Rockwell Automation 441-PEN25 Enpac Ex Data Collector - Manual (Page 62)

Publication GMSI00-UM001A-EN-E - February 2005
56 Setting Up Measurements
Time Waveform Measurement Definitions
Emonitor and the Enpac Ex support time waveform measurement definitions.
This topic lists the unique characteristics of the Enpac Ex that you may need
to know when setting up and collecting time waveform data.
• The Enpac Ex cannot collect phase with time waveform measurement
definitions.
• You can choose to have the Enpac Ex 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 box to
"On Magnitude Alarm" for the storage specification for the time
waveform measurement definition.
• The Enpac Ex 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 box) 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 box (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
------------------------------- =