The big disadvantage is the loss of accuracy and resolution, but some digital picoammeters combine accuracy and dynamic range by combining autoranging and digital log conversion.

这种方法，较大的缺点是损失了准确度和分辨率。然而，也有些式皮安表，采量和变换的方法，这可将准确和宽态范围结合了起来。

The picoammeter reads the current at the last dynode, which is equal to the anode current minus the current flowing to the previous dynode.

皮安计在最后一个倍增管电极处读取电流，此电流等于阳极电流减去流过前一个倍增管电极的电流。