Residential Audio & Video Systems Copyright © 2005 Heathkit Company, Inc. All Rights Reserved Presentation 3 – Using the Multimeter

2 Objectives At the end of this presentation, you will be able to:

3 Demonstrate the proper method of measuring DC and AC voltages. Demonstrate the proper method of measuring resistance and checking continuity. Demonstrate the proper method of measuring current.

4 Becoming Familiar with the Digital Multimeter.

5 DC AC V  OFF m 20M 2M 200 k 20 k 2k 200 A µ 20m 2m 200m 10A V V  COMmA 10A

6 DC AC V  OFF m 20M 2M 200 k 20 k 2k 200 A µ 20m 2m 200m 10A V V  COMmA 10A Display Function/ Range Switch Input Terminals

7 3-1/2 Digit Display

8 Range and Function Switch DC AC V  OFF m 20M 2M 200 k 20 k 2k 200 A µ 20m 2m 200m 10A

9 Input Terminals V V  COMmA 10A

10 Measuring an AC Voltage

11 AC/DC Switch DC AC V  OFF m 20M 2M 200 k 20 k 2k 200 A µ 20m 2m DC AC 200m 10A

12 Set the Voltage Range DC AC V  OFF m 20M 2M 200 k 20 k 2k 200 A µ 20m 2m 200m 10A

13 When measuring an unknown voltage, set the meter to its highest voltage range.

14 Position of leads when measuring voltage. V V  COMmA 10A

15

16

17 Measuring a DC Voltage.

18 Set the AC/DC Switch to DC. DC AC V  OFF m 20M 2M 200 k 20 k 2k 200 A µ 20m 2m DC AC 200m 10A

19 Set the Voltage Range to 20. DC AC V  OFF m 20M 2M 200 k 20 k 2k 200 A µ 20m 2m 200m 10A

20 Position the test leads for measuring voltage. V V  COMmA 10A

21 P9P8 -12 V Ground

22 P9P8 Back Probing the Connector

23

24 Measuring Resistance.

25 When using the Ohmmeter, remove power from the circuit under test.

26

27

28 Disconnect Leads 8 Ohms

29 Setting the Resistance Range. DC AC V  OFF m 20M 2M 200 k 20 k 2k 200 A µ 20m 2m 200m 10A

30 Position of leads when measuring resistance. V V  COMmA 10A

31

32

33 Measuring Current.

34 Measuring current is inconvenient because you must break the circuit you wish to test.

35 P9P8 -12 V

36 Set the AC/DC Switch to DC. DC AC V  OFF m 20M 2M 200 k 20 k 2k 200 A µ 20m 2m DC AC 200m 10A

37 Set the Current Range. DC AC V  OFF m 20M 2M 200 k 20 k 2k 200 A µ 20m 2m 200m 10A

38 Move the red lead to the low current terminal. V V  COMmA 10A

39 P9P8 Break the circuit.

40 P9P8

41 P9P8 Insert the ammeter.

42 Read the current.

43 P9P8 Restore the circuit.

Residential Audio & Video Systems Copyright © 2005 Heathkit Company, Inc. All Rights Reserved End