CLAD2017 - DAQmx - Samples per Channel or Number of Samples per Channel

[SercoSteveB]

Consider the VIs shown below that are functionally identical accept for the values of the constants 'samples per channel' and 'number of samples per channel'.  Which of the following show the contents of VI1 Data Array Size and VI2 Data Array Size following execution of the VIs.

a)

b)

c)

d)

[GladysToMeetYou]

A

[PakAsia]

A.

In VI1 DAQ only wants two samples and in VI2 there are only two samples available.

[Tsjabrantes]

Hello guys!

VI_1VI_2

So, letter A is the right answer. 

[crossrulz]

A

First clue is that there are two channels.  Therefore the size of the first dimension will be 2 for both.  A is the only one that works with that requirement.

[Ellie90]

a

[A_rid]

A

[nik35324]

A

[Matt-A.]

A

[qubirt]

A

[CataM]

a)

[SercoSteveB]

Answer: A.  Nice one all.

[Miguel_Reckon]

Ninguna de las anteriores! Debido a que no hay ningun ciclo que permita al READ DAQmx adquirir la muestras nuevamente

[Al_Niz]

@ Miguel_Reckon Translation: "None of the above! Because there is no loop that allows the READ DAQmx to acquire the data again"

No loop is needed to get a 2x2 array because we read 2 channels simultaneously (ai0 and ai1).

arraySize= (number of channels) x (number of samples).

[Oleksiy7979]

Can somebody explain why we have 2 sample points to read, not 4 from the second VI?

[crossrulz]

The DAQmx Timing is setting up the task to be Finite Samples and the number of samples is 2.  So after 2 samples are read, the task will stop.

[istan0227]

A