I measure an upstream TOF and a downstream TOF and calculate delta TOF. Actually it' s quite steady - I get a delta 25 - 45 picoseconds. But even a difference in 10 picoseconds results in a big difference in flow rate calculation.
for example:
Delta (in picoseconds) - Flow rate (M3/H)
29 - 2.66
30 - 2.82
33 - 3.03
38 - 3.48
Is it because my calculation wrong? Or should it be a deviation less then 10 picoseconds?
Is it real to achieve such a tight measuring +/- 10 picoseconds?
