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3 Spectrum Analyzer Mode

3.2 Swept SA Measurement

RBW Filter Type

Selects the type for the resolution bandwidth filters. In the X-Series, the RBW Filter

BW menu lets you choose between a Gaussian and Flat Top filter shape, for varying

measurement conditions.

Filter Type SCPI Example

Gaussian :BAND:SHAP GAUS

Flattop :BAND:SHAP FLAT

See "More Information" on page 254

Remote Command

[:SENSe]:BANDwidth|BWIDth:SHAPe GAUSsian | FLATtop

[:SENSe]:BANDwidth|BWIDth:SHAPe?

Example

:BAND:SHAP GAUS

:BAND:SHAP?

Notes GAUSsian= Gaussian

FLATtop = Flattop

Dependencies In the Swept SA measurement, the RBW Filter Type control is grayed-out if the EMC Standard is set to

CISPR or MIL. In this case the Filter Type is always Gaussian; the Filter BW is chosen as appropriate

for the filter and the standard. Any attempt to set it to Flattop will give an error

Preset "Auto Couple" on page 2017 selects the preset value

State Saved Saved in instrument state

Annotation The annotation under RBW in the bottom left of the screen shows the type of filter or bandwidth that is

being used. The following examples illustrate this:

–3 dB (Normal) filter BW Res BW 300 Hz

–6 dB filter BW Res BW (–6 dB) 422 Hz

Noise filter BW Res BW (Noise) 317 Hz

Impulse filter BW Res BW (Impulse) 444 Hz

CISPR filter BW Res BW (CISPR) 200 Hz

MIL filter BW Res BW (MIL) 1 kHz

Flattop filter type Res BW (Flattop) 300 Hz

More Information

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’ Gaussian filters are chosen to come as close as possible, within the

254 Spectrum Analyzer Mode User's &Programmer's Reference

Keysight x-series User Manual

Other manuals for Keysight x-series