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Gaussian filters
When the Gaussian filter type is chosen, a set of 160 RBW filters are available whose shape is
approximately Gaussian. The actual bandwidths used to realize the X-Series’s Gaussian filters are
chosen to come as close as possible to a 24 step per decade series, within the limitations of the digital IF.
For Gaussian filters, the annotation at the bottom of the screen shows the filter bandwidth type (unless it
is Normal). This is shown parenthetically between the words “Res BW” and the value, for example
Res BW 10.0 Hz (Normal bandwidth)
Res BW (Impulse) 14.8 Hz (Impulse bandwidth)
Flattop filters
When the Flattop filter type is chosen, a new set of 134 RBW hardware settings are available. These
settings realize filters that are approximately rectangular in shape. When this shape is chosen the filter
bandwidth options are irrelevant and therefore unavailable.
The annotation at the bottom of the screen will show that the Flattop shape is being used, for example:
Res BW (Flattop) 10 Hz
Gaussian
Selects the Gaussian filter type. There are 160 of these RBWs. They are arranged in a 24-per-decade
sequence from 1 Hz through 3 MHz, plus the 4, 5, 6 and 8 MHz settings.
Flattop
Selects the flat top filter type
State Saved Saved in State
Readback line 1-of-N selection
Initial S/W Revision Prior to A.02.00
Modified at S/W Revision A.02.00
Key Path
BW, RBW Control, Filter Type
Example BAND:SHAP GAUS
Notes Parameter is GAUSsian. See remote command in section “Filter Type” on
page 895.
Readback Gaussian
Initial S/W Revision Prior to A.02.00
Key Path
BW, RBW Control, Filter Type
Example BAND:SHAP FLAT