Proper testing of a RTD or thermistor can only be done with what kind of meter?

Testing a Resistance Temperature Detector (RTD) or a thermistor requires measuring the resistance of these components accurately to determine their temperature-sensing capabilities. The most suitable tool for this task is a digital ohmmeter.

A digital ohmmeter provides an accurate measurement of resistance, which is essential because the resistance value of an RTD or thermistor changes with temperature. By using a digital ohmmeter, you can easily read precise resistance values, which are crucial for assessing the performance and functionality of these temperature sensors.

In contrast, other options like an analog voltmeter measure voltage rather than resistance, making them unsuitable for this specific testing purpose. A digital ammeter measures current, which is also not applicable when the goal is to determine resistance. Finally, while a standard multimeter can measure resistance, it may not provide the same level of accuracy and precision as a digital ohmmeter, particularly in a professional testing environment.

Thus, employing a digital ohmmeter is the correct choice for ensuring accurate testing of RTDs and thermistors.