FYI, I've been told by Technologic Systems' tech support that there were some
issues in production where the ADC would get calibration, then a software
programming process would overwrite the ADC values with incorrect ones. TS
apparently has binary that can fix the problem, but it would not run on my
system. I asked for them for the source. If I get it, I will run it and let
the list know about the results.
Don
--- In Clark Dunson <> wrote:
>
> Once again Don, you and I are near the same place in development. I
> checked
> the memory map for the TS-7250, and it looks like what TS did is keep
> the map
> the same, best they could, so these addresses match between 7250 & 7260.
>
> Like you, I got -718.8 volts on one unit and -758 on another. I
> noticed that the header file
> has a call to write those values. I'm going to have to try it,
> because we are
> managing a solar charging system. I have a bandgap supply here that
> I will
> attempt to use on the two open channels as a calibration. Should be
> an interesting
> afternoon.
>
> best
>
> On Mar 10, 2011, at 12:49 PM, Rekcut_Nod wrote:
>
> > Is there a way to determine how good the ADC calibration values
> > are, or to recalibrate the ADC?
> >
> > Running the sample code adc_7250.c, the executable tells me that
> > the board has been calibrated by Technologic Systems, but the
> > voltages reported seem unrealistic (e.g. channel 1 reports as at
> > -708V, and user input 0 reports as at 1.5V when it is grounded).
> >
> > If I comment out the part of adc_7260.c where it checks if the
> > board has already been calibrated (i.e. force it to NOT use the
> > calibration values), the results seem more realistic (e.g. channel
> > 1 reports as 0.808V and user input 0 reports as 0.08V when it is
> > grounded).
> >
> > I sent TS a question about this earlier, but have not yet received
> > a response.
> >
> > Don
> >
> >
>
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