![]() Further, you are probably aware that NI and BN's business styles are about 180 degree's from one another, at least in my opinion. And, since you both appear very knowledgeable you may be familiar with Bently. Bently of course, is the established main stay of rotating machinery diagnostics. One, I am trying to satisfy a customers question. Secondly, I am comparing National Instruments and Bently Nevada. Would you direct me to the VI's that make this measurement and where in the code it occurs? It would seem a correct conclusion that a signal occurring at eight (8) times rotative speed would have its phase lag relationship measured once every eight cycles of the super synchronous signal. Thank you both for the very informative and revealing replies. When the heavy spot passes the proximity probe and the keyway slot passes the tachometer simultaneously, the peak of the vibration does not lag or lead the reference trigger point. ![]() ![]() When the heavy spot passes the proximity probe, the vibration reaches a peak. The heavy spot causes the shaft to vibrate as the shaft rotates. When the keyway slot passes the tachometer, the tachometer detects a trigger pulse. The shaft has a heavy spot and a keyway slot. The trigger point here is the tachometer pulses.įigure 1 shows the relationship of the vibration signal and reference signal to zero degree phase. This means the directions of numerically increasing angles are always set against the shaft rotation. Phase is defined as the angle difference measured from the peak of a vibration signal backward in time to the reference trigger point. The Phase measurement in the LabVIEW Order Analysis Toolkit uses the phase lag convention.
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