The difference between multiple vacuum gauges can be one order

Due to the pandemic, the vacuum was stopped for more than 5 months.

In May 2020, after the return of Mr. Liu, the vacuum vessel started to recover. Since a piping conduct is not fully baked for a while, a vacuum gauge connected at this conduct reads a order higher than the readings from vacuum gauges directly connected to the vacuum vessel.

For example, the vacuum gauge shows more than 2E-4 Pa, but the vacuum gauge directly connected to the vacuum vessel reads 1E-5 Pa.

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