3 Spectrum Analyzer Mode
3.2 Swept SA Measurement
Example
:IF:GAIN:FFT:AUTO ON
Preset
ON
Auto
Allows the instrument to pick the FFT IF Gain method as appropriate. When in Auto,
the FFT IF Gain is set as follows:
–
When the Sweep Type Rules are set to “Best Speed,” the instrument selects LOW
Gain as the auto choice
–
When the Sweep Type Rules are set to “Best Dynamic Range”, the instrument
selects AUTOrange as the auto choice
Auto is selected when "Auto Couple" on page 2017 is pressed.
Autorange (Slower: Follows Signals)
Turns the ADC ranging to automatic, which provides the best signal to noise ratio.
AUTOrange is usually preferred over the manual range choices.
NOTE
In N9041B, when the Software Preselection switch in the Amplitude, Signal
Path menu is ON, and RF Input 2 is selected, Autorange always selects high
gain. This provides the best signal-to-noise ratio, at the risk of overloading in the
presence of stronger signals. If you experience overloads with Software
Preselection set to ON, set FFT IF Gain to Low manually.
Example
:IF:GAIN:FFT AUTOrange
Low Gain (Best for Large Signals)
Forces FFT IF Gain to be LOW.
Example
:IF:GAIN:FFT LOW
High Gain (Best Noise Level)
Forces FFT IF Gain to be HIGH.
Example
:IF:GAIN:FFT HIGH
Noise Floor Extension
Lets you configure Noise Floor Extension (NFE). All Modes that support NFE let you
set it on or off. Additionally, some Modes support two “on” states for NFE, Full and
Adaptive, as described below.
Spectrum Analyzer Mode User's &Programmer's Reference 443
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