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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Quantum Mechanics - the dreams that Stuff is made of.




Posted  11/12/2012