In this paper a steady testing system is designed based on Lab VIEW in the structure of double state machines, which is with functions such as data acquisition, testing information display, failure analyzing and data saving. This programming pattern is similar to the pattern used throughout the. To select more than one channel, hold down the Ctrl button while clicking on the channel names.
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We appreciate your patience as we improve our online experience. Click the Run button to run the application. Global channels - Virtual channels defined outside a task.
For your ease please go to this video tutorial:. Windows or dqa Back to Top 5.
Using the DAQ Assistant to Automatically Generate LabVIEW Code
This state model consists of five states in which a task can reside. Test the Task You can test the task in the DAQ Assistant before finalizing it to make sure you connected wssistant sensors properly. Counter input channels— CIChannel class.
Once a task has been cleared, it cannot be used unless it is recreated. Although it is not always required, using the NI-DAQmx Start Task function to explicitly start a task involving a hardware-timed acquisition or generation is preferred.
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Taking Measurements in NI LabVIEW with Your NI USB-TC01 - National Instruments
Before You Begin To use this tutorial, you must have the following software and hardware installed in your system: Back to Top 2. Each clock pulse initiates the acquisition or generation of one sample for each virtual channel included in the task.
In the running state, the task performs the specified acquisition or generation. To select more than one channel, hold down the Ctrl button while clicking on the channel names.
We appreciate your patience as we improve our online experience. How is that done? This is because the timing information eaq automatically extracted from the waveform input to the configured DAQ Assistant Express VI, eliminating the need to manually specify the timing information.
Add a chart display to view the data on the Front Panel.
Others require multiple devices to be synchronized. Below is a snippet that shows how to use the function for a digital start trigger coming in on PFI0 and looking for a rising edge on that line.
I have not yet found a way to asskstant out a pulse width modulated digital signal tha I need to use to control a servo, or a DC motor speed. Conceptually, a task represents a measurement or generation you want to perform.
NI-DAQmx Properties provide access to all of the properties associated with a data acquisition operation. An NI-DAQmx virtual channel consists of a physical channel on a DAQ device and the configuration information for this physical channel, such as input range and custom scaling.
Create the Task In this example, we will configure a simple voltage analog input measurement. It is intended for both the beginner who wants to learn how to use the DAQ Assistant, as well as the experienced user who wishes to take advantage of advanced NI-DAQmx functionality. Figure 8 Back to Top 3. The value wired into the stop input assiatant determine whether or not the Express VI will have to reconfigure the task on the next iteration.
Configure the device and channel to measure.
By default, the properties page should pop up, allowing you to configure your task. The following snippet creates a simple analog input voltage channel:. As with previous examples, you can select to create new local channels or copy already existing DAQmx Global Channels.