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调制一解调型直流微伏放大器在我们生产的温控仪表DWSK-Ⅲ和DWK-Ⅲ中,用以放大比较后的偏差信号。DWSK-Ⅲ和DWK-Ⅲ主要用于控制玻璃拉丝坩埚漏板的温度。温控精度为1200±0.5℃。这样的温控精度对微放器提出了相当高的要求。例如当偏差信号有12μV误差时,漏板温度将偏离设定值1℃,要使漏板温度偏离设定值≤0.5℃,要求偏差信号出现的误差≤6μV。在整个系统中,造成误差的主要部份包括定值器、冷端补偿器和微放器等。将6μV的误差要求分配到各部份,要求微放部份造成的
Modulation and demodulation DC microvolt amplifier in our production of temperature control instruments DWSK-Ⅲ and DWK-Ⅲ, to amplify the comparison of the deviation signal. DWSK-Ⅲ and DWK-Ⅲ is mainly used to control the temperature of glass drawing crucible leakage plate. Temperature control accuracy of 1200 ± 0.5 ℃. This temperature control accuracy of micro-amplifier put forward quite high requirements. For example, when the deviation signal has a 12μV error, the drain board temperature will deviate from the set value by 1 ° C. If the drain board temperature deviates from the set value ≤0.5 ° C, the error of the deviation signal should be ≤6μV. In the entire system, the main part of the error caused by the set-point, cold junction compensator and micro-amplifier. The 6μV error requirements assigned to each part of the request caused by micro-release