State primary special standard of impulse current unit in the range from 1.0 to 1.0·105 A GET 202-2024

Metrological assurance of immunity tests to impulse currents of natural and artificial origin is an urgent task in the development and production of aviation, rocket and space equipment and telecommunication equipment. The State primary special standard of lightning discharge impulse current unit GET 202-2012 provided the unity of measurements of impulse current parameters in the amplitude range from 1 to 100 kA and the time range from hundreds of nanoseconds to units of milliseconds. In order to provide metrological support for measuring instruments for impulse currents of electrostatic discharges and switching currents (rise time of the transient response of at least 1 ns, measurement range from 1 to 200 A), GET 202-2012 underwent a modernization cycle in 2020–2023. As a result of the modernization, the State Primary Special Standard of the unit of pulse current in the range from 1.0 to 1.0·10⁵ A GET 202-2024 was approved, the lower limit of the range of reproduction of the unit of pulse current of which was 1 A with a pulse front duration of no more than 1 ns. Thus, the problem of ensuring the uniformity of measurements of electrostatic discharges and power switching impulse currents parameters was solved. To achieve the specified characteristics, GET 202-2024 includes devices for reproducing current pulses based on semiconductor keys and reference current shunts with a short rise time. The composition, structural diagram, technical and metrological characteristics of GET 202-2024 are given. GET 202-2024 ensures the uniformity of measurements of the parameters of pulse currents of electrostatic discharges, partial lightning discharges, as well as pulse currents generated by switching processes when solving problems of electromagnetic compatibility, creating new types of materials and coatings, in geophysical and meteorological research and observations, in healthcare.

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