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OSCILLOSCOPE DELAYED SWEEP
Usual method: Sweep occurs at the end of the delay.
1.
Connect the external sync to time base B.
2.
Set
the horizontal display control to B intensified
by
A.
3. Turn the A time base stability-triggering level controls
fully clockwise.
4. Adjust the time base B stability-triggering control in the
normal manner for a trace.
5, Adjust the time base A time/cm control and the delay time
multiplier until the desired part of the waveform is intensi-
fied.
(Make certain time base B is greater than time base
A.)
6.
Set
the horizontal display control to A delayed by B to see
the intensified part of the waveform.
External
B
Trigger
Delay
&~~]
Lsweep
Begins
Occasionally, when the usual method is used, a jittery trace
or unstable waveform on the scope results.
In
these instances
another sync method may be used to stabilize the trace.
Jittery trace method: double sync is used.
The sweep occurs as a result of a time base A triggering pulse,
internal or external, after the time base B delay is completed.
1. Set up the scope as in the usual method.
2. Connect the second external trigger to the time base A trig-
ger input and, if external trigger is used, set the triggering
mode control to external;
if
not, set the triggering mode
control to internal.
3. Adjust the time base A stability-triggering level control
in the normal manner to obtain a trace.
External
B
Trigger
~
Delay
External A
Trigger _ _ _ _
_ [ l
-------+---o-r-m~re~r~na~l'
L
Sweep Begins
Time base A armed
96
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