Turns out there have really just been two major issues so far with this new-to-me instrument. As I noted a few days back the pots on the A3 multiplier were intermittent, and twiddling them a bit got the instrument to lock up.
But it was off by about 77E-10. The mag field control had no effect. This instrument has Option H52. I've just learned this means the front panel mag field control is only there to fill up a hole in the panel. The control had been re-wired to a spare pin on the rear-panel DC power jack. All fixed now, and the mag field control works as it should. I ran through the RF alignment of A3, and all seemed OK there. Same for the Phase Detector, Integrator and Loop Gain alignment. All good. Except... Microphonics. What's the norm here? I see it in the 2nd harmonic level on the panel meter. It runs about 20 normally, but a pretty light tap (with my fingernail) anywhere on the instrument can peg the meter for a few seconds. While I had the scope on A8 TP2 / TP3 (showing the off-resonance phase shift peak it manifested as bursts of noise) It's hard to localize - but I think the RVFR and Synthesizer are the most sensitive. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.