| 摘要 |
PURPOSE:To obtain a small-sized device which requires less power consumption and also obtains a rough resistance value of a sample to be measured in the form of the level of an acoustic output and variation in frequency, by connecting said sample to the power source circuit of an OR oscillating circuit. CONSTITUTION:A CR oscillating circuit using an astable multivibrator is constituted as a CMOSIC3, whose output is connected to a piezoelectric speaker 2. One of power supply input terminals of the IC3 is connected to a battery 4, and the other terminal is connected to one of measurement terminal 1 while the other measurement terminal 1 is connected to the battery 4. A sample RX to be measured is connected to the measurement terminals 1 to doubl as the function of a power switch, and the oscillation frequency is varied without varying the circuit constant of the CR oscillator of the multivibrator of the IC3. Consequently, a conduction checker which has small-sized constitution and less power consumption and also informs a rough resistance value of a sample to be measured is obtained. |
