Triggering on Waveforms
3–84
TDS 500B, TDS 600B, & TDS 700A User Manual
Select the Polarity. Press TRIGGER MENU ➞ Type (main) ➞ Pulse
(pop-up) ➞ Class (main) ➞ Timeout (pop-up) ➞ Polarity (main) ➞ Stays
High, Stays Low, or Either (side).
Stays High causes a trigger to occur if the signal stays higher than the
trigger level for longer than the timeout value.
Stays Low causes a trigger to occur if the signal stays lower than the trigger
level for longer than the timeout value.
Either causes a trigger to occur if the signal stays lower or stays higher than
the trigger level for longer than the timeout value.
Time. To set the timeout time:
1. Press TRIGGER MENU ➞ Type (main) ➞ Pulse (pop-up) ➞
Class (main) ➞ Timeout (pop-up) ➞ Time (main)
2. Turn the general purpose knob or use the keypad to set values for the timeout
time.
Set the Level . Press TRIGGER MENU ➞ Type (main) ➞ Pulse (pop-up) ➞
Class (main) ➞ Timeout (pop-up) ➞ Level (main) ➞ Level, Set to TTL, Set to
ECL, or Set to 50% (side).
If you select Level, you set the trigger level by entering a value with the
general purpose knob or the keypad.
If you select Set to TTL, the oscilloscope sets the trigger level to the TTL
switching threshold.
If you select Set to ECL, the oscilloscope sets the trigger level to the ECL
switching threshold.
If you select Set to 50%, the oscilloscope searches for the point halfway
between the peaks of the trigger source signal and sets the trigger level to
that point.
Set the Mode and Holdoff. Mode and holdoff can be set for all standard trigger
types and classes. To set mode and holdoff, refer to Set Mode & Holdoff on
page 3–61. To learn more about trigger mode and holdoff, see Trigger Modes
and Trigger Holdoff on page 3–53.
Delayed Triggering
The TDS Oscilloscope provides a main time base and a delayed time base. The
delayed time base, like the main time base, requires a trigger signal and an input
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