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Monitoring Traces for Excessive Vibration Levels
You can use the
Go/No-Go
feature in MultiView to monitor the traces for excessive levels of vibration and indicate
when your specified levels are exceeded. The figure below shows the trace display with the
Go/No-Go
feature
active.
Parallel red lines in each trace indicate the
Go/No-Go
tolerances, which you can set separately for each trace. A
vertical green bar appears at the far left of each trace to indicate that the trace is within your specified tolerances.
When the trace continuously exceeds your tolerance settings for more than one millisecond (the qualification
time), the vertical bar changes to red. You can specify a qualification time from 1 to 10 milliseconds. If the trace
exceeds your settings, but remains so for less than the qualification time, the
No-Go
tolerances are not affected,
and the bar remains green.
You can set the amount of time the red bar remains on from 1 to 10 seconds, or it can stay on until you clear it
with the
Clear No-Go
button. Extending the length of time the red bar remains on makes it easier to catch narrow
spikes. However, if another Go/No-Go event occurs while the bar is already red, it restarts the timer for displaying
the red bar. So in practice, a red bar might remain on for many seconds, when multiple events occur in close
succession. In addition, MultiView can issue an audible beep to indicate when a trace exceeds a Go/No-Go
tolerance.
Red bar shows RMS trace has
exceeded one of the
Go/No-Go
limits
No/No-Go
limits for X trace
Green bar shows Y trace is
within
Go/No-Go
limits
