Rockwell Automation 1441-PEN25-Z Enpac 2500 Data Collector - Manual (Page 66)

66 Rockwell Automation Publication GMSI10-UM002D-EN-E - August 2012
Chapter 2 Setting Up Measurements
Order (magnitude) Filters
Use order filters to define the bands around orders for magnitude and
magnitude+phase measurements. You define these filters using Setup > Band
Filter. You can use order filters with the following measurement definitions:
• Magnitude
• Spectrum
You can define and use order filters for the first through the eighth orders with
the Enpac 2500. If you specify the Maximum frequency in Orders, select Analog
and Order normalize when you define the orders filters, then the Enpac calculates
the orders from an external trigger.
The Enpac 2500 then uses its own filters to calculate the magnitude and phase for
the first through the eighth orders. Emonitor calculates magnitude values
(without phase) for additional orders after you unload the data. Emonitor also
calculates magnitude values after you unload the data if you select None instead
of Analog.
Default Filters
There are also four default filters in Emonitor that map to specific filters in the
Enpac 2500. The filters are High Frequency, Envelope, Smart HP, and Overall.
• High Frequency - Typically this filter maps to a high frequency filter in
the data collector and is available only for magnitude acceleration
measurements. In the Enpac 2500, it maps to the 5 kHz gSE filter.
• Envelope - Typically this filter maps to one of the gSE filters in the data
collector and is available for magnitude and spectrum acceleration
measurements. In the Enpac 2500, it maps to the 5 kHz gSE filter.
• Smart HP - (Smart High Pass) Typically this filter maps to a specific high
pass filter in the data collector and is available for magnitude, spectrum,
and time waveform measurements. In the Enpac 2500, it maps to the
Enpac filters shown in the table below, depending on the results of
comparing the filter choice to the formula below.
Emonitor uses the following formula.
IMPORTANT If you want phase, remember to specify the Maximum frequency (in
Collection Specification dialog) in Orders, select Analog in the Band Filter
Specification dialog and Order normalize in the Collection Specification
dialog. Emonitor does not select these options by default.
2 (max frequency)
number of lines
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