Note on the results of the first phase of an international comparison in the pressure range 20-100 MPa organised by the High Pressure Working Group of the Comite Consultatif pour la Masse

Technical activities 1985 :

“…Measurement services support activities fall into three broad categories: (1) the documentation of measurement services, (2) the development of improved measurement methods and standards, and (3) the automation of the measurement systems used to perform both regular and MAP calibrations.…”

“…The thrust in the resistance area is to improve scaling from the national standards at 1 Construction of the second automated system (System II) for ac-dc difference calibrations has been completed.…”

“…Generally encouraging results were obtained from these prototype commercial instruments in the range from less than 1 A system of data file formats, management and backup procedures, and computer programs to implement necessary data-base management functions for both technical and administrative data has been developed and is nearly fully written. New quality control procedures for ensuring the integrity of the measurements in the Volt Facility have been developed and implemented.…”

“…These provide a highly accurate resistance ratio that will be used to determine the ratio of two currents in the experiment. The resistance boxes were calibrated against the NBS 1 reference bank via a 100:1 Hamon standard.…”

“…Major accomplishments in the project to automate the calibration of standard resistors in the range from 1 00 n to 1 included the modification of a guarded mercury stand to hold the resistors being calibrated, and the construction of a prototype circuit to determine the optimum detector system. -Establish measurement controls and procedures to enable DoD primary standards laboratories and those of instrumentation manufacturers to obtain reduced uncertainties for special tests of thermal voltage converters.…”