Rockwell Automation 441-PEN25 Enpac Ex Data Collector - Manual (Page 42)

Publication GMSI00-UM001A-EN-E - February 2005
36 Setting Up Measurements
Emonitor uses a high pass filter with one of the low frequency cutoff shown in
the table below. It uses the filter whose cutoff is greater than or equal to the
result of the formula.
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 Ex. 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 Ex 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
Enpac Ex. 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 Ex, 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 Ex, it maps to the 5 kHz gSE filter.
Integrated (A to V, A to D, V to D) Non-integrated (A, V, and D)
0.36 Hz (21.6 CPM) 0.18 Hz (10.8 CPM)
5.30 Hz (318 CPM) 2.67 Hz (160.2 CPM)
23.80 Hz (1428 CPM)
IMPORTANT
If you want phase, remember to specify the Maximum
frequency (in Collection Specification dialog box) in
Orders, select Analog in the Band Filter Specification
dialog box and Order normalize in the Collection
Specification dialog box. Emonitor does not select these
options by default.