@bplus:

Could it be your line #4 is different than your line #4 from before?

Yes, I reduced the number of iterations a little bit and 500 is enough for a 16 digit precision.

I can not explain our difference in the results (The voltage is a good theory ! ;-) )

As conclusion: My result is the better one and give me what I expect. So this all remains as your problem ... ;-)

(Change the voltage!)

Perhaps somebody else has an idea what the reason is for this different program results!

jack has written:

_Pi will only give Pi to double precision, if you want Pi to _Float precision then don't use _Pi(1)

This could be right, but this is not an explanation for our difference, because we both use _PI(1).