| 摘要 |
An altitude noise measurement apparatus for a display device is provided to enable the front of the altitude noise measurement apparatus to be opened by a door so as for the display device, pushed from the front to the rear, to be set at a predetermined distance, thereby measuring the altitude noise of the display device reliably without moving to an alpine region. A low pressure chamber is formed in a wall(2), and a side of the wall is opened. The opened side of the wall is opened or closed by a door(3). A vacuum pump(7) is linked with the low pressure chamber to discharge the inner air of the low pressure chamber forcibly. A valve(9) holds or releases the vacuum state of the low pressure chamber. A stopper(31) is extended from the wall to the inner space to set the position of a display device at a predetermined position. A microphone(32) is installed holding a predetermined distance away from the stopper.
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