Holdoff (Playback Trigger)
can be set for these playback trigger styles:
Playback trigger has the following minor differences from hardware-based trigger holdoff:
- can be used for I+jQ measurements in playback mode.
- The input data for playback has been digitally filtered, eliminating much of the high-frequency noise.
Playback trigger behavior is defined by the Holdoff style selected:
-
Below Level - (default) Playback trigger specifies an amount of time that the signal must be a stable low value (below the trigger level) before the next trigger can occur.
- Time T1 is less than the holdoff time (H). The signal is not recognized as being low and there is no trigger.
- Time T2 is longer than the holdoff time (H). After the holdoff time, triggering occurs at the negative trigger point for a negative slope and the positive trigger point for a positive slope.
- When the trigger input signal goes low again, the holdoff starts. Time T3 is less than the holdoff time (H). The signal is not recognized as being low and there is no trigger.
- Time T4 is longer than holdoff time (H), so triggering will occur on the next negative or positive trigger point depending on the specified slope.
-
Above Level - Playback trigger specifies an amount of time that the signal must be a stable high value (above the trigger level) before the next trigger can occur.
- Time T1 is less than the holdoff time (H). The signal is not recognized as being low and there is no trigger
-
Time T2 is longer than the holdoff time (H). After the holdoff time has elapsed, triggering occurs at the negative trigger point for a negative slope and the positive trigger point for a positive slope.
- When the trigger input signal goes high again, the holdoff starts. Time T3 is less than the holdoff time (H). The signal is not recognized as being low and there is no trigger.
- Time T4 is longer than holdoff time (H), so triggering will occur on the next negative or positive trigger point depending on the specified slope.
Trigger can be entered in seconds, milliseconds, microseconds, or nanoseconds. A negative holdoff cannot be entered.
Playback Trigger parameters (including this one) affect the outcome of the time record when making a measurement.
See Also
Hold-off Style (Playback Trigger)
