SU328404A1 - DEVICE FOR MEASURING TIME ~ ^ ^ ': MAGNETIZING FERROL \ AGRICIAL CORDERS - Google Patents

Description

The invention relates to devices for measuring the pulse parameters of magnetic cores - ferrite and metal, thin film, etc.

The known devices for measuring the magnetization reversal time directly from the transient-pulse curve of the emf. or the magnetic flux mecha- nism curve — contain a master oscillator, alternating current magnetisation pulse generators, a test core with windings, and a calibrated measuring instrument for observing the transient curve using an oscilloscope or an integrator with a visual or digital output.

Such devices are characterized by measurement accuracy limited by the accuracy of oscilloscopes and integrators.

The proposed device for improving the accuracy of measurements is equipped with a magnetic flux indicator connected via a key controlled by a delay line to the measuring winding of the core under study, the input winding of which is connected to the output of the master oscillator simultaneously connected to the input of the delay line through pulse current generator.

remagnichi.vanp time on the duration of the magnetizing current pulse in fig. 3 - time sequence of pulses when measuring the time of conditionally complete reversal (in Figs. 2 and 3 above are current pulses, at the bottom - EEDS pulses, the stroke indicates the switch-on time interval (gating interval); 4 - hysteresis characteristic B (H) of the ferromagnetic core.

The device contains a master oscillator /; generators of 2, 3 and 4 impetizations of the magnetization reversal current (their number is determined by the method used for measuring n molset

be any); the test core 5 with input 6 and output 7 windings; zero indicator 8 flow (for example, a voltmeter); a control key 9 of any known type (for example, an electronic strobe stage); line

10 delays.

When measuring the magnetization reversal time by the duration of the magnetization reversal current, generators 2, 3, and 4 form in a winding 6 a periodically repeated sequence of current pulses 11, 12, and 13. Pulse 11 serves to set the test core to its original state; pulse 12 is a read pulse of calibrated duration, and pulse 13 is a fully charged pulse.

14-19 emf The key 9 is turned on for the duration of the induction of pulses 18 and 19. During the measurement, the pulse duration 12 current, as it is read, gradually increases. As soon as this duration reaches a certain limiting value, sufficient for a full (within the sensitivity of the null indicator) magnetic reversal of the core from the state-Br to the state + Br, area of pulses 18 and 19 emf. within this sensitivity, they become equal to each other, since the additional current pulse 13 does not magnetise the core. The limit value of the current pulse readout time is the magnetization reversal time t.

With this measurement, the main measuring device is the read duration calibrator in one of the current generators (for example, in generator 2, which allows forming and calibrating this duration with an accuracy of one tenth of a nanosecond, i.e., increasing the accuracy of nonremagnetizing order but compared with known devices.

When measuring the time of a conditional-complete reversal of the -S, state. by the value of the differential 2 V, - in the winding 6 a periodically repeated sequence of current pulses 11 and 20 is formed. Pulse 11 serves to set, and pulse 20 is the read pulse of non-calibration duration, which is known to be longer than the duration of the transient process. Key 9 is turned on at a certain time interval after the start of the read current pulse 20. This interval is gradually increased during measurement with the help of line 10 of the delay. The value of the interval at which the null indicator 5 is triggered (the shaded portion of the positive impulse 21 emf becomes equal in area to the negative impulse 22 electromotive force), and there is a conditionally-complete magnetization reversal Tup. The main measuring device in this case is a calibrated gauge of a variable delay line 10, which can be performed with high accuracy.

As in the previous case, the zero-indicator 8 almost does not reduce this accuracy.

With the help of the proposed device, in addition to t and Tup, other time parameters can also be measured during magnetization reversal,

for example, the time of reversible magnetization reversal, and it is also possible to measure it in others, for example, when reversing magnetization from an arbitrary state of BC, etc.

Subject invention

A device for measuring the magnetization reversal time of ferromagnetic cores; - a magnetic flux indicator connected via a switch controlled by a delay line to the measuring winding of the core under study, the input winding of which is through a generator Orae magnetization reversal current pulses connected to the output of the master oscillator, connected both to the input of the delay line.

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