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2-3-7 Delayed-timt,
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Operation
The Model 7040A contains two timebases, arranged so one (the A timebase) may
provide a delay between a trigger event and the beginning of sweep by the
second (B) time base. This allows any selected portion of a waveform, or one
pulse of a pulse train, to be spread over the entire CRT screen. Delayed sweep
can be used with either single-trace or dual-trace operation. The procedure is
the same regardless of the number of traces displayed.
Basic Delayed Sweep. For delayed sweep, proceed as follows
1. Set up the instrument for whatever vertical mode you desire.
2. Make sure the B TRIG'D pushbutton (23) is out.
3. Press the A INT HORIZ DISPLAY pushbutton (23). A section of the trace(s)
will brighten.
NOTE The intensified portion will
be quite small if there is a large
difference between the setting of
the A and B TIME/DIY switches.
4. Turn the B TIME/DIY switch (25) until the intensified portion of the trace
widens to an amount equal to the portion of the trace you wish to magnify
(see Figure 2-6b).
5. Turn the DELAY TIME POS control (26) to position the intensification over the
portion of the trace you wish to magnify.
6. Press the B HORIZ DISPLAY pushbutton (23). That portion of the trace inten
sified in Step 5 now appears spread over the full width of the CRT screen.
The trace now displayed is being swept by the B timebase (Figure 2-6c).
7.
If
needed, additional enlargement is possible by pulling the A VARIABLE
knob (27) for PULL X 10 MAG.
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