Logic Triggering
TDS 620A, 640A, & 644A User Manual
3Ć81
Figure 3-43: Logic Trigger Menu
Trigger When
This menu item lets you determine if the oscilloscope will trigger when the
logic condition is met (Goes TRUE) or when the logic condition is not met
(Goes FALSE). (The True when less than and True when greater than
menu items are only used for pattern logic triggering and are covered on
page 3-83.)
Press TRIGGER MENU ➞ Type (main) ➞ Logic (pop-up) ➞ Class (main) ➞
Pattern or State (pop-up) ➞ Trigger When (main) ➞ Goes TRUE or Goes
FALSE (side).
Set Thresholds
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 (Ax1 on the TDS 620A & TDS 524A), or Ch4 (Ax2 on the
TDS 620A & TDS 524A) (side).
2. Use the MAIN TRIGGER LEVEL knob, the general purpose knob, or the
keypad to set each threshold.
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