Oh Guru's:
A circuit designer has suggested that we can double check the accuracy of
our TDR for measuring specific impedances by connecting the TDR's probes
directly to a precision resistor of the desired impedance. When I tried it,
I got a nice flat line on my scope, but alas, it was not exactly where my
instrument said it should be. In addition, different resistors yielded
differing amounts of error (4 ohm discrepancy at 50 ohm, 14 ohm discrepancy
at 100 ohm). My unit was calibrated by Tektronix only 2 months ago.
Therefore, my questions: Is the Electrical Engineer correct; is his
procedure accurate? There is no reference to it in any of our TDR manuals,
and I think that if such a thing were true, then mention should have been
made of it.
As Bartels and James would say: "Thanks for your support."

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