Ceyear 4051 Series, User Manual

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5 Menu
5.2. Description of menu
466
:obwidth:bandwidth:video 1 kHz
:obwidth:bandwidth:video:AUTO ON
[Filter Type ▶ ]
●
More description: comprising [Gaussian] and [Flattop]. In general, the signal/spectrum uses Gaussian
filter, i.e., use filter approximate to the Gaussian shape to complete filtering of Res BW. If the flat top
filter is used, the signal/spectrum analyzer adopts filter approximate to the rectangular shape to complete
filtering of resolution bandwidth. The response time of flat top filter is about 3 times of that of the
Gaussian filter. The sweep speed of the flat top filter is smaller than that of the Gaussian filter. The flat
top filter has better selectivity than the Gaussian filter and therefore is more capable of distinguishing two
signals with unequal amplitude.
● Key path: 【 BW 】 , [Filter Type ▶ ] on the front panel.
● Status saved: saved in the instrument status.
● Factory preset: Gaussian.
● Remote Command:
: obwidth:bandwidth:shape gaussian|flattop
: obwidth:bandwidth:shape?
5.2.4.5 Auto Setting
Pop up the soft menu related to auto setting including [Couple All], [Mech Atten Auto Man], [Res BW Auto
Man], [Video BW Auto Man], [VBW/RBW Auto Man], [Span/RBW Auto Man], [Sweep Time Auto Man]
and [CF Step Auto Man].
[Couple All]
● Menu description: to set the resolution bandwidth, video bandwidth, sweep time, mechanical attenuator
and frequency step as auto coupling mode. The signal/spectrum analyzer will select most suitable values
for those functions based on set frequency and bandwidth (or start frequency and stop frequency). If no
ratio is pre-saved, use default ratio.
● Key path:
【
Auto Set
】
, [Couple All] on the front panel.
● Status saved: not saved in instrument status.
● Factory preset: Couple All.
●
Remote Command:
:couple ALL
●
Examples:
:COUP ALL
[Mech Atten Auto Man]
See [Attenuation ▶ ] under [
Ampld/YScale
Ampld/Y Scale] for more details.
[Res BW Auto Man]
See [Res BW Auto Man] under
【
BW
】
for more details.