Pulse Triggering
3–94
TDS 420A, TDS 430A, TDS 460A & TDS 510A User Manual
Runt Operation
When you select the pulse class Runt, the oscilloscope will trigger on a short
pulse that crosses one threshold but fails to cross a second threshold before
recrossing the first. To set up runt triggering:
1. Press TRIGGER MENU
➞ Type (main) ➞ Pulse (pop-up) ➞
Class
(main) ➞ Runt (pop-up) ➞ Source (main) ➞ Ch1, Ch2, Ch3, or Ch4
(side). (See Figure 3–50.)
2. Press Polarity
(main) ➞ Positive, Negative, or Either (side).
3. Press Thresholds
(main), and set the upper and lower thresholds for runt
detection with the side menu selections and the keypad or the general
purpose knob.
To specify the direction of the runt pulse:
Press TRIGGER MENU
➞ Type (main) ➞ Pulse (pop-up) ➞ Class (main) ➞
Runt
(pop-up) ➞ Polarity (main) ➞ Positive, Negative, or Either (side).
Positive looks for positive-going runt pulses.
Negative looks for negative-going runt pulses.
Either looks for both positive and negative runt pulses.
Polarity
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