Calibration Inputs
Example Data Table
This sample matches the default form values and is useful for learning the expected calibration structure.
| Load (kg) | Loading Output (mV) | Unloading Output (mV) |
|---|---|---|
| 0 | 0.012 | 0.018 |
| 250 | 5.020 | 5.010 |
| 500 | 10.011 | 10.003 |
| 750 | 15.018 | 15.012 |
| 1000 | 20.027 | 20.030 |
Formula Used
Ideal full-scale output: FSOideal = Rated Sensitivity × Excitation Voltage
Best-fit line: Output = Intercept + Slope × Load
Correction equation: Load = (Measured Output − Intercept) ÷ Slope
Actual sensitivity: Sensitivityactual = FSOactual ÷ Excitation Voltage
Span error: ((FSOactual − FSOideal) ÷ FSOideal) × 100
Non-linearity: Maximum absolute deviation from the best-fit line, expressed as %FS.
Hysteresis: Maximum difference between loading and unloading outputs at the same load, expressed as %FS.
Repeatability: Maximum spread among repeated readings at the same load, expressed as %FS.
RMSE: Root mean square residual of the loading points, expressed as %FS.
These formulas help compare measured bridge output against ideal sensor behavior and create a practical correction model for force or weight conversion.
How to Use This Calculator
- Enter the nominal capacity, engineering unit, excitation voltage, rated sensitivity, and your acceptance tolerance.
- Paste loading calibration points in the format load,output, with one point per line.
- Paste unloading points if you want hysteresis analysis.
- Submit the form to generate regression, correction equation, errors, and plotted response curves.
- Review pass or review status against your tolerance threshold.
- Export the calculated metrics to CSV or PDF for maintenance records, audits, or verification files.
FAQs
1. What does rated sensitivity mean?
Rated sensitivity is the nominal bridge output per volt of excitation at full-scale load. It lets the calculator estimate ideal full-scale output and span error.
2. Why should I enter unloading points?
Unloading data helps estimate hysteresis. A load cell may not follow the exact same path while unloading, so matching points reveal mechanical and elastic lag.
3. What is the correction equation used for?
The correction equation converts measured bridge output into corrected load units. It is useful when system software must compensate for zero shift or span deviation.
4. What does non-linearity tell me?
Non-linearity shows the largest deviation between measured output and the best-fit straight line. Lower values indicate the sensor behaves more linearly across the test range.
5. Why is repeatability sometimes shown as N/A?
Repeatability needs duplicate readings at the same load. If each load level is listed only once, the calculator cannot determine the spread of repeated measurements.
6. Is the overall status a certification result?
No. It is a quick screening result based on your entered tolerance. Formal acceptance should still follow your internal procedure, standard, and traceable calibration method.
7. Should output values be entered in mV or mV/V?
This file expects measured output in mV. Rated sensitivity remains in mV/V, and excitation voltage converts the datasheet value into ideal full-scale millivolts.
8. Can I use units other than kilograms?
Yes. Enter any engineering unit label such as N, lb, ton, or kN. The regression and correction equation will use the same load unit consistently.