Products > Test Equipment
Rigol DP832 - Firmware list and bugs
JDubU:
--- Quote from: aristarchus on March 17, 2020, 09:55:48 am ---The extended number of calibration points is also mentioned in this thread
-> https://www.eevblog.com/forum/testgear/rigol-dp832a-automatic-scpi-calibration-script/
with another calibration script, a bash one.
--- End quote ---
Good catch!
I did some experimentation with added control points using the Python calibration program and got good results with the attached DP832Cal.py. For channels 1 and 2, it has 46 voltage calibration points and 31 current calibration points. I did not change the calibration points for channel 3. You can freely change the number and values of the calibration points in the top of the file. No other changes need to be made in the program (gotta love Python!).
I have not yet tried a lot of variations on the number or values of the calibration points but did find that it gets a bit unstable with too many points near zero. The ones in the bash script did not work as well and caused my zero volts to go negative after that calibration.
McBryce:
--- Quote from: Gandalf_Sr on March 16, 2020, 08:44:44 pm ---Here's a picture of my calibrated DP832(A) sending 5.000V to my 34461A :D
--- End quote ---
If I had the results you're showing here I'd be worried. It's saying that the output is quite a bit higher than it should be unless those cables you're using have absolutely no voltage drop? Which is unlikely.
McBryce.
JDubU:
--- Quote from: McBryce on March 17, 2020, 05:40:35 pm ---
--- Quote from: Gandalf_Sr on March 16, 2020, 08:44:44 pm ---Here's a picture of my calibrated DP832(A) sending 5.000V to my 34461A :D
--- End quote ---
If I had the results you're showing here I'd be worried. It's saying that the output is quite a bit higher than it should be unless those cables you're using have absolutely no voltage drop? Which is unlikely.
McBryce.
--- End quote ---
The DMM has a 10 Meg ohm input resistance. Even if the leads had a total of 1 ohm resistance, the voltage drop would be half a microvolt.
skander36:
On some points is X.000 (like 5.000/7.000/10.000) and other is X.999 (like 4.999/7.999/21.999) . It is not a high precision multimeter with a very stable reference though ...
skander36:
@garrettm
It will be more easy to verify the status of calibration if the displayed read value is displayed in real values , not scientific .
step 0, cal point: 0.2v, meas val: -1.54019811E-01
step 1, cal point: 0.5v, meas val: 1.46975726E-01
step 2, cal point: 1.2v, meas val: 8.42319390E-01
step 3, cal point: 2v, meas val: 1.63485328E00
step 4, cal point: 3.2v, meas val: 2.83015883E00
Thank you !
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