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Hantek 2000 series - 2C42/2C72/2D42/2D72
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gf:
Actually I've no clue :-//

Did the calibration survive a power-cycle when the HantekHTX2019031201 firmware was installed?

IMO they are saved. I had upgraded (my genuine 2D72) to a later firmware than HantekHTX2019031201, w/o noticeable loss of calibration data, but I have indeed not upgraded to the most recent firmware yet.

Just a guess: Maybe the AWG calibration data are reset by the firmware (deliberately) if the device model is not a 2Dx2, in order to motivate people to buy a 2Dx2?

If the firmware or the firmware upgrade would reset the calibration data unconditionally, then the device could never retain the factory calibration.

[ IIRC, the calibration feature was only present in the 2019031201 firmware because a bug in a previous firmware release garbled the calibration data. So Hantek had the need to provide a solution in order that users of the buggy firmware can re-create the lost calibration data. Later, the feature disappeared again. ]
mostorer:

--- Quote from: gf on April 11, 2020, 08:05:03 am ---Did the calibration survive a power-cycle when the HantekHTX2019031201 firmware was installed?

--- End quote ---

To be honest, did not try. I will revert back to the AWG calibration firmware and try.


--- Quote from: gf ---Just a guess: Maybe the AWG calibration data are reset by the firmware (deliberately) if the device model is not a 2Dx2, in order to motivate people to buy a 2Dx2?

--- End quote ---

Could be but ... it seems that the firmware recognize the difference between 2c and 2d based on the presence of components, as in Sysinfo my scope appears now as 2d42


--- Quote from: gf ---If the firmware or the firmware upgrade would reset the calibration data unconditionally, then the device could never retain the factory calibration.

--- End quote ---

Fully agree.


But ... am I the only one who changed from 2cx2 to 2dx2 ? I suppose no. So, what about AWG calibration for someone else who did the same thing ?   ???
mostorer:
Tried newly the AWG calibration. Done!
Switch off and then on the scope ... calibration data did not survive  :(

So, what is the use of a calibration function if data are not saved ?  ???
The firmware is the same for all models, so it's strange that it behaves differently.

The only thing that comes to mind is that there are some operations to do after calibration, to make the data permanent.


--- Quote from: gf on April 11, 2020, 08:05:03 am ---[ IIRC, the calibration feature was only present in the 2019031201 firmware because a bug in a previous firmware release garbled the calibration data. So Hantek had the need to provide a solution in order that users of the buggy firmware can re-create the lost calibration data. Later, the feature disappeared again. ]


--- End quote ---

I understand but, I thought the firmware was a test release or something like that as it is completely unusable ... look at the attached image.
Is it something happening just to me ?  :-//

Microcheap:
Interesting, Hantek must have changed something in the later FW or FPGA, I've used the FW "HantekHTX2019031201.dfu" many times before to calibrate the AWG amplitude and it worked perfectly. I decide to test it now and indeed, the screen is inverted.

Regarding it not holding the calibration data, try to restore the device to factory default to see if it makes any difference.

I tried to revert to an earlier FPGA version to see if it work but still the same thing.
mostorer:

--- Quote from: Microcheap on April 11, 2020, 05:22:41 pm ---Regarding it not holding the calibration data, try to restore the device to factory default to see if it makes any difference.

--- End quote ---

Restored to factory default, run scope calibration and then the AWG calibration. All ok.
Switch off and on ... AWG not calibrated. Really a strange behaviour.

I think I will have to work on Rset to reduce the output current, so to have the correct signal amplitude out of the DAC, without calibration.

In the next days I will review the DAC902E datasheet in order to check, based on current Rset, res on Iout and OpAmp gain, if the output is aligned to what it should be, then I will calculate a new value for Rset and will post my considerations.

In this moment an amplitude of 1V produces 1,25V on the output channel.
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