The Dpac Board was part of the Trillium Tester added on test  devises with a "Analogue to Digital convertor " 

 It uses four  tester channels  to control the D2A the idea being that you can ramp a voltage at a higher  speed

than if you were to ramp using the testers levels command. 

I was asked to move the maintenance from weekly to monthly.

I gathered calibration data and saw no change over time of the Raw calibration.

I aslo noted that the Dpac had a 16bit resolution on the analogue output and the P629 chips only had a 10bit A2D converter.

I wrote the white paper and moved the maintenance from weekly to monthly 4 hours of Down time  was saved per week on

16 testers.A quater of a hour her tester per week.