On an X Series device, you can either acquire a signal present on the I/O connector, or you can acquire a signal that is being generated from the internal calibration multiplexer. The channels available on this multiplexer are typically used for calibration purposes, but you can also sample them as you would a physical signal present on the I/O connector. To read from one of these internal channels on a X Series multiplexed sampling device, you must use the internal channel as the device's physical channel (for example, Dev1/_aignd_vs_aignd) when creating the virtual channel.

The following table describes all internal channels for X Series multiplexed sampling devices.