Keysight Technologies N9040B UXA Signal Analyzer Service Guide 279
Service and Diagnostics Menus
Service Key Descriptions
Low Noise Path
Provides the ability to lock the Option (LNP) Low Noise Path switch that is used
in the μWave Path Control menu into the ON position, regardless of the state of
the μWave Path Control menu or functions. The low noise path flatness
corrections are applied.
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.
In normal operation the Low Noise Path and the Microwave Preselector Bypass (Option MPB)
cannot be turned on at the same time. This is done to protect the highband mixer from excessive
power.
Assure the mixer power is < −10 dBm
(mixer power = input power - input attenuation)
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