Comparison between the Shock Pulse (SPM HD) and Envelope

Bearing Vibration Condition Monitoring - پایش وضعیت ارتعاش بیرینگ ها- پایش صنعت کویر- نماینده رسمی موسسه موبیوس- Payesh Sanat Kavir Institute-Authorized Mobius Institute Partner — Bearing Vibration Condition Monitoring – پایش وضعیت ارتعاش بیرینگ ها- عیب یابی توسط تکنیک های مختلف- Diagnosis by Different Parameters – BC- Skew- BCU -HDM- dBM- SFx-Spike Energy- Peak value-Crest Factor- Envelope Parameter

Shock pulse clearly shows the frequency of bearing failure (BPFO) but there is not any sign of damage in Vibration-Envelope

Shock pulse method (SPM) is a technique for using signals from rotating rolling bearings as the basis for efficient condition monitoring of machines. From the innovation of the method in 1969 it has been further developed and broadened and is a worldwide accepted philosophy for condition monitoring of rolling bearings and machine maintenance.
https://en.wikipedia.org/wiki/Shock_pulse_method