2006-10-28 07:18:15 · 3 answers · asked by dan 1 in Business & Finance ➔ Other - Business & Finance
I heard it was to do with weight and size but they'd have to be very precise and surely coins lose weight over years by being chipped away etc. I've tried making fake coins but they never get accepted despite me using the same size and weight as a normal coin.
What about notes, how can a machine read notes? Is it by the serial number?
2006-10-28 07:19:00 · update #1
One thing I have seen is that bill scanners have fuzzy logic circuits. They determine authenticity on a pass fail basis. They also have a "courtesy" setting that will pass a bill as genuine if the machine is only reasonably certain. They pass a certain number of bills the machine is not absolutely certain about. Otherwise the machine would loose customers in the way a "cold" slot machine does. Check other answer for coin weight etc. That was a good answer, I think.
2006-10-28 07:35:11 · answer #1 · answered by Anonymous · 1⤊ 0⤋
they go through a coin mech which scans them, it can tell if there weight , size and what there made out of, very hard to fake, sorry
2006-10-28 07:24:34 · answer #2 · answered by simonbeever2000 3 · 0⤊ 0⤋
cos there is a little person inside who seperates the coins
2006-10-28 07:27:23 · answer #3 · answered by Anonymous · 0⤊ 0⤋