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Unformatted text preview: EE 4770 Homework 2 Due: 19 February 1999 Problem 1: Design a system to convert temperature, x ∈ [1000 K , 1200 K], to a voltage H ( x ) = ( x- 1000 K) V 20 K . Use a type-B thermocouple and an isothermal block with an integrated temperature sensor. The isothermal block will be exposed to temperatures in [40 ◦ C , 60 ◦ C]. The response of the thermocouple can be found in NIST Standard Reference Database 60, NIST ITS-90 Thermocouple Database, Version 1.0 and is posted on the web by Omega Engineering at http://www.omega.com/techref/tctables/temper11.html. The integrated temperature sensor has response H its ( x ) = x μ A K . The conversion should use only analog circuitry. Design the circuit using linear model(s) of the thermocouple based on the NIST thermocouple tables. Use the integrated temperature sensor to construct an electronic ice bath circuit. • Show the linear model(s) used in the design. If two linear models are used explain why two were necessary; if one was used explain why only one suffices; if three or more are being considered see the instructor or TA before submitting a solution. • Show a schematic of the circuit showing all component and supply values. Overview: The circuit is to generate a voltage linearly related to temperature using a thermocouple, with an output of zero volts at 1000 K . The solution is to use a linear thermocouple model (which is fairly accurate over the temperatures to be encountered) so linear amplifiers can be used. The conditioning circuit needs to perform two functions. First it must “add on” extra voltage to the thermocouple output to accountneeds to perform two functions....
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This note was uploaded on 11/28/2011 for the course EE 4770 taught by Professor Staff during the Fall '99 term at LSU.
- Fall '99