| 摘要 |
PURPOSE:To obtain an analog input device featuring the simplified circuit constitution by giving the necessary action through the timing control of the switch. CONSTITUTION:The analog amplifying board is switched and P-MOSFET switch for analog signal input is turned on in a short time right before group relay 16 for scanner board switching is turned on. Thus, the electric charge at the floating capacity of the input line is discharged via the loop of switch 13 to the input short of the amplifier doubling line discharging FET switch 14. After this, relay 16 is turned on, and the short switch 14 is turned off at time point A when the contact noise of relay 16 is reduced. Then switch 13 is turned on again about 10mus later from the OFF of switch 14 in order to supply the signal to the amplifier. With end of operation of the amplifier, relay 16 and switch 13 are turned off concurrently and then switch 14 is turned on in the delay of about 10mus. |
