Measuring Cross Channel Phase
Note: This feature is not available on the vb5 or vb6 instrument models. The key parameter you need to set is the machine speed. The machine speed can be the actual speed of the machine or the frequency of interest (these are usually the same as the most common fault types you will be looking for occur at the machine's running speed).
- Connect two sensors to the appropriate machine locations.
- From the Main Menu press
Measure then use the left-hand arrow keys to highlight Cross Channel Phase and press 
. - Use the left-hand arrow keys to select a parameter set or press
to create a new one then set your units and machine speed. - You will need to assign two sensors and enable both channels. Press
then press 
Sensor Setup and create or select your sensors as required. Press to continue. - Press to begin measuring both channels.
The instrument will perform a spectral peak search on channel 1 at the entered frequency. The frequency of the actual peak displays at the top-left of the screen in Hz. The instrument then looks at exactly the same frequency on channel 2 and displays the phase difference Delta <value> Ø2/Ø1 (CH2 - CH1). The instrument also displays thephase angles and amplitudes of both channels at your chosen peak frequency.
Last Reviewed: 11/Jun/2009 Source: vbSeries Reference Guide Revision 24 Mar 2009 - pages 76 -78