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Chapter 5
Calibration
©
National Instruments Corporation
5-3
6711/6713/6715 User Manual
To externally calibrate your device, be sure to use a very accurate external
reference. The reference should be several times more accurate than the
device itself. For example, to calibrate a 12-bit device, the external
reference should be at least ±0.0062% (±62 ppm) accurate.
Note
National Instruments recommends using a +5 V external reference voltage when
performing calibration.
Other Considerations
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.
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