Paragraph 2 Non-registration test

Meters shall be tested to ensure that when the current circuits are open and a voltage of 110% of the marked voltage is applied to the voltage circuits, rotors cease to rotate before completing one complete revolution.

Meters shall be tested for non-registration by one of the following methods–

• Method 1

  1. (a)
     1. (i)

        When subjected to the test conditions specified in paragraph 2(1), meters shall not emit more than one output pulse over a minimum time period determined in paragraph (ii);

     2. (ii)

        Minimum test period=60000/k minutes, where k=number of pulses per kWh emitted by a meter.

• Method 2

  1. (b)

     When static meters are fitted with inhibiting circuits, they may be tested for non-registration with a current, which is less than the threshold current in respect of a meter of that type, applied to the current circuits and a voltage of 100% of the marked voltage applied to the voltage circuits of the meters under test. Meters shall not emit more than one output pulse over a minimum time period determined as follows–

     $$\mathrm{Minimum}\mathrm{test}\mathrm{period}=\genfrac{}{}{0.1ex}{}{126000}{\mathrm{V}\times \mathrm{I}\times \mathrm{k}}\text{minutes}$$

     where V=marked voltage, I=total current and k=number of pulses emitted per kWh by a meter.

• Method 3

  1. (c)

     The period calculated for Method 1 or Method 2 may be halved, provided that the meters under test do not emit any output pulses during the period of the test.