Testing a phono stage

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How do i go about testing a phono stage with a 1khz sine wave recorded from my pc onto my sony mini disc, and then using digi volt meter.
Iv'e done some preliminary test's with the meter set on dc mv on the input and found this...left ...minus .018 and right...plus.018?
Cant quite work that one out..surley it must be plus volt's on both channels.
 
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