HW+_4+Solutions

HW+_4+Solutions - ECE 4001 Project Engineering and...

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ECE 4001 -- Project Engineering and Professional Practice Homework Assignment #4 (This homework set is due at the beginning of class on Wednesday, October 21, 2009) Problem 1. (60 points) Experimental Measurements You are the lead engineer on a project that requires the use of a temperature sensor module accurate to ± 2.0 °C (± 3 σ values) over a temperature range from 0 to 50 °C. A prospective vendor has sent you 10 modules for your evaluation. Measurements of all units were made by cycling through the temperature range in a calibrated thermal chamber. Temperature values ranged from 0 to 50 °C in steps of 1 °C. Results are shown in the Excel file provided with the homework assignment. As plots in the Excel file show, it is clear that both random and systematic errors are present, and that all of the units would not meet the above specification. a) What type of measurement errors appear in the data? Bias error, Linearity error, Random error b) What is the dominant type of measurement error exhibited by the temperature sensor? Linearity error c) Suppose there is a feature on the sensor that allows you to store a look-up table that allows you to calibrate out systemic errors. However, you will not be able to test every module over temperature once you are in production, so you need to derive ONE table of calibration values
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This note was uploaded on 02/08/2011 for the course ECE 4001 taught by Professor Frazier during the Fall '09 term at Georgia Tech.

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HW+_4+Solutions - ECE 4001 Project Engineering and...

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