I imagine that there is no most common frequency for this, it is probably entirely dependent on the device in question.
http://en.wikipedia.org/wiki/Dark_curren...
The phrase "dark current" probably refers to some kind of light sensor device where a small amount of current still flows when it is in complete darkness...for example an Image Orthicon tube looking at a black object.
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CURRENT CANNOT BE SEEN AND NO SUCH THING CALLED DARK CURRENT.
What is the average/most common frequency of dark current?
