Measurement Process Characterization_8

Tham khảo tài liệu 'measurement process characterization_8', kỹ thuật - công nghệ, điện - điện tử phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | . Designs for angle blocks Block sizes Angle blocks normally come in sets of 1 3 5 20 and 30 seconds 1 3 5 20 30 minutes 1 3 5 15 30 45 degrees and blocks of the same nominal size from 4 5 or 6 different sets can be calibrated simultaneously using one of the designs shown in this catalog. Design for 4 angle blocks Design for 5 angle blocks Design for 6 angle blocks Restraint The solution to the calibration design depends on the known value of a reference block which is compared with the test blocks. The reference block is designated as block 1 for the purpose of this discussion. Check standard It is suggested that block 2 be reserved for a check standard that is maintained in the laboratory for quality control purposes. Calibration scheme A calibration scheme developed by Charles Reeve Reeve at the National Institute of Standards and Technology for calibrating customer angle blocks is explained on this page. The reader is encouraged to obtain a copy of the publication for details on the calibration setup and quality control checks for angle block calibrations. Series of measurements for calibrating 4 5 and 6 angle blocks simultaneously For all of the designs the measurements are made in groups of seven starting with the measurements of blocks in the following order 2-3-2-1-2-4-2. Schematically the calibration design is completed by counter-clockwise rotation of the test blocks about the reference block one-at-a-time with 7 readings for each series reduced to 3 difference measurements. For n angle blocks including the reference block this amounts to n -1 series of 7 readings. The series for 4 5 and 6 angle blocks are shown below. Measurements for 4 angle blocks Series 1 2-3-2-1-2-4-2 Series 2 4-2-4-1-4-3-4 Series 3 3-4-3-1-3-2-3 http div898 handbook mpc section3 2 of 6 5 1 2006 10 12 18 AM . Designs for angle blocks Measurements for 5 angle blocks see diagram Series 1 2-3-2-1-2-4-2 Series 2 5-2-5-1-5-3-5 Series 3 .

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