quote:Failing that, can I just take the overall vibration reading in inches/second and simply convert the inches portion to mm and be done with it?
quote:NEMG MG1-20037.8 LIMITS OF BEARING HOUSING VIBRATION7.8.1 GeneralThe following limits of vibration are for machines running at no load, uncoupled, and resiliently mountedaccording to paragraph 7.6.1. For machines tested with rigid mounting, these values shall be reduced bymultiplying them by 0.8.Vibration levels shown in the following paragraphs represent internally excited vibration only. Machines asinstalled (in situ) may exhibit higher levels. This is generally caused by misalignment or the influence of the driven or driving equipment, including coupling, or a mechanical resonance of the mass of the machine with the resilience of the machine or base on which it is mounted. Figure 7-6 establishes the limits for bearing housing vibration levels of machines resiliently mounted for both unfiltered and filtered measurements. For unfiltered vibration the measured velocity level shall not exceed the limit for the appropriate curve on Figure 7-6 corresponding to the rotational frequency. For filtered vibration the velocity level at each component frequency of the spectrum analysis shall not exceed the value for the appropriate curve in Figure 7-6 at that frequency. Unfiltered measurements of velocity, displacement, and acceleration may be used in place of a spectrum analysis to determine that the filtered vibration levels over the frequency range do not exceed the limits of the appropriate curve in Figure 7-6. For example, for the top curve in Figure 7-6 the unfiltered velocity should not exceed 0.15 in/s peak (3.8 mm/s), the displacement should not exceed 0.0025 inch (p-p) (63.5 microns), and the acceleration should not exceed 1g (peak).NOTE"”International Standards specify vibration velocity as rms in mm/s. To obtain an approximate metric rmsequivalent, multiply the peak vibration in in/s by 18.
quote:The fact that Entek Emonitor does it the wrong way is not a justification.