Can anyone explain how to read the spec sheet for Analog Out for a DAQ 6229?? Particularly the DC Offset. I go thru a number of iterations where I put out a DC voltage from an AO channel on the DAQ. -8.0 to +8.0 in steps of 1 volt. One step is zero volts DC. Zero volts DC +/- what offset???? Currently I get about 13 mvdc.