Triggering on Waveforms
3–60 TDS 684A, TDS 744A, & TDS 784A User Manual
3. To change to the factory default holdoff setting for the current horizontal
scale setting, press Default Holdoff (side).
NOTE. If you select Default Holdoff, the default holdoff time will vary with the
horizontal scale setting to maintain a good value for general purpose triggering
at that scale. However, if you select Holdoff (as opposed to Default Holdoff), the
time set in the Holdoff menu item is used at all horizontal scale settings.
To select the slope that the edge trigger will occur on:
1. Press the TRIGGER MENU ➞ Type (main) ➞ Edge (pop-up) ➞
Slope (main).
2. Select the rising or falling edge from the side menu.
Press the TRIGGER MENU ➞ Type (main) ➞ Edge (pop-up) ➞
Level (main) ➞ Level, Set to TTL, Set to ECL, or Set to 50% (side).
Level lets you enter the trigger level using the general purpose knob or the
keypad.
Set to TTL fixes the trigger level at +1.4 V.
Set to ECL fixes the trigger level at –1.3 V.
NOTE. When you set the volts/div smaller than 200 mV, the oscilloscope reduces
the Set to TTL or Set to ECL trigger levels below standard TTL and ECL levels.
This reduction occurs because the trigger level range is fixed at ±12 divisions
from the center. At 100mV (the next smaller setting after 200 mV) the trigger
range is ±1.2 V, which is smaller than the typical TTL (+1.4V) or ECL (–1.3 V)
level.
Set to 50% fixes the trigger level to approximately 50% of the peak-to-peak
value of the trigger source signal.
Triggering Based on Logic
The TDS Oscilloscope can trigger on a logic or binary pattern and on the state of
a logic pattern at the time it is clocked. It can also trigger on data that violates

To Set Slope

To Set Level