Making
Measurements-222
DSO
Operators
5.5
SINGLE SWEEP OPERATION
1.
Preset the instrument controls and obtain a baseline display.
NOTE
The critical part of single-sequence operation is set-
ting the trigger point to get a sweep on a random
event. Determine the characteristics of the signal that
you want to trigger the sweep so that you can set the
trigger control correctly. Determine the correct slope
to trigger on and set the Trigger
SLOPE
to match.
2.
Apply a test signal to the CHI input to use for setting the Trigger
LEVEL control. The test signal should be of the same amplitude and
general type (negative or positive pulse or sinusoidal) as the signal
you want to trigger on.
3.
Press AUTO SETUP to obtain a quick front-panel control setup for
the test signal. If the vertical or horizontal scaling result is not what
you want to view, adjust the VOLTSIDIV and SECIDIV controls as you
wish. You may also want to set the Vertical POSITION differently.
4.
Switch the Trigger MODE to NORM and the Trigger SOURCE to
CH 1. Then, adjust the Trigger LEVEL control carefully for a stable
display.
5.
Now switch the Trigger MODE to SSEQ and check that the sweep
triggers each time the button is pressed. If it does not, readjust
the Trigger LEVEL control slightly so that the sweep does trigger with
each press of the button.
6.
Disconnect the test signal from the oscilloscope and apply the
random signal to the input.
7.
Press the
button to initialize the trigger system for the SSEQ
acquisition. The TRIG'D indicator lights when the event triggers.
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