Unformatted text preview:

LABORATORY IIBAE 5413SPRING 2006Preliminary work:OBJECTIVE: Selection and calibration of a thermistor and circuitPROCEDURE: Read the resource material on application of NTC thermistors (NTC Thermistors, Thermometrics, Inc.) Select and test a thermistor circuit that can be used to transduce temperature to voltage. Use the thermistor provided in your instrumentation kit. Calibrate the circuit against the thermocouple and voltmeter inyour instrumentation kit. You may use an ice-bath to generate a freezing point reference.TITLE: Determination of Dynamic ResponseOBJECTIVE:To experimentally identify the dynamic characteristic of thermistors in air and in waterPROCEDURE:Step testing or frequency testing may be used to determine dynamic system properties.Time constant and damping ratio can be used to describe characteristics of dynamic systems. Both constants can be determined through experiment. The following laboratory focuses on determination of time constants for overdamped dynamic systems. Two thermistors have beenselected for study, the fast reacting thermistor in your instrumentation kit which has a time constant of near 2 seconds in air, and another slower reacting thermistor of unknown time constant(s). You may use the circuit that you designed earlier for both thermistors.This circuit should be used for conversion of thermistor signals and the output may be connected to a digital storage oscilloscope which may be used to acquire response data. The voltage data will represent temperature response of a thermistor. The thermistors can be subjected to temperature inputs and dynamic response determined.Use a step test in water to determine the time constant of both the fast and slow thermistor in water. Use % incomplete response analysis to determine time constants for the slow thermistor. Draw a conclusion regarding whether a first or second order model is appropriate for this thermistor. An apparatus is provided to allow exposing thermistors to air temperature variation. Use the apparatus to perform a step test to determine the time constantof the fast thermistor in air. Calculate the ratio of the time constants for air and water for the fast thermistor based on the theoretical derivation. Report the results for the above tests and compare the theoretical and actual measurements.The apparatus used for the study contains a Hall Effect switch. Investigate this device. Report, briefly, the physical principle of this sensor and sketch the circuit used in the particular device used on the apparatus.REPORT:Briefly report the above work. Include a short introduction describing the purpose of the work. Describe the theoretical procedures and the mathematical procedures. Finally, report theresults of the work. The apparatus used for the study contains a Hall Effect switch. Report your investigation of this device including the physical principle used in this sensor and the circuit used in these particular devices as used on the apparatus. Include an abstract on thefront page of the report that includes a title, your name. The abstract should encapsulate the critical points of the


View Full Document

O-K-State BAE 5413 - Laboratory Guide

Download Laboratory Guide
Our administrator received your request to download this document. We will send you the file to your email shortly.
Loading Unlocking...
Login

Join to view Laboratory Guide and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Laboratory Guide 2 2 and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?