Research on the calibration method of a soft vernier caliper
The current effective national standard GB/T21389-2008"Vernier,dial and digital display calipers"only contains traditional dial and digital display calipers,but there is a new form of soft vernier calipers in the measurement industry is widely used.Soft vernier calipers are mainly used in the construc-tion industry to measure the diameter or length of prestressed steel tube concrete pipe and large pipe.At present,the metrological verification regulation JJG 30-2012"Current Calipers"only includes the veri-fication method of traditional style calipers,but it is not applicable to the calibration of soft vernier cali-pers.In this paper,a calibration method for soft vernier calipers is proposed,and the uncertainty analy-sis of the calibration results is carried out to solve the problem of untraceable soft vernier calipers.
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