New IEEE Standard - Inactive - Withdrawn.Withdrawn Standard. Withdrawn Date: Mar 21, 1991. The purpose of this document is to provide guidelines for the application of temperature measurement techniques in measuring the operating temperature and temperature rise of electrical machines, instruments, and apparatus in common use. The guidelines are limited to measurement of temperatures below 500 C; however, some measurement techniques described herein are capable of measuring temperatures above 500 C, and these may be used at the higher temperatures after the validity and safety of the technique for the temperature involved have been confirmed.