Forum: Reliability & Maintainability Questions and Answers
Topic: Reliability & Maintainability Questions and AnswersTopic Posted by: Reliability & Maintainability Forum (firstname.lastname@example.org )
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998
Original Message:Posted by: Shanta
Date posted: Tue May 20 9:54:10 US/Eastern 2003
Subject: Resistor RACRates Model - PRISM
This question is in reference to the Resistor RACRates Model in PRISM software. It requires a combination of thermal stress (in the form of calculated element temperature) and rated power parameters. Depending on the Element Temperature Calculation option chosen, the user is required to enter different pieces of data. If you select Option 5, you need to enter delta-temperature stress, rated power dissipation and actual power dissipation. What is delta temperature stress (Delta-T)? How is it different from the other 4 options which use ambient temperature, temperature rise, ThetaJC (or ThetaJA)*P?