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Triggering on Waveforms
TDS 500C, TDS 600B, & TDS 700C User Manual
3–81
Trigger Class = State
Ch 1, 2, 3 Inputs = High, Don’t Care, Don’t Care
Ch 4 Input = Rising Edge
Logic = OR
Figure 3–41: Logic Trigger Readouts — State Class Selected
NOTE. When the trigger type Logic is selected, the trigger levels must be set for
each channel individually in the Set Thresholds menu (pattern and state classes)
or the Levels (setup/hold class) menu. Therefore, the Trigger Level readout will
disappear on the display and the Trigger Level knob can be used to set the
selected level while the Main Trigger menu is set to Logic.
When you select the logic class Pattern, the oscilloscope will trigger on a
specified logic combination of the four input channels. (Pages 3–76 through
3–78 describe how pattern triggers work.) To use pattern triggering, do the
procedures that follow:
Select Pattern Triggering. Press TRIGGER MENU ➞ Type (main) ➞ Logic
(pop-up) ➞ Class (main) ➞ Pattern (pop-up).
To Trigger on a Pattern