Lissajous











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		The Lissajous Utility updated 2/20/98 *What is The Lissajous Utility?* The Lissajous Utility, found in version 1.06 above, is used to verify encoder signals after an AutoTune. Although some signal verification can be done with the "After AutoTune" part of the Align Encoders Utility, the Lissajous Utility will do a more thorough job. *More about the Lissajous Utility* The Lissajous utility is a more advanced version of the "After AutoTune" align utility. Whereas the Align utility only displays signal amplitude, the Lissajous Utility can provide both amplitude information as well as offset information. This is graph is the same graph as one would see on an oscilloscope and provides the technician accurate information about the encoder. *When do I run the Lissajous Utility?* The procedure is: 1.) Check encoders' signal levels using the Align Utility's "Before AutoTune". 2.) Run AutoTune 3.) Verify the encoders' signal levels using the Align Utility's "After AutoTune". 4.) Verify the encoders' signal levels again using the Lissajous Utility. 5.) View EEPOTs using EEPOT Dump to look for possible problems. 6.) Verify the Tune in the Measurement mode. *How Do I Get There?* Press the service utilities button. Enter in password. This is the last 5 digits of the machine serial number reversed. Press the Done key Press the Lissajous button. *Verifying Encoder Signals* Unlike the Align Utility, there are no minimum tolerance pass/fail dotted lines. Instead the technician must view the graph anyalitically. One is looking for nice round graphs centered around the middle screen which pass through or near the 4 tic marks. After viewing 10 encoders or so, a technician will become familiar with what is a good signal and what is a bad signal. For example, an encoder which is only showing a half circle, slammed up against the edge of the graph is bad. Or, if the circle is only half the diameter of the tick marks, then there is also a problem. *Helpful Hint* Be sure an move very slowly, otherwise, because the RefleX Controller is not as fast as a modern day oscilloscope, the graphs will distort, creating an + or - 45 degree ellipse.

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