When you self-calibrate your S Series device, no signal connections are necessary. However, values generated on the analog output channels change during the calibration process. If you have external circuitry connected to the analog output channels that is sensitive to these changes, you should disconnect the circuitry before beginning self-calibration.
When externally calibrating your S Series device, connect the signals as described below. Set the reference voltage between 6.000 V and 9.998 V (2.500 V and 4.998 V for the NI PCI/PXI 6143). Typically, you should use a calibrator or other stable voltage source for calibration. Do not use a power supply as its signals are not very stable.
For external calibration, make the following signal connections: