HVACR317 - Refrigeration Meters.

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Presentation transcript:

HVACR317 - Refrigeration Meters

Electrical Multimeter Test Instruments

Analog and Digital Meters VOM multimeters measure resistance, voltage, current Analog Meter Digital Meter

Voltage Measurement To measure voltage: set the leads, position the selector, and set the range. ALWAYS measure voltage across the load or the source.

Voltage Measurement To measure voltage: set the leads, position the selector, and set the range. ALWAYS measure voltage across the load or the source.

Resistance Measurement To Measure resistance: set the leads, position the selector, and set the range. ALWAYS measure resistance across the load, DISCONNECTED from the power source.

Resistance Measurement ALWAYS measure resistance across the load, DISCONNECTED from the power source.

Current Measurement To measure current: set the leads, position the selector, and set the range. Measure current in series, with the load CONNECTED to the power source.

Current Measurement ALWAYS measure current in series with the load CONNECTED to the power source.

Clamp-on Amp Meters

Clamp-on Amp Meters Clamp around the conductor

Motor Winding Measurement Megohmmeters (“Meggers”) measure motor windings.