[AMPS] Re: Circuit for measuring RF voltage...

[Peter Chadwick]

Rich said:

>I use a BNC "T" with stiff wires soldered to the pins on one side.  This
>allows me to clip on a 100 to one oscilloscope probe,  allowing me to
>measure V across 50-ohms.


I haven't seen an analogue 'scope guaranteed to an accuracy of better than +/-5%
of full screen.  That means a possible power error of around +/-10%, excluding
probe errors. Digital ones can get to 1%, although you have to watch analogue
bandwidth ratings, and aliasing problems if you're not running single tone. Add
the probe error too. Any of these methods requires calibration against a known
power source at the frequency of operation.

73

Peter G3RZP


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