I also have a 3325A and it is located exactly as yours, just above my bench. I'll be checking the spurious noise level as well and will report back!
@davidv1289
3 күн бұрын
A lab coat to wear in the lab, very cool! I was wondering if you tried the DAC Offset (para. 5-8) and Analog Phase Interpolation alignment procedure (para. 5-10) on your original A21 board. API alignment removes or minimizes spurious output from the VCO output. I ask because I recently repaired a 3325A and ran the entire alignment procedure. Regards, David
@garyramsey4275
3 күн бұрын
I went through the entire adjustment procedure, hoping that it would help. It did not. I’m sure, with enough time and effort, I could repair the problem to component level, and I will probably do just that at some point. Then I’ll have two working 3325As!
@CraigPetersen12f36b
5 күн бұрын
Nice, I also have a 3325A and just did this test myself. I used a HP 70K series SA and discovered using the same parameters of CF 1MHz, Span 1MHz, RBW 300Hz and 1kHz VBW my 3325A @ 1MHz, 0dB out measures -89 to -88.42dB @ 400kHz from the carrier. I have also measured the phase noise performance of the 3325A that I have and have discovered that it is well within the specifications listed in the service manual. These instruments will last seemingly forever if properly cared for. *edit* Guess I'm going to have to get a "lab coat" now. :)
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