Electronics > Repair
HP 53310A - Power supply troubles
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SoundTech-LG:
Had mine for a few days. All options except oven, but I'll use a GPSDO or Rubidium Ref. Cleaned it out thoroughly. Today I took the PS apart, pulled the board, and inspected carefully for any signs of leakage around the caps. None showing, but I still need to check the supplies. There seems to be a few different threads for this analyzer.  Quite a handy piece. Saw someone used 2 MeanWell supplies to fit inside the case, rather than the labor of changing all those caps, and saving some current waste at the same time.
kj7e:

--- Quote from: SoundTech-LG on May 06, 2019, 01:35:48 am ---Had mine for a few days. All options except oven, but I'll use a GPSDO or Rubidium Ref. Cleaned it out thoroughly. Today I took the PS apart, pulled the board, and inspected carefully for any signs of leakage around the caps. None showing, but I still need to check the supplies. There seems to be a few different threads for this analyzer.  Quite a handy piece. Saw someone used 2 MeanWell supplies to fit inside the case, rather than the labor of changing all those caps, and saving some current waste at the same time.

--- End quote ---

You will need to pull a few caps to see if they are leaking, at that point may as well just replace them.  Its really not that big of a job, I fully re-capped two of them recently.  I saw the post where the computer supplies were used, that looked like more work than just re-capping the original supply.
wn1fju:
"Saw someone used 2 MeanWell supplies to fit inside the case...."

I was the guy who did this and I unfortunately must conclude that I don't recommend this solution.  Indeed, the Meanwell supplies exhibit some sort
of switching noise which was easily picked up by the 53310A circuitry, despite my attempts to shield the supplies.  I don't remember the exact frequencies,
but it was in the 0-100kHz range as expected.

Ultimately, I went back to the original Boeschert supply - after I fixed it, of course!
SoundTech-LG:
Well that is certainly useful information.  :-+ I won't be going down that road then. I checked carefully around all caps, and don't see any evidence of leakage, and the unit operates flawlessly, passing all self tests as well. I hate to tear it down to board level again. I'll check the supplies for voltage, and ripple, and give it more thought.
maxwell3e10:
I suspect it depends on the history of the instrument. At work we have 3 of them and none had problems so far. They are  powered on nearly continuously. Electrolytic capacitors start to fail if not used for a long time. So if your unit was in storage previously, its more likely to start failing once turned on again.
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