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Weird Level Shift on ADuC7060 eval board

Question asked by KevinM on Jun 3, 2013
Latest reply on Jun 5, 2013 by KevinM

This probably doesn't have anything to do with the eval board, but I am going to ask anyway.  I am using the eval board in a standard steel enclosure with a touchscreen computer mounted in the door.  I am using a 120 Vac to 12V DC power supply to power both the eval board and the touchscreen.  Our circuit uses a strain gauge on channel 1 of the Auxiliary ADC, which works just fine.  However, we have found that when we touch the touchscreen or the enclosure, the measurements from the strain gauge increase.  Does anyone have any idea what might cause this?