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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