Rockwell Automation Publication 1441-UM001B-EN-P - September 2012 183
Multi-channel Measurements Chapter 6
• Set up a Collection Specification with Transducer set to Accelerometer.
• Check the Also collect phase data checkbox and set Channel phase to Dual
Channel.
• Set up a magnitude measurement definition for both locations.
Phase Tables
Phase is displayed as a table of magnitude/phase pairs of up to 8 orders. In a dual
channel display, the top trace displays the first channel and the lower trace is the
second. Boost values and cursor moves are applied to both traces, whether
displayed or hidden.
Use the up/down arrows to scroll through the phase table values. When you are
finished collecting and viewing the cross channel phase measurement data, press
Enter to store your data.
The measurement definition is the same for both channels.
Multi-channel Cursor, Display Expand, and Full Scale
Adjustments
For multi channel measurements, the cursor operates simultaneously on all traces
(even if one is hidden). This is also true for Full Scale adjustments using the Up
and Down arrows (amplitude axis). You can use the + and - keys to adjust the
display and expand (frequency/time axis).
Independent Autoranging
For two channel measurements, autoranging is performed simultaneously on
both channels. This lets you use two probes of differing sensitivity. You can
analyze two axes of differing amplitudes while ensuring optimum gain setting for
each channel.
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