Homework due on March 2, 2007

Now that the February exam is over we are ready to begin our final push to the IGCSE exams. We are going to balance filling in the holes of information we have yet to learn off the syllabus with review of what we have learned. To start, please read pages 136-139 and answer the following questions:

Pg 136-137

1. What are the disadvantages of logging data manually compared with automatic data logging? (3 pts)
2. What is meant by remote sensing? (3 pts)
3. Explain how electronic temperature sensors work. (5 pts)
4. Explain why the electrical signal from a humidity sensor cannot be fed straight into a computer. (5-6 pts)

Pg 138-139

1. When analysing data logging systems you need to make several important decisions. Name 3 decisions that need to be made. (3 pts)
2. What are the choice of sensors you have? (3 pts)
3. Why is it important to calibrate sensors? (3 pts)
4. Can a calibrated sensor be used with any interface? Why or why not? (3 pts)