The answer to this question depends on the load on the devices:
Under heavy load (every day in multi-shift operation) the device should be checked and calibrated at least once a year
Under less severe stress, this cycle can be extended at once in two years
This calibration does not replace a regular check or the update / upgrade by the manufacturer. In addition, it says nothing about the condition of the device. It reproduces only a snapshot of the measuring systems of the device at a certain point in time.
A simple protocol is possible via the serial interface RS232 "Serial 2". The device can be set in such a way that a result telegram is sent here after each measurement. The telegrams can be recorded with a simple printer or a terminal program. In addition, it is possible to record and evaluate the data as curves and / or data records with the APT software PMF01-ANALYZE.
For a detailed description, refer to the device documentation.