Copyright Goodheart-Willcox Co., Inc. 171 analog meter analog signal analog to digital converter (A/D) audible continuity test automatic ranging digital meter duty cycle infinity megohmmeter meter movement microprocessor noncontact voltage (NCV) phantom voltage scientific notation shunt test lead volt-ohm-milliammeter (VOM) wattmeter Technical Terms 10 How Electric Meters Work 10.1 The Analog Meter 10.1.1 Current Measurement 10.1.2 Voltage Measurement 10.1.3 Resistance Measurement 10.2 The Digital Meter 10.2.1 Reading the Display 10.2.2 Current Measurement 10.2.3 Voltage Measurement 10.2.4 Resistance Measurement 10.3 Additional Multimeter Functions 10.3.1 Audible Continuity Test 10.3.2 Diode Test 10.3.3 Capacitor Test 10.3.4 Frequency and Duty Cycle 10.3.5 Noncontact Voltage (NCV) 10.4 Test Leads 10.5 Specialty Meters 10.6 Specifications 10.7 Features After completing this chapter, you will be able to: • Describe the operation of an analog meter. • Explain the purpose of a shunt. • Discuss meter configurations to measure voltage, current, and resistance. • Describe range settings. • Describe the operation of a digital meter. • Explain how to read digital meter displays. • Explain the digital meter configurations to measure voltage, current, and resistance. • Describe additional built-in digital meter functions. • Describe special function meters. • Explain meter specifications. Chapter Outline Learning Objectives Additional Reading Modern Refrigeration and Air Conditioning, 21st edition 17.1 Electrical Test Equipment Goodheart-Willcox Publisher