# Bonnie Adams postlab 4 - Bonnie Adams BME 405 Postlab 4...

• Lab Report
• 5

This preview shows pages 1–2. Sign up to view the full content.

Bonnie Adams BME 405 Postlab 4 Laboratory 4: Temperature measurements – Dynamic characteristics of first order systems – Virtual thermometer Introduction: The purpose of this lab was to learn how to use both the thermocouple and the thermistor, measure the dynamic characteristic of the first-order thermometer, and to design a vi that operates like a medical thermometer using the thermistor. Data: Hooking up the thermocouple and reading temperature: In this section, we used the thermocouple to read temperatures. On the BNC connector, the thermocouple was plugged in and the switch was moved to the right on the connector box BNC 2120 to enable that input. In LabVIEW, we opened a new vi and made a new DAQmx task called thermocouple output. The input was thermocouple ai1. The thermocouple type was K (which is written on the thermocouple connector), the CJC source was set to constant, and the CJC value was room temperature, which for this experiment was assumed to be 20 o C. We set the task to continuous acquisition mode, samples to read to 1000 and sampling rate to 200 Hz. On the front panel, we had a waveform graph indicator to display the output of the vi. We ran the vi and verified that the thermocouple worked by putting the tip of the thermocouple in different temperatures and comparing it with the temperature changes on the graph. The values returned were good (hand=28, room=21, ice=2). The relationship between the voltage and the temperature is Vref = c0 + c1*Tref + c2*Tref^2 + c3*Tref^3 + c4*Tref^4 + c5*Tref^5 + c6*Tref^6 + c7*Tref^7 + c8*Tref^8 + c9*Tref^9, where coefficients c0 through c9 are very small, between .039 and -1.2E-26. (Source: ) The convenience of using a thermocouple is that no complex circuit muct be built, and the thermocouple is standardized so the conversion is built in. However, there are sources of error

This preview has intentionally blurred sections. Sign up to view the full version.

This is the end of the preview. Sign up to access the rest of the document.
• Spring '07
• Maarek
• BNC connector, Thermometers, Thermometer

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern