Analog Output in the 4000
The analog output card has 4 channels. Channels 1 and 3 produce a 0-10 volt output, and channels 2 and 4 produce a 0-20 milliamp output.
To recalibrate a channel on the analog card, measure the output at two points:
ActualHigh,DesiredHigh
ActualLow,DesiredLow
Recompute the gain:
NewGain = OldGain * (DesiredHigh - DesiredLow)/(ActualHigh - ActualLow).
Then, tweak the offset until the actual output equals the desired output.