山东高密产6400A型火焰光度计灵敏度开关设0、1、2档，当置0档时，放大器不接通。该机说明书的操作步骤是：①打开主机开关，灵敏度置1或2档。②揿点火按钮，旋开点火阀，待红色明火出现后、再拧燃气阀，至兰色火焰出现，……。我们照此操作，发现当撤点火按钮时，电热丝发出的 Shandong Gaomi 6400A flame photometer sensitivity switch set 0,1,2, when set to 0 files, the amplifier is not connected. The operating instructions of this manual are: 1 Turn on the main switch and set the sensitivity to 1 or 2 levels. 2 揿 Ignition button, unscrew the ignition valve, wait until the red flame appears, and then twist the gas valve until the blue flame appears. We followed this operation and found that when the ignition button was removed, the electric wire emitted