X-Stream Operator’s Manual
WM-OM-E Rev I 101
Holdoff by Time or Events
Holdoff is an additional condition of Edge trigger. It can be expressed either as a period of time or
an event count. Holdoff disables the trigger circuit for a given period of time or number of events
after the last trigger occurred. Events are the number of occasions on which the trigger condition is
met. The trigger will again occur when the holdoff has elapsed and the trigger's other conditions are
met.
Use holdoff to obtain a stable trigger for repetitive, composite waveforms. For example, if the
number or duration of sub-signals is known you can disable them by choosing an appropriate
holdoff value. Qualified triggers operate using conditions similar to holdoff.
Hold Off by Time
Sometimes you can achieve a stable display of complex, repetitive waveforms by placing a
condition on the time between each successive trigger event. This time would otherwise be limited
only by the input signal, the coupling, and the instrument's bandwidth. Select a positive or negative
slope, and a minimum time between triggers. The trigger is generated when the condition is met
after the selected holdoff time, counted from the last trigger. Any time between 2 ns and 20 s can be
selected. The delay is initialized and started on each trigger.
Edge Trigger with Holdoff by Time. The bold edges on the trigger source indicate that a positive slope has been
selected. The broken upward-pointing arrows indicate potential triggers, which would occur if other conditions are
met. The bold arrows indicate where the triggers actually occur when the holdoff time has been exceeded.
Hold Off by Events
Select a positive or negative slope and a number of events. An event is the number of times the
trigger condition is met after the last trigger. A trigger is generated when the condition is met after
this number, counted from the last trigger. The count is restarted on each trigger. For example, if
the event number is two, the trigger will occur on the third event. From one to 1,000,000,000 events
can be selected.
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