AS 62052.21:2018 Electricity metering equipment (ac)— General requirements, tests and test conditions
7.4.3.3 Test of number of operations of low rating d.c. switches (30 V, 30 mA)
The switch shall be tested with the fully assembled tariff and load control equipment under reference condition and shall be connected in a test circuit, which comprises essentially the supply source and a resistive load. The supply voltage to test the circuit shall be set at 34,5 V and the resistive load adjusted for a current of 30 mA.
The number of operations to be carried out has to be at least 400 000.
The changes of state shall be at the rate of one switching operation per second.
The test is passed if, after this test, the switch meets the requirements of 7.4.2.
7.4.5.1 Requirements
The actual integration time of a maximum demand indicator switch shall not differ by more than 1 % from the set value. The maximum demand indicator (MDI) switch shall be active for the reset of the MDI during a time greater than 0,8 % and smaller than 1 ,2 % of the integration time.
7.4.5.2 Test
The maximum demand indicator switch of the tariff and load control equipment is connected to a standard counter/chronometer. The test is performed on 1 00 cycles. The maximum error must be, under these conditions, and after 1 00 cycles, lower than one integration period (<1 %).
7.6.2 General test conditions
Unless otherwise specified, for all these tests the tariff and load control equipment shall be in its normal working position with the cover and the terminal cover in place. All parts intended to be earthed shall be earthed. The value of influencing quantities shall be at their reference values as given in Annex B.
After these tests, the equipment shall show no damage and operate correctly as specified in the relevant standards.
NOTE For insulation class II equipment, to simulate a single ESD event (either by air or by contact discharge),the charge on the EUT should be removed prior to each applied ESD pulse.
For acceptable behaviour during and after the tests, see the relevant standards for particular requirements.