利用高精度压力传感器作为原位传递标准,提出了一种活塞压力计校准新方法.对传感器的分辨率和短期稳定性进行了测试,并评估了传感器线性系数对校准结果的影响.对比研究了新方法和传统方法的校准结果,两者的不确定度均约为5 ×10-6(k=1),且在不确定度范围内是一致的.在新方法的基础上研制了活塞压力计自动化校准装置,实现了压力控制、阀门操作和数据采集等功能的自动化.该自动化装置提高了活塞压力计校准的效率.%To investigate automated calibration of piston gauges,a high-precision pressure transducer as an immediate in-situ transfer standard was introduced.Experiments were carried out to study the resolution and short-term stability of the transducer,and the influence of the transducer linear coefficient on the calibration result was evaluated.Comparative study of the new method and the traditional method shows their uncertainties are similar as of about 5 × 10-6 (k =1) and the calibration results are in good agreement within the uncertainty.An automated calibration instrument for piston gauges was developed based on the new method with automation of pressure control,valve operation and data acquisition.The automated instrument improves the efficiency of the piston gauge calibration.
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