Keysight N9041B - Page 1991

3 Spectrum Analyzer Mode
3.13 Phase and Amplitude vs Time Measurement
whenever all the following are true:
–
The instrument is not in the Low Band, meaning:
–
the start frequency is above 3.5 GHz and
–
the stop frequency is above 3.6 GHz.
–
the internal preamp is not installed or if installed, is set to Off or Low Band
Note that this means that, when any part of a sweep is done in Low Band, the Low
Noise Path is not used, whether or not the Full Bypass Enable is selected in the user
interface. Also, if the preamp is turned on, the Low Noise Path is not used, whether
or not the Full Bypass Enable is selected in the user interface. The only time the Low
Noise Path is used is when Full Bypass Enable is selected, the sweep is completely
in High Band (> 3.6GHz) and no preamp is in use.
CAUTION
When Full Bypass Enable is selected, and "Y Scale" on page 1951 is set to
0dB, there will be a direct AC connection between the input and the first
converter when the Low Noise Path switches in (when Start Freq >3.6GHz and
the Preamp is either not licensed, set to Low Band, or Off). This puts the first
converter at considerable risk to be damaged by high AC power. Consequently,
whenever Full Bypass Enable is selected, a warning message appears in the
status bar:
“Full Bypass Enabled, maximum safe input power reduced”
Microwave Preselector Bypass Backwards Compatibility
Example Bypass the microwave preselector:
:POW:MW:PRES OFF
Notes Included for Microwave Preselector Bypass backwards compatibility
The ON parameter sets the STD path (:POW:MW:PATH STD)
The OFF parameter sets path MPB (:POW:MW:PATH MPB)
Preset
ON
Backwards
Compatibility
SCPI
[:SENSe]:POWer[:RF]:MW:PRESelector[:STATe] ON | OFF | 0 | 1
[:SENSe]:POWer[:RF]:MW:PRESelector[:STATe]?
Frequency Extender Preselection Bypass
Only applies to the high frequency path of the Frequency Extender, and only if the
Frequency Extender allows it. For example, the V3050A high frequency path is 50 –
110GHz and does allow control of the preselector bypass.
Spectrum Analyzer Mode User's &Programmer's Reference 1991