Quote:
Originally Posted by Gelbster
I am confused about the standard test we are discussing. It is unclear to me if the 68F ,0.8 to 1 Ohm test predicts a hot failure or just at 68F.
Obviously if you get zero or infinite ohms it is clear. But what is a typical reading for a CPS like yours which works fine when cold yet fails at some point with heat/heat soak?
That is why I mentioned the hairdryer .No idea if it is necessary. When you receive your replacement, you will have an excellent opportunity for a comparison test.
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Since resistance changes with temperature ie resistance increases as temperature increases, then the standard test simply defines expected resistance values (0.8-1.0 OHM) at a specific temperature (68F) for a functional CPS. This prevents having to define resistance values at different temps.
The heat test simply tests for gross failure when hot such as a break in continuity due to expansion. At least this is my take.
Is this what is confusing?