When analyzing polyphase motors, it is important to make measurements with equipment suited for the application. Watt measurements or VAR measurements should be taken with a two element device. Power factor should be determined from the readings of both measurements. When variable speed drives are encountered, it is always preferable to take measurements on the line side of the controller. When measurements are required on the load side of the controller, the instrument specifications should be reviewed and if there is a question on the application the manufacturer should be contacted.7

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