ADT490 Metering Techniques. 2 Introduction ‣ Alarms ALS390 ‣ Foundation for Troubleshooting.

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Presentation transcript:

ADT490 Metering Techniques

2 Introduction ‣ Alarms ALS390 ‣ Foundation for Troubleshooting

3 Concept Review ‣ Current ‣ Voltage 3

4 Concept Review - Conductors ‣ Conductor resistance is American Wire Gage 4

5 Concept Review - Resistance ‣ Depends Primarily on ‣ Length ‣ Cross-sectional area ‣ Type of Material ‣ Conductors DO have Resistance 5

6 Concept Review - Resistor ‣ Limit Current / Divide Voltage / Convert Energy ‣ Ohms & Watts 6

7 Series DC Circuits ‣ Current same / Voltage divided between Resistors 7

8 Series DC Circuits - Resistance 8

9 Kirchhoffs Voltage Law 9 -

10 Voltage Dividers 10

11 Parallel DC Circuits ‣ Voltage in each parallel branch is equal 11

12 Kirchhoff’s Current Law For each Junction: Current in = Current out 12

13 Resistance in Parallel 13

14 Resistance in Parallel - Rules ‣ R T always < value of smallest resistor ‣ If largest resistor many times smaller resistor ‣ R T approaches value of smallest resistor. ‣ If two resistors equal ‣ R T is half original resistance 14

15 Current Dividers 15

16 AC Voltage & Current 16

17 AC Voltage & Current 17 Text

18 Measuring with a Multimeter 18

19 Using a Voltmeter 19

20 Using a Voltmeter 20

21 Using a Voltmeter ‣ Can use a voltmeter to check a fuse - SAFER 21

22 AC Versus DC ‣ No reading ‣ CHECK METER ‣ Power on circuit 22

23 AC Versus DC 23

24 Using an Ammeter 24

25 Using an Ammeter 25

26 Using an Ammeter ‣ Fuse in circuit - 0 A fuse good, ? A fuse bac ‣ Watch the meter raing 26

27 Measuring Resistance ‣ Voltage impacts on reading - Nonsense Reading ‣ Highest to Lowest - Lowest most accurate 27

28 Ohmmeter Uses ‣ Check if EOL is Capacitor - Short then Charge ‣ Determine device polarity 28

29 End of Presentation

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