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Testing Methodology Discussion Questions and comments regarding the testing methodologies used on

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Old 03-15-2017
OneTreeHill OneTreeHill is offline
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Default Ripple Measurement

Hi folks. I've gathered all the equipment for the power supply for a short time. My first victim HX750i. I did all test and last test ripple measurement. But I think it's a problem with measurements. Especially 12V channel.

OSC Rigol 1054z(Hacked 100 MHZ) I build own DC Load and Text Fixture. I followed intel atx spec.

Channel 1 -12V- Channel 2 -5V- Channel 3 -3.3V- Channel 4 -5VSB-

%0 Load

%10 Load

%20 Load

%30 Load

%40 Load

%50 Load

%60 Load

%70 Load

%80 Load

%90 Load

%100 Load

%110 Load

CL 1

CL 2

What are you thinking? Have you observed an abnormal condition in the results?
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Old 03-15-2017
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crmaris crmaris is offline
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Its switching controller operates at Missing Cylce (MC) mode under light loads and this increases ripple during your 10% test. However as it seems you should calibrate your loads since your 10% load is actually lower, because I didn't have this ripple in my HX750i sample with true 10% load. Else in your sample the controller is tuned slightly different since with the use of the proper circuit its MC mode can be adjusted. I have also noticed this in the HX1000i review and in general most LLC topologies have it under light loads.
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