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某些721型分光光度计在变换灵敏度档时, 仪器的电表指针会出现高频抖动现象,并且随着灵敏度档的增大而加剧。产生这种现象的原因是由于仪器的电源变压器屏蔽不良,导致变压器的初级电压经分布电溶耦合而产生工频干扰。该干扰在微电流放大器的偏置电阻上产生
Some 721 Spectrophotometers change the sensitivity profile and instrument jitter on the meter leads to dithering and aggravates as the sensitivity profile increases. The reason for this phenomenon is due to poor shielding of the power transformer of the instrument, resulting in the primary frequency of the transformer being distributed by the galvanic coupling resulting in the interference of the power frequency. This interference is generated on the bias resistor of the micro-current amplifier