> For the complete documentation index, see [llms.txt](https://help.boomerang3.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.boomerang3.com/boomerang-3-calibration-app-manual/calibration-procedure.md).

# Calibration procedure

Calibration of a measuring point is done by collecting a set of its measurements together with the measurements of a precise reference sensor used for comparison. During the calibration, the reference sensor is thermally connected with the measuring point to minimize any temperature difference between two sensors. This is typically achieved by placing both sensors in an aluminum block working as atemperature stabilizer and equalizer.

It is necessary to wait for the temperature of both sensors to settle down before starting the calibration. After the temperatures settle, the measurements from both sensors are registered in parallel with a fixed log period.

The results are then used to calculate a difference between the reference and calibrated sensor. For every pair of readings, a difference between the calibrated and reference sensor is calculated. The differences are then added and divided by the number of reading pairs to obtain an adjustment value.

Basing on the data collected, a calibration certificate is created. This certificate shall be stored for reference. The adjustment value is normally entered as a correction of the calibrated measuring point.

The whole calibration process is usually performed manually which is time consuming and requires a lot of attention and accuracy.

The Calibration App is automating the calibration process, minimizing the manual operations, and increasing the efficiency. It communicates with Boomerang 3 system and reference sensors synchronizing the calibration processes, collects the measurements, calculates the adjustments, prepares the calibration certificates, and stores adjustments and certificates in the system.

The Calibration App connects wirelessly to the reference sensors with Bluetooth BLE, so using them is easy.

Besides fully automated B3 measuring point calibration, the app offers also so-called Manual Calibration mode. This mode can be used to calibrate any temperature sensor with a minimum amount of user effort. It can be used for calibration of e.g., Boomerang 2 temperature sensors.


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