I have 4 each 83752Bs that are failing swept frequency accuracy just below the minimum spec. at all test frequencies. We have went through all of the alignments and it still fails the same at all points. We have verified our set up and used two different test stations.
Is there a service note on this problem? If so, can we get a copy of it to correct our procedure. It is odd that this is the only failure and and they are all identical.
There are no service notes on doing the swept frequency accuracy performance test.
Since the specification is _+/-100ppm of frequency span +/-frequency accuracy of the sweep generator timebase, your error could be the sweep generator reference frequency accuracy, the spectrum analyzer frequency accuracy, or just how accurately you are able to set video signal to a spectrum analyzer graticule and then reading center frequency of the SA in step 1 and then frequency setting in step 2.
Cannot do more to check this swept frequency accuracy performance test as we no longer have any 83752A/B generators in house.