Instrumentation &
Measurement

og Voltmeter ( is used to measure voltage of an electric circuit. The reading of the VOM is shown in Figure Q2a. Given the Full Scale Range of this VOM is set at 50V, the accuracy of this VOM is +/- 2.5% of full scale. (i) What is the value of the VOM reading as shown in Figure Q2a? (ii) Calculate the error by this VOM voltage measurement. 10 20 (2 marks) (3 marks) 600.060 DCV O ACV 0 60 40 2 100 20 10 15 1 so 30 20 200 40 DCV 'O ACV Figure Q2a b) A Digital Multimeter (DMM) is used to measure the DC voltage of an electric circuit. The reading of the DMM is shown in Figure Q2b. Given the Full Scale Range of this DMM is set at 200V, the accuracy of this DMM is +1- (1% of reading + 5 digits (i) State this DMMisa 32 , 4, or 42 digits meter. (ii) Calculate the error by this DMM voltage measurement. EE 1501 :gqgv Figure Q2b (2 marks) (3 marks) c) d) e) Briefly describe with the aid ofsketch, how an Inductive Pick-up can be used to measure the rotational speed of a metal gear shaft? (5 marks) There are four common operation principles of Temperature Sensor, one example is by using thermal expansion of material. Describe the other three common operation principles of Temperature Sensor. (6 marks) Name and briefly describe the methodology with the aid of sketch, how to measure resistance without loading effect? (4 marks)