Picoampere current amplifier pA级电流放大
You must carefully choose insulation and apply guarding potentials, and you must use an amplifier with picoampere input-bias currents.
必须谨慎选择绝缘方法和使用保护电位，必须使用输入偏置电流为微微安级的放大器。
The leakage of the 1n3595 diode is generally less than one picoampere even with 1mv of forward bias, so the circuit won't interfere with measurements of 10pa or more.
即使在1 mV的正向偏置之下，1n3595的漏电流一般会小于1皮安，此电路不会影响10pa或更大电流的测量。
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