Owner manual

148 Rockwell Automation Publication GMSI10-UM002D-EN-E - August 2012
Chapter 4 Collecting and Reviewing Data
Collect a User-defined Measurement
Follow these steps to collect a user-defined measurement.
1. After setting up the measurement, connect the proper transducer.
2. Press Enter from the Offroute User screen to start the measurement.
The measurement screen appears. The Enpac 2500 data collector ranges
and collects the data.
3. If desired, press F3 (Notes) to assign inspection codes to each point.
The Enpac 2500 data collector unloads the inspection codes when you
unload the unscheduled data to Emonitor.
See Select Inspection Codes
on page 126.
4. If you want to collect data again for this point, press F2 (Retake) to collect
the measurement again.
Window Type of window to be applied to the waveform measurement prior to computing
the spectrum
Hanning (default), Hamming, Flat Top, Rectangular
Averages Sets the number of individual data sets to be incorporated into the average
calculation.
Numeric value
4 (default)
Overlap The percentage of overlap during the averaging. It can be used to reduce the total
time that it takes to collect the data.
Percentage
Type Sets the type of averaging for the measurement. Spectral (default)
Time Synchronous
Peak Hold
Exponential
Ext Trig Slope The input signal slope to be used for externally triggering the measurement.
+ve - Defines the trigger event to occur on a rising edge.
-ve - Defines the trigger event to occur on a falling edge.
+ve (default)
-ve
Level The amplitude level for externally triggering the measurement. The level is a
percentage of the trigger full scale range.
Numeric: 0.0 (default)
Bin Zeroing Enables/disables bin zeroing. When set to Off, the bins below the selected high
pass filter are not zeroed. That is, data still appears but is attenuated by the filter
shape.
Set bin zeroing to On when you want to be sure unwanted frequencies do not
affect data. Set bin zeroing to Off when you want to be aware of the presence of
unwanted frequencies.
On (default)
Off
Table 37 - Offroute User Parameters
Parameter Name Description Values/Comments
Window Description
Hanning A general purpose window to use on random type data when frequency resolution is more important than amplitude
accuracy. Use this setting for most of your machinery monitoring activities.
Hamming Another general purpose window with slightly different window characteristics than the Hanning window.
Flat Top Use this when amplitude accuracy is more important than frequency resolution. In data with closely spaced peaks, a Flat Top
window may smear the peaks together into one wide peak. Use this for sinusoidal or calibration signals.
Rectangular The Enpac 2500 data collector does not apply a window. Use this only for transient signals that die out before the end of the
time sample, or for exactly periodic signals within the time sample.