Tektronix TLS 216 User Manual page 251

Set Mode & Holdoff
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TLS 216 User Manual
the source, use the general purpose knob or keypad to select from channels 1
through 16. The channel selected appears in the Source menu item.
2. Press Polarity (side). Press again to toggle between rising-edge and
falling-edge polarity.
3. Press Threshold (side). Use the general purpose knob or the keypad to set
the threshold level for the clock input.
NOTE. No matter how you set the clock source in the Define Pattern menu (to
HIGH, LOW, or Don't Care), the logic scope ignores the clock source when
evaluating whether a pattern is TRUE. The clock source only determines when
the logic scope evaluates the pattern.
Figure 3-75 on page 3–167 shows state triggering on a three waveform pattern
(bottom three waveforms) at the time the clock changes state going positive (top
waveform).
To change trigger mode or holdoff time (main trigger system only), do the
following steps.
1. Press TRIGGER MENU
Holdoff (main) Auto or Normal (side).
In Auto mode the logic scope acquires a waveform after a specific time has
elapsed even if a trigger does not occur. The amount of time the logic scope
waits depends on the time base setting.
In Normal mode the logic scope acquires a waveform only if there is a valid
trigger.
2. Press Holdoff (side). Enter the value in percent using the general purpose
knob or the keypad.
See Triggering, on page 2–13.
See Triggering on Signals, on page 3–159.
Type (main) State (pop-up)
Triggering on States
Mode &
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