Electronics > Repair

Repair : HP 3245A precision DC/AC source

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alanambrose:
>>> P.S. That D7000 of yours screams for more attention, it can produce much better images...  :)

Yes agree, v. lame images - I noticed that I had some better images on my phone - and, no excuses, as I have a nice macro lens that I couldn't be bothered to get out...

Ho ho, about including some of your images, apologies - I just copied over what I though was interesting from my \3245a\images folder - didn't notice that some of the backgrounds were different.

>>> we can do comparisons in drift/stability/noise

Good idea, I'm going to get a measurement set-up sorted out soonish ... atm I can't get ezgpib to talk to anything from win 7 64, so might revert to writing some code myself.

A.

TiN:
I'd suggest getting RPI so we can bodge some python GPIB sorcery. It's better to have standalone setup to do long-term measurements, so whatever you do on your PC would not upset ppm-level stuff :) P.s. I use Win2008R2 64bit (it's based on 7 x64) with EZGPIB, it works here okay (with NI GPIB USB pod though, not Agilent you have).

P.s. no problems about pic, you can take them surely.

alanambrose:
OK FYI these are the results I'm getting:

3245A setting (V)           0               0.01        0.1         1             10
sd (ppm of 10V range)    0.083       0.069      0.18       0.13          0.339
sd (ppm of reading)                       69           18            1.3            0.339

This is with a 3458A at NPLC=1 on the 10V range, no auto zero. I measured the 3458A with a short at 0.053ppm of range.

A.

TiN:
Paffnerr is out of the way now...



Also replaced all electrolytic caps on A6 PCBA, and while doing so, spotted a bit of QC control issue:



Little guy's lead was not formed properly.

alanambrose:
Nice, btw I'm assuming the block of foam you show on the original ref came with the machine? - there was none on mine.

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