| 摘要 |
PURPOSE:To perform on-line confirmation of switching to a battery module by providing a variable resistor and an indication circuit for confirming switching of power source in the input circuit for an output voltage monitoring element. CONSTITUTION:A variable resistor 21 is inserted between the joint (a) of voltage division resistors 3, 4 and a resistor 3. A light emission diode 23 is inserted between the emitter and collector of Tr6 through a resistor 24 thus constituting an indication circuit for confirming switching of power source. On-line switching to a battery power source can be made by operating a resistor 21 and turning Tr5, Tr6 OFF while visual confirmation of switching between a power source module 2 and batteries 10-12 can be made by lighting/unlighting the diode 23. |
