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Re: Advice on how to use an SA for test point troubleshooting

 

Hi Tony,
I think the problem is related to the high frequency loop. However, you can first check the reference and low frequency loops.

On schematic 13 you find the phase detector U19 (ECL EXOR circuit). On pins 4 and 5 you shall have 10 MHz signals which are locked and 90 degrees out of phase. It is assumed that you have a 10 MHz reference signal connected to the instrument.

On schematic 10 you find the phase detector U17A and U17B. On pins 3 and 11 you shall have 100 (or 250) Hz signals which are locked and in phase.

G?ran
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