Hold-Up Time

Hold-up time represents the duration for which a PSU can maintain stable output as defined by the ATX specification without input power. This is very important when the quality of your electricity varies, and there are short drops in the supply (dips or brownouts).

In the oscilloscope screenshots below, the blue line is the AC input mains signal, the green line the "Power Good" signal, and the yellow line the +12V rail. The measured timing variable is listed as ΔX.

Hold-Up Time

The hold-up time is too long, and there is no power ok signal to measure.

Inrush Current

Inrush current, or switch-on surge, refers to the maximum, instantaneous input current drawn by an electrical device when it is first turned on. A large enough inrush current can cause the tripping of circuit breakers and fuses and may also damage switches, relays, and bridge rectifiers. As a result, the lower the inrush current of a PSU right as it is turned on, the better.


Inrush current is low with all voltage inputs I tried.

Protection Features Evaluation

OCP at +12 V is incredibly high, and the same goes for OPP! This is crazy for a power supply that cannot handle 350 W for a prolonged period of time without active cooling.