I saw this thing on ebay... Labeled as "Aviation Signal Tracer Vintage RF Gear" and with a description of "Have no info on this one other that it was purchased as a single item from a deceased estate from a relative of the deceased. They were keen for it to find purpose. I had intentions to...
Thanks Bertus! I actually just found that myself and it answered most of my questions. But I'll give the win to you, because you found it 15 minutes before I did :-)
A constant current sink would be better. Also you want (in your example) about 5.8 ohms. Two 11.5 ohm resistors (not a standard value) would be close. 4 22 ohm resistors in parallel would be close enough. Two 7 ohm resistors (again, not a standard value) would give you 3.5 ohms, and a...
It would also be useful if you can determine what the power rails are and where this diode sits in relation to them. (e.g. is it in series with one of them, across them, or tied at one end to one of them, or something else)
OK, one of the alternatives is that it is a TVS diode, and this would explain what you see.
Do you know what voltage exists across this diode with the unit powered on?
Diodes generally fail short circuit rather than open, so I'd tend not to suspect this unless you have a good reason to.
It...
One option is a 1PMT5933B. This is a 22V 2.5W zener diode. the case for this is DO-216AA, and I'm not sure that looks like that.
What makes you think it is at fault?
Is it shorted?
Which end of the diode is more positive? (and what is the voltage drop across it)
Our state now has Covid-19 in the community. Pretty much everyone is triple vaxed. I believe we have zero deaths from vaccination in our state and only a very few who have had severe reactions (but there's only about 2 million of us). It's only just starting, with a couple of hundred new...
The service manual can be found here: https://www.valuetronics.com/product/pm5192-philips-function-generator-used#manuals
And a manual for the PM5193 (same unit except it goes to 50MHz is here: https://isurplus.com.au/manuals/Philips%20PM5193%20User%20Manual.pdf
Hope this helps
It's behaving quite well :)
Another project was adding a method of reading the actual leakage current in a safe way. This is a two edged sword. On the one hand, I can tell you to a fraction of a uA what the leakage current is, but on the other hand it's not a go/no-go test any more :-D...
Thanks a lot @MHW That is GREAT information.
Please keep us updated as to when the website with the historical information will be available to look at.