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编辑同志: 在各种射频标准衰减器中,工作于H_(11)模式的圆截止波导衰减器仍然是可能获得最高精度的仪器。从各国建立其衰减计量国家标准的情况来看,精密截止波导管内表面电导率的确定,已成为这一技术发展中比较突出的一个问题。例如,美国国家标准局曾报导其工作,电导率准确在±5％以内,这样的不确定性将引起0.00026db/10db的误差,即2.6×10~(-5)。英
Editor’s Comrade: Of the various RF standard attenuators, circular-cut waveguide attenuators operating in the H_ (11) mode are still the instruments that can achieve the highest accuracy possible. From the various countries to establish their national standard attenuation measurement point of view, the precise cut-off waveguide surface conductivity determination, has become the development of this technology more prominent issue. For example, the National Bureau of Standards of the United States has reported that its work, the conductivity is accurate within ± 5%, such uncertainty will lead to 0.00026db / 10db error, that is, 2.6 × 10 ~ (-5). British