１　测量方法及原理框图用标准厚度片按仪器规定的校准方法将仪器校准，然后在测量范围内均布３～５个点为受检点，选择相应厚度及精度的厚度片Ｈｉ（ｉ＝１，２，３，…５）依次检定，示值误差按下式计算：δ＝ｈｉ－Ｈｉ式中　ｈｉ—该测量点示值；Ｈｉ—标准厚度片值。２　 A measuring method and block diagram of the standard thickness of the instrument according to the provisions of the calibration method of the instrument calibration, and then in the measurement range uniform 3 to 5 points for the test point, select the appropriate thickness and accuracy of the thickness of piece Hi (i = 1 , 2, 3, ... 5) in turn, the error of indication is calculated as follows: δ = hi-Hi where hi is the indication of this measuring point; 2