Lab #4:

Objective:

To learn to use computers equipped for A/D and D/A conversion. Analyze a DC motor with the equipped computer.

Pre-Lab:

1. Read over the Labview tutorial guide, and complete the tutorial on a computer before coming to the lab.

2. Set up a Labview interface to read a 5 Vdc input and indicate when it is activated. Posted.

3. Set up a Labview interface to read data values using the A/D card and graph them on the screen, and save the values to a file. File.

Procedure:

1. Setup a switch and test the Labview interface developed in prelab step #2.

2. Connect a potentiometer to the analog card and test the Labview interface developed in step #3.

3. Connect a signal generator to the analog input, and slowly increase the freguency. Record what happpens.

The graph on the screen in Labview changes with the changing frequency. As the frequency is increased we begin to see a pattern develop. The graph showed us resonant and beat frequencies.

4. Modify the Labview interface in prelab #3 to read the encoder outputs (instead of the analog input), and produce a velocity value. Use a step function to start the motor, and measure the speed.