1 HVACR317 - Refrigeration Operating Controls 1 Thermostats Operating Controls 1 Thermostats.
1 HVACR317 - Refrigeration Meters. 2 Electrical Multimeter Test Instruments.
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Transcript of 1 HVACR317 - Refrigeration Meters. 2 Electrical Multimeter Test Instruments.
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Analog and Digital Meters
• VOM multimeters measure resistance, voltage, current
Analog Meter
Digital Meter
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Voltage Measurement
• To measure voltage: set the leads, position the selector, and set the range. ALWAYS measure voltage across the load or the source.
W
VOLTMETER
VOLTMETER
LT-1
9 VDC
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Voltage Measurement
• To measure voltage: set the leads, position the selector, and set the range. ALWAYS measure voltage across the load or the source.
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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.
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Resistance Measurement
• ALWAYS measure resistance across the load, DISCONNECTED from the power source.
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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.
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Current Measurement
• ALWAYS measure current in series with the load CONNECTED to the power source.