And what is your square wave rise time and other signal charateristics. Adjustments need do with equipments what are listed in service manual or comparable. In this case HP8116A programmable pulse fenerator. If not available, then need look carefully HP8116A specifications and use something what is as near as possible (because in service manual, text is valid for named equipments) There is quaranteed rise time and overshoot etc.
Every step in HP service manual is just perfectly right. This is not made in china.
Uh - yea, I know it's not made in China, it's made in the U.S.A.
I do not have the specified pulse generator, so I'm using the best I have - a Rigol DG1022 which has the following specifications for the square wave -
Rise/Fall Time < 20 ns (10% to 90%), (Typical, 1kHz, 1 VPP)
Overshoot < 7.5% (Typical, 1kHz 1Vpp)
It may not be fast enough rise time, but I'm not going to go out and buy a specific pulse generator just for
one alignment on
one scope. I'm dong a restoration the best can do with what I've got at the moment.
Besides, I was able to do a decent job by just using a higher frequency square wave which clearly showed me the adjustment changes. If the adjustment for the 100 Hz square wave (using the generator specified in the manual) were to have been
in a different position than it is now (meaning the position I adjusted it to for the 10 kHz F), then the higher frequency square wave would have looked terrible. So you see, the adjustment now has to be very, very close to what it should be anyway, or the higher frequency would not look flat. There is not a different adjustment compensation capacitor for different frequencies - only one. It can only be in one position when you are done. Do you understand that?
Also it is good practice to follow paragraph 4 order starting from 1, every step in order. This is how it is designed to do. (if know exatly what is doing then also know where can do different and how to execute own procedure)
Yea, yea, I did follow it in order ... Give me a little credit LOL.
If on your board things do not go as in manual, there is two reasons, device is somehow failed or you do something wrong. One problem where things do not go as in manual may be wrong instruments used for job.
Manuals have errors from time to time, I'm not talking about HP specifically now but in general. But I want you to look at an attachment I scanned in from the manual for my HP 5334B, and read the text right under
ABOUT THIS SUPPLEMENT and tell me what it says there ...
remember this is an HP manual.
I've seen errors in manuals before. So to claim it doesn't happen is just factually incorrect. Things can go wrong because of three reasons - device is somehow failed, you do something wrong,
or there is an error in the manual procedure.And as I said, I'm not going to buy the
exact generator or a new generator that has the exact characteristics of the one specified in the service manual just for this one specific alignment (if that's what the problem is). If I get a better one (waveform generator) someday I'll go back and see if what you say is true, but for now it's as good as it's going to get, which is pretty damn good.
There are several things I need to do now. I need to finish the alignment checks, the only one left is the Oscillator Output Check. Then I will be making two new cable assemblies for the Ac and DC calibrator outputs on the back. Even though only one is bad, I'm just going to make two new ones so they match.