Fluke 91 Series II User Manual page 141

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To see the block of four pulses in detail, increase the time
base and use pretrigger delay:
7. Press to increase the time base to 2ms/DIV.
8. Press .
9. Use to highlight "time delay", and press
to select.
10. Use to adjust the time delay to -7 divisions
(refer to Figure 8-8).
Adjusting the time delay to -7 divisions has moved the
trigger point to the seventh division on the display, and you
now see seven divisions of information that occur before
the trigger. (See Figure 8-8.) You can use Zoom to look at
the falling edge detail of the 50% pulse. The Zoom function
expands the trace referenced to the fourth time division
and automatically adjusts the delay.
11. Press .
12. Use to highlight "scope zoom", and press
to select.
13. Use to zoom in the waveform.
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Figure 8-8 Time Delay -7 Divisions
Users Manual