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日产FD-15型心电图机在使用数年后易因蓄电池老化、充电速度变慢而发生充电困难,开机自停的故障。该机充电器充电指示电路如图所示。原电阻R值较小,为15Ω,对发光二极管的分流很大,在充电电流降到50mA左右时发光二极管就熄灭(此时蓄电池的开路电压为+12V左右),临床操作人员往往误认为已充电完毕,其实蓄电池仍在充电。此时做心电图,会因蓄电池电量不足致使仪器过放电保护电路工作而自动关机(刚
Nissan FD-15-type ECG machine easy to use after a few years due to battery aging, slow charging and charging difficulties occur, the power failure. The charger charging circuit instructions as shown. R value of the original small resistance, 15Ω, a very large shunt of light-emitting diodes, the charging current dropped to about 50mA when the light-emitting diode goes out (this time the battery open-circuit voltage of about + 12V), clinical operators often mistaken for that Charging is completed, in fact, the battery is still charging. At this point to do ECG, battery power shortage will lead to the instrument over-discharge protection circuit automatically shut down (just