Pan/Zoom - Tektronix 11801C User Manual

Pan/Zoom

11801C User Manual
Pan/Zoom allows you to magnify any portion of the selected trace to ex
amine it more closely. You can magnify (zoom) the selected trace to the
point where each digitized sample appears on the display, and you can
move the magnified trace left and right (pan) to examine any part of the
trace.
The maximum magnification is determined by the trace record length, which
is described in the Record Length section, page 3 161. The trace display
area is 512 pixels wide, so you can magnify a 5120 point trace up to 10
times. A 512 point trace already displays only one digitized sample per pixel
and cannot be magnified.
Pan/Zoom does not change the way trace data is sampled and
recorded. It only changes the way the trace data is displayed.
Whenever the icon is highlighted, the lower right corner of the display
shows the Pan/Zoom selector. Normally, Pan/Zoom is off, and the knobs
are assigned to horizontal size and position. When you touch the Pan/Zoom
selector to set it on, the knobs are assigned to Horz Mag (Zoom) and Horz
Pos Gr (Pan).
You use the top knob, Horz Mag, to specify how much magnification you
want on the selected trace. You use the bottom knob, Horz Pos Gr, to
position the segment of the trace that you want to view onto the display. The
knob label status area shows how many trace data points are not shown
because they are off the left end of the screen. When you set Horz Pos Gr
to zero, you display the leftmost portion of the trace.
You can use horizontal magnification to see the exact data points of a trace
record. Set horizontal magnification to the maximum and turn off trace
vectoring. Trace Vectoring is discussed in the Vectored Traces section, page
3 219. The display will show each sampled data point of the trace. See
Figure 3 52.
Horizontal Controls
NOTE
3 107