what is peakvue?

Oh me oh my
You need to do a search (find) using the term peakvue. After you read all 3 zillion prior posts on the subject, come back and one of the csi users will answer any questions you may still have

Dave

Peakvue is a CSI proprietary method for signal processing.

I don't use CSI equipment, so I am probably among the least qualified to answer. But I'll still through in my two-cent simplified explanation. I'm sure parts are not 100% accurate, so anyone feel free to correct me.

While it may be an oversimplification, I view peakvue simply as a subset of demodulation algorithms. These generally involve:
1 - Low-pass filter to remove 1x, 2x etc low frequency stuff.... with the intent of leaving only higher frequency stuff like ring-down from impacts.
2 - Rectify the signal (take the absolute value)
3 - Perform envelope detection. This removes the complexities of the ringdown and allows us to focus on the shape of the envelope.

After step 3 you can look at the time waveform (look for true peak which is a very rough indication of severity at least for early stage faults), or perform an FFT of that envelope. The FFT of the envelope shows the frequency content in a more straightforward way than would the FFT of the original signal. BPFO impacting will show up much more clearly as 1*BFPO, 2*BPFO etc. (rather than peaking out around 30*BPFO as might be the case in the original spectrum).

One nice feature built into peakvue is that it does a very good job of capturing the true peak based on the very high hardware sample rate, whereas many systems such as Entek/Datapak will only let you see the peak that happens to occur at the moment of sampling at a much lower frequency 2.56*Fmax. I'm sure there are multitudinous other aspects of Peakvue that differ from what I have described above.

Do you have CSI equipment? If not, then Peakvue is not going to be a feature you use with other brands. Others call it by a different name, spike energy, enveloping, demodulation, etc.

thanks for the info ralph. I would be using spike energy. I use a enpac 2500 with ird software. emonitor is the data base

To add to EPete's description, there is a detailed setup method @

http://www.compsys.com/drknow/aplpapr.nsf/06b6f5a4de2ea...0634f3b?OpenDocument

El'Pete,

Step #1 is a High Pass filter to let the high frequencies pass and to stop the low frequencies. Step #3 is usually a Low Pass filter to detect the modulating frequencies. The whole process (steps 1 to 3) is envelope detection. This descrition is a general demodualtion scheme, but it is not how the CSI PeakVue process works. It would be best to refer to a CSI description like the link by ivibr8.

Walt