E1C01 09/14/2010
15:40:38 Page 33
1.7 Select three different types of measurement systems with which you have experience, and identify
which attributes of the system comprise the measurement system stages of Figure 1.5.
1.8 Identify the measurement system stages for the following systems (refer back to Figure 1.5 and use
other resources, such as a library or Internet search, as needed to learn more about each system):
a. Room thermostat
b. Automobile speedometer
c. Portable CD stereo system
d. Antilock braking system (automobile)
e. Automobile cruise control
f. Throttle position sensor for a Formula One race car
1.9 What is the range of the calibration data of Table 1.5?
1.10 For the calibration data of Table 1.5, plot the results using rectangular and log-log scales. Discuss the
apparent advantages of either presentation.
1.11 For the calibration data of Table 1.5, determine the static sensitivity of the system at (a) X ¼ 5;
(b) X ¼ 10; and (c) X ¼ 20. For which input values is the system more sensitive? Explain what this
might mean in terms of a measurement and in terms of measurement errors.
1.12 Consider the voltmeter calibration data in Table 1.6. Plot the data using a suitable scale. Specify the
percent maximum hysteresis based on full-scale range. Input X is based on a standard known to be
accurate to better than 0.05 mV.
1.13 Three clocks are compared to a time standard at three successive hours. The data are given in
Table 1.7. Using Figure 1.12 as a guide, arrange these clocks in order of estimated accuracy. Discuss
your choices.
Table 1.5 Calibration Data
X [cm]
Y [V]
X [cm]
Y [V]
0.5
0.4
10.0
15.8
1.0
1.0
20.0
36.4
2.0
2.3
50.0
110.1
5.0
6.9
100.0
253.2
Table 1.6 Voltmeter Calibration Data
Increasing Input [mV]
Decreasing Input [mV]
X
Y
X
Y
0.0
0.1
5.0
5.0
1.0
1.1
4.0
4.2
2.0
2.1
3.0
3.2
3.0
3.0
2.0
2.2
4.0
4.1
1.0
1.2
5.0
5.0
0.0
0.2
Problems 33