by straightshooter » 02 Aug 2019, 7:21 am
As stated earlier CUP is an inferred pressure reading based on the compression of a standard copper slug.
Chamber pressure expressed in PSI is usually measured more directly using piezo or high slew rate strain gauge sensors.
Piezo comes closer to reporting a true pressure curve with a more faithful indication of peak pressure rather than a pressure vs time indication but it is still insufficiently reliable in indicating instantaneous pressure excursions that exceed it's response time.
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