Lab Day 4

Quiz #1:

Temperature Measurement System Lab

In this lab, we designed and constructed a temperature measurement system. The system used a thermistor to detect temperature changes. We created an electrical circuit which uses the resistance change to output a voltage which indicates the temperature of the thermistor.

This is a picture from the pre-lab, we used the graph to determine the temperature at 25 degrees Celsius and 37 degrees Celsius. From those temperatures, the resistances were 11,000 ohms and 7,000 ohms. The calculated resistances were 5,000 ohms and 15,400 ohms.

We used a 3000 ohms resistor and a 12,000 ohms resistor that was the closest resistor from the calculated value from the pre-lab. At room temperature the 3,000 ohms resistor was 1.032V and body temperature was 1.547V. At room temperature the 12,000 ohms resistor was 2.57V and body temperature was 3.20V.

  

Conclusion: This is a picture for the post-lab. The output sensitivity was off since the resistor used were lower than the calculated values for about 4.5%.

This is a picture of the circuit.

These are the videos of the operating circuit.