Which instrument would you use to verify the voltage output of a temperature sensor that generates millivolt-level signals?

Which instrument would you use to verify the voltage output of a temperature sensor that generates millivolt-level signals?

• A. Voltmeter
• B. Ammeter
• C. Ohmmeter
• D. Wattmeter

Answer: (A)

Measuring a voltage signal directly is the job of a voltmeter. When a temperature sensor outputs millivolts, you want a device with high input impedance so the meter doesn’t load the sensor and alter the reading. A voltmeter (or a multimeter set to the volt setting) can read those small voltages across the sensor terminals, letting you verify the output against the expected value. The other instruments measure different quantities: an ammeter checks current, not voltage; an ohmmeter measures resistance; a wattmeter measures power. Each is useful in its own context, but not for confirming the sensor’s voltage output.

Measuring a voltage signal directly is the job of a voltmeter. When a temperature sensor outputs millivolts, you want a device with high input impedance so the meter doesn’t load the sensor and alter the reading. A voltmeter (or a multimeter set to the volt setting) can read those small voltages across the sensor terminals, letting you verify the output against the expected value.

The other instruments measure different quantities: an ammeter checks current, not voltage; an ohmmeter measures resistance; a wattmeter measures power. Each is useful in its own context, but not for confirming the sensor’s voltage output.