Method of calibrating weights

Method of calibrating weights

1 Overview

The mass comparator is mainly a high-resolution electronic measuring device manufactured based on the principle of measuring the deformation and strain of elastic elements, or the principle of electromagnetic force feedback balance. Its main purpose is to measure the mass difference based on the ABA or ABBA cycle method, and to transfer the mass of the weight. This article takes the calibration of a certain 200g F1 weight as an example, and introduces the method of using a mass comparator to calibrate the weight and the method of evaluating the uncertainty of the result.

2. Calibration method

2.1. Calibration is based on JJG99—2006 (weights" verification regulations

2.2. The weight to be adjusted: F grade 200g

2.3. Calibration steps

2.3.1. Turn on the mass comparator, put the standard weight in the weighing pan of the comparator after preheating and calibrating, and read data A. A takes the arithmetic average of the two readings.

2.3.2. Take off the standard weight, put the weight to be checked with the same nominal weight in the weighing pan, and read the data. Take the arithmetic average of the two readings, and repeat step (2.3.2) to take the arithmetic average of the two readings.

2.3.3. Remove the weight to be checked, put the standard weight in the weighing pan again, and read data A. A takes the arithmetic average of the two readings.

2.3.4. The measurement cycle adopts the ABBA method, and the difference Am between the tested weight and the standard weight is measured.

2.3.5. Repeat the above steps 10 times.