This guideline applies to variable-area flowmeters of any design. An electrical output of the measuring system shall be considered separately in the documentation. The manufacturer shall state whether any separate measuring errors must be taken into account for the output or whether the measuring errors due to the electrical output are included in the values given for the system.
VDI/VDE 3513 Blatt 2-2008 Referenced Document
DIN 1319-1:1995 Fundamentals of metrology - Part 1: Basic terminology
DIN 1319-2:2005 Fundamentals of metrology - Part 2: Terminology related to measuring equipment
DIN 1319-3:1996 Fundamentals of metrology - Part 3: Evaluation of measurements of a single measurand, measurement uncertainty
DIN 1319-4:1999-02 Fundamentals of metrology - Part 4: Evaluation of measurements; uncertainty of measurement