Error of instruments with a variable origin of counting

Conclusions

In order to calculate the reading error of instruments in measurements it is necessary to take into account the position of the origin of counting during measurements. With a variable origin of counting the instrument error in measurement is δ_meas=±1.41 δ ₁ , and does not equal, as is at present normally assumed, ±2 δ₁.

For instruments with a variable origin of counting the permissible reading error should not be given in the form of ±δ ₁ , but in the form of 2 δ ₁ . Thus, the specification for the tolerated reading error of indicator hole gauges should be changed.