... .Various test coils 4.Test: magnetic parameter, Br, Hcb, Hcj, (BH)max, Hk and so on DX-4DMT Automatic Hysteresis Graph Test System DX ... -4DMT automatic hysteresigraph system accords with the standard permanent magnet test system, GB3217-92, used to measure ... protection technology and intellectual control DX-4DMT Automatic Hysteresis Graph Test System