| 摘要 |
PURPOSE:To measure the liquid resistance of a sample by blocking the opening part of a vacuum tank connected to a vacuum pump with the sample, and detecting the variation of internal pressure caused after the tank is evacuated. CONSTITUTION:A rubber packing 4 is provided around the opening part in the top surface of the vacuum tank 1 and the sample 5 is mounted. The vacuum pump 2 is driven to produce a vacuum in the vacuum tank 1 and then the driving of the pump 2 is stoppeed. Consequently, the pressure in the vacuum tank 1 rises gradually becaue of the atmospheric pressure admitted into the tank through pores of the sample 5 and becomes equal to the atmospheric pressure eventually. The pressure in this vacuum tank 1 is detected by a detecting part 7 and the liquid resistance of th sample 5 is calculated by an arithmetic part 8 and displayed on a display part 9. When problems are caused by the atmospheric pressure and temperature, they are detected by detecting parts 10 and 11 and correcting arithmetic is performed by the arithmetic part 8. |
