4.2.2 Metrologically relevant parts (functionalities) of smart meters

Considering its scope as presented in 3.1.5 and 3.2.4 , legal metrology should primarily focus on keeping data available for verification of billing.

The smart metering concept concerns the measurement of a cumulated quantity value coupled with the period of measurement and time dependent tariff. This implies that next to the recording of the quantity of the measurand, the time stamp registration is also of interest to legal metrology.

So the parts or modules at least to be included are those involved in the measurand quantity value recording and the time stamp registration. Any function/functionality which could influence these recorded values is of interest.

In principle, there is no need to include those parts concerning the applicable tariffs since this parameter does not tend to be the result of a measurement of its value.

As explained in 3.1.4, it is assumed that for this Report there is no need to deal either with the requirements concerning the accuracy of the individual measurement, or with the effect of influence quantities to which a standalone measurement device is exposed, since this is already covered by existing applicable Recommendations.

This Report will further concentrate on the extra measures it is necessary to take for the smart meter concept, which implies mainly extending to functions concerning adequate data storage and securing of data storage and transmission.