Electronics > Repair

Repair : HP 3245A precision DC/AC source

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TiN:
I care.
Perhaps using logarithmic scales would be more easier to read for DCI? Worth a try, but would need bit of inversion/sign fiddling for negative side...

alanambrose:
Oh yeah I forgot, it was you who got me into this in the first place :)

Max DCI error is 5nA < 1mA (5ppm) and ~1nA < 0.1mA (10ppm). I've updated the DCV graphs also. There seems to be a ~+5-10uV offset on my unit on the lower ranges.



TiN:

--- Quote from: alanambrose on December 15, 2015, 09:53:19 am --->>> Nice. Can you share program code, I can try on mine.

Hey TiN,

OK alpha-quality app here:

http://anagram.net/nuts/3245A/calibration/


--- End quote ---

Hm, seems you removed app from folder?
I got around finally getting VISA back on my Win PC, so wanted to give it a whirl, but no exe anymore.
Can you upload it once again ? :)

TiN:
I found it, running now.

Seem there is little bug, if frequency a bit higher than 60Hz, program throws error:


--- Code: ---00:35:27 DMM LOCK OFF sent
00:35:27 DMM LOCAL sent
00:35:27 *** Connection closed ***
*** Exception - invalid line frequency '60.0056348' ***
--- End code ---

I have to rerun it 5-10 times to catch that 59.9x Hz dip to start.

Here's data I got:


Smoke check log
First performance verification test
Precal test
Calibration log
Postcal log
Post cal perf test log


I'd be happy to test current too, if you have version with it.



Also another idea, perhaps results will be bit better if measurements at 3458A would be done with multiple samples, let's say 10-20 samples each step, and ignore first and last 3 samples. Just to make sure it all settle nice and tidy. Maybe run average for remaining samples too. I rerun perfcheck few times, and results were bit different each time.

alanambrose:
Well v. nice accuracy - do you think this is the result of your LTZ mod? Did you figure out how the LTZ translates to better cal accuracy - not sure I get that yet?

Will fix the 60Hz thing and supply the DCI version shortly.

Alan

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