The analyzer can use PeakVue technology or demodulation when collecting data. PeakVue technology samples data faster than demodulation to detect high-frequency stress waves. PeakVue data is trendable, but demodulation is not.
PeakVue technology lets you find bearing or gear defects earlier than other measurements. PeakVue technology removes normal vibration signals and captures the actual amplitude of high-frequency impacts from bearing or gear defects. Bearing defect frequencies appear in the PeakVue spectrum at their fundamental frequencies and harmonics. The peaks are non-synchronous. Gear defects appear as peaks at the gear’s shaft turning speed frequency and harmonics. The amplitudes in PeakVue data may be very low.
PeakVue technology passes the input signal through a band-pass or high-pass filter and samples with the peak detector. PeakVue technology allows numerous pre-defined maximum frequency values.
PeakVue waveform data is corrected so that all peaks in the data display on the positive side of the waveform. Trending of the G's Peak to Peak waveform value is the most important parameter to trend on a PeakVue measurement to determine fault severity.
Enabling PeakVue technology
Use PeakVue technology from the Bearing/Gear Analysis - PeakVue Analysis Expert or by enabling it from Manual Analyze for a measurement. Use an accelerometer to collect the data.
The key settings for acquiring PeakVue data
- Filter - The high-pass filter should be greater than or equal to the Fmax, and it defaults to 1000 Hz for machines greater than 600 RPM and 500 Hz for machines less than 600 RPM.
- Fmax - Based on the highest fault frequency.
- Averages - The number of averages to collect. One average is recommended.
- Lines of resolution (LOR) - Capture five or more periods of lowest fault frequency.
PeakVue frequency ranges
| Frequency ranges | ||
|---|---|---|
| 1 Hz | 50 Hz | 625 Hz |
| 2 Hz | 64 Hz | 800 Hz |
| 4 Hz | 80 Hz | 1 kHz |
| 5 Hz | 100 Hz | 1.25 kHz |
| 8 Hz | 125 Hz | 1.6 kHz |
| 10 Hz | 160 Hz | 2 kHz |
| 16 Hz | 200 Hz | 2.5 kHz |
| 20 Hz | 250 Hz | 4 kHz |
| 25 Hz | 320 Hz | 5 kHz |
| 32 Hz | 400 Hz | 8 kHz |
| 40 Hz | 500 Hz | 10 kHz |
| PeakVue Prefilters | |
|---|---|
| Band-pass 20 -150 Hz | High-pass 2 kHz |
| Band-pass 50 - 300 Hz | High-pass 5 kHz |
| Band-pass 100 - 600 Hz | Band-pass 5 - 6.5 kHz |
| Band-pass 500 -1 kHz | High-pass 10 kHz |
| High-pass 500 Hz | High-pass 20 kHz |
| High-pass 1 kHz | |
Demodulation
Demodulation uses a user-specified band-pass or high-pass filter to remove all low-frequency components in the signal. The signal is amplified and amplitude demodulated, which creates a low-frequency signal consisting of the envelope of the original signal. The amplitude of the original signal is not maintained when demodulation is used.
Demodulation frequency ranges
The maximum frequency using the built-in demodulator is 5 kHz. The analyzer adjusts any entered frequency to the next highest predefined frequency value.
| Frequency ranges | |
|---|---|
| 10 Hz | 400 Hz |
| 20 Hz | 500 Hz |
| 50 Hz | 1 kHz |
| 100 Hz | 2 kHz |
| 200 Hz | 5 kHz |