| 摘要 |
PURPOSE:To prevent the occurrence of a control defect by providing a gain adjusting means which converts the output signal of an amplifying means to digital data and adjusts the gain of the amplifying means so that the level of digital data is lower than a set level in the case of digital data equal to or higher than the set level. CONSTITUTION:Amplifying means A2 and POT which have the adjustable gain and amplify an analog signal and a gain adjusting means MCU are provided, and this means MCU converts an output means V2 of amplifying means to digital data AN; and when digital data AN is equal to or lower than the set level, the means MCU adjusts the gain of amplifying means A2 and POT so that digital data is lower than the set level. When the output signal V2 of amplifying means A2 and POT is larger than a set value, the gain of amplifying means A2 and POT is so adjusted that it is smaller than the set value. Consequently, digital conversion data is not deviated from a prescribed range. Thus, a control defect is prevented. |
