latency also reduces the time required to test as much as possible , including precision nice black ( ) a provides a test method of the flow control device that can be carried . To this end , in the flow rate is controlled fluid flow passage , the flow control device is a black target 4 and | a flow control device (5) as a reference , By providing in series in this order from the upstream , the black a flow rate control device 4 is the target of the valve about the deployment ( ) flow rate in the state ratio ( ) and at the same time as the control condition , a predetermined flow rate by the flow rate of the fluid flow control device 5 which is the reference with the measured flow rate by the control state , and flow rate control device 4, which is in the black target , and to determine whether they are within a predetermined range of the measured flow rate by the flow rate control device (5) which is the reference .
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