What two parameters should be checked using a multimeter when troubleshooting a transmitter with an RTD?

When troubleshooting a transmitter with a Resistance Temperature Detector (RTD), it is essential to check both the DC voltage and resistance parameters.

Using a multimeter to measure DC voltage helps to determine whether the transmitter is receiving the proper input voltage, which is crucial for its operation. An incorrect supply voltage can lead to malfunction or inaccurate readings.

Measuring resistance is particularly important with an RTD because it operates on the principle of changing resistance with temperature. The resistance of the RTD should correspond to specific temperature values. By checking the resistance, one can verify if the RTD is functioning correctly and is not damaged. If the resistance values do not align with the expected values for the given temperature range, it indicates a potential issue with the RTD itself or its connections.

This combination of checking DC voltage to ensure power supply integrity and measuring resistance to confirm proper RTD functionality provides a comprehensive approach to troubleshooting issues with the transmitter.