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一前言当前,随着空间技术和无线电电子学飞速发展,对检测微弱信号和确定干扰场的影响提出了很高的要求。这些宽频段高度灵敏的接收设备,需要在其频段内准确地测定其灵敏度。另外,国防、科研机关和生产车间普遍地使用着各种宽频段高灵敏度(小量程)的小电压测量仪表。目前由于缺乏宽频段小电压的标准设备,使这些接收设备和小电压测量仪表处于难以定度的状态。为了寻找满意的定度手段,我
I. INTRODUCTION Nowadays, with the rapid development of space technology and radio electronics, high requirements are placed on the detection of weak signals and the influence of interference fields. These broadband, highly sensitive receiving devices require their sensitivity to be accurately determined in their frequency band. In addition, the defense, research institutes and production plants generally use a wide range of high sensitivity (small range) of small voltage measuring instruments. At present, due to the lack of standard equipment with a small voltage and wide frequency band, these receiving devices and small voltage measuring instruments are in a state of being difficult to be calibrated. In order to find a satisfactory means of determination, I