Performance Tests
CSA7404B, TDS7704B, TDS7404B, TDS7254B & TDS7154B Service Manual
4- 103
b. Check the Main trigger system for stable triggering at limits:
H Read the following definition: A stable trigger is one that is
consistent; that is, one that results in a uniform, regular display
triggered on the selected slope (positive or negative). This display
should not have its trigger point switching between opposite slopes,
nor should it roll across the screen. At horizontal scale settings of
2 ms/division and faster, TRIG’D will remain constantly lighted. It
will flash for slower settings.
H Press the Trigger Slope button to select the positive s lope.
H Adjust the Trigger LEVEL knob so that there is a stable trigger.
CHECK that the trigger is stable for the test waveform on the
positive slope.
H Press the Trigger Slope button to select the negative slope. Adjust
the Trigger LEVEL knob so that there is a stable trigger.
H CHECK that the trigger is stable for the test waveform on the
negative slope.
H Leave the trigger system triggered on the positive slope of the
waveform before continuing to the next step.
Check if stable
trigger.
Figure 4- 28: Measurement of trigger sensitivity - 50 MHz results shown
c. Check Delayed trigger system for stable triggering at limits: Do the
following subparts in the order listed.
H From the button bar touch Trig, select the AEventtab, and set the
Source to Line.
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