This page can be used to calculate gain and offset corrections to provide a two point linear sensor calibration. It requires sensor readings at two different accurately known values. For instance, a temperature sensor could be calibrated using an ice bath and boiling water.
How to Use the Worksheet
Sensor calibration is done using the Configure I/O tab of the Vesta user interface.
Before taking readings for calibration purposes, set the gain to 1.0 and the offset to 0.0 for the sensor that's being calibrated.
Perform the following steps:
- Place the sensor in the known value medium for the lower value (ice water, for instance)
- Watch the sensor readings using the 'Home' tab. Let the sensor reach a stable reading for the first (lower) known value.
- Enter the actual and reported 'Low' values on this page.
- Place the sensor in the known value medium for the higher value (boiling water, for instance)
- Watch the sensor readings using the 'Home' tab. Let the sensor reach a stable reading for the second (high) known value.
- Enter the actual and reported 'High' values on this page.
- Press the 'Calculate' button.
- Enter the resulting gain and offset values for the sensor on the 'Configure I/O' tab
How to Use Gain and Offset
Gain and offset are factors for correcting raw input to account for inaccuracies and faults in the sensor. Calculated gain and offset values will result in sensor readings that are more accurate that can be achieved with a simple offset correction.
You can enter the gain and offset for a calibrated sensor into the Configure I/O tab of your Vesta user interface. This will make your data and calculations more accurate.
