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V I D E O B A N D W I D T H
Example
Signal responses near the noise level of the analyzer will be visually masked by the noise. The video filter can be
narrowed to smooth this noise.
A low level signal at this center frequency can just be
discerned from the noise.
Narrowing the video bandwidth clarifies the signal and
allows its amplitude measurement.
P r e s s m @I @I @l @I
The sweep time will increase to maintain amplitude calibration.
The video bandwidth must be set wider or equal to the resolution bandwidth when
measuring pulsed RF or impulse noise levels.
Video Averaging
Narrowing the video filter requires a slower sweep time to keep amplitude calibration, since the narrower filter must
have sufficient time to respond to each signal response. Video averaging is an internal routine which djgjtalfy
averages a number of sweeps, allowing a more instantaneous display of spectra1 changes due to center frequency,
frequency span, or reference level changes. See Chapter 11.
72 Manual Operation
NOTE
C O U P L E D F U N C T I O N
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