3 Spectrum Analyzer Mode
3.7 Burst Power Measurement
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 (> 3.6GHz) and no preamp is in use.
CAUTION
When Full Bypass Enable is selected, and "Y Scale" on page 1951 is set to
0dB, there will be a direct AC connection between the input and the first
converter when the Low Noise Path switches in (when Start Freq >3.6GHz 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 –
110GHz and does allow control of the preselector bypass.
When the Frequency Extender’s preselection is bypassed, flatness is improved, but
will be subject to spurs from out-of-band interfering signals. For bandwidths greater
than 2.5[GHz], it is recommended that the signal bypass the Frequency Extender
Preselector since the max bandwidth of the Preselector can be as narrow as 2.5
[GHz].
For most applications, the preset state is OFF, which gives the best remote-control
throughput, minimizes acoustic noise from switching, minimizes out of band spurs,
and minimizes the risk of wear in the hardware switches.
1286 Spectrum Analyzer Mode User's &Programmer's Reference
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