AN2299 Datasheet, PDF (1/26 Pages) STMicroelectronics – Fast digital calibration procedure

AN2299
Application Note
Fast digital calibration procedure
for STPM01 based energy meters
Introduction
This document describes the fast digital calibration procedure enabled by STPM01 in solid
state energy meters.
Based on energy meter measurements the customer gets a bill and has to pay for energy
consumption. It is in the interest of the customer and the electricity company that the meter,
which counts the energy consumption, is working properly and accurately.
The quality control of the meters therefore is highly important, since the main requirements
that a meter needs to fulfill are accuracy, cost, manufacturability and reliability. This explains
the trend of moving from traditional mechanical solutions to solid state ones (electronic
meters). Electronic meters allow high accuracy over a wide current dynamic range, low
power consumption, reliability, robustness and gearless. They do not require precision
mechanics and easily enable new functionalities (AMR: automatic meter reading, multi tariff
billing, tamper proofing, prepayment meters, load shedding, power outage detection…).
Special care must be dedicated to the calibration procedure, because it impacts directly on
many key features of the meter, such as accuracy, cost, manufacturability and reliability.
Due to its internal structure and features, STPM01 allows a more effective and innovative
calibration procedure, which will be explained in this document.
Advantages of this procedure are:
● reduced calibration time
● no need for re-calibration (calibration parameter can be written in a permanent way)
January 2006
Rev2
1/26
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