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E4443A PSA Auto-Align stability

Question asked by SteveReeves on Oct 7, 2011
Latest reply on Nov 23, 2011 by tabbott
What range of stability should the PSA series show during cycle-to-cycle run of the Auto-Align process as far as amplitude? I have one that initially showed a variance of +5 / -12 dB and showed an align error. These I believe are usually only a few tenths of a dB.

I've narrowed problem to the subsystem "Align RF" portion and suspect there's an intermittent RF switch, other than the input attenuator. The amplitude reference input is from an HP 3335A.

As I was writing this, I ran the Align RF again and my -10 dBm input display dropped to - 53 dBm. I checked the attenuator again and the AC/DC switch - both OK. I don't have a service guide for this and would like to download if available.

Steve Reeves  

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