Two Port Calibration; Quickcal - Keysight N9912A Service Manual

Theory of Operation
User Calibration in CAT and NA Modes
The preset calibration should be re-characterized every 12 months to maintain
accuracy. This is accomplished via the Error Terms test/adjustment in the TME.
Refer to
Under ideal conditions, a preset calibration and an OSL (open, short, load)
calibration should give very similar results for measurements at the RF OUT
port.

Two Port Calibration

Two port calibration applies only when S21 or Insertion Loss measurements are
active.
There is no "built-in" or "preset" two port calibration in the analyzer. A
normalize calibration must be performed before making two port
measurements.

QuickCal

The QuickCal function mathematically "extends" the preset calibration to the
end of a cable or adapter. It is a firmware only function; it does not involve
analyzer hardware.
5-28
Chapter 3.
Keysight N9912A Service Guide