Calibration of Rigid Rules

1 Page 1 October 2014 SOP 10 Page 1 of 9 SOP No. 10 Recommended Standard Operating Procedure for Calibration of Rigid Rules 1. Introduction 1.1. Purpose This SOP describes the procedure to be followed for the calibration of rigid... Open at page → 2 Page 2 October 2014 SOP 10 Page 2 of 9 Table 1. Environmental conditions. Temperature Requirements During a Calibration Relative Humidity (%) Lower and upper limits: 18 °C to 22 °C Maximum changes: < ± 1 °C / 24 h and ± 0.5 °C... Open at page → 3 Page 3 October 2014 SOP 10 Page 3 of 9 2.4. Symbols Table 2. Symbols used in this procedure. Symbol Description A, B, C, D Calculated centers of graduations S Standard X Unknown X0L Left edge of zero on unknown X0R Right edge o... Open at page → 4 Page 4 October 2014 SOP 10 Page 4 of 9 “zero” graduation is the end of the rule, only the reading for the end of the rule is taken. 2.5.4. Move the microscope successively to each graduation to be calibrated and record readings... Open at page → 5 Page 5 October 2014 SOP 10 Page 5 of 9 DB XX X RL m , 2 ) (    (3) 3.3. Calculate the differences, d 1, and d 2 between X and S for each scale interval and each trial. (The subscript i is associated with the trial number.) i... Open at page → 6 Page 6 October 2014 SOP 10 Page 6 of 9 enough will be 2, (k = 2), to give an approximate 95 percent level of confidence. See NISTIR 6969, SOP 29 (Standard Operating Procedure for the Assignment of Uncertainty) for the complete... Open at page → 7 Page 7 October 2014 SOP 10 Page 7 of 9 Appendix A Rigid Rule Calibration Data Sheet Date Environmental parameters Metrologist Before After Unc/ability to measure Test No. Temperature °C °C sp in Pressure mmHg mmHg df Humidity %... Open at page → 8 Page 8 October 2014 SOP 10 Page 8 of 9 Form A-2. Worksheet to Reverse the Calibration of the Rigid Rule Standard Nominal Length of Interval (inches) Calculations to be performed Length of Interval (inches) 1 L 1 = C13 – C12 = -... Open at page → 9 Page 9 October 2014 SOP 10 Page 9 of 9 Appendix B Calibration of a Metric Rule Using a Standard Indicating in Inches A. Work with the customer to determine the intervals they wish to have calibrated. Convert those interval to i... Open at page →