Measurement Computing PCI-DDA02/12 - Manual (Page 12)

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Chapter 4
Calibrating the PCI-DDA02/12
Self-calibrating
The PCI-DDA02/12 is shipped fully-calibrated from the factory. Calibration coefficients are stored in
nonvolatile RAM. When using the Universal Library, the calibration factors are read from nonvolatile RAM
and are automatically written to the calibration DACs each time you select a different DAC range.
Use InstaCal to recalibrate with respect to the factory-measured voltage standards. InstaCal calibrates each
channel at all six ranges. Each channel takes less than a minute to calibrate.
Calibration configuration
The PCI-DDA02/12 provides self-calibration of the analog source and measure systems. This eliminates the
need for external equipment and user adjustments. The analog output circuits are calibrated for both gain and
offset. Gain calibration of the analog output is performed via DAC reference adjustments. Offset adjustments
for the analog output is made in the output buffer section.
PCI-DDA02/12 calibration circuitry is shown in Figure 4.
Figure 4. Calibration block diagram