http://tangentsoft.net/audio/input-cap.html
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Originally Posted by tangent
How Do You Measure DC Offset?
Put your meter on the DC millivolts scale and measure from ground to each channel. It's most useful to measure this at the output of the amp, while it is plugged into the source. If your amp uses mini jacks (1/8"), put a mini-to-mini cable in the jack and measure from the long "sleeve" part to the "tip" and "ring" parts out at the end of the plug. With 1/4" jacks, it's a bit tougher because 1/4" to 1/4" cables aren't very common. Instead, it's simplest to measure between the solder lugs on the inside of the amp. If you don't want to open the amp up and can't find a 1/4" patch cable, a 1/4" to dual RCA adapter will also work: just measure from the inside of each RCA jack to the outer shell. You can also measure DC offset at the source. Remember to multiply this by the amp's gain when deciding if it's acceptable. |
