B+K precision 2510B Series, User Manual, Page: 59 / 184

Trigger 59
5.5 Trigger Holdoff
Trigger holdoff can be used to stably trigger the complex waveforms (such as pulse series). Holdoff time
is the amount of time that the oscilloscope waits before re-arming the trigger circuitry. The oscilloscope
will not trigger until the holdoff time expires.
Use the holdoff to trigger repetitive waveforms with multiple edges (or other events) between waveform
repetitions. You can also use holdoff to trigger on the first edge of a burst when you know the minimum
time between bursts.
For example, to get a stable trigger on the repetitive pulse burst below, set the holdoff time to be >200
ns but <600 ns.
Figure 5.6 Trigger Holdoff Example
The correct holdoff setting is typically slightly less than one repetition of the waveform. Set the holdoff to
this time to generate a unique trigger point for a repetitive waveform. Only edge trigger and serial trigger
have holdoff option. The holdoff time of the oscilloscope is adjustable from 80ns to 1.5s.
To enable and configure trigger holdoff:
1. Press the softkey to toggle Holdoff .
2. When enabled, use the Universal Knob to adjust the Holdoff Time .
• Press the Universal Knob to display the numeric keypad.
• Holdoff time can be set from 80 ns to 1.5 s.
Adjusting the time scale and horizontal position will not affect the holdoff.