| 摘要 |
According to one embodiment, an apparatus is disclosed that includes a compressor pump and a duty cycle controller. The duty cycle controller controls amount of time that the compressor pump is on each duty cycle. The amount of time is selected so that the compressor pump will operate at a pressure above a desired fill pressure. The operational pressure will generate a restrictive pressure having limited effect on accuracy of pressure reading. Other embodiments are disclosed herein.
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