Keysight N9000B - Page 257

3 Spectrum Analyzer Mode
3.2 Swept SA Measurement
3.
The equivalent Noise bandwidth of the filter, which is defined as the bandwidth
of a rectangular filter with the same peak gain which would pass the same power
for noise signals
4.
The equivalent Impulse bandwidth of the filter, which is defined as the
bandwidth of a rectangular filter with the same peak gain which would pass the
same power for impulsive (narrow pulsed) signals
The following figure shows the relationships of the various filter bandwidths for
filters with the X-Series’ shape factor (shape factor is defined as the ratio of the –
60dB bandwidth to the – 3dB bandwidth):
The Filter Type menu lets you choose the filter bandwidth (–3dB, –6dB, Noise or
Impulse) that is used when specifying the width of the filter. Note that for a given
Gaussian filter, changing the filter bandwidth specification does not affect the filter
width at all but only the means of specifying it. For example, the filter whose –3dB
Spectrum Analyzer Mode User's &Programmer's Reference 257