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electrical troubleshooting

Multimeter Familiarization. All multimeters perform many of the same functions, but may look different.This digital multimeter (DMM) is very similar to those you will use in lab.Let's have a look.. Multimeter Familiarization. This DMM can measure:DC VoltsAC VoltsDC AmpsResistance (Ohms)Continuity w/ alarmDiodesWhat do each of these mean?.

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electrical troubleshooting

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    1: Electrical Troubleshooting Multimeter Techniques

    3: Multimeter Familiarization This DMM can measure: DC Volts AC Volts DC Amps Resistance (Ohms) Continuity w/ alarm Diodes What do each of these mean?

    4: Volts - Amps - Resistance Volts - A measure of electrical pressure. Very similar to water pressure. (psi) Amperes - (Amps) A measure of electrical current flow. Very similar to water flow. (gpm) Resistance - (Ohms) Resistance to flow of electrons Very similar to friction loss in water systems.

    5: Ohm’s Law

    6: DC Volts Direct Current Voltage: Current flows one direction Ex. Current created by a battery. Meter is in parallel to the circuit. Selecting the correct scale. Selecting the correct terminal.

    7: AC Voltage Alternating Current Voltage: Current flows from positive to negative Ex. Current in a house. Meter is in parallel to the circuit. Selecting the correct scale. Selecting the correct terminal.

    8: Resistance (Ohms) Ohms: How much resistance is there to current flow? Is there a poor connection or no connection? High resistance *Current MUST NOT be present. Make sure the juice is off! Selecting the correct scale. Selecting the correct terminal.

    9: Continuity Alarm Continuity: Very closely related to resistance. Only measures if there is a connection. Does not measure the degree to which a connection is made or the amount of resistance that exists. Alarm sounds if continuity exists.

    10: DC Amperes Direct Current Amperage: DO NOT use with AC! DO NOT use over rated amperage in DC! Used in Series with a circuit. This means all current in the circuit must travel through the meter! Selecting the correct scale. Selecting the correct terminal.

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