Macro: TrigHold

Trigger Holdoff is the minimum non-trigger "dead time" before a trigger is accepted. The purpose of this is to allow triggering on the start of each burst in an input signal. Without this, any one of the cycles in a burst might be an acceptable trigger.

To use Holdoff, set it longer than one cycle of the carrier frequency (the tone that appears during a burst). This insures that no cycle during a burst will be long enough to cause a trigger. (It also assumes that the dead time between the offset of one burst and the onset of the next is longer than one cycle of the carrier.)

The small button to the left of the Delay control above Holdoff toggles between 'Smpls' (samples) and 'sec' (seconds). You can enter or view in whichever units you choose, and switch back and forth at any time.

When Trigger is off (free-run), Holdoff may be used to control the overlap or gap between trace updates. In this case, it is the minimum time (or number of samples) between updates. If you are viewing unPaused file data, however, the Holdoff value is ignored when trigger is off. Instead, the display advances by the Read Step Size on every update.

Macro Notes:

The Smpls/sec state determines the units used when setting Trigger Holdoff, as well as Delay. SmplSec=sec sets the units to seconds, as does SmplSec=1. SmplSec=Smpl or SmplSec=0 sets Samples, and SmplSec=x toggles between the two.

TrigHold=100 sets Trigger Holdoff to 100 samples if the units are Samples, else 100 seconds.

Alternatively, TrigHold=>1 increments Holdoff by 1 sample and TrigHold=>-1 decrements by 1 sample. The step size is the same for seconds mode, but the display shows the equivalent seconds.

See also Trigger Toggle - Introduction, Trigger Control Dialog

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