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Edge Triggering
TDS 620A, 640A & 644A User Manual
3Ć35
Mode & Holdoff
You can change the holdoff time and select the trigger mode using this
menu item. See Triggering on page 2Ć13 for more details.
1. Press the TRIGGER MENU ➞ Mode & Holdoff (main) ➞ Auto or NorĆ
mal (side).
H 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.
H In Normal mode the oscilloscope acquires a waveform only if there
is a valid trigger.
2. To change the holdoff time, press Holdoff (side). Enter the value in %
using the general purpose knob or the keypad.
If you want to enter a large number using the general purpose knob, press
the SHIFT button before turning the knob. When the light above the SHIFT
button is on and the display says Coarse Knobs in the upper right corner,
the general purpose knob speeds up significantly.
You can set holdoff from 0% (minimum holdoff available) to 100% (maximum
available). See Holdoff, Variable, Main Trigger in the TDS 620A, 640A, &
644A Performance Verification Manual, Section 2 on Specifications, Typical
Characteristics for typical minimum and maximum values.
Holdoff is automatically reset to 0% when you change the main time base
time/division setting. However, it is not reset if you change the delayed time
base time/division (that is, when the time base setting in the Horizontal
menu is Intensified or Delayed Only).
See Triggering, on page 2Ć13.
See Triggering, on page 3Ć132.
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