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故障现象:仪器初始化后,打印出错信息“GASFLOW ERROR”,燃气流速显示0.00。原理分析:AA—670原子吸收分光光度计的乙炔气体流量可通过盘输入或计算机程序控制。接口电路如图1。在初始化程序控制下,CPU输出地址$008E选择数据锁存器U9,输出脉冲信号经功率块TD62064驱
Symptom: After the instrument is initialized, the error message “GASFLOW ERROR” is printed and the gas flow rate is displayed as 0.00. Principle Analysis: The acetylene gas flow rate of AA-670 atomic absorption spectrophotometer can be controlled by disk input or computer program. Interface circuit shown in Figure 1. Under the initialization program control, CPU output address $ 008E select the data latch U9, the output pulse signal driven by the power block TD62064