MATLAB XPC TARGET RELEASE NOTES Guía de usuario descargar pdf (Pagina 43)

100

101

Working with Scope Objects

Note The difference b etwe en setting TriggerSample = (N + P - 1),

where

N and P are the parameters of the triggering scope (Scope 1) and

TriggerSample = -1 is that in the former case, the first sample of Scope 2

willbeatthesametimeasthelastsampleofScope1,whereasinthelatter,

thefirstsampleofScope2willbeonesampleafterthelastsampleofScope1.

This means that in the former case both scopes acquire simultaneously for

one s ample, and in the latter they will never simultaneously acquire.

Acquiring Gap-Free Data Using Two Scopes

With two scopes, you can acquire gap-free data. Gap-free data is data that two

scopes acquire consecutively, with no overlap. The first scope acquires data

up to N, then stops. The second scope begins to acquire data at N+1. This is

functionality that you cannot achieve through pre- or posttriggering.

Acquisiti on of Gap- F ree D ata o n pag e 2-20 graphically illustrate s how s copes

trigger one another. In this example, the

TriggerMode property of Scope 1 is

set to

'Software'. This allows Scope 1 to be software triggered to acquire

data when it re ceives the command

sc1.trigger.

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