Pulse Analyzer (Option 421)
2-10 Setting Bandwidth Parameters
Pulse Analyzer MG
PN: 10580-00451 Rev. A
2-19
Auto coupling VBW links the video bandwidth to the resolution bandwidth so that VBW varies in proportion to
RBW. If manual VBW coupling is selected, the VBW label at the bottom of the graph is prefixed with the “#”
symbol and video bandwidth is set independently of resolution bandwidth.
By default, the RBW/VBW ratio is set to 3 and can be changed as follows:
1.
Press BANDWIDTH on the main menu.
2.
Press
RBW/VBW
and enter the desired value.
The RBW range varies with instrument features. Refer to
and check your
technical data sheet for the bandwidth range of your instrument.
BANDWIDTH Menu
AUTO RBW:
When toggled on, the instrument selects the resolution bandwidth based
on the current span width. The ratio of span width to RBW can be specified using the
SPAN:RBW button. When toggled off (manual), the RBW label at the left edge of the
x-axis will be preceded by the “#” symbol.
RBW:
The current resolution bandwidth is displayed under the RBW button. Once auto
RBW is toggled off, the RBW can be changed using the keypad or the slider controls.
Bandwidth values increment in a 1:3:10 sequence, from 1 Hz to 3 Hz to 10 Hz or from
10 Hz to 30 Hz to 100 Hz, for example. Refer to your instrument technical data sheet for
the resolution bandwidth range.
AUTO VBW:
When toggled on, the instrument selects the video bandwidth based on the
resolution bandwidth. The ratio of video bandwidth to resolution bandwidth can be set
using the RBW:VBW button. When toggled off (manual), the VBW label at the left edge of
the X-axis will be preceded by the “#” symbol.
VBW:
The current video bandwidth is displayed under the VBW button. Once auto VBW
is toggled off, the VBW can be changed using the keypad or slider controls. Bandwidth
values increment in a 1:3:10 sequence, from 1 Hz to 3 Hz to 10 Hz or from 10 Hz to
30 Hz to 100 Hz, for example. Refer to your instrument technical data sheet for the video
bandwidth range.
VBW TYPE:
Toggles between linear averaging (arithmetic mean) and logarithmic
averaging (geometric mean).
RBW:VBW:
This parameter displays the ratio between resolution bandwidth and video
bandwidth. To change the ratio, press this button and use the keypad or the slider
controls.
SPAN:RBW:
Displays the ratio between the span and the resolution bandwidth. The
default value is 100, meaning that the span will be 100 times the resolution bandwidth. To
change the ratio, press this button and use the keypad or slider controls.
Figure 2-19.
BANDWIDTH Menu
Summary of Contents for Field Master Pro MS2090A
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