• January 3, 2024

    Ring Wave Immunity Test

    ring waveform IEC 61000 4 12

    The IEC 62052-11 Ed.2 comes with a lot of changes for meter type testing. Another new introduced test for electromagnetic compatibility (EMC) is the ring wave immunity test.

  • January 2, 2024

    Electrostatic Discharge Test for Energy Meters

    esd warning sign e1597885223669

    Sometimes it happens that you touch the door knob and you get an electrical shock. It's not dramatically for your body but an unpleasant feeling.

  • October 27, 2023

    The Stability of IEC Standards

    IEC Standard symbol picture

    Meter manufacturers, utility laboratories and type testing institutes have planning security until year 2025.

  • February 26, 2024

    The Critical Change Value

    Aristo Trilog slide rule

    The critical change value indicates the maximum amount of change allowed in the meter's energy registers during disturbance tests without any current flowing in the meter's current circuits.

  • October 26, 2023

    The Optical Test Output and Pulses

    r meter1

    Each electronic energy meter must have at least one optical test output. Commonly its named with flashing pulse diode or similar.

  • December 19, 2023

    Where is the Basic Current?

    meter current range

    In the last 100 years we had a lovely Ib for direct connected meters. Now the name has changed to nominal current In.

  • November 18, 2023

    The Initial Start-Up for Energy Meters

    initial start up time for meters with closed relays

    Electronic energy meters are like small computers. The need some time for starting up.

  • August 23, 2023

    Influence of Fast Load Current Variations

    Fast Load Current Variations Test Profile 1

    The load current can vary frequently with high amplitude. The test conditions in the older versions of the IEC62052-11 have all be static…

  • November 19, 2023

    Repeatability Test for Energy Meters

    CL710K11B

    Another new test introduced by the IEC62052-11 Edition 2 is the repeatability test.

  • October 25, 2023

    Influence of Self Heating

    r DTS718 1

    We need to figure out whether the occurring internal heat is causing a temporary error drift above the allowed limits for variation.

  • January 4, 2024

    No Load Test for Energy Meters 2020

    CL3000

    With publishing of the Edition 2 of IEC62052-11 the minimum run time calculation formula has changed.

  • November 21, 2023

    Odd Harmonics in the Current Circuit

    phase fired waveform 45°

    Two more tests for odd harmonics have been added to IEC 62052-11 edition 2.