Analysis of the reasons for the slow precision vacuuming speed of the vacuum coating machine

The reasons for the slow precision vacuuming speed of the vacuum coating machine are mainly found from the following aspects:
First, the diffusion pump may not be very good.
Solution: You can use an ionizer to measure the pump port of the single diffusion pump to see how much the single diffusion pump can pump, and then look at the suction time and limit, and then compare.
2. There is a slight leak in the vacuum system.
Solution: You need to slowly detect the leak to see if the vacuuming time can meet the standard.
3. The box is too dirty, and the gas is too dirty.
Solution: Clean the carton
4. The vacuum degree of the front stage is not good, and the final vacuum degree of the mechanical pump or mechanical pump plus Roots pump is not good.
Solution: The front tube can be detected with a resistance meter alone.