That's normal. The input line floats when nothing is connected. I found it to
eventually stabilize but you'll most likely want to put a buffer amp on input
lines anyway.
--- In Satish Chetty <> wrote:
>
> Hello,
> I ran the ADC program provided by TS on the 7260 and I get the
> following values even when nothing is connected to the pins. Is that
> normal? Any calibration to be done?
>
> Thanks,
> -Satish.
> ---
> $ ./adc_7250
> Calibration Values =
> [ 0xffff 0xffff 0xff 0x0 0xf300 0x9940 0x9d 0xff00 0xffff 0xffff ]
> Board has been calibrated by Technologic Systems...
> Channel 0: -1.274V
> Channel 1: -205.301V
> Channel 2: 1.631V
> Channel 3: 1.311V
> Channel 4: 0.604V
>
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