Rockwell Automation 441-PEN25 Enpac Ex Data Collector - Manual (Page 55)

Publication GMSI00-UM001A-EN-E - February 2005
Setting Up Measurements 49
• The Enpac Ex may display a phase value that differs from the value that
appears in Emonitor by up to one degree.
• Phase and magnitude measurements at orders require an external trigger
signal.
To set up multiple measurement definitions for magnitude and phase
You create only one measurement definition for magnitude and phase at each
order. The Also collect phase data check box in the Collection
Specification dialog box determines whether you also want to collect phase as
well as magnitude data.
1. Create a new measurement definition by selecting "Magnitude" in the
Data Type column in the Measurement Definition pane.
2. Select the units for the measurement definition, using a dynamic unit
such as g’s, m/s2, ips, mm/s, mils, um, or V.
3. Select the measurement filter. To collect the magnitude and phase at an
order, select a band filter centered on the order. For example, select
(create if necessary) a first order band filter with a Low cutoff of 0.8
Orders, and a High cutoff of 1.2 Orders. See Measurement Filters on
page 33 for details and the examples on the following pages.
4. Select the collection specification. You must select the Also collect
phase data check box in the Collection Specification dialog box so
the data collector collects phase at orders.
5. Select the storage specification. The first measurement definition is now
complete.
6. If you want to create more than one measurement, copy the
measurement definition by selecting the correct row and selecting Edit
> Copy.
WARNING
Do not connect the Enpac Ex to an external trigger unless
the area is known to be nonhazardous.
IMPORTANT
It is very important that order band filters be centered on
the order. For example, 0.7 to 1.3 orders, 0.8 to 1.2 orders,
0.9 to 1.1 orders, etc. If you do not center the band filters,
magnitude and phase readings may not be accurate.