Products > Test Equipment

Rigol DP832 - Firmware list and bugs

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LaurentR:
Kazam,
every time I have run the script, it has been like this or worse for the DAC.

I have no definitive insight, but my theory is that the DAC is just outputting uncalibrated values (vs. values calibrated with the current calibration), which makes sense.

Having run the script many times during development, I have anecdotal evidence that this is what happened. I have more than once written totally erroneous calibration data and the supply was then totally unusable, but, even after that, the calibration script turned up similar results. So I assume it is indeed just ignoring current calibration values altogether while running the script. And in my experience, the DAC is off by similar (noticeable) amounts during calibration, with the ADC being very close.

Laurent

kazam:
OK, so is it safe to write this data then?

I was expecting to see the current calibration in effect before comitting and saving coefficients!

And thanks for the script, BTW.  :-+ I will upload ans share my Keithley version once I make sure it works.

/K



--- Quote from: LaurentR on February 26, 2016, 11:27:23 pm ---Kazam,
every time I have run the script, it has been like this or worse for the DAC.

I have no definitive insight, but my theory is that the DAC is just outputting uncalibrated values (vs. values calibrated with the current calibration), which makes sense.

Having run the script many times during development, I have anecdotal evidence that this is what happened. I have more than once written totally erroneous calibration data and the supply was then totally unusable, but, even after that, the calibration script turned up similar results. So I assume it is indeed just ignoring current calibration values altogether while running the script. And in my experience, the DAC is off by similar (noticeable) amounts during calibration, with the ADC being very close.

Laurent

--- End quote ---

bson:

--- Quote from: LaurentR on February 26, 2016, 11:27:23 pm ---Kazam,
every time I have run the script, it has been like this or worse for the DAC.

I have no definitive insight, but my theory is that the DAC is just outputting uncalibrated values (vs. values calibrated with the current calibration), which makes sense.

Having run the script many times during development, I have anecdotal evidence that this is what happened. I have more than once written totally erroneous calibration data and the supply was then totally unusable, but, even after that, the calibration script turned up similar results. So I assume it is indeed just ignoring current calibration values altogether while running the script. And in my experience, the DAC is off by similar (noticeable) amounts during calibration, with the ADC being very close.

Laurent

--- End quote ---
Indeed, during calibration it disables the calibration corrections, or it wouldn't be able to calibrate.  After calibration and installing new calibration data it's important to power cycle the PSU or it will continue operating without calibration data. If I were to guess I'd say it loads calibration tables during power-up.

LaurentR:
I just ran the calibration program on my setup. Looks different, but not better :-)


--- Code: ---Running DAC-V for channel 1
DACV Ch:1 - Step:0 - Nom:0.200000V - DMM:-0.110548V
DACV Ch:1 - Step:1 - Nom:0.500000V - DMM:0.189599V
DACV Ch:1 - Step:2 - Nom:1.200000V - DMM:0.883774V
DACV Ch:1 - Step:3 - Nom:2.000000V - DMM:1.677662V
DACV Ch:1 - Step:4 - Nom:3.200000V - DMM:2.875726V
DACV Ch:1 - Step:5 - Nom:4.100000V - DMM:3.772613V
DACV Ch:1 - Step:6 - Nom:5.200000V - DMM:4.859532V
DACV Ch:1 - Step:7 - Nom:6.900000V - DMM:6.556295V
DACV Ch:1 - Step:8 - Nom:7.500000V - DMM:7.156451V
DACV Ch:1 - Step:9 - Nom:8.700000V - DMM:8.348862V
DACV Ch:1 - Step:10 - Nom:10.100000V - DMM:9.744890V
DACV Ch:1 - Step:11 - Nom:11.800000V - DMM:11.444056V
DACV Ch:1 - Step:12 - Nom:12.600000V - DMM:12.240194V
DACV Ch:1 - Step:13 - Nom:13.500000V - DMM:13.133796V
DACV Ch:1 - Step:14 - Nom:15.000000V - DMM:14.624108V
DACV Ch:1 - Step:15 - Nom:15.800000V - DMM:15.419533V
DACV Ch:1 - Step:16 - Nom:16.500000V - DMM:16.115537V
DACV Ch:1 - Step:17 - Nom:17.300000V - DMM:16.911583V
DACV Ch:1 - Step:18 - Nom:18.500000V - DMM:18.105339V
DACV Ch:1 - Step:19 - Nom:19.100000V - DMM:18.707224V
DACV Ch:1 - Step:20 - Nom:19.900000V - DMM:19.505043V
DACV Ch:1 - Step:21 - Nom:20.200000V - DMM:19.800305V
DACV Ch:1 - Step:22 - Nom:20.800000V - DMM:20.398841V
DACV Ch:1 - Step:23 - Nom:21.800000V - DMM:21.389631V
DACV Ch:1 - Step:24 - Nom:22.400000V - DMM:21.989582V
DACV Ch:1 - Step:25 - Nom:22.700000V - DMM:22.289575V
DACV Ch:1 - Step:26 - Nom:23.900000V - DMM:23.482165V
DACV Ch:1 - Step:27 - Nom:24.300000V - DMM:23.879192V
DACV Ch:1 - Step:28 - Nom:25.700000V - DMM:25.280637V
DACV Ch:1 - Step:29 - Nom:26.900000V - DMM:26.476796V
DACV Ch:1 - Step:30 - Nom:27.900000V - DMM:27.470796V
DACV Ch:1 - Step:31 - Nom:28.500000V - DMM:28.067346V
DACV Ch:1 - Step:32 - Nom:28.900000V - DMM:28.462864V
DACV Ch:1 - Step:33 - Nom:29.800000V - DMM:29.346933V
DACV Ch:1 - Step:34 - Nom:30.200000V - DMM:29.744620V
DACV Ch:1 - Step:35 - Nom:32.000000V - DMM:31.525673V
Running ADC-V for channel 1
ADCV Ch:1 - Step:0 - Nom:0.000000V - DMM:-0.000376V
ADCV Ch:1 - Step:1 - Nom:0.050000V - DMM:0.049855V
ADCV Ch:1 - Step:2 - Nom:0.100000V - DMM:0.100064V
ADCV Ch:1 - Step:3 - Nom:0.500000V - DMM:0.500868V
ADCV Ch:1 - Step:4 - Nom:1.000000V - DMM:0.999522V
ADCV Ch:1 - Step:5 - Nom:5.000000V - DMM:4.998767V
ADCV Ch:1 - Step:6 - Nom:10.000000V - DMM:9.999298V
ADCV Ch:1 - Step:7 - Nom:12.800000V - DMM:12.799996V
ADCV Ch:1 - Step:8 - Nom:20.000000V - DMM:19.999685V
ADCV Ch:1 - Step:9 - Nom:30.000000V - DMM:30.002926V
ADCV Ch:1 - Step:10 - Nom:32.000000V - DMM:31.999284V

--- End code ---

bson:

--- Quote from: LaurentR on February 27, 2016, 03:42:45 am ---I just ran the calibration program on my setup. Looks different, but not better :-)


--- Code: ---Running DAC-V for channel 1
DACV Ch:1 - Step:0 - Nom:0.200000V - DMM:-0.110548V

--- End code ---

--- End quote ---
A negative voltage... How is that even possible?

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