Module calibration 

Calibration formulas stored with archived channel data.

Calibrations come from the calibrations map in the dashboard sensor settings. The archiver writes the channel’s CalibrationSpec as JSON into each Parquet file’s key-value metadata under the key calibration. The exporter reads that metadata back and applies the formula while generating CSV rows, so an export uses the calibration that was in force when the file was written.

The JSON shape is the formula’s fields plus an optional id and an optional unit, tagged by type:

{"type":"identity"}
{"type":"linear","a":70.1,"b":-8.1,"unit":"kPa"}
{"id":"tp3505","type":"linear","a":2.0,"b":-1.0}
{"type":"polynomial","coeffs":[0.1,2.0,0.03],"unit":"µε"}

Structs

CalibrationSpec

Calibration definition for one channel.

Enums

CalibrationFormula

Formula used to convert a raw LabJack reading into a calibrated value.