... dynamic magnetic hysteresis loop of oriented and non-oriented silicon steel under the condition of 50 Hz, 60 Hz, ... completed.General FeaturesTesting sample varieties: hot rolling, cold rolling silicon steel materials, permalloy, amorphous and nm crystal. ·Testing sample ... Hz frequency, use 25 cm Epstein Frame to measure silicon steel sample, technical indices as follows: Parameters measuredBm (%)Hm ...