various HP business units in publishing this as an ap note, as
copper mountain has. Meanwhile I taught them to numerous
hams, clients, and HP engineers, etc. Fast forward now to 2022 and
nearly everyone knows about them.
As useful as they are, they have serious limitations:
1. The high-Z workaround requires the DUT to be floating.
2. The low-Z workaround requires the DUT to be grounded.
Can anyone suggest workarounds for the workarounds?
Rick N6RK
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