ELET $21$

Instrumentation Electronics

Final Lab Exam

Question $1$

The circuit shown in Figure $1$ is placed in a car where the temperature is changing. The transducer is a thermistor with the following specification, RT$=10$k at reference temperature of $25C$; temperature coefficient of resistance $=-1k\frac{}{}C.$

Construct th

a$)$ What is the reference voltage?

$\frac{20}{20+10}12v=$

$[1$ mark$]$

b$)$ Measure the output voltage for the given RT and determine the temperature

$\backslash$table$[[$RT$,$Vout,Temperature$],[1\mathrm{.}5$ k$,12,],[18$ k$,$@$,]]$

$[2$ marks$]$

c$)$ If the output is connected to a $12$ V fan, at what temperature will the fan switch from OFF state to ON state?

$[2$ marks$]$

Yanbu Industrial College

EE

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