When I use the SPCL Menu ADC Key I obtain the following error A to D CORRN, Error 2008. No other errors are listed. What does this indicate? After the ADC Cal I obtain the following readings with a constant voltage. Resolution: 8 digit 10.000 106 7 7 digit 10.000 107 6 digit 10.000 28 5 digit 09.999 9 4 digit 10.000 Thanks, John