Method for calibration of milk meters in a milking system

A method for calibrating at least one milk meter in a milking system (36;40) comprising at least one milking station (10a, 10b;

• 20;
• 30) having at least one milk meter (14a, 14b;
• 21a, 21b, 21c, 21d;
• 31;41a, 41b, 42a, 42b) that measures at least one value of that corresponds to the milking performance of a milking animal, said milking station is accessible to a herd of milking animals, characterised in that said method comprises the steps of:
• determining an internal or external reference value (RV) which reflects the amount of milk received from a number of milking animals during a selected time period in a reference unit (19;32;42a,42b),
• retrieving all measured values during the selected time period for each milk meter (14a, 14b;
• 21a, 21b, 21c, 21d;
• 31;41a, 41b, 42a, 42b) that by itself contribute to the amount of milk received by said reference unit (19;32;42a, 42b),
• comparing said reference value (RV) with the sum of all retrieved measured values and calculating a correction function (C;Ccom) for at least one of said milk meters, and using said calculated correction function to adjust the measured value from said at least one milk meter.