| 摘要 |
Provided is a vacuum testing device for education, which is suitable to demonstrate earthly physical phenomena and electric, electronic phenomena under low vacuum less than or equal to 1 bar for elementary and middle school education. The vacuum testing device comprises: a vacuum pump (10) which receives power supply (80) and operates to make a vacuum container (20) in a vacuum state; a high pressure connection hose (30) which connects the vacuum container (20) and the vacuum pump (10); a pressure adjustment valve (70) installed to the high pressure connection hose (30) and adjusting the pressure of the vacuum container (20); a dial gauge (50) placed between the vacuum pump (10) and the vacuum container (20), displaying a degree of a vacuum inside the vacuum container (20); a vacuum adjustment valve (60) connected to one side of the dial gauge (50) to maintain the degree of vacuum inside the vacuum container (20); and a testing plate (90) on which the vacuum container (20) is placed. |
