Rockwell Automation 1441-PEN25-Z Enpac 2500 Data Collector - Manual (Page 63)

Rockwell Automation Publication GMSI10-UM002D-EN-E - August 2012 63
Setting Up Measurements Chapter 2
or more active data collectors, you may not see all the selections available for the
Enpac.
Measurement Filters
Emonitor and Enpac 2500 each support certain measurement filters. Some of the
filters are supported in both Emonitor and Enpac 2500. You can define custom
band filters (high pass, low pass, band pass) by creating a new band filter using
Setup > Band Filter. You can choose to use a filter in the Enpac 2500 by selecting
the Analog or RSS (digital) option when you define a filter.
Figure 8 - Defining a Band Filter
IMPORTANT Filters in Emonitor are referred to as software filters. Filters in data
collectors are referred to as hardware filters. Hardware filters alter the
signal in the Enpac 2500. Emonitor software filters alter the signal (data
representing the signal) after you unload the data into Emonitor. In
general, if the filter you want to use is available in both Emonitor and in the
data collector, it is to your advantage to use the hardware filter in the data
collector.
Hardware filters have the following advantage:
They can remove low frequency, high amplitude signal components that
would dominate the dynamic range in the data collector. This results in
improved amplitude resolution of the remaining signal range.
Software filters have the following advantage:
If there is no corresponding filter in the data collector, or you choose not to
use it, Emonitor can apply a digital filter after you unload the data from the
data collector.