Apparently, calculating the resistivity of parallel elements is beyond the capability of a vendor to understand.
If you’re required by a spec to test an element to no less than 3.5 W/in^2, and you’re testing these elements in parallel so as to save on the number of power supplies you’re devoting to this burn-in, don’t you find the highest resistance in the parallel lot, then calculate the voltage needed to take that element to said energy density value, and then apply said voltage to all units?
Apparently not. These clowns just grabbed the first element they came to, checked resistance, ran the numbers, and went on with life.
:sigh: Any time you question these vendors on how they do their jobs, their first, defensive reply is, “We’ve been doing this for N years!” The reply going off in my head is always, “And you’re still in business?”
When an aerospace engineer who passed Circuits I only by the grace of the instructor—hey, I had the flu that semester and missed a midterm, and my “makeup” was just having the next midterm count twice, but of course, that was the midterm everyone bombed—can figure out that you’re fooling with the numbers, you’re in trouble.