Scope and Multimeter Operations
Capturing Data
129
Using Zoom
The zoom function is only available in Review Mode, and can be an invaluable tool
when searching for events of interest within captured data. Zoom effectively gives
you the ability to change the magnification level of the signal sweep during data
review.
As zoom, allows you to change the magnification level of the signal sweep, this
allows you to compress or expand multiple screens of data to quickly find glitches,
or signal losses.
NOTE
Control icon function is normal when using zoom, with the following exception:
Forward 1 Frame / Back 1 Frame control icons - (press once) moves
multiple frames relative to set magnification level (e.g. 2X setting, moves 2
frames; 16X setting, moves 16 frames).
When the
Zoom
icon is selected (
) the display defaults to the
"Max" magnification level and a dropdown scroll menu will display.
Figure 9-48
Zoom Icon
The dropdown menu allows you to select the display magnification level from a
range of 1X to 256X. The "Max" (maximum) option displays all data captured on
one screen (
NOTE
It is important to remember that whatever sweep setting you used during data
capture is what the 1X zoom level will show.
The active zoom options (1X to 256X) that are selectable are dependent on the
amount of data stored in the buffer. Less data captured = less zoom options.
More data captured = more zoom options.
1.
Glitch(s)
2.
Zoom Cursor
3.
Zoom Magnification Level (Max shown)
Figure 9-49
“Max" Magnification Level - displays all captured data
When zoom levels of 2X and higher are selected, a Zoom cursor (vertical dashed
line) (
) displays onscreen. The cursor is used to quickly mark and
navigate to points of interest or glitch in a captured waveform.
NOTE
To quickly identify a glitch in a pattern, it may be easier to initially view the
waveform at a higher magnification level (e.g. 256X or "Max") to display the
entire captured waveform, find the area of interest and then lower the zoom
level to 8X or 2X to review that area in detail. See
.
The Zoom cursor can be used to mark the approximate position of a glitch and can
be manually dragged onscreen to the desired position. The new cursor position will
be centered on the screen when a lower magnification level is selected.
shows an example at 64X with the Zoom cursor positioned in the area
of a signal drop glitch.
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