A defensible calibration is a chain of evidence: identify the loop, isolate safely, record as-found points, adjust only when required, verify as-left performance and restore the process.
Follow the workflow
Read the tag, engineering range, supply arrangement and PLC input type. Determine whether the transmitter is loop-powered or separately powered and whether the work requires bypasses or process isolation.
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In the lab, set the engineering minimum and maximum to match the example transmitter.
Open the exerciseApply or observe values at 0, 25, 50, 75 and 100% of span where the procedure requires. Record both input reference and output current before making an adjustment. A five-point up/down test can expose hysteresis.
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Use 4, 8, 12, 16 and 20 mA in the scaling challenge and record the expected engineering values.
Open the exercisePercent span equals (mA − 4) ÷ 16. Engineering value equals minimum plus percent span multiplied by engineering span. A 12 mA signal is 50% span, not 60%.
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Run 12 mA on a 0–100 range; the server grader expects 50 engineering units and shows its formula.
Open the exerciseNear-zero current suggests an open loop or lost power. Values below the normal measurement region or above it may be configured fault signals. Do not “calibrate out” a wiring fault.
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Classify live-zero fault regions in the free diagnosis exercise; saving the graded record needs an account.
Open the exerciseCore concepts
The simulator creates a repeatable result; these concepts make that result transferable to real vendor software and supervised practical work.
The valid measurement starts at 4 mA so 0 mA can indicate a broken or unpowered loop.
The difference between maximum and minimum engineering values. A −50 to 150 °C transmitter has a 200 °C span.
A reference standard’s calibration chain and uncertainty must support the required tolerance.
Continue in the workspace
Run the foundation exercise publicly, then use a subscription for advanced challenges, saved configurations, full attempt history, sharing, assigned paths and team reporting.
Related learning surfaces
Competency and practice field guide
Direct answer
The learner can document as-found data, test low, midpoint and high points, separate sensor, transmitter, wiring, input and scaling errors and record as-left evidence.
Written for instrumentation and PLC learners checking transmitter output, loop current, input raw counts and engineering values at controlled points.
Measurement range, units, lower and upper range values, tolerance, loop supply, transmitter, current path, input mode, raw range, scale, reference standard and as-found record.
Known process reference through sensor and transmitter to loop current, input conversion, raw value, scaled engineering tag, display and alarm.
At least low, midpoint and high reference points produce values within the declared tolerance through the complete loop.
3.6 or 21 mA fault indications, open loop, short, reversed polarity, wrong input mode, offset, span error, nonlinear point and restored wiring.
A reference, sensor, transmitter, supply, wiring, current, input, raw conversion, scaling or display mismatch.
The loop restored, as-left results recorded and affected alarms and control functions retested.
Use the procedure-defined points—commonly low, midpoint and high, with additional ascending and descending points when hysteresis or linearity matters.
It is 50% of an ideal 4–20 mA span, but the engineering value also depends on the configured lower and upper range and any nonlinear mapping.