SU815789A2 - Device for measuring operation characteristics of magnetically-operated contacts - Google Patents

Description

one

The invention relates to a measurement technique and can be used in the electronics industry for automatically measuring the magnetizing force of a response, the magnetizing release force (n. Of operation, n. Of release), the return factor Kg, and also for sorting the contacts according to the specified parameters at the factory manufacturer and at the input control at the consumer.

According to the main author. St. No. 417854, a device for measuring the response characteristics of magnetically controlled contacts, which can be used in the electronics industry for automatic measurement n. with. triggered, n. with. release, the difference between n. with. triggered and n. with. release, return coefficient Kg, as well as for sorting the contacts according to the specified parameters at the factory and at the incoming control of the consumer. This device contains a generator of falling and rising currents, a measuring device and a control circuit consisting of a switch, two triggers and a logic element. The device is equipped with a reversible counter, a coincidence circuit, and a control voltage divider. The input of the reversible counter is connected to the specified generator, and the output through the control voltage divider is connected to a measuring device connected in parallel to the control winding of the magnetically controlled contact connected to the output of the reversible counter and trigger of the fault reject indication, and through the logical element HE with the other output of the reversible counter and the trigger for the release rejection indication. The other inputs of the triggers are connected to the output of the coincidence circuit, the input of which is connected to the reversible counter.

A disadvantage of the known is that, in order to determine the contact return coefficient, the difference between n is measured. with. triggered and n. with. release, is equal to the amplitude value of the triangular voltage measured by the device and applied to the control winding when the generator is operating in continuous mode. Difference between n. with. triggered and n. with. the release is not a passport parameter of magnetically controlled contacts and its measurement is not necessary when developing contacts. And the use of this parameter to determine the return coefficient of the contact Kg, which is the passport parameter, leads to the need to perform computational operations using the measured parameters. This complicates the use of the device and increases the time it takes to sort out contact data by return coefficient. It is known that the return coefficient K of a magnetically controlled contact is determined by the ratio vidar.

Kg fo-m. ,, ° Qcpcif

gdeQomr n. C. release of contact;

QcpoS - n. with. triggered.

This ratio can be written as

If Uotrin,

A. l, oCQcpqtT,

where o (-division coefficient, au

If the value is d. set so that cp5 (or otQofnn) is equal to a constant, before the given value C, then the value of the return coefficient Kg will be proportional to the value, n. with. release (inversely proportional to the value. p. of operation), i.e. the deviation of the meter arrow, corresponding to. () will be directly (or inversely) proportional to the value of the coefficient of return Kg, which is obvious. Tact; Thus, for direct measurement of Kg, it is necessary to dry out the factor d dye (manually, tipi- .ic), using a potentiometer, or automatically, using the next system), and provide the meter with an additional scale calibrated in numerical values return rate Kg.

The aim of the invention is to reduce the time spent on determining the return ratio of the magnetically controlled contacts.

This goal is achieved by the fact that the device for measuring the response characteristics of the magnetically controlled contacts contains a controllable voltage divider connected in parallel to the control winding, and a measuring device is connected to its output.

This device provides a count of the value of the contact return coefficient directly on the scale of the measuring device, without the use of operating devices.

FIG. 1 shows a block diagram of the proposed device; in fig. 2 - principle electric circuit of the controlled voltage divider with automatic setting of the division factor; in fig. 3 principle electrical circuit controlled voltage divider with manual setting of the division factor.

A device for measuring the response characteristics of the magnetically controlled contacts (Fig. 1) consists of a generator 1 connected to a reversible counter 2 connected to a control divider 3, the output of which is connected to the control winding 4 of pin 5 connected to one of

reversing counter 2 and trigger reject indication 6, and with another counter reverser 2 and trigger 7 reject rejection indications contact 5 is connected via a NOT 8 circuit. In parallel to the control winding 4, a voltage divider 9 is connected to which the measuring device 10 is connected The S.Chem 11 coincidence of the svopm input is connected to the reversible counter 2, and the outputs - to the inputs of the flip-flops 6 and 7. The generator 1 is connected to the peers of the counter 2 through the switch 12.

A controlled voltage divider with an automatic setting of the division factor (Fig. 2) is a decisive amplifier 13 with an input resistance 14, in the feedback circuit of which a unipolar transistor 15 is connected, which plays the role of controlled conductivity. To the output of the amplifier 13 is connected to the measuring device 10 and amplitude

5 detector assembled on diode 16, capacitor 17 and discharge resistance 18. Comparator 19 is connected to the cathode of diode 16 of the amplitude detector with one input and to the slider of the potentiometer 20 with its other input. Comparator 19 output

0 is connected to the gate of the transistor 15.

FIG. Figure 3 shows a controlled voltage divider with a manual division of the division factor, which is a decisive amplifier 13 with an input resistance 14, in the feedback circuit of which a variable resistor 21 is connected, by changing the position of the slider which can be set to the desired division factor.

The device for measuring the response characteristics of the magnetically controlled cycles operates as follows.

The control divider 3 feeds from the moment of opening of the measured contact 5 stepwise increasing current to the control winding 4. In the contact circuit of the contact 5 of 5, the trigger 6 is reset to the initial state and the reverse of the counter 2 changes. A 4-second control divider 3 is fed in a stepwise decreasing current until the measured contact 5 opens, resetting the trigger 7 of the rejection fault indication and changing the reverse of the counter 2 to the opposite state, etc. Diagram 11 match up with reversible

5 counter 2 and inputs of triggers b and 7 so that at the time of exit n. triggers and ns release beyond tolerance triggers 6 and 7 are transferred to the state of "marriage. Depending on the two positions of the switch 12, the generator 1 is turned on at the moment of opening (switch position b) or contact closing (position a). When this is done, counter 2 is stopped, and the value 10 is fixed on the device 10, which is in the "measuring NS" mode. with. release or ns triggered. In the third position (position c), the generator 1 is disconnected from the reverse of the counter 2 and operates in continuous mode, while the control winding 4 and the input voltage of the controlled voltage divider are supplied with a triangular voltage. The controlled voltage divider 9 divides the input voltage so that the voltage corresponding to n. with. The response (or ns release) was a predetermined predetermined value. In the case of using a controlled divider, 9 with automatic setting of the division factor (Fig. 2), the excitation voltage of the control winding is supplied through the input resistance 14 to the deciding amplifier 13, from the output of which goes to the measuring device 10 and the amplitude detector assembled on elements 16 -18, the output voltage of which is compared by a comparator 19 with a constant, in advance of a given value equal to o6} cpeS С,

set on the potentiometer 20. The magnitude of the error voltage at the output of the comparator 19 is applied to the gate of the unipolar transistor 15, as a result of which the output of the amplifier 13 is supported by a triangular voltage of the specified a. amplitude Umax C, which does not depend on the amplitude of the control voltage about. hank 4.

The use of the invention allows to reduce the time spent on the determination of the reed switch return ratio.

 the invention

Device for measuring the response characteristics of magnetically controlled contacts by author. St. No. 417854, characterized in that, in order to reduce the time for determining the return coefficient of the magnetically controlled contacts, it is equipped with a controllable voltage divider, which is connected in parallel to the control winding, and a measuring device is connected to its output.

Sources of information taken into account during the examination 1. USSR Author's Certificate No. 417854, cl. H 01 H 49/00, 1971.

rSl.

Fig.Z

Claims (1)

Claim A device for measuring the response characteristics of magnetic contacts on the author. St. No. 417854, characterized in that, in order to reduce the time for determining the return coefficient of the magnetically controlled contacts, it is equipped with a controlled voltage divider, which is connected in parallel to the control winding, and a measuring device is connected to its output.