Using HP 4193A vector meter - RF Cafe Forums

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xile

Post subject: Using HP 4193A vector meter

Posted: Fri Feb 22, 2008 4:29 pm

Lieutenant

Joined: Fri Feb 22, 2008 4:01 pm
Posts: 2

Hi all,

New here. What does it mean if phase angle > 90 degree when calibrating the probe on the vector meter by connecting the probe to ground? The R component becomes negative! And at lowest possible frequency 400 kHz, the phase angle is not stable, jumping from -88 to + 100. Why?

Thanks in advance.

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Xile

skywave

Post subject:

Posted: Wed Sep 10, 2008 6:12 pm

Lieutenant

Joined: Wed Sep 10, 2008 5:49 pm
Posts: 4
Location: Central England

The rapid variation in phase could be because your "ground" is not really ground. There could be all sorts of RF pick-up, including the supply freq. and harmonics of it and all manner of other crap noise.

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Posted 11/12/2012

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