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Pulse Triggering
TDS 620A, 640A, & 644A User Manual
The pulse trigger menus let you define the pulse source, select the mode
(auto or normal), and adjust the holdoff. To bring up the Pulse Trigger menu:
Press TRIGGER MENU ➞ Type (main) ➞ Pulse (pop-up) ➞ Class (main) ➞
Glitch, Runt, or Width (pop-up) (see Figure 3-62).
Figure 3-62: Main Trigger Menu — Glitch Class
Source
Use this main menu item to specify which channel becomes the pulse trigger
source.
Press TRIGGER MENU ➞ Type (main) ➞ Pulse (pop-up) ➞
Source (main) ➞ Ch1, Ch2, Ch3 (Ax1 on the TDS 620A & 524A), or Ch4
(Ax2 on the TDS 620A & 524A) (side).
Mode & Holdoff
To change the holdoff time and select the trigger mode:
1. Press TRIGGER MENU ➞ Type (main) ➞ Pulse (pop-up) ➞ Mode and
Holdoff (main) ➞ Auto or Normal (side).
In Auto mode the oscilloscope acquires a waveform after a specific
time has elapsed even if a trigger does not occur. The amount of time
the oscilloscope waits depends on the time base setting.
Operations Common
to Glitch, Runt, and
Width