Method for calibration of milk meters in a milking system

A method for calibrating at least one milk meter in a milking system comprising at least one milking station having at least one milk meter that measures at least one value of a parameter that corresponds to milking performance of a milking animal, said milking station is accessible to a herd of milking animals, said method comprising the steps of:

• determining an internal or external reference value (RV) which reflects an amount of milk received from a plurality of milking animals during a selected time period in a reference unit,
• retrieving all measured values during a selected time period for said at least one milk meter that by itself contribute to the amount of milk received by said reference unit,
• comparing said reference value (RV) with a sum of all retrieved measured values and calculating a correction function for at least one of said milk meters which has been determined to be in a condition to cause errors in measurement, and therefore to be in need of a calibration, and
• calibrating said at least one of said milk meters by using said calculated correction function to adjust the measured value from said at least one milk meter.