| 摘要 |
PURPOSE:To perform exact measurement without influence of external noise, by measuring the absolute value of impedance without separating a resistance component and a capacity component thereby making the constitution of a device simple and using an electrode of the triple construction which is grounded on the outside circumference. CONSTITUTION:The square wave signal oscillated by a square wave oscillator 1 is applied through a buffer circuit 2 to a measuring electrode 3. When the electrode 3 is pressed to the skin to be examined, the potential difference between an intermediate electrode 3b and a central electrode 3c changes with the moisture content of the surface of the corneum and the detection voltage thereof is amplified with an amplifier circuit 5; further the noise is removed with a filter circuit 6. The voltage is then converted to a DC voltage with a rectifier detection circuit 7. The creast value of the signal waveform of the DC voltage is digitally converted with an A/D converter 9 and is taken successively into a latch circuit 10, by which the value is successively and temporarily stored. The digital output thereof is displayed on a digital display circuit 12 at the prescribed timing clocked with a timer circuit 11. |
