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Thanks for all the tips, guys; really helpful. I've found a very readable and comprehensible description of the various functional blocks concerned and how they inter-relate to one another in the

Ok.? Just wondering because it seems whenever I need one, all I have is the other!? So tempting to just turn it upside down....JimSent from my T-Mobile 4G LTE Device

works for me, although seems the condensation is worse with canned air, may be my imagination. Renée

Say, anybody know any disadvantages of using freeze spray as a duster or a duster as freeze spray?? Turn one upside-down to make it work as the other, of course.? TIA.Jim FordSent from my T-Mobile

@Jim: I too am a big fan of freeze spray. It can really root out faults that would otherwise be very difficult to diagnose with bench equipment, especially intermittent issues like this. I gave each

Can't beat that for service :-) Robert G8RPI. (happy Galep 4 owner)

Additional thoughts on the REF unlock - If it appears whenever the 8566 has been off long enought for the oven to cool down, that is an indication that either the 10 MHz Ref oscillator has drifted

Yes - Matt is correct - I forgot to advise about the warm up time - also there is o real problem about the battery - plan on replacing it but it will not cause YTO unlock. Cheers! Bruce Quoting Matt

I think my best course of action is to make a replacement circuit on a drop-in PCB, I have the tools and skills to do so. The online store I contacted regarding a replacement IC did not have any.

To add to Bruce's answer: the REF unlock can occur when the OCXO oven is warming up. If the unit has been plugged in (doesn't need to be powered on, since the oven supply is active anytime the

You're absolutely right about that. I checked one of mine and OHMS/AMPS is, indeed, shielded. Apologies for the misinformation. Thanks, Barry - N4BUQ

The 410C is different.? The 410B has regular wire for Ohms, Commnn, and (except for the resistor) DC.? Well the DC may be shielded (not coax).? The AC probe is fancier with filament voltage for the

So the REF unlock will be a major problem - you need to fix that before addressing the YTO unlock. Be sure the internal REF (10 MHz) oscillator is on frequency and that the INT/EXT switch is set

Hi, Just checked my HP 410C, and only Common is regular wire, both Ohms/Amps and DCV are coax. Regards, Askild [email protected]> wrote:

@Bruce I only had very little time this evening to investigate further, I'm afraid. Not even enough time to try shortening the ground clip lead! I will try out everyone's suggestions in due course,

Don't forget the resistor in the DC probe.

If you are working from a scan of 08640-90017 that doesn’t have schematics, you can find those same schematics in military manual “TM 9-4935-601-14-7&P”. It is written for serial number prefix

Among the many defects of the 8596E that I am trying to repair there is also this one, performed the autocal frequency freezes on the amplitude, could you identify the probable causes?

COMMON and OHMS/AMPS is regular probe wire. DCV is shielded (coaxial). ACV is shielded with two conductors (triaxial). Thanks, Barry - N4BUQ

Hi, Some of these are screened (caoaxial) wires, but the screen is only connected inside the instrument, and not connected on the probe. So please check how many of them are coaxial. Or maybe someone