Lo Control - Keysight N8973B Service Manual

Service and Diagnostics Menus
Service Key Descriptions

LO Control

Provides keys that allow you to control the LO. This is only present on analyzers
equipped with Opt EXM, External Mixing.
2nd LO Gain DAC
This parameter provides the ability to adjust the output gain of the 2nd LO
DAC. The range is from 0 to 4095 where 0 is the minimum gain and 4095 is the
maximum gain. Setting a value of 4096 or greater returns control to the
instrument. In External Mixing, this DAC controls the level of the 1st LO signal
at the front panel EXT MIXER connector.
External LO Turnoff
Disconnects the 1st LO path which will minimize the effect of the 1st LO signal
at the front panel EXT MIXER connector.
348 Keysight NFA Series Noise Figure Analyzers Service Guide