AS 62052.11:2018 pdf free.Electricity metering equipment (ac)- General requirements, tests and test conditions Part 11: Metering equipment (IEC 62052-11:2016 (ED.1.1) MOD).
5.10 Display of measured values
The information can be shown either by an electromechanical register or an electronic display. In the case of an electronic display the corresponding non-volatile memory shall have a minimum retention time of four months.
NOTE 1 Longer retention time of the non-volatile memory should be the subject of a purchase contract.
In the case of multiple values presented by a single display it shall be possible to display the content of all relevant memories. When displaying the memory, the identification of each tariff applied shall be possible and, for automatic sequencing displays, each display of register for billing purposes shall be retained for a minimum of 5 s.
The active tariff rate shall be indicated.
When the meter is not energized, the electronic display need not be visible.
The principal unit for the measured values shall be the kilowatt-hour (kWh), kilovar-hour (kvarh), kilovolt-ampere-hour (kVAh) or the megawatt-hour (MWh), megavar-hour (Mvarh), megavolt-ampere-hour (MVAh).
For electromechanical registers, register markings shall be indelible and easily readable. When continuously rotating, the lowest values of the drums shall be graduated and numbered in ten divisions, each division being subdivided into ten parts, or any other arrangement ensuring the same reading accuracy. The drums which indicate a decimal fraction of the unit shall be marked differently when they are visible.
Every numerical element of an electronic display shall be able to show all the numbers from “zero” to ‘nine”.
The register shall be able to record and display, starting from zero, for a minimum of 1 500 h, the energy corresponding to maximum current at reference voltage and unity power factor.
NOTE 2 Values higher than 1 500 h should be the subject of purchase contract.
It shall be impossible to reset the indication of the cumulative total of electrical energy during use.
NOTE 3 The regular roll over of the display is not considered as a reset.AS 62052.11 pdf download.