FIELD: measuring technique.
SUBSTANCE: method comprises connecting two differential pressure gages to the measurement points through a divider of the air signal. The divider is composed of two constant and one variable air resisters. The input constant air signal is converted into a varying signal by dividing it by a varying value. The output electric alternative signal from the differential pressure gage is amplified and sent to the synchronous detector. The pressure drop is judged by the results of detecting.
EFFECT: simplified method and enhanced precision.
1 dwg
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