MAGNET CHARACTERISATION TECHNOLOGY COMPARISION TABLE

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Technical Specification PFM Technology VSM Technology Permeameter Technology
Measurement Method
Open Loop
Open Loop
Closed Loop
Speed of Measurement
<1 Second(4) 5-30 Minutes
5-15 Minutes
Shapes of Magnet
Any Any 2D Extrusions(1)
Magnet Material
Any Low Field(2)/Any(3) Low Field(2)
Magnet Size Any Small Small
  1. Must fit pole pieces
  2. Low field materials are those with saturations lower than 2.4 Tesla. They include ferrite, alnico, Alcomax etc.  They exclude full loop measurement, NdFeB, SmCo5 and Sm2Co17
  3. Super conducting VSM only
  4. Excluding loading / unloading time