Agilent Technologies Signal Analyzer N9030a - Manual (Page 551)

6 RLC Swept SA Measurement Front-Panel & SCPI Reference
BW
More Information
When the Res BW is manually selected, it may be returned to the coupled state by pressing the Res
BW
key until Auto is underlined. This may also be done by pressing Auto Couple or by performing
a Preset.
When Res BW is set to Auto, the bandwidth selected depends on the Filter Type (see “Filter Type”
below).
Only certain discrete resolution bandwidths are available. The available bandwidths are
dependent on the Filter Type or the EMC Standard. If an unavailable bandwidth is entered with the
numeric keypad, the closest available bandwidth is selected.
The zero-span case deserves some mention, because RBW is coupled to Span when in a swept
(non-zero) span and in zero span there is normally no meaningful RBW coupling in Zero Span.
However, when a MIL or CISPR EMC Standard is selected, there IS a meaningful coupling for RBW
in Zero Span – in fact, it is coupled to Center Frequency, in order to make measurements
according to the EMI specifications.
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
Video BW
Lets you change the analyzer post-detection filter (VBW or “video bandwidth”) from 1 Hz to 8
MHz in approximately 10% steps. In addition, a wide-open video filter bandwidth may be chosen
by selecting 50 MHz. The VBW is annotated at the bottom of the display, in the center.
Remote Language Compatibility Measurement Application Reference 551