Keysight N9912A - Power Meter Mode

Keysight N9912A Service Guide 5-25
Theory of Operation
Operation in Modes
Power Meter Mode
All measurement circuitry is switched to the low power state during PM (power
meter) mode. This is the mode with the lowest power dissipation.
The analyzer has no power output capability in this mode. The analyzer
essentially functions as a display for a USB power sensor.