Uncertainty evaluation of the 20kNm deadweight torque standard machine

Ohgushi, Koji; Ota, Takashi; Ueda, Kazunaga

doi:10.1016/j.measurement.2006.08.004

Cited by 13 publications

(7 citation statements)

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“…The National Metrology Institute of Japan (NMIJ), part of the National Institute of Advanced Industrial Science and Technology (AIST), has developed three deadweight type torque standard machines (DWTSMs) [1][2][3], and has used them for the calibration of torque measuring devices (TMDs) for accredited laboratories of the first grade [4] with the relative expanded uncertainty order of 10 -5 . Figure 1 shows the SI traceability system proposed by NMIJ.…”

Section: Introductionmentioning

confidence: 99%

Calibration procedures for torque measuring devices by using a reference type torque calibration machine at NMIJ

2020

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NMIJ / AIST has been disseminating the national torque standard to Japanese industry by using deadweight type torque standard machines (DWTSMs). In general, DWTSMs can generate more precise torque than other types of TSMs. On the other hand, the calibration takes much longer time than others. One possible solution is to use a reference type torque calibration machine (RTCM). RTCMs have been developed in some national metrology institutes (NMIs). We have started the development of the first RTCM in the range of 100 mN · m to 10 N · m. In this study, we developed the automatic calibration system of the RTCM and investigated the calibration procedures for a low nominal capacity torque measuring device (TMD). It was found that the calibration could be realised by the RTCM, compared with the reliable DWTSM of rated capacity of 10 N · m at NMIJ.

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Section: Introductionmentioning

confidence: 99%

Calibration procedures for torque measuring devices by using a reference type torque calibration machine at NMIJ

2020

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“…In either case, knowing the influence of environmental factors such as relative humidity (RH) on the measuring instruments is central to understanding how they perform [2,3]. The investigation of the effect of relative humidity on the zero signal of a torque measuring system is relevant to determine how it contributes to the error component and drift of the measuring system readings [4]. This can also explain differences between calibration measurements carried out under laboratory and on-site industrial conditions [5,6].…”

Section: Introductionmentioning

confidence: 99%

An investigation on the effect of humidity on the zero signal of a strain gauge measuring system

Khaled

Mahmoud

2018

Univ. Sci.

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Humidity is one of the most important ambient factors influencing torque calibration readings. The present study addresses the effect of relative humidity on the readings of reference torque transduction and amplification devices. The results revealed a linear effect of increasing humidity on the readings of a DMP40 torque amplifier and a torque transducer at four different temperatures. Furthermore, humidity effects were smaller on the DMP40 amplifier than on the torque transducer across all four temperatures. The results also showed that the summed effects of humidity on amplifier and transducer calibration readings were larger when each device was operated under different humidity and temperature conditions (<em>i.e.</em> torque amplifier placed inside a controlled climate chamber and transducer outside, and vice-versa); as opposed to smaller summed effects, observed when both devices were operated under the same ambient conditions (<em>i.e.</em> both inside the chamber). Therefore, it is recommended to test the effect of humidity in setups where the two devices are under common humidity conditions. This is likely to lower the uncertainty parameter of obtained torque calibration readings and is a useful consideration for inter-laboratory comparisons and performance testing.

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“…A new deadweight-type TSM with a rated capacity of 20 kN•m (20-kN•m-DWTSM(K)) is also being developed [2]. The National Metrology Institute of Japan (NMIJ) has also developed three DWTSMs, which have rated capacities of 10 N•m (10-N•m-DWTSM(J)) [3], 1 kN•m (1-kN•m-DWTSM(J)) [4], and 20 kN•m (20-kN•m-DWTSM(J)) [5]. [6].…”

Section: Introductionmentioning

confidence: 99%

Inter-laboratory comparison between NMIJ and KRISS of calibration capabilities for torque measuring devices in the range from 50 N·m to 2 kN·m

Ogushi¹,

Nishino²,

Ueda³

et al. 2017

ACTA IMEKO

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Uncertainty evaluation of the 20kNm deadweight torque standard machine

Cited by 13 publications

References 0 publications

Calibration procedures for torque measuring devices by using a reference type torque calibration machine at NMIJ

Calibration procedures for torque measuring devices by using a reference type torque calibration machine at NMIJ

An investigation on the effect of humidity on the zero signal of a strain gauge measuring system

Inter-laboratory comparison between NMIJ and KRISS of calibration capabilities for torque measuring devices in the range from 50 N·m to 2 kN·m

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