AN4470 Datasheet, PDF (1/20 Pages) STMicroelectronics – The STPM3x application calibration

AN4470
Application note
The STPM3x application calibration
Introduction
The STPM3x is an ASSP family designed for high accuracy measurement of power and
energy in power line systems using the Rogowski coil, current transformer or shunt current
sensors. The STPM3x devices embed a full set of calibration and compensation parameters
which allow the meter to fit tight accuracy standards (EN 50470x, IEC 62053-2x, ANSI12.2x
for AC watt meters) using low cost components, after a fast calibration procedure explained
in this document.
According to energy meter measurements, the customer has to pay for energy
consumption. The correct operation of the meter, as well as its accuracy and reliability are
very important features both for the customer and the electricity company. That’s why the
quality control of meter is so important and strict.
Special care has to be given both to the design stage and the calibration procedure.
The former allows the right dimensioning of analog front-end components so to fit the
current dynamics and the meter constant pulse. The latter impacts on many meter key
ratings directly.
April 2014
DocID026176 Rev 1
1/20
www.st.com