1. What is a transducer?
2. Describe the difference between active and passive transducer?
3. Name at least five(5) important characteristics of a sensor?
4. Give five(5) examples of a sensors and their functions?
5. Explain the need for a signal conditioning process for a sensor output?
6. The circuit shown below in Fig.1 is a pressure measurement circuit. It consists of a pressure sensor
(MPX2010DP) , an operational amplifier (LM358AD) and a Bar graph display. The input pressure is
measured by the sensor in kilopascal (kPa) as a unit of pressure measurement which is widely used
throughout the world. The output of the sensor (Vsen) is between 0V – 25mV for pressure of between
0kPa – 10kPa.
XMM1
2
1
4
U2
U1A
R5
3
3kΩ
U1B
5
1kΩ
1
2
R1
4.77kΩ
8
R2
8
VCC 15V
7
6
LM358AD
VEE -15.0V
Fig 1
4
4 kPa
3
XMM3
R4
50kΩ
Vsen
10V
MPX2010DP
Key = P
XMM2
R3 12kΩ
4
Vout
Questions for Task 1:
LM358AD
DCD_BARGRAPH
5V
Construct the circuit in Fig.1 by using a circuit simulation software (Psim, Pspice, Multisim,
Mathlab/Simulink etc).
Procedure :
1. Run the simulation.
2. The slider (Key = P on the keyboard) is the input for pressure from 0 to 10 kPa.
3. Move the slider from 0 to 10 kPa. Read all the reading from multimeters XMM1,XMM2
and XMM3.
4. Then fill in the table 1 below and plot the graph for Pressure(kPa) vs Vout(V).
Reading
1
2
3
4
5
6
7
8
9
10
Pressure(kPa)
1
2
3
4
5
6
7
8
9
10
Vsen(mV)
V1(mV)
Table 1
7. Discussion .
8. Conclusion.
Note :
Please include a saved file of the simulation with the report for Task 1
Vout(V)