Experiment 5: Dc Bridges in Measurement and Data Acquisition
This this laboratory combines a dc bridge circuit with a LabVIEW program to create a self-balancing bridge that can measure resistance values. The LabVIEW program uses analog inputs to measure the voltage output of the dc bridge for an unknown reistance. This input adjusts an analog output through an algorithm that will drive the bridge output voltage to a balance point. THe program then uses the final analog output value to compute the unknown resistance value.
This collection of videos shows how to create subVI's that will read and write anlog data, which is a key part of the program. Another video shows how to store values between loop iterations using shift registers. This will allow the measured bridge output values from each program adjustment to be saved and used to modify the system. This process of measurement and adjustment will drive the dc bridge to a balance point. The program will then compute the unknown resistance based on the final analog output voltage.
Presentation Times:
- Part 1: 8:10 Using Shift Registers in LabVIEW Programming
- Part 2: 12:40 Programing Analog I/O Using SubVIs