Other Considerations - National Instruments DAQ PCI E Series User Manual

Other Considerations

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than the board itself. For example, to calibrate a 16-bit board, the
external reference should be at least ±0.001% (±10 ppm) accurate.
The CalDACs adjust the gain error of each analog output channel by
adjusting the value of the reference voltage supplied to that channel.
This calibration mechanism is designed to work only with the internal
10 V reference. Thus, in general, it is not possible to calibrate the analog
output gain error when using an external reference. In this case, it is
advisable to account for the nominal gain error of the analog output
channel either in software or with external hardware. See Appendix A,
Specifications, for analog output gain error information.
5-3
Chapter 5 Calibration
PCI E Series User Manual