National Instruments Isolated Analog Input Device NI PXI-4224 - Manual (Page 70)

Appendix D Common Questions
NI PXI-4224 User Manual D-2 ni.com
How do I perform an external calibration of the NI PXI-4224?
As of the NI PXI-4224 release, an external calibration document is not
available. To check the availability of an NI PXI-4224 external calibration
document is go to
ni.com/calibration and click Manual Calibration
Procedures.