Evaluation of results obtained in studying magnetically hard materials

Conclusions

• 1. In determining the MHM samples demagnetization curves on installations with a closed ferromagnetic circuit utilized by different organizations, the obtained errors fall within the limits of ±3% specifiedby GOST 13601-68, with a fiducial probability of 0.95 only for the residual induction measurements and with a fiducial probability of 0.77 also for the coercive force measurements.

• 2. Errors depend but little on the standard size of samples; however, for a 75-mm-long sample the coercive force measurement error was somewhat larger than that of shorter samples.

• 3. In these measurements it is impossible to neglect the probability of blunders; thus, in coercive-force measurements they occurred in 4% of cases.

• 4. The error component whose value for each given installation depends but little on the standard size of the sample should be taken into account when the installation is used for obtaining reference data on the mean value of results obtained in measuring a series of samples.