Rockwell Automation 1441-PEN25-Z Enpac 2500 Data Collector - Manual (Page 311)

Rockwell Automation Publication GMSI10-UM002D-EN-E - August 2012 311
Frequently Asked Questions and Answers Appendix B
Analyzing Data in Emonitor Why does the magnitude reading not correspond to the calculated
overall value?
Emonitor can calculate an overall value from a spectrum measurement. Under
some conditions, this value may not be the same as the magnitude measurement
for the same location. The common use for this are:
• The measurement filter is not the same for the magnitude and the
spectrum measurement definitions. In this case the two measurement
definitions are measuring different frequency ranges.
• The magnitude readings taken by the Enpac 2500 are broadband readings
and are not based on the spectrum data.