PeakVue and demodulation

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 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