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.

这法，较大的缺点是损失了确度和分辨率。然而，也有些字式皮安表，采用自动量程和字对变换的法，这确和宽动态范围结合了起来。