Which approach would you use with a multimeter to diagnose issues in an instrumentation loop?

• A. Only measure DC voltage at the power supply.
• B. Measure supply voltage, continuity, resistance, insulation resistance, and loop current; check for short to ground, verify proper wiring and connections; compare readings to expected values.
• C. Replace all wiring without measurement.
• D. Use the multimeter to measure temperature.

Answer: (B)