Ripple Measurements

In the following table you will find the ripple levels that we measured on the main rail of the X-MAN 90W.


Apparently the design and the components Huntkey used to shrink the dimensions of the power adapter and keep its power output high, greatly increasd the ripple noise at +19V. Taking into account the ripple limits that the ATX spec sets for +12V and 5V, which are pretty high for contemporary PSUs, the X-MAN clearly fails at +12V through 60% - 100% load tests. The max recorded ripple value of 148.2mV is something we rarely see and means bad news for the notebook that this adapter will feed. However here we should note that all notebooks feature a filtering circuit which will suppress the ripple of the incoming DC voltage so that ripple will be effectively lowered. Neverthess the lower the ripple of the incoming DC voltage the better, that's for sure.

Ripple Screenshots

In the following oscilloscope screenshots you can see the AC ripple and noise that the main rails registered. The bigger the fluctuations on the oscilloscope's screen the bigger the ripple/noise.

60% of Max Rated Load

80% of Max Rated Load

Full Load