Scythe Chouriki 2 Plug-In 850 W Review 3

Scythe Chouriki 2 Plug-In 850 W Review

Value & Conclusion »

Ripple Measurements

In the following table you will find the ripple levels that we measured on the main rails of SPCR2-850P. According to ATX specification the limits are 120 mV (+12V) and 50 mV (5V & 3.3V).

Ripple Measurements
Test12 V5 V3.3 VPass/Fail
20% Load53.4 mV11.2 mV13.2 mVPass
40% Load62.4 mV12.6 mV15.8 mVPass
50% Load68.8 mV13.8 mV17.2 mVPass
60% Load75.2 mV14.2 mV17.6 mVPass
80% Load87.8 mV15.6 mV19.8 mVPass
100% Load99.6 mV15.8 mV20.8 mVPass
Crossload 172.4 mV22.8 mV23.2 mVPass
Crossload 297.8 mV11.2 mV16.8 mVPass

Ripple suppression on the minor rails is quite good but at +12V is lousy. In a modern PSU we expect ripple at +12V to not go beyond 70-80mV in all cases, but here it reached 100mV. Sirtec has to focus more on ripple/noise suppression with their implementations, since the competition is years ahead at this field.

Ripple at Full Load

In the following oscilloscope screenshots you can see the AC ripple and noise that the main rails registered (+12V, 5V, 3.3V). The bigger the fluctuations on the oscilloscope's screen the bigger the ripple/noise. We usually set 0.01 V/Div (each vertical division/box equals to 0.01V) as standard but at this case we were forced to use 0.02 V/Div at all screenshots, since ripple was very high at +12V.



Ripple at Crossload 1

The order of images is +12V, 5V and 3.3V.



Ripple at Crossload 2

As above the order of images is +12V, 5V and 3.3V.

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