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HP 5335A Timer / Counter - Anything i should know?

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TERRA Operative:
So my turn to get one of these up and running again...  :-/O
I picked one up from Yahoo Auctions with options 010, 030 and 040 fitted. So far it seems to work ok, pending the usual relay/fan fix and whatnot.

I also need to replace the red 7-seg display cover as someone in the past must have used the wrong cleaner which caused it to warp severely and fog up badly. If anyone has a spare one of these (plus a few of the little black clip thingos), I'll be happy to buy it from you. :)

My question at the moment though, is my unit seems to have some extra blanked-off positions on the rear panel that don't seem to exist in any of the manuals I've found online.
I assume the 4 in the center are for moving the front panel connections to the rear, but does anyone know what the ones I circled in red are for? Maybe for rear panel connections to option 020?

LazyJack:
Yes, they are the rear panel options for the Voltmeter option. These options apparently were only available on later units, as older ones do not have the cutouts for the rear connectors.
I think the rear connections are option C10. They are connected in parallel with the front connector, so they will decrease the bandwidth, there is a service note about it.

David Aurora:
(Necroposting just to possibly keep useful 5335A info in one place)

I just picked up one of these last week from a forum member, thought to be working but it's a bit iffy on first tests. Just trying to work out whether these are normal quirks or if I should make some time to dive in properly and do some repairs.

First up is the startup condition- manual says it should boot straight into counting frequency on input A. I *think* I've seen it do that once maybe, but generally it doesn't. I get nothing until I manually press both COM A and auto trigger, then it works fine. Is that normal?

The other thing is rise/fall/slew modes. Period, duty etc all seem to measure and display fine, but I get nothing from rise/fall or slew modes. I shoved in the example signal in the manual (I think it was something like 400nS rise/fall, 10µS period, 1VPP, it's not in front of me right now), set it up as described and nada. Tried playing with all sorts of settings and I still got nothing. If I check trigger level it shows the 10/90% trigger points, so obviously it's measuring/calculating something at least, but for whatever reason it doesn't display the rise/fall/slew rates on the display. Am I missing something about using these modes?

David Aurora:

--- Quote from: David Aurora on May 23, 2023, 12:52:08 am ---(Necroposting just to possibly keep useful 5335A info in one place)

I just picked up one of these last week from a forum member, thought to be working but it's a bit iffy on first tests. Just trying to work out whether these are normal quirks or if I should make some time to dive in properly and do some repairs.

First up is the startup condition- manual says it should boot straight into counting frequency on input A. I *think* I've seen it do that once maybe, but generally it doesn't. I get nothing until I manually press both COM A and auto trigger, then it works fine. Is that normal?

The other thing is rise/fall/slew modes. Period, duty etc all seem to measure and display fine, but I get nothing from rise/fall or slew modes. I shoved in the example signal in the manual (I think it was something like 400nS rise/fall, 10µS period, 1VPP, it's not in front of me right now), set it up as described and nada. Tried playing with all sorts of settings and I still got nothing. If I check trigger level it shows the 10/90% trigger points, so obviously it's measuring/calculating something at least, but for whatever reason it doesn't display the rise/fall/slew rates on the display. Am I missing something about using these modes?

--- End quote ---

Scratch that, just popped it open and things started making sense. Channels were cross patched, not sure why but I'm guessing because of a fault, other bodges present too. Looks like I've got work to do

TERRA Operative:
Have fun, and be sure to do the relay/relay socket/12V fan mod for reliable operation.

Also, there is an electrolytic cap on the PSU section, just next to the small green edge connector that I have found is really needing replacement in 2 out of 2 units I've poked at so far.

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