Even worse, now the frequency counter shows ?all zeroes, plus "overflow". none of the counter buttons have any effect.
The RF output does exist, and the amplitude knobs both work.
AM and FM modulation appear to make changes to the RF output.
The frequency range switch or freq. dial do not change the output frequency, it stays at some random. fixed value.
---In hp_agilent_equipment@..., <eagle572@...> wrote :
I need help to fix the HP 8640B freq. lock. ?
The output freq. wobbles greatly and will not hold onto any frequency as set by the cavity dial.
Any help would be appreciated.
I have downloaded some manuals, but no trouble shooting information was found.
Cheers,
Steve Bell KJ7OG
