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Repairing HP 8592D analyzers (Shifted frequency)
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DavidAlfa:
I've been tasked to repair test equipment at work, most are simple repairs, i.e. overloaded output stages, blown transistors...
Now I have several HP 8592D analyzers, the service manual is a bit of a nightmare so I was wondering if anyone had similar issues and could show some guidelines, the reported frequency is shifted ~200KHz lower and slowly gets to 500KHz as it warms up, so 300MHz signal appears as 299.5MHz.
Tried the self-calibration, never gets better than that.
One was about 80MHz wrong before calibration, also calibrating 500KHz lower... ::)
Tested the test signals with another analyzer, both are pretty good, outputting 300.01MHz/299.998MHz.
Then a third one reads 10dB lower when cold, fixes itself when warming up, so I hope it's some defective connection, didn't look at it yet.
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