Rigol DP831/DP831A Calibration Script, using DM3086

[2N3055]

Rigol DP831/DP831A Calibration Script, using DM3086 Calibration Script

This script allows calibration of a DP831/DP831A using DM3086 by python-ivi. The calibration script was based heavily on a previous script by[ Stupid Beard on the EEVBlog forums ],
 which in turn was based on a [bson on the EEVBlog forums](https://www.eevblog.com/forum/testgear/rigol-dp832-firmware-updates-and-bug-list/msg650855/#msg650855),
 which in turn was based on a [MATLAB script by LaurentR](https://www.eevblog.com/forum/testgear/rigol-dp832-firmware-updates-and-bug-list/msg587350/#msg587350).

The SCPI calibration information came from [TooOldForThis](https://www.eevblog.com/forum/testgear/rigol-dp832-firmware-updates-and-bug-list/msg556101/#msg556101) and [ted572](https://www.eevblog.com/forum/testgear/rigol-dp832-firmware-updates-and-bug-list/msg558318/#msg558318).

Made all the changes to the calibration tables that are different from DP832..


## Requirements

* [python-ivi](https://github.com/python-ivi/python-ivi)
* [python-vxi11] (https://github.com/python-ivi/python-vxi11) for TCP/IP support
* [numpy-1.11.1] (used prebuilt windows 64bit version)
* A Rigol DP831/DP831A Power Supply
* A RIGOL DM3086 6.5 Digit Multimeter


Tested using Python 3.5.2 on WIN 7/64bit and has not been tested on other platforms.
Used windows only sound lib.. (now a proper ping machine  )
On other platforms should be changed to some other method of creating sound....

## Using it

See the comments at the top of calibrate.py and change the settings as appropriate, then run the script.

I recommend doing Manual Cal/ Calibrate ADC Board before calibration cycle on that channel .. It made for more accurate cal for me.
Also I recommend doing calibration one channel at a time..  Less confusing that way..

Make sure to pay attention when calibrating CH3... When measuring voltage values are negative and sent as calibration info as negative..

But DP831/DP831A expects current calibration values to be positive for all channels, even on negative CH3  ... ... so make sure to reverse measurement leads only for CH3 CURRENT measurements

Like so:

CH1 Voltage RED--RED / BLACK--BLACK
CH1 Current RED--RED / BLACK--BLACK

CH2 Voltage RED--RED / BLACK--BLACK
CH2 Current RED--RED / BLACK--BLACK

CH3 Voltage RED--RED / BLACK--BLACK
CH3 Current RED--BLACK / BLACK--RED 


Of course, that could have been done in a script...  , but was too lazy... just reverse the leads...


## Quick note on current ranges

Rigol DM3068 has 10A current input.. No manual entry needed.. Too lazy to take it out from the code...


Ran it few times (more like dozens.. I guess I have an extremely well calibrated instrument now    )
and seems fine... No guaranties though.. use it at your own risk...

Anybody needs a help with it, let me know, I'll help if I can..

Cheers,

Sinisa