Rockwell Automation 1441-DYN25-Z Dynamix 2500 Data Collector - Manual (Page 146)

146 Rockwell Automation Publication 1441-UM001B-EN-P - September 2012
Chapter 5 Collecting and Reviewing Data
Collect Magnitude and Phase Measurements at Orders
The Dynamix 2500 data collector can collect multiple magnitude and phase at
orders of the operating speed. You use a tachometer signal measuring the
operating speed to collect phase data.
Follow these instructions to collect a spectrum for calculating additional
magnitude and phase values at orders of the operating speed.
1. Align the speed reference device, such as a tachometer, in the correct
direction and attach the vibration transducer properly.
2. From the Data Collection screen, press Enter to start ranging the
measurement.
The Dynamix 2500 data collector calculates the speed from the
tachometer signal and adjusts the maximum frequency for measuring the
spectrum so that all orders can be calculated from the spectrum:
• If you set Auto Advance to On in the Instrument Configuration screen,
the Dynamix 2500 data collector automatically goes to the next point
in the list after it finishes collecting the spectrum.
• If you set Auto Advance to Off then the Signature Measurement screen
appears.
TIP The message No signal appears if the Dynamix 2500 data
collector cannot trigger off the tachometer signal to calculate
the speed. If this happens, fix the speed device signal and
connections. The Dynamix 2500 data collector resumes data
collection once it can trigger off the tachometer signal. You
must use a key hole or reflection tape to trigger the
tachometer.