Cyberattacks against critical infrastructure have become common…
Optical ports provide local access for service engineers during installation or maintenance of energy meters. Households have physical access to their energy meter and might try to get access to the meter software.
The European Accreditation Association has per country one member. This members are allowed to approve test laboratories for calibration.
If a meter has no possibility to open the internal link between voltage and current, the test must be performed with an Isolated Current Transformer (ICT) at each measurement position.
The reference standard is used in energy meter test benches for high precision measurements of voltage, current, phase-shift and frequency. The accuracy class is 0.02.