Logic Triggering
3–70
TDS 420A, TDS 430A, TDS 460A & TDS 510A User Manual
Figure 3–36: Logic Trigger Menu
To change the holdoff time and select the trigger mode using this menu item:
Press TRIGGER MENU
➞ Type (main) ➞ Logic (pop-up) ➞ Class (main) ➞
Pattern or State (pop-up)
➞ Mode & Holdoff (main) ➞ Auto or Normal
(side). See To Set Mode and Holdoff, on page 3–24, for more information.
Pattern Operations
When you select Pattern, the oscilloscope will trigger on a specified logic
combination of the four input channels. See page 3–69 for details on operations
common to both pattern and state triggers.
To set the logic state for each of the input channels (Ch1, Ch2, ...):
1. Press TRIGGER MENU
➞ Type (main) ➞ Logic (pop-up) ➞
Class
(main) ➞ Pattern (pop-up) ➞ Define Inputs (main) ➞ Ch1, Ch2,
Ch3, or Ch4
(side).
2. Repeatedly press each input selected in step 1 to choose either High (H),
Low (L), or Don’t Care (X) for each channel.
Mode & Holdoff
Define Inputs
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