| 摘要 |
FIELD: measurement equipment.SUBSTANCE: angle of sample rotation is determined in a rotary magnetic field developed by a magnetic assembly in the form of three coils of a three-phase stator, they measure current values, by values of the rotation angle and current they determine specific electric resistance, at the same time measurement of current in one of coils is carried out by means of a multimeter, and zero values of current in any coil are used for alarm on violation of magnetic field parameters. A device for realisation of the method includes a source of a rotary magnetic field with a magnetic system in the form of three coils of a three-phase stator, current sensors, connected to coils, and a computer, an additional current sensor, a multimeter and an alarm device, comprising three subtracting devices, a summator, a threshold element, an optical indicator, inlets of the multimeter are connected with an additional current sensor, the outlet of the multimeter is connected with one of the computer inlets, inlets of each subtracting device are connected to outlets of two current sensors, connected to coils, outlets of subtracting devices are connected to inlets of the summator, the outlet of which via the threshold element is connected with the optical indicator, the outlet of the threshold element is the outlet of the alarm device and is connected with the other inlet of the computer.EFFECT: provision for reduction of measurement time, simplified experiment with preservation of required accuracy.5 cl, 1 dwg |
