There are no standards. If one was to observe what standards are in place from state to state or from local to local, all the so-called 'standards' would be different in each location, and would depend on who has control (demonrat or repub) of the voting place. This will never change, no matter what the feds say or do.
You make an extremely interesting point. The states are supposed to be in charge of their voting processes but the feds are interceding inappropriately in the area of electronic voting, which has extremely low reliability and wouldn't pass muster if common standards were applied.
Thank you for your profound insight.