Rockwell Automation 1441-DYN25-Z Dynamix 2500 Data Collector - Manual (Page 96)

96 Rockwell Automation Publication 1441-UM001B-EN-P - September 2012
Chapter 3 Setting Up Measurements
To up a Collection Specification with Window set to Hanning, select the
Maximum frequency in Orders, and make sure to select the Order normalization
option.
The Dynamix 2500 data collector may collect more orders than required. For
example, if you set the Maximum frequency to 10 Orders, the Dynamix 2500
data collector may collect more than ten orders. The Dynamix 2500 data
collector always collects at least the number of orders you request in the
Collection Specification.
The Dynamix 2500 data collector displays an order normalized spectrum:
• If the Collection Specification dialog box has Also collect phase data
checked, and if the Maximum frequency is eight orders or less, the table on
the instrument’s screen shows the magnitude and phase values at each
order.
• If the Collection Specification dialog box does not have the Also collect
phase data checkbox checked, or if the Maximum frequency is more than
eight orders, the table on the data collector shows magnitude values only.
The instrument displays a maximum of eight orders in the table.
• If the table has eight orders or less, the arrow keys move the spectrum
cursor.
• If the table has more than eight orders, the arrow keys scroll the table
values.
Proximity Probe Measurements
Proximity probes measure the position and motion of a shaft within a bearing.
You can use a spectrum measurement definition to measure the dynamic or AC
component of a proximity probe measurement. This indicates the motion of the
shaft within the bearing at each frequency.
Follow these steps to set up a proximity probe.
1. Set up a displacement transducer in the Transducer Calibration dialog box
with Input type set to AC Coupled and Units set to mils or um.
Make sure you enter the Calibration value that converts the voltage to a
displacement.
2. Set up the Collection Specification to include the displacement
Transducer, and set the Signal detection to Peak-Peak.
TIP The Averaging can be either linear or time synchronous, but should
include at least four averages.