On 5/26/22 8:24 AM, Richard (Rick) Karlquist wrote:
The tweezers are really good *only* for single components - even if they
come with test leads, that's for measuring something like a motor start
capacitor.
I tried using tweezers (cheap ones to be sure) to measure a moderately
complex assembly (trying to figure out stray C). It was a gruesome failure.
VNA's of any kind (no matter how small their size) don't work well on
components that are too far away from 50 ohms, at least if
you make a simple minded s11 smith chart measurement. There
are complicated work-arounds for these measurements, but they
require different configurations depending on what you are
measuring, so there is no turn key or universal solution.
https://www.mwrf.com/technologies/test-measurement/article/21849791/copper-mountain-technologies-make-accurate-impedance-measurements-using-a-vna
describes the various approaches
With the low price of available VNA's, anyone can afford to
buy one, but that doesn't mean they know how to use it correctly.
Oh man, is that ever true.
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