Logic Triggering
TDS 420A, TDS 430A, TDS 460A & TDS 510A User Manual
3–69
When triggering on a pattern, the oscilloscope samples the inputs from all the
channels. The oscilloscope then triggers if the conditions defined in Table 3–4
and the Trigger When menu are met. (The other settings in that menu are
described in Define a Time Qualified Pattern Trigger on page 3–71.)
When triggering on a state, the oscilloscope waits until the edge of channel 4
transitions in the specified direction. At that point, the oscilloscope samples the
inputs from the other channels and triggers if the conditions defined in Table 3–4
and the Trigger When menu are met.
Operations Common to Pattern and State
To select when to trigger (true or false), set the thresholds for each channel,
select the mode (auto or normal), and adjust the holdoff.
Press TRIGGER MENU
➞ Type (main) ➞ Logic (pop-up) ➞ Class (main) ➞
Pattern or State (pop-up).
To trigger when the logic condition is met (Goes TRUE) or when the logic
condition is not met (Goes FALSE):
Press TRIGGER MENU
➞ Type (main) ➞ Logic (pop-up) ➞ Class (main) ➞
Pattern or State (pop-up)
➞ Trigger When (main) ➞ Goes TRUE or Goes
FALSE
(side).
To set the logic threshold for each channel:
1. Press TRIGGER MENU
➞ Type (main) ➞ Logic (pop-up) ➞
Class
(main) ➞ Pattern or State (pop-up) ➞ Set Thresholds (main) ➞
Ch1, Ch2, Ch3, or Ch4
(side).
2. Use the MAIN TRIGGER LEVEL knob, the general purpose knob, or the
keypad to set each threshold.
Trigger When
Set Thresholds
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