故障现象:稳流稳压V/mA表指示异常,氢灯、钨灯均不亮。分析检修:该机稳流稳压如附图所示,它主要由灯丝加热系统,高压直流回路及高压触发系统四部分组成。在正常情况下,当选用氢灯(H)工作时,电源开关K_1按下,高压直流电、灯丝加热及稳流回路立即开始工作,在氢灯的正负极之间形成较高的电位差。待氢 Symptom: The steady-state voltage regulator V/mA meter is abnormal, and the hydrogen and tungsten lamps are off. Analysis and maintenance: The steady flow regulator of the machine is shown in the drawing. It consists of four parts: filament heating system, high-voltage direct current loop and high-voltage trigger system. Under normal conditions, when the hydrogen lamp (H) is selected for operation, the power switch K_1 is pressed, the high-voltage direct current, the filament heating, and the steady flow circuit start working immediately, and a high potential difference is formed between the positive and negative poles of the hydrogen lamp. To be hydrogen