Patent ID: 7870800

Claim:
Apparatus including a fluid coupler interfaced to a test head that comprises: a first ring having a top surface disposed in a first plane; a first movable ring, the first movable ring being movable substantially normal to the first plane relative to the first ring; a first flexible diaphragm attached to the first ring along a first attachment perimeter that encloses a first effective surface area, the first flexible diaphragm being attached to the first movable ring; a second ring having a top surface disposed in a second plane; a second movable ring, the second movable ring being movable substantially normal to the first plane; and a second flexible diaphragm attached to the second ring along a second attachment perimeter that encloses a second effective surface area, the second flexible diaphragm being attached to the second movable ring; wherein: the first flexible diaphragm and the second flexible diaphragm form a first channel for fluid flow, there being an intake aperture in the first channel and an exhaust aperture in the first channel; the test head has an intake channel to internal fluid channels and an exhaust channel from the internal fluid channels, and the test head is movable substantially normal to the first plane; the first plane is substantially parallel to the second plane; and the intake aperture in the test head is alignable with the exhaust aperture in the first channel.