JPH02143179A - Measuring instrument for hysteresis - Google Patents

Abstract

PURPOSE:To accurately measure hysteresis characteristic by constituting with a pulse oscillator, impressing signal generator with up/down counters, and discrimination device for the output signal from a circuit. CONSTITUTION:A pulse generated from the pulse oscillator 3 is impressed to the counter 4 and up-counted. The output of an D/A converter 8 is increased little by little every time the counted value is changed by one. The output of an electric/magnetic circuit 1 which is impressed to the electric/magnetic circuit 1 through an amplifier 15 is supplied to the discrimination device 5 and compared with a reference voltage 14. When the output is increased rapidly beyond the reference voltage 14, the signal is made to be an operation stopping signal for the counter 4 through a switch 9. The counting operation of the counter 4 is stopped, and by the terminal 13 for data read-out timing signal, an indicated value on the counter 4 is read out with a control circuit 12. Thus, the hysteresis characteristic can be accurately measured with the accuracy based on the settlements of the pulse oscillator and the up/down counters.

Description

[Detailed Description of the Invention] [Required 4Q] The present invention relates to a device for measuring the hysteresis characteristics of a circuit using an applied signal that can be determined with high precision. The object of the present invention is to provide an apparatus for measuring the hysteresis characteristics of a circuit having hysteresis characteristics, which comprises an applied signal generator using a pulse oscillator and an up/down counter, and a discriminator for the output signal of the circuit. and controlling the operation of the up/down counter by the output of the discriminator.

[Industrial Application Field] The present invention relates to 'ATL' which measures the hysteresis characteristics of a circuit using an applied signal that can be determined with high precision.

Conventionally, the signal applied when measuring the hysteresis characteristics of an electric/magnetic circuit in detail has been extracted from a high-resolution voltage source and raised or lowered step by step. Therefore, it is expensive to provide a voltage source and measurement takes a long time, so there was a need to develop an alternative technology.

[Prior Art] Conventionally, when measuring the hysteresis characteristics of an electric/magnetic circuit, a high-resolution voltage source is required for the applied signal. A voltage lower than a predetermined value is applied, and the applied voltage is increased one step at a time while detecting the output. FIG. 3 is a diagram showing the human output characteristics of an electric circuit. The voltage Vr when the output suddenly changes to Op is the rising voltage of the hysteresis characteristic.

When a voltage higher than that voltage is applied, the output Op usually does not change. Furthermore, when the applied voltage is lowered one step at a time from a high value, the output Op does not change even if it reaches a voltage even lower than the rising voltage Vr, and the output drops to a considerably lower value Vd. Go down. Rising and falling applied voltage Vr.

The hysteresis characteristics of the electric/magnetic circuit can be determined by Vd.

[Problems to be Solved by the Invention] In the conventional device, making one step as small as possible makes the configuration of the voltage source complicated and therefore expensive. In addition, since such devices are configured to be controlled by a control processor, it is necessary to go through the process of a determination routine in order to determine each time whether the output when the applied voltage is manually applied has reached Op. In short, it took a long time to install the device and start measuring, and it also took a long time to measure and then raise and lower the device one step.

Note that when one step is made rough and a power supply device that does not have high resolution is used, there is a drawback that accurate hysteresis characteristics cannot be measured.

SUMMARY OF THE INVENTION An object of the present invention is to improve the above-mentioned drawbacks and to provide a relatively simple device that applies pulse technology and is capable of measuring hysteresis characteristics as accurately as possible.

[Means for Solving the Problems] FIG. 1 is a diagram showing the basic configuration of the present invention. In FIG. 1, ▪ indicates a circuit having hysteresis characteristics, 2 an applied signal generator, 3 a pulse oscillator, 4 an up/down counter, 5 a discrimination device, and 6 a counter operation control path.

In an apparatus for measuring hysteresis characteristics of a circuit 1 having hysteresis characteristics, the present invention has the following configuration. That is, the application signal generation 232 by the pulse oscillator 3 and the up/down counter 4, and the discrimination device 5 for the output signal of the circuit l described in mj.
The operation of the up/down counter 4 is controlled by the output of the discrimination device 5.

[Function] When the output of the pulse oscillator 3 in the signal oscillator 2 applied to the electric/magnetic circuit 1 is counted up by the amplifier down counter 4, for example, the state is changed to D/8 as necessary. and apply it to the TL air/magnetic circuit l. The change step of the applied voltage can be made small by the configuration of the pulse oscillator 3 and the up/down counter 4.

The output signal discriminator ``f15'' determines that the applied voltage has risen sharply by one step.The output of the discriminator 5 is given to the up/down counter 4 through a path 6, and performs the counter operation. This applied voltage is one voltage of the hysteresis characteristic.Next, using this value or a higher voltage as the starting value, the counter 4 is made to count down with respect to the output of the pulse oscillator 3, and the output is used for one step and one step. Then, the determination device 5 determines whether the output has suddenly decreased.The applied voltage at that time is the other voltage of the hysteresis characteristic.

[Example code] FIG. 2 is a diagram showing the configuration of an embodiment of the present invention.

In FIG. 2, 7 is an instruction signal terminal for the amplifier down counter 4 to turn 1-up/down, and 8 is a D
/A change (good product, 9 is the switch for inverter 10,
11 is a delay circuit, 12 is a voltage readout control circuit, 13 is a data readout timing instruction signal terminal, 14 is a reference voltage for the discrimination device, and 15 is a buffer amplifier. Other same reference numerals as in FIG. 1 indicate similar parts. Karan]...
When an up/down instruction signal is applied to terminal 7, for example to indicate an amplifier count, switch 9 is closed and bypasses inverter 10. Pulses from the pulse oscillator 3 are applied to a counter 4 and counted up. Every time the count value changes by 1, the output of the D/A converter increases little by little. It is applied to the electric/magnetic circuit 1 via an amplifier 15.

The output of the electric/magnetic circuit 1 is given to a discriminator 5 and compared with a reference voltage 14. When the output suddenly rises above the reference voltage 14, the signal is passed through the switch 9 as an operation stop signal to the counter 4. The counting operation of the counter 4 is stopped, and the control circuit 12 reads out the instruction value of the counter 4 by the data succession timing instruction signal terminal 13.

One voltage of the hysteresis characteristic of the electric/magnetic circuit l can be read out. Since the operation of the D/A converter 8 may have a noticeable delay time when the counter 4 operates at high speed, the delay circuit 11 can delay the timing at which the D/A converter 8 operates.

Next, the counter 4 is converted to count down by the signal from the instruction terminal 7, and after opening the switch 8, the counter 4 counts down the pulses from the pulse oscillator 3. D/A converter 8, amplifier 15 and discrimination value W
The operation of No. 5 is the same as described above. However, since the output from the discrimination 'A position 5 has the opposite polarity to the above, the inverter 10
is inverted and used as an operation stop signal for the counter 4.

In response to the data read timing instruction signal, the control circuit 12 reads the 1- value of the counter 4 and sets it as the other voltage of the hysteresis characteristic.

[Effects of the Invention] As described above, according to the present invention, the hysteresis characteristic can be measured with high accuracy based on the accuracy based on the settings of the pulse oscillator and the up/down counter. Highly accurate measurements can be made with a relatively simpler configuration than conventional ones. Furthermore, when measuring with the same accuracy as the conventional method, it can be constructed at an extremely low cost.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the basic configuration of the present invention, FIG. 2 is a diagram showing the configuration of an embodiment of the present invention, and FIG. 3 is a diagram for explaining the hysteresis characteristics of the electrical/response circuit. ■-Circuit with hysteresis characteristics 2-Apply signal generation 2g 3-Pulse oscillator up/down counter discriminator counter operation control path

Claims (1)

[Claims] An apparatus for measuring hysteresis characteristics of a circuit (1) having hysteresis characteristics, comprising: an applied signal generator (2) comprising a pulse oscillator (3) and an up/down counter (4); 1.) A hysteresis measuring device comprising: a discriminating device (5) for the output signal of the discriminating device (5), and the operation of the up/down counter (4) is controlled by the output of the discriminating device (5).