What you'll learn
**Reported symptom:** The Pt100 channel is over-range and the input card reports a sensor-break diagnostic.
Lab time: ~12 minutes.
Lesson briefing
Pt100 Open Compensation Lead
Reported symptom: The Pt100 channel is over-range and the input card reports a sensor-break diagnostic.
The circuit was commissioned from a known-good drawing. Treat every terminal as suspect, but test from source to load instead of guessing. Use voltage mode on an energised control circuit and continuity only after the simulated circuit is isolated.
Your task
Isolate the channel and compare continuity on the A, B1 and B2 conductors.
Choose the fault category only when the measurements support it.
Hints
A healthy three-wire RTD presents a finite resistance through both B paths.
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This lesson uses 7 placed components on the lab canvas. Components are vendor-neutral (no proprietary trademarks); the wiring rules apply to any equivalent industrial part.
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