Keysight N9912A User Manual page 29

6. Connect the DUT and view the insertion loss measurement results.
When measuring very long lengths of cable, it may be necessary to increase the
sweep time. Learn how on page 25. Learn why in the Supplemental Online Help:
http://na.support.keysight.com/fieldfox/help/FieldFox.htm
CAT (Cable and Antenna Test) Mode 29