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Performance Tests
4–54
TDS 684A, TDS 744A, & TDS 784A Service Manual
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 TRIGGER MENU; then press the main-menu button Slope.
H Press SET LEVEL TO 50%. Adjust the TRIGGER LEVEL knob
so that the TRIG’D light is on. Set the level to near the middle of
the range where the TRIG’D light is on. CHECK that the trigger is
stable for the test waveform on both the positive and negative slopes.
Use the side menu to switch between trigger slopes.
H Enter pass/fail result for main trigger on the test record.
H Leave the Main trigger system triggered on the positive slope of the
waveform before continuing to the next step.
Check if stable trigger.
Figure 4–18: Measurement of Trigger Sensitivity — 50 MHz Results Shown on a TDS
684A Screen