Rockwell Automation 441-PEN25 Enpac Ex Data Collector - Manual (Page 54)

Publication GMSI00-UM001A-EN-E - February 2005
48 Setting Up Measurements
Figure 3.8 Magnitude with multiple frequency bands measurement definitions
The filter specifications are shown in the table below:
Magnitude and Phase Measurements at Orders
Emonitor and the Enpac Ex support collecting the magnitude and phase at
orders. This topic describes the steps to set up measurement definitions to
collect magnitude and phase with the Enpac Ex. There are several things you
may need to know about collecting magnitude and phase at orders.
• You must select Also collect phase data in the collection specification
to collect phase.
• You must select Analog when you define orders filters. The Enpac Ex
automatically uses its internal order filters if you are collecting phase. If
you are collecting only magnitude values and you do not select this
option, the Enpac Ex collects a spectrum and Emonitor calculates the
magnitudes after unloading.
• When collecting magnitude and phase at orders, the Enpac Ex always
collects a spectrum measurement, and then calculates the magnitude
and phase values from the spectrum.
• The Enpac Ex can collect phase only at the first through eighth orders.
• The Enpac Ex can collect magnitude only at the first through the eighth
orders. If you request additional orders, Emonitor calculates magnitude
values at additional orders from the spectrum after unloading the data.
• The Enpac Ex may collect more orders than requested, but it does not
collect fewer than requested. Only the requested values are unloaded
into Emonitor.
Table 3.7 Filter specifications for magnitude with multiple frequencies
Name Low Cutoff High Cutoff Data collector filter type
0.8-1.2 Order 0.8 Orders 1.2 Orders None
1.2-3.5 Order 1.2 Orders 3.5 Orders None
3.5-8.5 Order 3.5 Orders 8.5 Orders None
8.5-50% Fmax 8.5 Orders 50% Max Freq None
50%-100% Fmax 50% Max Freq 100% Max Freq None
0.8-100% Fmax 0.8 Orders 100% Max Freq None