In sTEm-at-Work Puzzle #35 the technician for Sun Hydraulics performed the quality check on a hydraulic
driven actuator before it was to be shipped to the customer. After examining the test results shown in the graphic below, the Tech did not send the actuator to the customer, but instead, sent it back for rework because the actuator leaked. The leak test involved the application of the pressure pattern shown to the right. The Tech knew that the value was not supposed to leak when the pressures in the test pattern were applied to the hydraulic fluid in the actuator.
The Tech rejected the actuator because the test results shown below were not the same square wave shape as the applied pressure test pattern shown above.
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