How should a thermistor be tested for performance?

Testing a thermistor for performance is primarily done by checking its resistance with a digital meter and comparing the measured resistance to a reference chart that indicates the expected resistance values at various temperatures. This method is effective because the resistance of a thermistor varies significantly with temperature. The chart provides a benchmark for what resistance values should be measured at known temperatures, allowing a technician to determine if the thermistor is functioning properly.

Using a digital meter provides accurate, real-time resistance readings, which facilitates the comparison with the expected values on the chart. A significant deviation from these expected values could indicate a malfunctioning thermistor that needs to be replaced.

This approach is reliable and standard practice in the industry for ensuring that thermistors operate within their specified limits, providing necessary feedback for temperature-dependent applications in commercial food equipment. Other options, while possibly relevant to certain aspects of electrical testing, do not specifically measure the thermistor's performance in the context required for proper operation in its intended application.