Which of the following measurements are made using a multimeter?
The correct answer is C: Voltage and resistance. A multimeter can make voltage and resistance measurements. Multimeters (also called VOMs - Volt-Ohm-Milliammeters) are versatile instruments that combine the functions of voltmeters, ohmmeters, and ammeters. They can measure DC voltage, AC voltage, resistance, and often current. For amateur radio operators, multimeters are the most common test instrument, used for virtually all basic electrical measurements. Understanding what a multimeter can measure helps when selecting test equipment and planning troubleshooting procedures.
Exam Tip
Multimeter = measures voltage and resistance. Think 'M'ultimeter = 'M'easures 'V'oltage and 'R'esistance. Signal strength, noise, impedance, and reactance require specialized RF instruments, not multimeters.
Memory Aid
"Multimeter = measures Voltage and Resistance. Think 'M'ultimeter = 'M'easures 'V'oltage and 'R'esistance. Basic electrical measurements, not RF parameters."
Real-World Application
Your multimeter can measure the voltage of your power supply (13.8 volts DC) and the resistance of a resistor (1000 ohms). However, it cannot measure the signal strength of an RF signal or the impedance of an antenna - those require specialized RF measurement instruments. Multimeters are for basic DC/AC electrical measurements.
Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. Signal strength and noise are RF measurements typically made with specialized instruments like S-meters, spectrum analyzers, or noise figure meters, not multimeters.
Option B: Incorrect. Impedance and reactance are AC/RF measurements requiring specialized instruments like impedance analyzers or antenna analyzers, not basic multimeters.
Option D: Incorrect. Since A and B are wrong, 'all of the above' cannot be correct. Multimeters measure voltage and resistance, not RF parameters.
题目解析
The correct answer is C: Voltage and resistance. A multimeter can make voltage and resistance measurements. Multimeters (also called VOMs - Volt-Ohm-Milliammeters) are versatile instruments that combine the functions of voltmeters, ohmmeters, and ammeters. They can measure DC voltage, AC voltage, resistance, and often current. For amateur radio operators, multimeters are the most common test instrument, used for virtually all basic electrical measurements. Understanding what a multimeter can measure helps when selecting test equipment and planning troubleshooting procedures.
考试技巧
Multimeter = measures voltage and resistance. Think 'M'ultimeter = 'M'easures 'V'oltage and 'R'esistance. Signal strength, noise, impedance, and reactance require specialized RF instruments, not multimeters.
记忆口诀
Multimeter = measures Voltage and Resistance. Think 'M'ultimeter = 'M'easures 'V'oltage and 'R'esistance. Basic electrical measurements, not RF parameters.
实际应用示例
Your multimeter can measure the voltage of your power supply (13.8 volts DC) and the resistance of a resistor (1000 ohms). However, it cannot measure the signal strength of an RF signal or the impedance of an antenna - those require specialized RF measurement instruments. Multimeters are for basic DC/AC electrical measurements.
错误选项分析
Option A: Incorrect. Signal strength and noise are RF measurements typically made with specialized instruments like S-meters, spectrum analyzers, or noise figure meters, not multimeters. Option B: Incorrect. Impedance and reactance are AC/RF measurements requiring specialized instruments like impedance analyzers or antenna analyzers, not basic multimeters. Option D: Incorrect. Since A and B are wrong, 'all of the above' cannot be correct. Multimeters measure voltage and resistance, not RF parameters.
知识点
Multimeters, Voltage measurement, Resistance measurement, Test equipment
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.