SU367397A1 - ALL-UNION | P ^ T? YTSH ^ ''> & ^ * '"' - • BHBni ^ oj ^ ' - Google Patents

Description

one

The invention relates to the field of computing, in particular to magnetic storage and logic devices.

The known devices (characterographs) are used to measure the characteristics representing the dependences of the amplitudes of the signals e. d. on the output winding of the core, from the amplitude of the current pulses acting on the core, comprise: a control unit; block shaper currents; a unit for monitoring and outputting a horizontal scan of a two-coordinate indicator of the current value of a pulse of alternating magnetic reversal of the core; linear amplifier and integrator. The output of the integrator produces a voltage proportional to the current amplitude value of the signal e. d. core. This voltage is applied to a vertical scan of a two-coordinate indicator. According to the graphs obtained on the two-coordinate indicator, it is possible to determine the total core magnetization current.

However, such devices have a large measurement error due to the output and processing of graphs on two-coordinate indicators.

The purpose of the invention is to improve the accuracy of measurements of the current of complete magnetization reversal of cores with non-destructive readout.

This is achieved by introducing an additional shaper of alternating magnetization current pulses connected to the core magnetize winding and amplitude discriminator, signals separated in time, one input of which is connected to the output winding, and the output to the key I. The other key input is connected to the output of the pulse generator, and the output is connected to the inputs of the main and additional shapers of the stepped magnetization reversal current pulses.

FIG. Figure 1 shows a block diagram of a device for measuring the current of complete magnetization reversal of cores with non-destructive readout.

It contains: unit / control; current pulse generator set 2 and polling 3; main 4 and additional 5 shaper step pulsers of magnetization reversal current; 6 pulse generator; the key "And 7; digital display unit 8; an annular core 9 with diametrical holes; winding interrogation 10 and magnetizing 11; output winding 12; amplitude discriminator

13 signals separated in time; counters 14 and 15, code-to-voltage converters 16 and 17; generators 18 and 19 current.

FIG. 2 shows the program of current pulses acting on the core, where / i,

/ 4 - pulses of the core installation in

initial magnetic state; / g, / 5 - pulses of magnetic reversal of the core; Is, h - polling current pulses; h 6 - amplitude of signals read by e. d. D is the difference of the amplitude decrements of the signals e. d.

FIG. 3 shows the dependence of the amplitude E of the signal e. d. core from the amplitude of the current reversal magnetization pulses 1t, where / s is the coercive current; / "Is the current of the total magnetization reversal of the core; D / is the increment of the magnetization reversal current; A is the signal increment e. d. of the core with an increase in the magnetization current by the value of D /.

The outputs of the control unit 1 are connected to the inputs of the generators 2, 3, 18, 19 of the emulsions of the currents and the amplitude discriminator 13 of signals separated in time. The generator output 3 pulse current survey is connected to the winding 10 of the survey. The outputs of the generator 2 current pulses of the installation and the formers 4 and 5 speed pulses of the current of the magnetization reversal - to the winding 11 magnetization. The inputs of the key “7” are connected respectively with the output of the generator 6 pulses and the output winding 12, and the output with the inputs of the 4 and 5 stepped pulses of the magnetization current. The inputs of the digital display unit 8 are connected to the outputs of the counter 14, which is part of the imaging unit 4.

The control unit 1 sets the time sequence of operation of current generators 2, 3, 18, 19 and the amplitude discriminator 13 of signals separated in time.

The current generators 2, 3, 18, 19 produce, respectively, the pulses of the currents / i and 1, / 3 and / 6, / 2. / 5 according to the program shown in FIG. 2

The current pulses of the installation / i and / 4, having the same amplitude, translate the core material into a magnetic state corresponding to the limiting hysteresis loop. The amplitude of the pulses of the magnetization reversal / a and / 5 increases discretely from zero to a value sufficient to completely reverse the magnetization of the core. In this case, the current values of the amplitudes of the pulses of the reversal magnetization currents are related by

one,.

Surge current pulses / S and / e, having the same amplitude, affect all layers of material of the core magnetic core under study. At the moment of action of the current interrogation pulses / 3, / 6, signals e appear on the output winding of the core. d. 3, Her, reflecting the magnetic state of the core after the exposure of the previous pulses of the installation and magnetic reversal currents.

In order to obtain step-like pulses of the magnetization current, the input stages of the formers 4 and 5 are made in the form of digital-analog converters (counters 14, 15 and converters 16, 17 of the code-voltage, which can be set in N different states. Each of these states It corresponds to a predetermined current value at the output of current generators, formers.

The one-to-one correspondence between the state of the input cascade of the main driver of 4 step-like pulses of the magnetization reversal current and the amplitude of the current at the output of the generator 18 is displayed by the digital indication unit 8.

Switching the input stages of the formers 4 and 5 from one state to another and at the same time a consistent increase in the amplitude of the pulses of the magnetization reversal / 2. A / 5 is carried out by a pulse generator 6 in case the key < 7 is opened. By the state of the key, the amplitude discriminator of 13 signals separated in time, at the input of which signals e come, turns off. d. h, core 9 b, induced to the output

the winding 12 at the time of action of the current survey pulses / 3, / 6. The amplitudes of the signals e. d. EZ, b reflect the magnetic state of the core 9 after its reversal, respectively, by the currents / 2, / 5. From the plot of the amplitude E of the signal e. d. core from the amplitude of the pulses of the current reversal / t (see Fig. 3) shows that

incomplete remagnetization and core () signal amplitude e. d.

and the difference of the amplitudes of the signals e. d. .

While the difference of the amplitudes of the D signals e. DS in and 2 are greater than zero, the amplitude discriminator 13 gives the permitting level

to the input of the key & 7, which as a result appears open at the moment of the triggering of the pulse generator 6. The pulse passed through the key switches the input stages of the formers 4 and 5. The amplitude of this is

pulses of magnetization reversal / a, / 5 and the amplitude of the signals e. d. h and b increase, with the difference of the amplitudes of the signals e. d. D tends to zero. As soon as the amplitude difference of the D signals

er d. b and c will become zero, the amplitude discriminator will provide a prohibitory level to the key input, which will close by the time the pulse generator triggers. As a result, the input of the counters 14 and 15

The impulses do not pass and a further increase in the amplitude of the magnetization reversal currents (2, 5) stops.

The steady state of the counter 14 is displayed by the digital display unit 8 as

the amplitude of the total current of magnetization reversal of the core.

Subject invention

A device for measuring the total magnetic reversal current of the cores, comprising a control unit, an installation current generator, a survey current generator, a driver for stepped magnetization reversal current pulses, a digital display unit, and a pulse generator, characterized in that

measurement accuracy, it is equipped with an additional driver of stepped reversal current reversal pulses connected to the core magnetize winding, amplitude discriminator of signals separated in time, one input of which is connected to the output winding, and the other input is connected to the output of the pulse generator and the output is connected to the inputs of the main and additional drivers of stepped current pulses.

Fig 2

L

FIG. 3