Permeameter

This split-coil permeameter was developed at CERN (ISR) to measure magnetic permeability of steel samples at room temperature. The samples are rings machined out of the steel to be measured. They are placed between the top and the bottom parts of the permeameter. Silver plated sliding contacts complete the excitation and the flux-measuring electrical circuits when the top half of the apparatus is closed down to the bottom part. In the shown permeameter a max. magnetizing force of 24000 A/m is reached with a 40 A excitation current. The results are B vs. H plots. Several copies of this instrument were produced and used to measure the magnetic permeability of the steels for ISR, SPS, LHC and many other magnets. Ref.K.N.Hemrichsen, Permeameter,Proc. 2nd Int. Conf. on Magnet Technology(1967). See also photos 7708103,7708551X.