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minimum reliable low currents


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i need to know what is the lowest current that is reliable for cases such as:

a.) charging a capacitor
b.) when the current is being read by an instrument such as an ammeter
c.) logic signals

what i mean is that even outside normal conditions -- exposed to hot summers and cold winters, being touched by bare hands when testing, or when it's humid, etc -- what are the minimum low currents that will cover a, b, c above?

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