Abstract：The WR-42 power standard is a micro-calorimeter system that uses DC substitution and calorimetry techniques to measure the effective efficiency of the WR-42 thermistor mount. The uncertainty assessment of effective efficiency in WR-42 micro-calorimeter system is introduced, and the measurement results of effective efficiency and uncertainty are given. The development of this power standard fills the gap between 18GHz and 26.5GHz, which help Chinese RF power standard fully cover the frequency band between 10 MHz and 220GHz.
［1］崔孝海,李勇,张淑溢,等. 毫米波WR-15(50~75 GHz)国家功率基准的研制［J］. 计量学报, 2014, 35(4):378-381.
Cui X H, Li Y, Zhang S Y, et al. Design and Realization of the WR-15 (50~75)GHz Millimeter-wave Power National Primary Standard［J］. Acta Metrologica Sinica, 2014, 35(4):378-381.
［2］袁思昊, 刘欣萌, 黄辉. 110 GHz可溯源的On-wafer GaAs基Multi-TRL校准标准件研制［J］. 计量学报, 2019, 40(5):760-764.
Yun S H, Liu X M, Huang H. Research On 110 GHz Traceable Multi-TRL Calibration
Standard Based on On-wafer GaAs［J］. Acta Metrologica Sinica, 2019, 40(5):760-764.
［3］张杰,宋振飞,李君,等. 基于里德堡原子的微波功率精密测量［J］. 计量学报, 2019, 40(5):749-754.
Zhang J, Song Z F, Li J, et al. Precision Measurement of Microwave Power Using Rydberg Atoms etrology［J］. Acta Metrologica Sinica, 2019, 40(5):749-754.
［4］崔孝海, 李勇, 孙伟杰. 毫米波国家功率基准及其国际关键比对［J］. 空间电子技术, 2013, (4): 94-95.
Cui X H, Li Y, Sun W J. Nation Millimeter-wave power standard and its international key comparisons ［J］. Space Electronic Technology, 2013, (4): 94-95.
［5］李勇, 崔孝海, 孙伟杰. WR-22微波功率基准工作原理及其不确定度［J］. 计量技术, 2014, (4): 18-20.
Li Y, Cui X H, Sun W J. Working principle and uncertainty of WR-22 microwave power standard ［J］. Measurement Technology, 2014, (4): 18-20.
［6］Huang Y, Yuan W, Cui X H, et al. WR-42 Waveguide Microcalorimeter for Thermistor Mount Calibration［C］// CPEM 2018. Paris, France.
［7］Cui X H, Crowley T P. Comparison of experimental techniques for evaluating the correction factor of a rectangular waveguide micro-calorimeter［J］. IEEE Trans Instrum Meas, 2011, 60(7): 2690-2695.
［8］Cui X H, Meng Y S, Li Y, et al. Comparative modeling of thermal isolation section in a rectangular waveguide microcalorimeter［C］//CPEM 2016 Conf Digest. Ottawa, Canada.
［9］Cui X H, Meng Y S, Li Y, et al. An improved design and simplified evaluation technique for waveguide micro-calorimeter［J］. IEEE Trans Instrum Meas, 2016, 65(6): 1450-1455.
2020, Vol. 41 
