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ADT490 Metering Techniques Introduction ‣ Alarms ALS390 ‣ Foundation for Troubleshooting 2 Concept Review ‣ Current ‣ Voltage 3 Concept Review - Conductors ‣ Conductor resistance is American Wire Gage 4 Concept Review - Resistance ‣ ‣ Depends Primarily on ‣ ‣ ‣ Length Cross-sectional area Type of Material Conductors DO have Resistance 5 Concept Review - Resistor ‣ Limit Current / Divide Voltage / Convert Energy ‣ Ohms & Watts 6 Series DC Circuits ‣ Current same / Voltage divided between Resistors 7 Series DC Circuits - Resistance 8 Kirchhoffs Voltage Law - 9 Voltage Dividers 10 Parallel DC Circuits ‣ Voltage in each parallel branch is equal 11 Kirchhoff’s Current Law • For each Junction: Current in = Current out 12 Resistance in Parallel 13 Resistance in Parallel - Rules ‣ RT always < value of smallest resistor ‣ If largest resistor many times smaller resistor ‣ RT approaches value of smallest resistor. ‣ If two resistors equal ‣ RT is half original resistance 14 Current Dividers 15 AC Voltage & Current 16 AC Voltage & Current Text 17 Measuring with a Multimeter 18 Using a Voltmeter 19 Using a Voltmeter 20 Using a Voltmeter ‣ Can use a voltmeter to check a fuse - SAFER 21 AC Versus DC ‣ No reading ‣ ‣ CHECK METER Power on circuit 22 AC Versus DC 23 Using an Ammeter 24 Using an Ammeter 25 Using an Ammeter ‣ Fuse in circuit - 0 A fuse good, ? A fuse bac ‣ Watch the meter raing 26 Measuring Resistance ‣ Voltage impacts on reading - Nonsense Reading ‣ Highest to Lowest - Lowest most accurate 27 Ohmmeter Uses ‣ Check if EOL is Capacitor - Short then Charge ‣ Determine device polarity 28 End of Presentation 29