Ye. L. Varentsov - Head of Research Group, FSUE FRPC - Measuring System Research Institute n.a. Yu.Ye. Sedakov - (Nizhny Novgorod). E-mail: elvarentsov@mail.ru A. V. Kashin - Dr.Sc. (Eng.), Deputy Chief Designer, FSUE FRPC - Measuring System Research Institute n.a. Yu.Ye. Sedakov - (Nizhny Novgorod). E-mail: aKashin@niiis.ru