Measurement Computing PCM-DAC08 - Manual (Page 17)

6 CALIBRATION
The PCM-DAC08 is software calibrated and tested at the factory. All calibration after
initial manufacturing is done via software. The calibration factors are stored on the
PCM-DAC08 and applied every time the board is run. The case may not be opened
and there are no parts inside which you can service. There are no socketed
components.
6.1 SOFTWARE CALIBRATION
If you are using the UniversalLibrary, you can set software calibration factors for off-
set and gain using the Calibration option of InstaCal. These factors will be applied to
outputs made by any of the D/A routines called from any of the language libraries of
UniversalLibrary.
You will need a precision voltage source of better than 1/4095 resolution and that
voltage source must be calibrated.
It is important to note that once calibration factors have been set, they are stored in the
PCM-DAC08. These calibration factors are accessed by UniversalLibrary and Insta-
Cal and applied to any output codes sent to the PCM-DAC08. If you use direct regis-
ter programming be sure to access and apply the calibration factors. Of course, the
calibration factors may be reset at any time by runing InstaCal calibration.
Choose Calibration from the InstaCal menu, and follow the instructions. Press F1 for
help.
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