Component Specifications: Trust or Verify?

摘要

It's easy to forget that no two components or devices are exactly alike. This is fairly obvious with common leaded resistors, given the tolerance marking is hard to miss -gold 5%, silver 10%, none 20% for four-band resistors. In other cases, it's less obvious. For example, in working with batches of Arduino microcontrollers, I've noticed small but significant differences in the analog-to-digital conversion accuracy from one microcontroller to another.