This work presents, in brief, the recently concluded extensive in-house inter-comparison of the pneumatic pressure standards at CSIR-National Physical Laboratory, India (NPLI) and the resulting marginal improvement in our measurement uncertainties. The measurements are traceable to the Ultrasonic interferometer manometer (UIM), our low-pressure primary pressure standard as well as to the national primary standard in pneumatic pressure, NPLI-P1. The inter-comparisons and the subsequent estimations of measurement uncertainties, starting from the UIM, were carried out in the overlapping pressures, ranging from 0.01 to 40 MPa. In addition, the large-diameter piston gauge, the pneumatic primary standard was also used to establish the traceability chain. A summarized description of the extensive exercise undertaken is given herein which describes the stability and the excellent agreement with previously reported results as well as successful improvement owing to better control over experimentation as well as environmental factors.

简而言之，这项工作介绍了印度CSIR国家物理实验室（NPLI）最近完成的内部气压标准之间的广泛比较，以及由此带来的测量不确定性的轻微改善。测量结果可追溯到我们的低压初级压力标准超声干涉仪压力计（UIM）以及气动压力国家标准NPLI-P1。从UIM开始，在0.01至40 MPa的重叠压力下进行了相互比较和随后的测量不确定度估计。此外，还使用了大直径活塞规，气动主要标准来建立可追溯性链。