SU436321A1 - DEVICE FOR MEASURING THE TIME OF VIVRACIOCONTACTS - Google Patents

Description

one

The invention relates to the measurement technology.

Famous devices for measuring the time-of-vibration of contacts, containing an electrically connected generator of the reference frequency, controlling trigger and photo: pM1I1pO | Vatel of pulses, do not have sufficient accuracy.

To improve the measurement accuracy, the proposed device is equipped with two | M counters and pulses with electronic keys, connected inputs - to the alternator of this frequency, the control input of the key of one counter is connected to the output of the other counter through a control trigger and the control input of the key of the other counter 1 and the reset input of this counter are from the output of the pulse shaper.

FIG. i presents a block diagram of the described device; 1 to FIG. 2 - time diagram work.

The device consists of reHepaTOipa 1 reference frequency, electronic key 2, counter 3 pulses with a decoder and display device (| not shown) of control trigger 4, electrode key 5, counter 6 1 pulses, driver and pulses 7 and contacts 8 of the tested relay .

The generator, p 1, is intended to form.: No pulses, the period of which is precisely known. The electronic key 2 passes in the open state, and (In the closed state, it does not transmit pulses from the output of the generator 1

That input of the counter 3 And to the input of another electronic. Its key 5. Counter 3 serves to count the pulses transmitted through the electronic key 2 - and output the information on the indicator device. The control trigger 4 is designed to generate a permitting signal on key 2. Key 5 in open.m of the state transmits pulses from the output of key 2 to the input of counter 6, which is a signal formation delay element.

to the control trigger 4. The shaper 7 serves to generate pulses of certain parameters of the nz pulses of a random sequence received at its input through the differentiating chain (not shown in the drawing) from the monitored contacts 8. The capacitance of the 3 aia.MHoro counter is larger counter capacity 6.

The device works as follows. With the reset button, the control trigger 4, the counter 3 and 6 are set to: source: Ground state. In the initial state, the key 2 is closed, and the key 5 is open. When voltage is applied to the working coil of the tested cn.crn device, for example, electromagnetic

the relay, the latter is triggered and closes the contacts 8, the input of the driver 7 through the randomizing chip "random pulses come 1 because of the jitter (vibration) of the contacts 8. The first pulse from the driver 7, the post of the control trigger 4, overturns it in a steady state the output signal of the trigger 4 opens the key 2. As a result, the generator 1 receives pulses; ia; the input of the counter 3 is the key 5. The key 5 when the output of the imager 7 emulses is closed 1аm The arrival rate of each pulse from the driver 7 "and the reset spike of the counter 6, its contents are reset to" O.

At the instant of time when the case of contact 8 contacts has occurred, and when the output of the former 7 impulses are large, the counter 6 begins to fill, which when n + 1 is received (n is the maximum number of pulses that the counter 6 can count ), iernenergs, and on its output, a pulse will appear that returns trigger 4 to its original state. In this case, the key 2 is closed, and the counter 3 stops counting. Thus, counter 3 records the number of pulses that its input entered from the moment of the start of vibration until the moment of the smoked PLUS and the number of pulses n. The time of vibration is determined by subtracting from the total number of pulses registered by the counters 3, n pulses. This happens the following way. In the initial state, the counter 3 is set first by “O, and the number is stored in it, the maximum possible number of pulses that ciH can count, mvnus number n. When the n-th pulse arrives, counter 3 overflows, i.e. . is set to “O, and the pulses that are registered after the set in“ Oh, will be equal to the time of vibration.

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where N is the number of them: puloo.v counted

€ odd | co M 3, t, | - period followed by pulses from the. 1 generator.

FIG. 2 introduced the following names:

1-traffic tok.k in the circuit of the tested contacts (the vibration. Began at point a and quiescent at point b);

II oscillogram of generator 1 pulses;

III-impulses on the inlet of the former, 7;

IV - im.pulsy on. De for) worldviewer 7;

V is the signal supplied to the electronic key 2 from trigger 4;

VI- pulses entering the counter 3 (point a is the beginning of the count, point b is setting the counter to “O, point c is the end of the count);

VII - imulses received in counter 6 (points b, c. D, e, g, I correspond to those times .MCiHTaM time: when the content of my counter was reset to "O, point / is the moment of perfect vibration, point t - the moment of the counter overflow).

PREDIMETE AND U OF THE BEST AND U

A device for the purpose of contact time vibration, containing electrical connected reference frequency generator, a control trigger and a pulse shaper, characterized in that, in order to increase the measurement accuracy, the oio is equipped with two pulse counters with electronic keys | AND, CONNECT. LINE INPUTS to the reference frequency generator, at this time the control input of the key of one counter is connected to the output of the other counter via the control trigger of the other counter and the reset input of this counter from the output scrap pulse shaper.

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