Acquire, Record, and Process Data in NI DAQExpress

Publish Date: Oct 09, 2017 | 0 Ratings | 0.00 out of 5 | Print | Submit your review

Overview

You can use DAQExpress software to configure a variety of measurements without programming. Learn how to acquire data from sensors, generate output signals, do digital I/O, and read from counters and encoders.

Table of Contents

  1. Configure Hardware and Acquire Data
  2. Analyzing Acquired Data with Analysis Panels

1. Configure Hardware and Acquire Data

 

Immediately Access Hardware 

The Hardware tile is the fastest way to start interacting with your hardware. You can instantly access data from your devices, quickly set up your measurement system, and configure settings across multiple channels.

The Project tile lets you create projects to save your measurement configurations, or create a custom application. The Learning tile gives you access to tutorials and examples to help you get started faster.

Automatic Scaling of Supported Measurement Types

DAQExpress automatically detects any supported NI DAQ hardware device you connect to your computer. Select your device to view the types of measurements supported by your DAQ hardware.  For example, if you are using a USB DAQ device with analog input, counter input, digital input, and digital output channels, then those measurements will be available for you to use with that device.

If you don’t have an NI DAQ device connected to your computer, or if your hardware device doesn’t support a particular measurement, you can use measurements in demo mode with simulated data by going to the Projects tab and selecting Measurement Panels.

Quickly Configure and Verify Measurement Settings 

After you have a measurement panel open, you can specify your measurement settings using the configuration pane on the right-hand side of the screen. You can name channels and specify the sensor type and settings, the channel on your device you want to use, and the plot color for that particular channel. You can quickly add more channels to your measurement by clicking the Add button below the graph.

To configure settings that are common across multiple channels, like the sampling rate or a trigger to start your acquisition, select the Task tab. Each measurement panel has to share the same sampling rate and trigger. To trigger different channels based on different sources, or acquire channels at different rates, you need to create a new measurement panel for those channels. You can do that by clicking the plus button as shown below.

 

To edit multiple channels at once, switch the Tile View option to the Table View to batch edit channels.

Easily Record Data to Disk 

Your measurement should automatically start. To restart your measurement, use the Play and Pause buttons in the toolbar. You can record data by selecting the Record button. There are three options:

  1. Record - Keeps saving data until you choose to stop the recording
  2. Record (Timed) —Records data for a specified period of time
  3. Capture Frame—Saves the data shown on your graph at that moment in time

When the data has been recorded, it is saved in the data area on the left of the screen.

Open and Explore Recorded Data

Double-click any data item you’ve recorded to view and explore it. This opens the data in a new tab. Here, you can zoom in on parts of your data or analyze data sets by clicking the More analysis panels… button.

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2. Analyzing Acquired Data with Analysis Panels

Analysis panels let you apply filters, time domain transfers, and other analysis routines to your data. You can adjust settings and see how your output data is affected. After you’ve set up your analysis, you can capture the analyzed data to use later.

Some analysis functions can only be used in the interactive measurement panel and are not supported in graphical programs written on the block diagram in DAQExpress, as summarized in the table below:

Curve Fit Interactive and Programmed FFT Spectrum Interactive Only
Scaling and Mapping Tone Measurements
Filter Pulse and Transition Measurements Interactive and Programmed
Statistics Limit Testing
Histogram Resample
Amplitude Measurements Signal Correlation

 

Click here to learn more about using analysis panels to interactively analyze captured data sets.

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