Start Trigger and Stop After n Pulses for Continuous Analog Input Using LabVIEW with DAQmx

[LaRisa_M]

Overview

This VI demonstrates how to acquire a continuous amount of data (Waveform) using an internal clock and a digital start and reference trigger.

 
Description

The reference trigger that starts a continuous analog input acquisition is generated using a counter output after a desired number of digital pulses are counted. Make sure your signal input terminal matches the Physical Channel I/O Control. Also, make sure your digital trigger terminal matches the Trigger Source and Counter Controls. For further connection information, refer to the device documentation.

Requirements

• LabVIEW 2012 (or compatible)

Steps to Implement or Execute Code

1. Select the physical channel to correspond to where your signal is input on the DAQ device.
2. Enter the minimum and maximum voltage ranges. Note: For better accuracy, match the Input Ranges to the expected voltage level of the measured signal.
3. Select the number of Samples per Channel to acquire.
4. Set the Rate of the acquisition. Note: The Rate should be AT LEAST twice as fast as the maximum frequency component of the signal being acquired.
5. Set the Trigger Source and the polarity of the Start Trigger Edge.
6. Set the terminal to be used as the Reference Trigger Source and the number of pulses to be counted before stopping the acquisition.
7. Configure the counter to be used. Note: The Reference Trigger Source should be set as the Counter Output Terminal of the Counter configured in this step.

Additional Information or References
VI Snippet

**This document has been updated to meet the current required format for the NI Code Exchange.**

[HunterSeeker]

Could you please add a sceenshot of your block diagram and or front panel.

Thanks

[ColeTrain]

I would also like to see that block diagram.  It would be better so that I don't have to download to see what's going on.

[ColeTrain]

Thanks!

[小蔷薇]

xiexie~