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Vacuum technology — Standard methods for measuring vacuum-pump performance — Part 4: Turbomolecular vacuum pumps
— with mechanical or magnetic bearings;
— with or without an additional drag stage(s) or other pumping stages on the shaft;
— with one or more inlet ports.
Since turbomolecular vacuum pumps are backed by primary pumps, their performance cannot be completely defined by the volume flow rate curve. Also, the driving device and the backing pressure of the turbomolecular vacuum pump is important to the performance.
The following completes the performance characteristics:
— information about throughputs and backing pressure of the turbomolecular vacuum pump;
— the compression ratio curve (compression ratio vs backing pressure of turbomolecular vacuum pump).
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