This experiment is designed to teach you about amplifying signals introduce you to basic digital filtering and reinforce generating data files for later use. This project and report may be done in teams of two. The report is to be in memo format.
Using the components in your kit, construct the following circuit on your solder less breadboard. Use the long thermocouple for the measurement TC and the short one for the ice point. You may connect the two constantan wires on the breadboard without affecting the calibration of the circuit.
Use the supplied code snippet for the amplifier set-up, adjusting R1 and R2 as follows to calibrate your amplifier. This may take several iterations, but once it is calibrated, you will not have to repeat this procedure unless you change the circuit.
Using the program as a base, modify the code so that it will display the mean value in degrees C in addition to the voltage.
You will need to use a formula node to accomplish this and enter the following formula.
Y = 22.63x3 – 55.706x2 + 221.97x + 0.0184
Where Y is temperature out and x is volts input (in volts)
Modify the program to save the temperature in degrees C, and an elapsed time value since the program started, to a file with one sample being saved every 10 seconds.
Place a pan of ice water on the stove. Using the program developed for part 3, record the temperature of the water as it heats to boiling, recording the values in your file. Do not forget to keep the reference TC in a good pan of ice water, or your results will be skewed.
Graph this file in excel to include in your report. Also include one page of your data file with your graph.
For help with programming in LabVIEW please review the appropriate videos in our Learn to LabVIEW with MyDAQ Course.
Report and Submission:
Include the VI documentation Front Panel, Block diagram with hidden frames, list of SubVI’s and express VI’s
In your report discuss the results as well as any limitations you noted for this method of amplification.
Include a picture of your circuit in the report.
Consider the following in your report: