This paper presents the results of an inter-laboratory comparison in torque with cross force measurement among fifteen participating laboratories in Thailand. This is the first time for setting torque type inter-laboratory comparison. The comparison was carried out between July 12th, 2010 and November 5th, 2010. The program was piloted and referenced by the National Institute of Metrology (Thailand), NIMT. The comparison was made as a star form, in which the artifacts were sent back to the pilot laboratory (to measure) after every measurement conducted by the participating laboratories. This pattern continued until all participating laboratories completed their measurement. The reference value, which was used to compare the results from the pilot laboratory and that from the participating laboratories, was specifically provided for each participating laboratory. After the pilot laboratory measured the artifacts to find out the reference value for the next participating laboratory, the artifacts were sent to that participating laboratory. The degrees of equivalence of each laboratory's competence were expressed by E_n numbers. The results of this comparison showed that the deviation from the reference value was almost within ±1.5 percent and E_n ≤1. In the metrology investigation, the influence of reproducibility from re-setting torque value could be estimated about ± 0.5 percent of reading.
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