A comparative study on the calibration of pole caps for a magnetic microbalance

Calibration curves for 177 mm Henry profile pole caps of a Faraday microbalance magnet are obtained from absolute susceptibility measurements. The pole caps are at gaps of 4.0, 4.5 and 5.0 cm for maximum magnetic field strengths from 2.18 to 6.90 kOe. Typical results on few standard substances are compared with reported values. An error less than 3% can be achieved for samples of limited size and sufficiently free from ferromagnetic impurities.