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Use
Use
The conversions done by VibCon are valid for sine waves only; these would be the levels read from a spectrum analyzer. These conversions are not valid for overall vibration levels, where a number of frequencies may be controlling the overall vibration levels.
The reference levels for decibel levels are based on either US standards (primarily used by the US Navy) or ISO levels commonly used in Europe. The decibel references must be selected when VibCon is first started or after [Clear] is pressed. The difference in reference levels is a factor of ten; a given vibration level will be 20 dB lower with ISO references compared to levels using US references.
After the correct reference levels are selected, the frequency of the vibration peak must be entered; it may be in either Hz or CPM. After entering the frequency of the peak, the measured vibration level may be entered in the appropriate space and all other levels will be calculated and displayed.
Hint
Hint
The original entered value is maintained during the conversions. For example, if an acceleration of 1g was entered as the initial vibration value, when the frequency is changed, the calculated levels are based on 1g at the new frequency. That makes it easy to compare the difference in levels as the frequency changes. The quick plot below shows the equivalent velocity level of 1g acceleration across the spectrum.
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