Dear John,
Thanks for using the Developer Exchange.
There is no self calibration function for the DMM because it is a extremely precise device (24 bits of resolution). So in order to calibrate the 4060 will have to use an extremely precise external voltage source. Only Calibrators instruments can source this kind of voltage. If you want to calibrate your DMM you have two options:
1 - Send the board back to NI once a year
2 - Use the Calibration Executive to perform in-house high precision calibration.
You can find more information about the Calibration Executive in the following web page: www.ni.com/support/calibrat/autocal.htm
Best Regards
Omar De Andrade
Applications Engineer - Computer Based Instruments
http://www.ni.com/support/