Auto-calibrate for Analog Discovery 2?

[gasstationwithoutpumps]

How much would an "autocalibrate" board cost for the Analog Discovery 2 ?

I think that one could be designed using the new chip of the new DMM board, as the calibration procedure given in the documentation only requires an accurate DC multimeter.  Waveforms 3 already has an understanding of SPI and the necessary connections could be made with latching relays as on the impedance board (or with FETs).

In looking at student results in lab for the 25 AD2s we bought, it seems that they ship with offsets as much as a couple of millivolts.  Going through and hand-calibrating them would take too long and be very tedious (even if I had a trusted multimeter to use as a calibration source), but with an auto-calibrate board, we could get them all properly calibrated in an afternoon.

[attila]

Hi @gasstationwithoutpumps

The offset error could be due to the temperature drift:

You can use the Zero offset option in WF 3.8.5 which is intended as quick offset calibration for the Scope inputs.
https://forum.digilentinc.com/topic/8908-waveforms-beta-download/

 

[gasstationwithoutpumps]

That sounds like a nice feature—when is 3.8.5 scheduled to be released?

It would still be nice to have an auto-calibrate board, so that we could recalibrate the instruments on an annual basis—the hardware design would be fairly simple, and the software changes not much, given that there is already code for hand calibration.

[Piotr Rzeszut]

@gasstationwithoutpumps

It has ben just released as a beta: