Charlize PS ripple

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Hello, I am in the final stages of my Charlize build. I went to check my PS to make sure it was 12V and was shocked by the amount of ripple in the supply. I can literally watch it oscillate +/- about a halve of a volt at about 10Hz or so. is this normal for a switching supply, or am I missing something simple? I don't have another one around to test.

My supply is this one:PSU
 
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