Fundamentals of Multimeter Training

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1 Fundamentals of Multimeter Training

2 House Cleaning REMINDER: This Webinar is being Recorded Please Turn Off Cell Phones net

3 About the Presenter Larry Rambeaux Senior Account Representative Larry has over 20 years experience working with heavy duty fleets. He is an outstanding trainer and uses his extensive experience to help his customers make the best choices for their electrical needs. He has been awarded the prestigious Recognized Associate Award from the Technology & Maintenance Council. Larry s knowledge of electrical systems enables him to help his customers identify and remedy a fleets electrical issues lrambeaux@purkeys.net net

4 Overview Multimeter Voltmeter Ammeter Ohmeter Diode Check Continuity 4

5 Pre-Check Multimeters Battery Check 5

6 Pre-Check Multimeters Check and Replace 6

7 Pre-Check Multimeters Testing Leads and Meter 7

8 Pre-Check Multimeters Testing Meter Only 8

9 Pre-Check Multimeters Testing Red Leads 9

10 Pre-Check Multimeters Testing Black Leads 10

11 Pre-Check Multimeters Auto Voltage Operation Will Automatically Move to the Proper Range 11

12 Pre-Check Multimeters Manual Voltage Operation No Icon Push Range 12

13 Pre-Check Multimeters Hold Functions Push Hold Button 13

14 AC Voltage Operation Range 0 to 1000 Press Mode Until You See the AC Symbol 14

15 DC Voltage Operation Range 0 to 750 Press Mode Until You See the DC Symbol 15

16 No Current Flowing Red Lead: Black Lead: V 16

17 No Current Flowing Red Lead: Black Lead: V 17

18 No Current Flowing Red Lead: Black Lead: V 18

19 No Current Flowing Red Lead: Black Lead: V 19

20 No Current Flowing Red Lead: Black Lead: V 20

21 No Current Flowing Red Lead: Black Lead: V V V 21

22 Current Flowing Red Lead: Black Lead: Red Lead: Black Lead: V 6.70V 22

23 Current Flowing Red Lead: Black Lead: V 23

24 Current Flowing Red Lead: Black Lead: V 24

25 Must Have Current Flow to Have Voltage Drops A Voltmeter Only Reads Voltage 25

26 Using the Ammeter Ammeter 26

27 Pre-Check Multimeters Test Fuses (10 amp) OL

28 Pre-Check Multimeters Test Fuses (400 milliamp) OL

29 Pre-Check Multimeters Replacing Fuses.400 ma Fuse 10A Fuse 29

30 Using In-Line Ammeter Pretesting with a 10 amp fuse Remove the ground at the battery and place a 10 amp fuse assembly in series. If the fuse blows the current level is over 10 amps. DO NOT placeyour meter in this circuit, it will blow the internal meter fuse. To Ground To Starter 30

31 Using In-Line Ammeter Pretesting with a 10 amp fuse Move the red lead to the 10 amp connector hole and turn the rotary switch to amp DC. Place the red lead on the terminal of the cable and place the black lead on the battery post. To Ground 1.27 To Starter 31

32 Using In-Line Ammeter In this example, 2.53 amps flow from the battery to the light, then through the light to the read lead. The current then flows through the meter, then back to the battery through the black lead. To Ground 2.53 To Starter 32

33 Using In-Line Ammeter Pretesting with a 10 amp fuse If the ammeter reads 0 to.40, you may have the range set too high. To protect the meter from surges insert the fuse assembly between the cable connection and the batter ground. Move the red lead to the 400 ma connector hole and turn the rotary dial to ma. Remove the test fuse and read the display. Remember the meter is reading milliamps. A 25 on this scale means 25mA, which equals.025 amps. To Ground To Starter 33

34 Using In-Line Ammeter 1 ma=.001 Amps 400 ma=.4 Amps To Ground To Starter 34

35 Using In-Line Ammeter This is a very small amount of current. Be sure to use care when the meter is in this range. DO NOT open the tractor s door or turn on any loads that exceeds.4 amps because is will blow the 400mA fuse. To Ground To Starter 35

36 Magnetic Flux 36

37 Clip - On 37

38 Clip - On Clip Around Wire/Cable Being Measured Jaws Must Close Completely Must Zero Out Each Time Observe Arrow to Direction of Current Flow 38

39 Ammeter Ammeter Only Measures Current Flow 39

40 Ohmmeter Ohmmeter 40

41 Ohmmeter Position # M Ω 41

42 Ohmmeter Position # M Ω +6 M= 10 5,460,000 Ohms 42

43 Ohmmeter Position # K Ω 43

44 Ohmmeter Position # k Ω +3 k = 10 99,000 Ohms 44

45 Ohmmeter Position # M Ω 45

46 Ohmmeter Position # M Ω +6 M= 10 9,580,000 Ohms 46

47 Ohmmeter Position #4.990 M Ω 47

48 Ohmmeter Position #4.990 M Ω +6 M= ,000 Ohms 48

49 Ohmmeter Position # k Ω 49

50 Ohmmeter Position # k Ω +3 k= 10 9,760 Ohms 50

51 Ohmmeter Position # k Ω 51

52 Ohmmeter Position # k Ω +3 k= 10 21,710 Ohms 52

53 Ohmmeter Position #7.546 k Ω 53

54 Ohmmeter Position #7.546 k Ω +3 k= Ohms 54

55 Ohmmeter Position # k Ω 55

56 Ohmmeter Position # k Ω +3 k= 10 14,850 Ohms 56

57 Ohmmeter Position #9.983 k Ω 57

58 Ohmmeter Position #9.983 k Ω +3 k= Ohms 58

59 Ohmmeter Position # k Ω 59

60 Ohmmeter Position # k Ω +3 k= 10 3,293 Ohms 60

61 Ohmmeter Good 30 Amp Relay, Checking Coil Resistance V R = I =.12 61

62 Ohmmeter Open Coil 30 Amp Relay 62

63 Ohmmeter Shorted Coil 30 Amp Relay

64 Ohmmeter Good 30 Amp Relay V R GOOD = = I = SHORTED.23 64

65 Ohmmeter Test The Normal Closed Contacts 30 Amp Relay 65

66 Ohmmeter Test The Normal Closed Contacts 30 Amp Relay 66

67 Ohmmeter Only Measures Resistance 67

68 Diode Check Electrical One-Way Check Value 68

69 Diode Testing Digital Multimeter MUST Be Set to Test Diode Press Mode Until You See Diode Symbol Must Provide Enough Voltage to Forward Bias Diode 69

70 Diode Testing Current Can t Flow This Direction 70

71 Diode Testing Current Flows This Direction.3 to.6 Voltage Drop 71

72 Diode Testing Open 72

73 Diode Testing Shorted 73

74 Diode Testing Continuity Test (beeps) If all but one of the strands are broken it will still show continuity. It will not handle the current load. 74

75 Meter Cheat Sheet 75

76 Questions & Answers

77 Thank you!

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