Calibration Of Measuring Instruments Pdf

Calibration of measuring sensors and instruments.

Calibration of measuring instruments pdf.

When calibration is successfully completed a calibration sticker is affixed to the instrument which contains the date the calibration was completed and the date the instrument is due for recalibration. Values of the measuring instrument used or a measurement standard are compared over one or several stages to this standard. In accordance with the ranking order of the standards from the. Calibration of measuring instruments on a coordinate measuring machine 131 calibration of reference gauge blocks by interferometry u 0 02 µm 0 2 10 6 l substitution measurement on cmm u 1 8 µm 4 10 6 l calibration of gauge rings u 0 4 µm 3 1 10 6 l calibration of thread ring pitch diameter.

At each of these stages calibration with a standard pre viously calibrated with a higher ranking standard is carried out. Measurement standards traceable to international or national measurement standards. The following explains the basic concepts with respect to calibration. Typically the accuracy of the standard should be ten times the accuracy of the measuring device being tested.

However accuracy ratio of 3 1 is acceptable by most standards organizations. 5 1 a record is maintained of all repair and calibration action performed on the instrument. Oppermann is out of print and the majority of content has been updated and published in the publications noted below. Hb 145 was developed as a source of calibration procedures for weights and measures laboratories and covered mass length and volume calibrations for field.

Nbs handbook 145 1986 handbook for the quality assurance of metrological measurements by john k. As instruments become more complicated successfully identifying and applying best practices can reduce business expenses and improve organizational capabilities. The calibration of a measuring instrument allows d etermining the deviation of the. A calibration can be executed e ither on a measuring instrument or system or on a measurement standard.

Calibration is a comparison between a known measurement the standard and the measurement using your instrument. Where no such standards exist the basis used for calibration or verification shall be recorded. Calibration in its most basic form is the measuring of an instrument against a standard.