VXI VT1422A - Manual (Page 479)

VT1529A/B Verification & Calibration 477 Appendix C
For each channel (each must be tested separately), enable internal shunt
calibration by sending the OUTP:SHUNt ON,(@<channel>) command.
Note: this turns off the shunt on the previous channel.
Send the MEAS:VOLT:UNStrained? (@<channel>) query to the
VT1422A. The expected return value is ~0.211 V on each channel.
Calibration
Calibration is performed via the VT1422A CAL:REMote? command. The
VT1422A will automatically calibrate the specified VT1529A/B using the
Remote Calibration signal from the VT1422A. This signal is calibrated via
the Adjustment Procedure described in Chapter 3 of the VT1415A and
VT1419A Service Manual.
No other calibration procedure is needed.