When a 4-20 mA loop reads 3.8 mA instead of the expected value, which steps should you take to troubleshoot?

When a 4-20 mA loop reads 3.8 mA instead of the expected value, which steps should you take to troubleshoot?

• A. Increase loop power supply to maximum.
• B. Disconnect the loop and measure voltage.
• C. Check transmitter zero/span, measure loop power supply, verify correct wiring, inspect for short or high resistance, and check for fault status.
• D. Replace the transmitter and ignore wiring.

Answer: (D)