Rockwell Automation 441-PEN25 Enpac Ex Data Collector - Manual (Page 53)

Publication GMSI00-UM001A-EN-E - February 2005
Setting Up Measurements 47
Collecting magnitude measurements in multiple frequency bands
You can set up multiple measurement definitions at a location to collect
magnitude values for individual frequency bands. Use band filters to define the
different frequency bands in the measurement definitions. Make sure you
select None in the Band Filter dialog box. This forces the Enpac Ex to
collect a spectrum measurement. After you unload the measurement,
Emonitor calculates the magnitude values in the bands from the spectrum.
If your measurements include both magnitude and phase, the Enpac Ex can
collect up to eight orders. If your measurements include magnitude only, the
Enpac Ex can collect up to 200 orders.
Typical magnitude measurement definitions
Figure 3.7 shows the setup for a typical magnitude measurement definition
Figure 3.7 Magnitude measurement definition.
The following table shows the STD (Hz) 2000 collection specification.
The following table shows the transducer specification in the STD (Hz) 2000
collection specification.
Figure 3.8 shows the setup for a typical set of measurement definitions with
multiple frequency bands. Note that the filter specifications used in the tables
are not currently defined in the Emonitor database. To define a new filter
specification, select Setup > Band Filters and click New.
Table 3.5 Collection specification for magnitude measurement definition
Transducer Window Signal Detection Fmax Lines Phase Order Norm? Averages
Accelerometer Hanning Peak 2 kHz 400 No No 4 linear
Table 3.6 Transducer specification in STD (Hz) 2000 collection specification
Name Base Unit Input Type Units Calibration Value DC Offset
Accelerometer acceleration ICP Accel g’s 100 0