Diagnosing Ghost Frequency
This paper describes a case study where machinery vibration data was measured and tests were performed using the CSI 2410 analyzer. Measurements were taken during steady state and shutdown of multiple machines. Measurement and analysis was complete in hours rather than days. Efficiency and comprehensive analysis enabled the technicians to see a problem: a ghost frequency. The key was the CSI 2140 4-channel collection capability with a tachometer available simultaneously on a separate channel. Technicians completed the tests and made plans to resolve the ghost-frequency issue.