Rockwell Automation 441-PEN25 Enpac Ex Data Collector - Manual (Page 50)

Publication GMSI00-UM001A-EN-E - February 2005
44 Setting Up Measurements
You can either select a value from the drop down list, or you can enter a value
in Maximum frequency in the Collection Specification dialog box. If you
enter a value that does not match one of the values above, Emonitor uses the
next higher maximum frequency.
Measurement Resolution
The measurement resolution is part of the collection specification (Setup >
Collection). See Figure 3.4 on page 40. You select the collection specification
when you set up the measurement definition.
Emonitor and the Enpac Ex support the following resolutions.
The values that appear in the Number of lines drop down list in the
Collection Specification dialog box are those for spectrum measurements.
Emonitor uses the corresponding number of time samples from the table
above for time measurement definition.
You can calculate the number of time samples from the number of spectral
lines using the following formula.
You can calculate the total time required to collect a time waveform
measurement from the Number of lines value and the Maximum frequency
value in the Collection Specification dialog box (Setup > Collections).
If your Maximum frequency is specified in CPM, convert CPM to Hertz
using the following formula.
Table 3.4 Measurement resolutions
Spectral Lines Time Samples
100 256
200 512
400 1024
800 2048
1600 4096
3200 8192
6400 16,384
12,800 32,768
time samples spectral lines 2.56
×
=
Fmax (Hz)
Fmax (CPM)
60
------------------------------- =