Rockwell Automation 1441-PEN25-Z Enpac 2500 Data Collector User Manual
Page 65
Rockwell Automation Publication GMSI10-UM002D-EN-E - August 2012
65
Setting Up Measurements
Chapter 2
High Pass Filters
Use a high pass filter to remove high vibration, low frequency signal components
that would dominate the signal. Examples include structural vibration or signal
components generated by an integrator. The high pass filter excludes all
frequencies below a defined frequency. It allows, or passes, frequencies above the
defined frequency. You define these and other band filters using Setup > Band
Filter. You can use a high pass filter with the following measurement definitions:
•
Magnitude
•
Spectrum
If you select Analog (as the data collector filter type) when you define a high pass
filter, the data collector uses one of the following filters determined by the
following formula.
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.
IMPORTANT
The Datapac Emulation parameter in the Data Collector Advanced Settings
dialog (Setup > Data Collector) in Emonitor must be set to No.
for more information.
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)
EXAMPLE
ATTENTION:
Emonitor uses the 5.30 Hz (318 CPM) filter for an integrated
measurement. It uses the 2.67 Hz (160.2 CPM) filter for a non-integrated
measurement.
2 (max frequency)
number of lines
--------------------------------------------
2 120,000 CPM
400 lines
-------------------------------------------
240000
400
------------------
600 CPM
10 Hz
=
=
=