Used to get the ID of the power source for a Transmission Response Calibration or the second source for an IM Spectrum Calibration. A source catalog is obtained from the PNA and the value of this key is used as the index into obtained catalog where 1 (one) is the first entry. This value is useful if an external RF source is configured within the PNA.

Calibrations of the following type are required to set this value.

if no value is provided then the value defaults to 5

if no value is provided then the value defaults to the PowerSensorPort

This key corresponds with the PNA SCPI command "SOURce<cnum>:CATalog?" parameter as explained in this Keysight Documentation

For more information on specifying  a source see: Specifying a source port

The source ID will the the index (1 based) into this catalog.

An Example:

TBD