The establishment of EVISA is funded by the EU through
the Fifth Framework Programme (G7RT- CT- 2002- 05112).
Supporters of EVISA includes:
In the experimental measurement of an exact mass, the percent accuracy is calculated as the (true mass - observed mass)/true mass x 100%. The percent accuracy is often expressed in parts per million (ppm). For example, 0.01% accuracy is 100 ppm. A 100 ppm accuracy for an ion with a mass of 1000 Da is 0.1 Da.