Book Image

Data Acquisition using LabVIEW

By : Behzad Ehsani
Book Image

Data Acquisition using LabVIEW

By: Behzad Ehsani

Overview of this book

NI LabVIEW's intuitive graphical interface eliminates the steep learning curve associated with text-based languages such as C or C++. LabVIEW is a proven and powerful integrated development environment to interact with measurement and control hardware, analyze data, publish results, and distribute systems. This hands-on tutorial guide helps you harness the power of LabVIEW for data acquisition. This book begins with a quick introduction to LabVIEW, running through the fundamentals of communication and data collection. Then get to grips with the auto-code generation feature of LabVIEW using its GUI interface. You will learn how to use NI-DAQmax Data acquisition VIs, showing how LabVIEW can be used to appropriate a true physical phenomenon (such as temperature, light, and so on) and convert it to an appropriate data type that can be manipulated and analyzed with a computer. You will also learn how to create Distribution Kit for LabVIEW, acquainting yourself with various debugging techniques offered by LabVIEW to help you in situations where bugs are not letting you run your programs as intended. By the end of the book, you will have a clear idea how to build your own data acquisition system independently and much more.
Table of Contents (18 chapters)
Data Acquisition Using LabVIEW
Credits
About the Author
Acknowledgments
About the Reviewer
www.PacktPub.com
Preface
9
Alternate Software for DAQ

Stepping through voltages


In this example, we will use a programmable power supply to step through five different voltages (since we use an array, the number of voltages can be as many as the number of array elements). We will send SCPI commands to a programmable power supply (KORAD KA3005P programmable DC power supply) to set the voltage. In the next step, we query the instrument to report back the value that the power supply is currently set on. Finally, we will collect all the returned values in a different array.

The power supply is connected to the LabVIEW computer via USB. We will use serial communication to send commands and collect returned values. The communication part of the VI is achieved via a SUB VI called Serial P.P.S.

To achieve the prceding scenario, we will only need four SCPI commands:

  1. OUT1: This will set the output to ON mode

  2. VSET1: This will set the output channel 1 to <value> volts

  3. VSET1 : This will query voltage at channel 1

  4. OUT0: This will turn the output off

Note...