![]() Laboratories were advised to report the values of various parameters related to the artifact including the temperatures at which the measurements were made. Six measurements were performed at each eleven pressure points, three each in increasing and decreasing orders of pressures, respectively. 0.7 MPa, 14 MPa, 21 MPa, 28 MPa, 35 MPa, 42 MPa, 49 MPa, 56 MPa, 63 MPa and 70 MPa throughout the entire pressure range. The comparison was carried out at 11 arbitrarily chosen pressure points i.e. The stability of the artifact was assessed by measurements made at NPLI before and after the circulation of the artifact. ![]() National Physical Laboratory (NPLI), New Delhi, India has the responsibility of coordinating this programme and also acted as a reference laboratory. proficiency testing (PT) is to assess the laboratory's technical competence to perform measurements and also fulfilling the requirement of ILAC/APLAC in regards to the compatibility of results submitted by these laboratories. The primary objective for organizing this. This paper describes the proficiency testing of the seven laboratories, accredited by National Accreditation Board for Testing and Calibration of Laboratories (NABL), India using a Digital Pressure Calibrator (DPC) as an artifact in the pressure range 70 bar to 700 bar (7 MPa to 70 MPa).
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