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DESCRIPTION
TRANSCRIPT
© 2008 Snap-on Incorporated; All Rights Reserved
2
Training
for
Digital Multi-Meter (DMM)
or
Digital Volt Ohm Meter (DVOM)
3© 2009 Snap-on Incorporated; All Rights Reserved 3
Course Objectives• This module covers:
– Digital Multi Meter (DMM) basic sections & use
– Push-buttons terms and uses
– Display readings and symbol locations
– Rotary Dial function symbol definitions
– Terminal test lead symbols and hook ups
– Basic applications
44
Completed Course Outcome• When you complete this module, you will understand:
– settings on the meter
– meter display readings
– importance of proper terminal connections
– basic electrical testing with the meter
© 2009 Snap-on Incorporated; All Rights Reserved
5
Digital Multi Meter - Introduction
What do DMMs do for us?
• Converts Electrical Signals to Understandable Values
• Perform highly accurate measurements
• Assist in electrical equation calculations
• Enable testing of sensitive circuits
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6
Digital Multi Meter - Introduction (con’t)
DMM’s Convert Electrical Signals to Understandable Values
– Converts 2 Types of Electrical Signals
– Rapid electrical pulse conditions • Hard to see - display changes too quickly
– Utilize Min/Max function to help capture data
– Steady state conditions• Slow changing or constant signals
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7
DMM’s Perform Highly Accurate Measurements
• digital devices are very accurate
– capture tiny units of measurement
• analog meters (needle reading displays) are not as accurate
– reading based on individual’s subjective view
– cannot display these tiny measurements
7
Digital Multi Meter - Introduction (con’t)
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8
Digital Multi Meter - Introduction (con’t)
DMM’s Assist in Electrical Equation Calculations
• Ohm’s law equation E (voltage) = I (current) x R (resistance)
– Dial settings select one or more equation elements
– Display value helps to solve for a missing value
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9
DMM’s Work Safely on Sensitive Circuits
• High Impedance (or high resistance)
Impedance Definition = opposition to the flow of current
– Minimizes draw from a device or circuit being tested
– Reduces the chance computer circuitry damage
9
Digital Multi Meter - Introduction (con’t)
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10
Digital Multi Meter - Basics
• Four Basic Sections
10
Digital Display
Push-button Functions
Rotary Dial Function Selector
Test Lead Terminals
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11
Digital Multi Meter - Display• Digital Display Readings and Locations on Start-up
11
Voltage Type AC or DC
Low Battery - symbol will appear only when power is low
Auto Range/Manual Range
Analog Bar Graph Display of the Selected Value
Auto Power Off
Dial Setting Icon Reference Area
Auto Ranging on Start-up
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12
Auto/Manual Range Display
12
• Important to Understand 2 Range Options – Auto Range
– Manual Range
Auto Ranging Manual Ranging
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13
Digital Multi Meter – Auto Range Display
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AUTO Ranging
Auto Ranging Displayed on Start-up
• Auto Ranging Auto Ranging Advantages
• activated on start-up
• moves decimal automatically
• good for slow changing signals
display location - AUTO symbol
Auto Ranging Disadvantages
• can set improper range
• over-ranging signal requires adjustment
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14
Digital Multi Meter – Manual Range Display
14
Manual Ranging
Manual Range Activated via RANGE Button
• Manual RangeManual Range Advantages
• RANGE activated on demand
• moves decimal point on display
• stabilizes rapidly changing signals
• can convert OL readings to values
▪Manual Ranging Button
• Press until desired decimal value is reached
▪
display location - no symbol
Manual Range Disadvantages
• operator must understand and determine proper range
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15
Digital Multi Meter – Push-buttons• DMM Push-buttons Features Enhance Dial Functions
15
HOLD freezes a value on the display - second press removes the hold
going back to a live value
RANGE toggles between Auto Ranging or
Manual Ranging
AC/DC toggles between
AC (Alternating Current) or
DC (Direct Current)
Continuity Buzzer - checks circuits for opens, shorts, broken wires loose fuses, etc.
Diode - tests diodes, LED’s etc.
REC activates recording of MIN (minimum) and
MAX (maximum) values
Hz/DUTY toggles between Hertz (Frequency)
or Duty Cycle on ACV, ACA, or Hz
REL activates Relative Mode - sets display to zero - factors out undesired readings
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16
Digital Multi Meter – Rotary Dial
16
• DMM Rotary Dial Symbol Definitions
Ohms (or resistance) toggle to Continuity
or Diode Test
AC or DC selectable milliVolts
AC Volts
OFF meter is not active
DC Volts
40 micro amps max. current setting -
measures tiny current draw in DC
CAPACITANCE measures start up
capacitors
HERTZ frequency measurements
4000 micro amps max. current setting selectable AC or DC for very low
current draw
400 milli Amp max. current setting selectable
AC or DC for low current draw
10 Amp max. current setting selectable AC or DC
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17
Digital Multi Meter - Terminals
17
• DMM - Test Lead Terminal Symbols
Amps red lead connection 10 Amp fused terminal
micro& milli Amps red lead connection 400 milli
Amp ½ amp fused terminal
COMMON black lead
connection used for most measurements
Volts/OHMS/Hertz red lead
connection used for Voltage, OHMS(resistance)
Diode Test, Continuity, Hertz (frequency) and
Capacitance
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18
1. What do the abbreviations DMM and DVOM mean?
2. What are the 4 main sections of a Digital Multi-Meter ?
3. What are two types of ranging?
4. How do the button functions expand the meter capabilities
5. What is the function of the rotary dial?
6. How many test lead terminal ports are there?
Review for Understanding
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19
Digital Multi Meter – Set-up & Use• Using Our New Knowledge of:
• Display Readings and Locations• Push Button Features• Rotary Dial Symbol Definitions• Test Lead Terminal Symbols
» We Can Move on to
» Button Functions
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20
Digital Multi Meter – Button Functions
20
Button Functions Enhance the Dial Settings• Change from Auto to Manual Ranging
• Record Readings
• Enable Frequency or Duty Cycle
• Filter or Zero Out Input
• Convert from AC to DC readings
• Allow Continuity or Diode Functions
• Hold an important reading
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21
Digital Multi Meter – RANGE Button
RANGE
21
• Changes Meter from Auto-Ranging to Manual-Ranging
• Moves Decimal Point for Improved Reading
• Good for rapidly changing signals
• Adjusts Over Loaded (OL) signals to be readable values
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2222
Use with Rotary Dial Settings
RANGE
RANGE Button
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23
Digital Multi Meter – RECORD Button
REC
23
• Record captures two extreme readings
• MAX - top or maximum reading
• MIN - low or minimum reading
• Use for Rapidly Changing signals
• Starter draw, voltage drop, etc.
• Used with Rotary dial Settings
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2424
Use with Rotary Dial Settings
REC
RECORD Button
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25
Digital Multi Meter – Hz/DUTY Cycle Button
Hz/Duty
25
• Check Frequency or HERTZ (Hz)
• How many times per second a signal happens
• simple 8 cycles per second example
• Check Duty Cycle (%)
• Percent of time signal is on
• simple example of duty cycle
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2626
Use with Rotary Dial Settings
Hz/Duty
Hz/DUTY Cycle Button
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27
Digital Multi Meter – REL Relative Button
REL
27
• Factors Out Lead Resistance on Sensitive Readings
• Zero’s the display if desired
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Use with Rotary Dial Settings
REL
REL Relative Button
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29
Digital Multi Meter – AC/DC Button
AC/DC
29
• Changes from Direct to Alternating Current Settings
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Use with Rotary Dial Settings
AC/DC
AC/DC Button
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31
Digital Multi Meter – Continuity/Diode Button
31
• Adds 2 Functions to Ω (Ohms) Setting
• Continuity
• tests circuits for breaks or loose circuit connections
• Diode Testing
• tests electronic components such as diodes, LED’s etc.
/
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3232
Use with Rotary Dial Setting
/
Continuity/Diode Button
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33
Digital Multi Meter – Data HOLD Button
HOLD
33
• Locks in Reading
• Allows Display to go back to Live Reading
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3434
Use with Rotary Dial Settings
HOLD
Data HOLD Button
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1. What display symbol does the RANGE button change?
2. What are the two display terms the RECORD button displays?
3. What does the Ω symbol represent?
4. What does the symbol represent?
5. What does the symbol represent?
6. HOLD button freezes reading. How do you get back to a live reading?
Review for Understanding
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36
Digital Multi Meter – Set-up & Use• Moving on to:
• Testing the Test Leads
• Testing Fuses
• Meter Set-up with Simulator Board
• Rotary Dial Settings
• Actual Reading
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37
Diode Setting - Test Lead Safety Test
37
• Always Test for Good Leads Before Using a Meter1. Insert red lead into VΩHz terminal
2. Insert black lead into COM terminal
3. Rotate the Dial setting to Ω (Ohms)
4. Press the / Continuity/Diode button once
5. Use the alligator clips. Clip red & black lead together
6. Sound signal means leads should be good
7. Move wires around – intermittent sound could mean broken wires
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3838
• Always Test for Good Fuses Before Using a Meter1. Put the red lead terminal into the VΩHz terminal – no black lead
2. Move the Rotary Dial to Ω (Ohms)
3. Press the / button twice to Diode test
4. Remove protective tips from the prod ends
5. Touch the red lead to metal inside the & terminals – Any numeric value including 0.000 indicates good fuse
– Any non-numeric value including OL indicates bad fuse
6. Fuses located in back of meter
A mAµA
Diode Setting - Fuse Safety Test
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39
Fuse Replacement
39
• If a Bad Fuse is Detected1. Remove the Protective Boot
2. Turn the Meter with Back Facing Up
3. Unscrew 3 Lower Screws
4. Remove the Protective Cover
5. Locate Bad Fuse • 10A
• .5A
6. Replace with original style fuses
7. Reassemble in reverse order
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40
1. Should test leads always be tested before using the meter?
2. Should fuses be tested every time before using the meter?
3. For testing the fuses insert the red lead terminal into which meter terminal?
4. For testing the fuses, after inserting the red lead terminal which two other terminals should the prod end be inserted?
5. What values indicate a good fuse?
6. What values indicate a bad fuse?
Review for Understanding
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41
Signal Generator IntroductionSignal Generator (EESX306A) will be used extensively for tests
41© 2009 Snap-on Incorporated; All Rights Reserved
42
Signal Generator Introduction
• 5 Main Areas
1. ON/OFF Button a) ON indicator light
2. Battery Terminals
3. Center Switches (2)
4. Center Dials (3)
5. Test Lead Terminal Posts (7)
42
#1 #2 #3 #4 #5 #6
Switches set to
the left
A B C
#7
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43
DMM Test Selections
Test Procedure - Outline (most of the following cases)
1. Settings and Terminal Locations
1. Instructions for Conducting the Tests
1. Simulator Board Diagram
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44
Digital Multi Meter – DC Volts
44
Display
DC Volts
Rotary Dial
DC VoltsTerminal
VHzBlack lead Red lead
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45
Digital Multi Meter – DC Volts Test• Using a 9 volt battery (from the signal generator)
– Connect the red lead to the (+) positive terminal (use alligator clips)
– Connect the black lead to the (–) negative terminal use (alligator clips)
• Refer to the display reading– A reading of 9.0 or above indicates a good battery
– A lower reading indicates a marginal or bad batteryNOTE: If the battery displays low voltage, then, install a good battery (test the
new battery per the above to be sure it has proper voltage)
• Install the battery in the Simulator
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46
INSTALL 9 volt
battery
#1 #2 #3 #4 #5 #6
A B C
Switches set to the
left
Dials – black knobs
Test Lead Posts
On/Off button
Signal Generator Now Ready for Tests
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47
Digital Multi Meter – AC Volts
Display
AC Volts
47
Rotary Dial
AC VoltsTerminal
VHzBlack lead Red lead
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48
Digital Multi Meter – AC Volts
• How to run the test
48
• Using the signal generator – ref next slide1. Connect the red test lead to test lead port #5
2. Connect the black test lead to test lead port #6 (ground)
3. Move the Rotary Dial to AC Volts
4. Turn the simulator ON (press on/off button)
5. Rotate the middle dial
6. Watch the meter display for value changes
• This completes the AC Volt Test
B
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49
#5 #6
Switches set to the
left
4th Rotate middle
dial (B)
2nd Attach Black
Test Lead (ground)
3rd Push button to ON. Red light goes on. 1st Attach
Red Test Lead
B
Signal Generator Set-up Steps for AC volts
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50
Digital Multi Meter – AC millivolts
50
Display
AC milliVolts
Rotary Dial
AC milliVoltsTerminal
VHzBlack lead Red lead
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51
Digital Multi Meter – AC millivolts
• Test
51
• Using the signal generator1. Connect the red test lead to test lead port #5
2. Connect the black test lead to test lead port #6 (ground)
3. Move the Rotary Dial to AC/DC milli Volts
4. Press the AC/DC button
5. Turn the simulator ON (press on/off button)
6. Rotate the middle dial
7. Watch the meter display for value changes (auto ranges to V)
This Completes the AC milliVolt Test
B
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52
#5 #6
Switches set to the
left
4th Rotate middle
dial (B)
2nd Attach Black
Test Lead (ground)
3rd Push button to ON. Red light goes on. 1st Attach
Red Test Lead
B
Signal Generator Set-up Steps for AC milliVolts
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53
Digital Multi Meter – DC milliVolts
53
Display
DC milliVolts
Rotary Dial
DC milliVoltsTerminal
VHzBlack lead Red lead
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54
Digital Multi Meter – DC millivolts
54
• Using the signal generator1. Connect the red test lead to test lead port #4
2. Connect the black test lead to test lead port #6 (ground)
3. Move the Rotary Dial to AC/DC milli Volts
4. Turn the simulator ON (press on/off button)
5. Rotate the right dial
6. Watch the meter display and bar graph values change
This Completes the DC milliVolt Test
C
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55
#4 #6
Switches set to the
left
4th Rotate right dial
(C)
2nd Attach Black
Test Lead (ground)
3rd Push button to ON. Red light goes on. 1st Attach
Red Test Lead
C
Signal Generator Set-up Steps for DC milliVolts
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56
Ohms Units of Measure for next demo
56
1. = ohms
– display shows exact resistance in ohms – Example: If 50 is shown on the display = 50 ohms
2. k = kiliohms (ohms x 1,000) – displays k symbol on right side of value
– Example: If 50 k is shown on the display = 50,000 ohms
3. M = megohms (ohms times 1,000,000)– displays M symbol on the right side of value– Example: If 50 M is shown on display = 50,000,000 ohms
© 2009 Snap-on Incorporated; All Rights Reserved
57
Digital Multi Meter – Ohms (resistance)
57
Display
Ohms
Rotary Dial Ohms/Continuity//Diode
Terminal
VHzBlack lead Red lead
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58
Digital Multi Meter – Ohms (resistance)
58
• Using the signal generator1. Remove the 9 volt battery from the signal generator
2. Connect the black test lead to test lead port #6 (use alligator clip)
3. Move the Rotary Dial to Ohms
4. Touch the red test lead to test lead ports #1, #2, #3, #4, #5– Which has the highest resistance?– Which has the lowest resistance– Which indicates an Open Circuit?
This Completes the Ohms Test
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59
#1 #2 #4 #6
Switches set to the
left
2nd Attach Black
Test Lead to #6 (ground)
3rd Touch Red Test
Lead to all 5 Test Lead Posts
Signal Generator Set- Ohms (resistance)
#3 #5
1st Remove
9 volt battery
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60
Digital Multi Meter – Ω Ohms (resistance)
60
Alternative Ohms Test• Using a fuel injector (not supplied)
1. Connect or insert the red test prod to one terminal
2. Connect the black test prod to the other terminal
3. Move the Rotary Dial to Ω (Ohms)
4. Watch the meter display values
This Completes the alternative Ω - Ohms Test
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61
Digital Multi Meter – Continuity
61
Display
Continuity
Rotary Dial Ohms/Continuity/Diode
Terminal
VHzBlack lead Red lead
Press / button once
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62
Digital Multi Meter – Continuity
62
• Using the signal generator1. Remove the 9 volt battery from the signal generator 2. Connect the black test lead to test lead port #6 (use alligator clip)
3. Move rotary dial to to Ω (Ohms)
4. Press / button once
5. Touch the red test lead to test lead #7
6. Listen for Continuity buzzer – good circuit
This Completes the Continuity Test
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63
#6
Switches set to the
left
2nd Attach Black
Test Lead (ground)
3rd Touch Red Test
Lead to #7 Ground
Signal Generator Set - Continuity
1st Remove
9 volt battery
#7
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64
Digital Multi Meter – Continuity
64
Alternative Continuity Test• Using the test leads with alligator clips
1. Move the Rotary Dial to Ω (Ohms)
2. Press the / Continuity/Diode button once 3. Connect red test to the black test lead (use alligator clips)
4. Listen for continuity buzzer – move the leads around to test for wire breaks
– Buzzer indicates a good circuit – good leads– NO buzzer bad leads or bad circuit
This Completes the Alternative Continuity Test
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65
Digital Multi Meter – Diode Test
65
Display Diode
Rotary Dial Ohms/Continuity/Diode
Terminal
VHzBlack lead Red lead
Press / button twice
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66
Digital Multi Meter – Diode Test
66
• Using a Diode or Diode Simulator (diode not included) 1. Move the Rotary Dial to Ω (Ohms)
2. Press the / Continuity/Diode button twice
3. Touch the red lead to one end of the diode terminal leg
4. Touch the black lead to other end of the diode terminal leg
5. Now reverse the red and black leads on the diode legs
6. OL will show on one test of the diode, a numeric value on the other
7. Good diode - allows flow in one direction only
8. Bad diodes - no reading or numeric reading on both sides
This Completes the Diode Test
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67
Digital Multi Meter – DC 40 microAmps
67
Rotary Dial
40µA
Terminal
mAµARed lead Black lead
Display µA
(DC micro Amps only)
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68
Digital Multi Meter - DC 40 microAmps
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• No test on this small unit of measure at this time– Used to test
• Heating flame sensors• Latest micro sensor technology on vehicles
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Digital Multi Meter – DC 4000+ microAmps
69
Rotary Dial
µA
Terminal
mAµARed lead Black lead
Display µA
Simulator test only – Use
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70
Digital Multi Meter – DC 4000+ microAmps
70
• Using the signal generator1. Remove the 9 volt battery from the signal generator
2. Re-install battery attaching only the Negative (-) terminal
3. Connect the red test lead to Positive (+) battery terminal
4. Connect the black test lead to Positive (+) battery board terminal
5. Move the Rotary Dial to µA
6. Check the Display Reading – note the decimal position
This Completes the microAmps Test
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71
Switches set to the
left
3d Attach Black
Test Lead to + battery board
terminal
1st Attach
Battery to only the (–)
negative terminal
Signal Generator Set-up - DC 4000+ microAmps (µA)
4th Turn Rotary Dial
to µA position and read the
Display
2nd
Attach Red Test Lead to + Battery
Terminal
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72
Digital Multi Meter–AC microAmps (4000 micro amps)
72
Rotary Dial
µA
Terminal
mAµARed lead Black lead
Display µA
AC
Press AC/DC button once
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73
Digital Multi Meter AC 4000microAmps
73
• No test on this setting at this time
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74
Digital Multi Meter – DC milliAmps
74
Rotary Dial
mA
Terminal
mAµARed lead Black lead
Display mA
Simulator test only – Use
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75
Digital Multi Meter - DC milliAmps (mA)
75
• Using the signal generator1. Remove the 9 volt battery from the signal generator
2. Re-install battery attaching only the Negative (-) terminal
3. Connect the red test lead to Positive (+) battery terminal
4. Connect the black test lead to Positive (+) battery board terminal
5. Move the Rotary Dial to mA
6. Check the Display Reading – note the decimal position
This Completes the milliAmps Test
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76
Switches set to the
left
3d Attach Black
Test Lead to + battery terminal
1st Attach
Battery to only the (–)
negative terminal
Signal Generator Set-up Steps for DC milliAmps
4th Turn Rotary Dial
to milliAmps position and
read the Display
2nd
Attach Red Test
Lead
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77
Digital Multi Meter – AC milliAmps
77
Rotary Dial
mA
Terminal
mAµARed lead Black lead
Display mA
AC
Press AC/DC button once
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78
Digital Multi Meter – AC milliAmps
78
• No test on this setting at this time
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79
Digital Multi Meter – DC Amps
79
Rotary Dial
A
Terminal
ARed lead Black lead
Display A
Simulator test only – Use
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80
Digital Multi Meter – DC Amps
80
• Using the signal generator1. Remove the 9 volt battery from the signal generator
2. Reinstall battery attaching only the Negative (-) terminal
3. Connect the red test lead to Positive (+) battery terminal
4. Connect the black test lead to Positive (+) battery board terminal
5. Move the Rotary Dial to A
6. Check the Display Reading – note the decimal position
This Completes the DC Amps Test
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81
Switches set to the
left
3d Attach Black
Test Lead to + battery terminal
1st Attach
Battery to only the (–)
negative terminal
Signal Generator Set-up Steps for DC Amps
4th Turn Rotary Dial
to Amps position and
read the Display
2nd
Attach Red Test Lead to + battery
post
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82
Digital Multi Meter – AC Amps
82
Rotary Dial
A
Terminal
ARed lead Black lead
Display A
Press AC/DC button once
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83
Digital Multi Meter – AC Amps
83
• No test on this setting at this time
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84
Digital Multi Meter – Hertz (frequency)
84
Display
Hz -Hertz
Rotary Dial
Hz - Hertz
Terminal
VHzBlack lead Red lead
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85
Digital Multi Meter – Hertz (frequency)
85
• Using the signal generator1. Connect the red test lead to test lead port #3
2. Connect the black test lead to test lead port #6 (ground)
3. Move the Rotary Dial to Hz (Hertz)
4. Turn the simulator on (press on/off button)
5. Rotate the middle dial
6. Watch the meter display for value changes
This Completes the Hertz Test
B
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86
#3 #6
Switches set to the
left
#4 Dial Rotate middle
dial (B)
#2 Attach Black Test Lead (ground)
#3 Push button to ON. Red light goes on.
#1 Attach Red Test Lead
B
Signal Generator Set-up for Hertz (Hz)
© 2009 Snap-on Incorporated; All Rights Reserved
87
• A capacitor is like a temporary battery– can store electric energy when disconnected from charging circuit
• short term energy storage
– commonly used in electronic devices • maintain power supply while batteries are being changed
• Car audio systems example– stores energy for the amplifier
• sends boosts to speakers when needed
Capacitor – An Energy Storage System
© 2009 Snap-on Incorporated; All Rights Reserved
88
Digital Multi Meter – Capacitance Test
88
Display
microfarads
Rotary Dial
or CAP-Capacitance
Terminal
VHzBlack lead Red lead
CAUTION: Capacitors store energy - wait at least 5 minutes after power down for the Capacitor to discharge on its own
© 2009 Snap-on Incorporated; All Rights Reserved
• Using the signal generator1. Connect the red test lead to test lead port #5
2. Connect the black test lead to test lead port #6 (ground)
3. Move the Rotary Dial to or CAP
4. Turn the simulator ON (press on/off button)
5. Rotate the middle dial
6. Watch the meter display for change values
This Completes the Capacitance Test
Digital Multi Meter – Capacitance Test
B
© 2009 Snap-on Incorporated; All Rights Reserved
#5 #6
Switches set to the
left
#4 Dial Rotate middle
dial (B)
#2 Attach Black Test Lead (ground)
#3 Push button to ON. Red light goes on.
#1 Attach Red Test Lead
B
Signal Generator Set-up - Capacitance
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Digital Multi Meter – Capacitance
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Alternative Capacitance Test• Using a Capacitor (not included)
1. Connect the red lead to positive terminal
2. Connect the black lead to negative terminal (if polarity specific)
3. Move the Rotary Dial to or CAP
4. Wait for reading on display
5. Compare display reading to Capacitor value1. Good Capacitor - reading equal to value on capacitor
This Completes the Capacitance Test
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© 2009 Snap-on Incorporated; All Rights Reserved
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1. When testing for AC Voltage which rotary dial setting is used?
2. Another word for Ohms is ______?
3. Good Continuity is signaled by what?
4. What are the 3 steps in setting up the meter to test Amps?
5. A Capacitor is like a mini _______?
6. What two safety tests can you run before using the meter?
Review for Understanding
© 2009 Snap-on Incorporated; All Rights Reserved
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End of METER Training
© 2009 Snap-on Incorporated; All Rights Reserved