Originally Posted by
Blacky
Select: F4 Options -> F4 Self Tests -> F4 Self Tests and monitor the second bottom row of figures. Those figures are the raw A/D counts that the A/Ds are measuring. With nothing connected they will normally read around 0-1.
Connect a 1.5V AA battery to AD2 and see if the value changes. (Use cancel to exit the test screen)
If it does not change then AD2 is toast.
If it does change, then select the option: F4 Options -> F4 Self Tests -> F3 External Sensors -> F1 Display Sensors.
Connect the battery again and monitor the 4 AD voltage values. If AD2 does not change, then it is a calibration error. I.e. the raw AD input is not being translated to the correct voltage.
Regards
Paul