Electromagnetic field measuring device

Epstein standardised measuring frame for controlling the magnetic sheets in compliance with IEC 404-2 / -3 that Vettiner created fifty years ago. Full description Vettiner is interested in measures of magnetic sheets for over half a century and Mr. Vettiner, founder of the company in 1933 is causing NFC 28-911 standards, Euronorm 118-1987 and IEC 404-2, 404 -3 & 404-10. Formerly limited to 50 & 60 Hz power frequency, the evolution of electric motors to variable frequency gradually led to the need of monitoring the performance of magnetic steel sheets over a frequency range up to a few kHz with sinusoidal signals but also with classic geometric shapes of squares types, triangular or adjustable width impulse symetrical shifted phase. The current development of power supplies with chopped signals up to the MHz should reinforce the need for research and development of measures on magnetic sheets in the coming years. Current requirements call for magnetic measurements at high inductions, requiring power for testing of increasingly sophisticated, programmable amplitude and frequency, with automatic control of the form of high voltage and power measurements with cos f extremely low (<= 10-4.