| 摘要 |
PROBLEM TO BE SOLVED: To provide an air pressure control method with which a stabilized environmental condition can be obtained, and to provide a measuring unit with which air pressure can be measured with high precision at low price. SOLUTION: This pressure control device is provided with an outside air pressure detecting means 18 which detects the outside air pressure, a control mode setting means 16 which sets the second control mode with which the above-mentioned inside air pressure is controlled, based on the result of detection of the outside air pressure detecting means 18, and a control part 15 which controls inside air pressure, based on the first control mode or the second control mode set by the control mode setting means 16. |
