| 摘要 |
An electronic sphygmomanometer starts from pressurization and then enters a decompression process. When measurement of blood pressure starts, only a standard pressure release rate voltage is applied to a valve from a standard pressure release rate voltage supply circuit through a decompression control circuit. The valve allows air to be discharged slowly at the standard pressure release rate. If the pressure release rate should be increased for decompression, target pressure release rate acceleration value voltage according to the position of a dial is supplied from an external control signal supply unit. The standard pressure release rate voltage is added to the target voltage and the resultant voltage is supplied to the valve via the decompression control circuit. The valve increases the pressure release rate by the amount corresponding to the external control signal voltage. In this case, even if the dial is returned to zero position, the pressure release rate never falls below the standard pressure release rate.
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