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5Key Reference
90 N9340A User’s Guide
As the video bandwidth is decreased, the sweep
time is increased to maintain amplitude calibration.
A “#”mark appears next to RBW on the display
when it is not coupled.
Key access: [BW/SWP]
VBW/RBW
Key access: [BW/SWP] > {VBW/RBW}
Selects the ratio between the video and resolution
bandwidths.
If signal responses near the noise level are visually
masked by the noise, the ratio can be set to less
than 1 to lower the noise. The knob and step keys
change the ratio in a 1, 3, 10 sequence.
Avg Type
Key access: [BW/SWP] > {Avg Type}
Accesses the functions to automatically or
manually choose from one of the following
averaging type:
Log Pwr
Key access: [BW/SWP] > {Avg Type} > {Log Pwr}
Averages the data as appropriate for the
logarithmic scaled
y- axis.
When the average type is set to Log Pwr, “LgAv
appears on the left side of the display.
NOTE
When preset is set to default, or VBW/RBW is set to Auto,
the ratio is set to 1.
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