Electrical and Electronics: Module 19

Module 19A: Measuring Instruments, Meters (Core)

Suggested time: 5 - 10 hours

Level: Introductory

Prerequisites: Modules 1, 2

Foundational Objectives

To work safely and cooperatively with other students and handle materials in a safe manner.
To demonstrate the safe use and knowledge of meters and hand and power tools used in the industry.
To make and interpret meter readings.
To use appropriate terminology for electricity or electronics in context.

Common Essential Learnings Foundational Objectives

To understand meters used in AC and DC circuits. (COM)

To compare different kinds of meters. (CCT)

To strengthen knowledge by measuring with meters and manipulating and interpreting data. (NUM)

Learning Objectives	Notes
19.1 To be able to connect basic meters to an electrical circuit.	Students should connect a voltmeter to a given circuit and be able to read it correctly. Repeat with an ammeter and an ohmmeter. Be aware of the safety concerns when hooking a meter to a live circuit. Students should examine a variety of meters and determine how they function internally. Show students how to change a galvanometer to an ammeter.
19.2 To be able to read an analog meter correctly. (NUM)	Connect several analog meters to different circuits and have students read the outcome. Change the range switch on an analog meter and have students determine the reading.
19.3 To use a multimeter correctly. (PSVS)	Explore, list and describe all the uses of a multimeter and determine how to connect it to an electrical circuit (voltage, current, resistor). Review and practise safety precautions when handling, using and storing a multimeter.
19.4 To compare an analog and digital meter. (CCT)	Use both types of meters and determine some advantages and disadvantages of each. Students should be able to describe D'Arsonval meter movement.
19.5 To be able to read different types of electrical service meters.	Students can read and calculate energy costs from a kilowatt-hour meter on their house or in the school.

Module 19B: Measuring Instruments, Meters (Core)

Suggested time: 4 - 7 hours

Level: Intermediate

Prerequisites: Modules 1, 2, 19A

Review or repeat Module 19A, as required before progressing to the next level module.

Learning Objectives	Notes
OSCILLOSCOPE
19.6 To explain the function of each of the controls on the oscilloscope. (COM)	Read the manual for the oscilloscope and locate the controls on the instrument. Observe the different functions of each of the controls on the oscilloscope.
19.7 To measure voltage using an oscilloscope. (NUM)	Connect an oscilloscope to a voltage supply (AC and DC) and determine different voltages.
19.8 To interpret wave forms on an oscilloscope. (TL)	Observe the different wave forms on an oscilloscope.
19.9 To use the oscilloscope to measure phase shift and frequency using Lissajous patterns. (NUM)	Connect the oscilloscope to a simple circuit made up of a capacitor and resistor connected to a sine wave source and measure the phase shift across the capacitor. Using the appropriate inputs of the oscilloscope, connect the probes to the "known" and "unknown" frequency sources and, using the Lissajous pattern, determine the frequency of the unknown wave.
19.10 To understand how pulse measurements are made on an oscilloscope. (COM)	Connect the oscilloscope to a digital circuit (e.g., 7490 decade counter) and measure: pulse width (PW), duty cycle (DC), rise time, fall time, amplitude, average value, pulse recurrence time (PRT) and pulse recurrence frequency (PRF).

LOGIC PROBE

19.11 To explain the use of the logic probe. (COM)	Touch the logic probe to various points on a digital circuit and interpret high and low logic levels.
19.12 To test digital components using the logic probe. (TL)	Use the logic probe to test a digital circuit that has been altered by the instructor.