给出了实验原理和仪器配置；
The experimental principle and the instrument disposition are presented.
连接软管，排放仪器气体，按照仪器配置的说明书读出压差值。
Connect hoses, vent meter and read pressure differential in accordance with instructions furnished with meter.
这意味着：没有错误的阅读，由于错误的校正，或无意改变仪器配置。
This means: no more faulty reading as a result of wrong calibration, or unintended changes to the instrument configuration.
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