Uploaded December 2012 | Updated September 2026, 1 week ago

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Test of HP E3632a current limiting.

A good power supply should regulate the current fast enough, so that the LED will not die even at the highest voltage. And the HP E3632a does the job.

Had this been done on a bad "El cheapo" supply, the LED would have burned out.

Photos of the supply, front, back, inside, etc.:
ec-projects.com/index.php?side_id=16