Rockwell Automation 1441-PEN25-Z Enpac 2500 Data Collector - Manual (Page 89)

Rockwell Automation Publication GMSI10-UM002D-EN-E - August 2012 89
Setting Up Measurements Chapter 2
Time Waveform Measurement Definitions
Emonitor and the Enpac support time waveform measurement definitions. This
topic lists the unique characteristics of the Enpac that you may need to know
when setting up and collecting time waveform data.
• The Enpac 2500 cannot collect phase with time waveform measurement
definitions.
• You can choose to have the Enpac collect a time waveform only if a
magnitude measurement at the same location is in alarm. Set the Collect
and store condition in the Edit Storage Specification dialog to ‘On
Magnitude Alarm’ for the storage specification for the time waveform
measurement definition.
• The Enpac supports integrated time waveform measurements (single
integration). This means you can collect a time waveform with velocity
units using an accelerometer or displacement units using a velocity
transducer.
• The length of the time waveform depends on the maximum frequency you
select in the collection specification.
• You can calculate the number of time samples from the number of spectral
lines (Collection Specification dialog) using this formula.
You can calculate the total time required to collect a time waveform
measurement from the Number of lines value and the Maximum
frequency value in the Collection Specification dialog (Setup > Collection
Specification).
If your Maximum frequency is specified in CPM, convert CPM to Hertz
using this formula.
time samples spectral lines 2.56  =
Fmax (Hz)
Fmax (CPM)
60
------------------------------- =