29 Jul
2006
29 Jul
'06
8:52 p.m.
Well, it's vintage, anyway.
I took out my HP 5307A counter yesterday and discovered that it has decided
to go insane. While the CHECK function correctly registers a display of
1's as it should, external frequency measurements are complete nonsense.
60 Hz, for example, shows up as 112 Hz. A quick check of power supply
voltages shows they're all within about 5% of nominal value; there doesn't
seem to be more than a couple of mv. of ripple. The 10 MHz oscillator is
right at 10 MHz.
Any ideas or suggestions? It'd be nice to have "old reliable" back again.
Cheers,
Chuck