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本文概述了电信载频衰减一级标准的研制结果。由于对多盘感分压器用作中频基准衰减器时的误差传递关系进行了较深入的探讨,设计制作出适合大动态范围衰减校准用的“电感式中频标准衰减器”,在低中频线性变频器、高稳定度的低噪声高增益10千赫中频接收机、高分辨度的恒电平零值指示器以及电信载频频段锁相稳频稳幅信号源方面的改进,使其达到如下的技术指标: 10kHz～30MHz,0～80dB,±(0.005～0.03)％每10dB
This article outlines the results of the development of the Telecommunication Carrier Frequency Attenuation Level 1 standard. Due to the error transmission relationship of multi-sense voltage divider used as mid-frequency reference attenuator, the “inductive IF standard attenuator” for attenuation calibration of large dynamic range is designed and manufactured. In low-IF linear frequency conversion The high-noise, low-noise, high-gain 10 kHz IF receiver with high stability, the high-resolution zero-level indicator with high resolution and the phase-locked frequency stabilization signal source of the carrier frequency band have been improved to the following Specifications: 10kHz ~ 30MHz, 0 ~ 80dB, ± (0.005 ~ 0.03)% per 10dB