Re: 3336B optional 10Mhz Osc. problems
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Hi,
Does the heater of the oven work? I had a similar case with a 3225b. The internal trimmer to set the oven disintegrated over the years. I carefully disassembled the oven and fixed. I measured to current consumption to first diagnose that the oven did not work. It was also obvious that the case was vold to thr touch. The frequency is way off when the oven is cold.
Szabolcs walter shawlee < walter2@...> ezt ¨ªrta (id?pont: 2019. szept. 3., Ke 21:54):
I have a 3336B that seems to be made of parts from both an A and B unit, but had the optional high performance ovenized oscillator installed (hp pcb 03325-66509) which is an Ovenaire OSC 73-52.
sadly for me, while I got everything else up and running correctly, the Ovenaire oscillator is WAY off frequency (+250hz), and can't be adjusted via the EFC or mechanical adjustment. if I use the external clock input, everything works correctly, with no offset.
Does anybody have either a good spare board or the Ovenaire oscillator available? Happy to buy or swap parts.
it has one other odd issue I have not seen before in any hp synthesized generator, it has a flutter or approximately 0.5-1Hz up and down (residual FM) at 10Mhz out. Is this some kind of loop instability that can be adjusted, or just how it works? my 5335A easily resolves 0.01Hz at this frequency, so this is very visible to me.
all help appreciated (best off list),
-walter (walter2 -at- )
sphere research corp.
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