Products > Test Equipment
HP 5335A Timer / Counter - Anything i should know?
Wrenches of Death:
--- Quote from: TERRA Operative on July 02, 2023, 04:55:50 pm ---Yeah, that's the one. Mine tested almost no capacitance so I think they dried out or something.
--- End quote ---
I received the Mouser order this morning and just finished replacing the A1C2 caps in three 5335A's, and removing and testing one from my parts hulk.
I installed 105C 180uf @ 25V caps.
I tested the old ones that I removed and found the following:
All were Sprague 672D 100uf @ 15V rated at 105C
A1C2 from SN 2152A024xx tested @ ~ 50pf with a date code of 8121H
A1C2 from SN 2424A061xx tested @ ~620pf with a date code of 8337H
A1C2 from SN 2448A066xx tested @ ~110pf with a date code of 8426H1
A1C2 from SN 2820A120xx tested @ ~143pf with a date code of 8812H
With the two that you tested and found bad, I think I'd go out on a limb here and state that it would be a safe bet to automatically replace A1C2 in any 5335A that crossed your path.
Thanks for your post that brought these to my attention!
I just pulled A1C2 from my parts hulk and added it to the above list. It's even worse than the other three.
WoD
TERRA Operative:
Yep, I agree. Mine tested about the same capacitance too.
Wrenches of Death:
--- Quote from: TERRA Operative on July 06, 2023, 11:13:53 pm ---Yep, I agree. Mine tested about the same capacitance too.
--- End quote ---
I had to place another parts order and went ahead and added a couple of pair of replacements for the 2000uf A1C12 and A1C13. I pulled the originals on the 2424A prefix counter this morning and they both measured 2100+uf with good D and ESR. I put them both back in for now.
While I had it apart, I pulled the 17,000uf A1C14 and tested it. It was in the high 15,000uf range. D and ESR were acceptable. I then pulled the smaller 8000uf A1C16 and it tested in the mid 7000uf range.
Both of these were within the -10% tolerance for those two cap positions, but I can foresee possibly having to replace them somewhere down the line. To be honest, I trust 40 year old US made high end Sprague caps more than the vast majority of the stuff that's out there on the market today.
Did you test any of these four caps in your counters?
WoD
TERRA Operative:
I took a chance and didn't bother with the big ones. From my experience, the big caps generally tend to last without much trouble.
I probably should throw them on the 4276A LCZ meter to check them.... I'll add it to the 'to-do' list.... A rather long list that is. :D
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