Cat And Na Modes - Keysight N9912A Service Manual

Theory of Operation
Operation in Modes
There are two exceptions to this:
— the "Options (Licensing)" screen
— "Error Log" screen
When either of these screens is displayed, the firmware is in a special monitor
mode and measurements are suspended.

CAT and NA Modes

CAT and NA modes have some similar capabilities but are still separate
operating modes.
Measurement similarities:
— Return Loss = S11 magnitude
— Insertion Loss = S21 magnitude
Unlike S11 and S21, the values displayed below zero for Return Loss and
Insertion Loss are not negative.
Measurements are done at an effective IFBW (IF bandwidth) of 30 kHz except
when max for Interference Rejection measurements when it is at a 300 Hz
effective IFBW.
There is no user control of the output power level of the source synthesizer on
the A4 RF board.
The only user control of output power level is the high/low setting on the RF
Out Atten, 30 dB in or out.
Details About One Port Measurements
Refer to the block diagram below showing the signal paths highlighted in
color.
Keysight N9912A Service Guide 5-21