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To tune a control loop, analysis software must process some loop data. You must test or bump the loop somehow. For example a setpoint change in automatic or a controller output change in manual mode.

Using standard vibration measurement methods on reciprocating machinery, to determine its running condition, has demonstrated itself to be unreliable! For years we, as an industry, have applied the techniques which have been mastered for measuring and understanding rotating machinery, to reciprocating machinery, only to produce confusing results.