A calibration curve is a graph created during calibration that links the reading of a measuring instrument to the true reference value. It makes an instrument’s deviations visible and correctable.
How does it work?
To create a calibration curve, you measure a series of known reference values with the instrument. The deviation between the reading and the true value is plotted on a graph. That graph is then used to correct later measurements.
The main steps:
- Present known reference values to the instrument.
- Record what the instrument reads for each reference value.
- Plot the deviation on a graph: the calibration curve.
- Use the graph to correct later measurements.
Application in construction
In construction, the calibration curve is used when calibrating measuring and testing equipment, such as:
- Moisture meters
- Load cells (force transducers)
- Cone penetration test equipment
- Weighing scales
Without a valid calibration, measurement results cannot be trusted. A correct calibration curve is therefore the basis for reliable measurements and tests.
Related terms
- Vernier scale
- Spirit level
- Distance meter
- Inclinometer
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