Products > Test Equipment
HP 3245A universal source refurbishment and upgrades
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deepfryed:
Hi,

I recently acquired a HP3245A in reasonable condition. It looks like someone's dropped something heavy on it, some dings and gouging of outer metal cover. The front bezel's a bit crushed causing the plastic decal to detach. The VFD display's a bit dim, so replacing the electrolytic caps and the display is first on my list.

I have read through TiN's blog post on the 3245A repair, it sounds like the replacement VFD's on eBay for 3458A would be compatible - is that correct ?

Also any chance of upgrading this with Option 002 (x10 amplifier) or is that going to be impossible ?

Against my better judgement, I did power this on briefly to spot check some DCV and DCI values and seems to be in the ballpark of what I'd expect.
deepfryed:
and it looks like someone's been inside and replaced at least one of the electrolytic caps with a dodgy repair job after the last calibration done by "Agilent"

the board is in good condition otherwise, can't spot anything dodgy other than the soldering job on the 199/399 reference but don't want to touch that for now.
deepfryed:
Ian's made an excellent series on repairs.

Part 1 -
Part 2 -

Thanks Ian, much appreciated!

I'll try and get a 3458A VFD. Also interested in the other upgrades, FRAM and the Opamps. I might look into them next.
alm:

--- Quote from: deepfryed on October 20, 2023, 11:07:54 pm ---Also any chance of upgrading this with Option 002 (x10 amplifier) or is that going to be impossible ?

--- End quote ---
I'm sure it's possible to create a clone of the board, like someone has done for the HP 3325, but looking at TiN's article the BOM costs look pretty high to me. Power amplifier is $145, the five hermetic VPG resistors and metal can OPA627. I doubt the total BOM will be under $500.
TheSteve:
I'd use FM1808 DIP FRAM devices, no adapter boards needed. They work fine in mine.
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