Generate Two Pulse Trains With a 90 Degree Phase Shift

Updated Sep 24, 2024

Environment

Hardware

USB-6363
VirtualBench All-in-One Instrument

Driver

NI-DAQmx

NI Data Acquisition (DAQ) hardware has a counter that can be used to generate a pulse train. This tutorial will show you how to generate a finite two-pulse train with a 90-degree phase shift using USB-6363, this can be used to simulate a quadrature encoder for your application.

Hardware Setup

USB-6363 is used to generate a two-pulse train:
- Connect CTR 0 OUT (PFI12) to the NI VirtualBench.
- Connect CTR 1 OUT (PFI13) to the NI VirtualBench.
NI VirtualBench (no longer sold) is used to view the result from both counters. Refer to the VirtualBench Help for more information about setup and installation. You could also choose another type of device to measure and display the signals.

Software Setup

Make sure to install LabVIEW and NI-DAQmx driver.
Copy the VI snipped below and paste it into your LabVIEW block diagram, here is some information about Using VI Snippets to Store and Share Reusable Code Sections .
Make sure the setting for the counters is correct.

Note: This image is a LabVIEW snippet, which includes LabVIEW code that you can reuse in your project. To use a snippet, right-click the image, save it to your computer, and drag the file onto your LabVIEW diagram.

Here is the result for a finite two-pulse train with a 90-degree phase shift using USB-6363:

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