Questions about the synchronization between output and analog input

Hi all

I now have a simple task which head a signal voltage (from PXI ao0) on a circuit and then your comments a voltage at the terminals of a component, for example, that one of the resistors in the circuit, through ai0 on PXI. So in this case, the synchronization between analog input and analog output must be made to avoid error of phase shift.

I tried to build my VI by learning this example: https://decibel.ni.com/content/docs/DOC-3882

However I have a few questions.

1. I noticed that there is a merged error fed the "start task" sub VI for the analog output.  What is the point of fusion to mistake?

2. I enclose my VI (also shown below) for the output voltage. I put my writing of DAQmx Subvi in the while loop so that I can change the voltage while the VI is running.

However, in the example, the author has been reading outside of the loop and before even the start task. What difference will it make?

3. I have also attached my synchronized VI. I always put the wavegeneration and the DAQmxwrite in the loop. A bulging guard error saying about samples is not available and needs to a higher sampling rate or a longer wait time. What causes this?

I appreciate that these problems can be solved. Thanks to you all.

(1) first you need start the task of acquiring, he'll wait for trigger here. And then you start the build task that provides this trigger. If acquisition could trigger and never start.

(3) you must first write something in the buffer (writing DAQmx), then only you can generate it (Daqmx Start).

Check Cont Gen tension Wfm - Int Clk - no Regeneration.vi in the help-> examples for example.

Tags: NI Software

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