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1.电位差计指针跑向满刻度,电子管G_1、G_3灯丝不亮。经查是电子管G_1(6N2起一、二级电压放大作用)、G_3、G_4(6N1作功放)中,G_4至G_3、G_1的灯丝电源连线虚焊,故G_1,G_3不工作。焊好后,仪表工作正常。 2.指示指针跑向最小刻度端。用UJ33a直流电位差计在仪表输入端输入信号,仍无反应,经查是滤波器的R=120Ω脱焊,更换滤波板,故障消除。 3.故障现象是,仪表工作时,其记录曲线很不规律,似有干扰,用酒精擦滑线盘、换放大器和滤波板均无效。这种现象在指示温度为900℃发生,而800℃、1000℃点时无此现
1. Potentiometer pointer ran full scale, tubes G_1, G_3 filament does not light. The investigation is the tube G_1 (6N2 from one or two voltage amplification), G_3, G_4 (6N1 for power amplifier), G_4 to G_3, G_1 filament power connection Weld, so G_1, G_3 does not work. After welding, the instrument is working normally. 2. Indicate the pointer to run to the minimum scale end. UJ33a DC potentiometer in the instrument input signal input, still no response, the investigation is the filter R = 120Ω desoldering, replace the filter board, troubleshooting. 3 fault phenomenon is that the instrument work, the recording curve is very irregular, it seems that interference with alcohol glide reel, amplifier and filter board are invalid. This phenomenon occurs at an indicated temperature of 900 ° C, but not at 800 ° C and 1000 ° C