Before performing our overload tests we always like to test first if the over current protection (OCP) circuit is really active and at what level it is configured.

We configured +12V1 input from our load tester with a low current (1 A) and increased current on +12V2 input (which was connected to the power supply +12V4 rail through the EPS connector) until the power shut down. This happened when we tried to pull more than 22 A, so OCP was active and set at 22 A. Funny enough with our power supply fully loaded we could pull more than that and the power supply didn’t shut down. See test nine in the previous page.

Then we tried to pull even more power from Rocketfish 700 W. We were brave enough to try pulling 770 W from it, as you can see in the table below.

Efficiency was very low, 71%. See how we were pulling over 1,000 W from the wall in order to generate 770 W. Noise level was almost touching the limit, at 100 mV on +12 V outputs.

Short circuit protection (SCP) worked fine for both +5 V and +12 V lines.