SU566232A1 - Apparatus for measuring the rattle time of electric contacts - Google Patents

Description

1 (.ch1ggera and in) scrap formulated survey and demand, U naj D () a; 3ubie counter outputs 1 are connected to the inputs of the xhvmm release of the measured conditions of the counter.

In the drawing, a structural circuit is attached to the device for measuring electric bounce, contacts.

The device consists of a former. 1 start, exit connected with trigger 2; the output of the latter and the output of the generator 3 pulses are connected to the inputs of the circuit 4 at the beginning of the countdown, the output of the trigger 2 directly and the output of the generator 3 pulses, through: delay line 5 is connected to the corresponding bursts of the bounce circuit 6, the third input which is combined with the input shaper 1 run.

The outputs of the bounce circuit 6 and the coincidence circuit 4 at the beginning of the countdown are connected respectively to the inputs of the circuit 7 of the instantaneous states of the counter and 8 by i mod-ION. Moreover, the latter is the output of the middle: en with v.hods (and vice versa) of the circuit 9 for specifying the measurement time. The other output of counter 8 is modulated by ION through the selection circuit 10 of the initial state of the counter and the driver 11 for polling and resetting the connections; is connected to the corresponding inputs of trigger 2, circuit 12 of the register state and digital printing device 13. The outputs of the counter 8 are through the allocations 7 The instantaneous counter states are connected to the inputs of the register 14, and the outputs of the latter through the register allocation circuit 12 to the outputs of the digital printing device 1.3.

The device works as follows ..

The contact to be tested (not shown) is connected to the earth terminal and the input of the device. The device turns on the power and presses the setup button (not shown in the drawing), at the signal of which the trigger 2 and the counter 8 mod 10 K are set to the zero state.

At the closure of the contact being checked, at the moment of the first, when the contacts touch, the input voltage of the start driver 1 is reduced to zero and a signal is generated which sets trigger 2 to one state. In this case, the passage of pulses from the generator of 3 pulses to the input of the counter 8 mod Ю N is allowed, which changes its state with each incoming pulse.

At the inputs of the schema of osadaptions, with rattle, the resolving potential comes in

Trigger 2, delayed} on the 5 Dorzhka line, impulses with gue.at.) and 3 pulses and single signals1 and 1 in mamaps) 0 falling of the contact in the test (bounce).

The frequency and duration of the pulses at the output of the generator 3 are chosen from the conditions for obtaining the required accuracy of measuring time, bounce and depending on the duration of the period of natural oscillations of the contacts being tested.

The presence of the delay line 5 is caused by the need for time separation of the moments of signal input to counter 8 by trtod 10 N and the reading of the instantaneous states of the same counter.

Counter 8 with each: j ,. The incoming pulse measures its state per unit, and when a signal arrives at the moment of contact loss (bounce) from the output of circuit 6, a resolution is given to circuit 7 of instantaneous counter state selections to read the instantaneous code of counter 8 in ION mod and store it in register 14. To eliminate the preset: setting the register to the Eiy state, the code is transmitted paraphase. Since a repeated contact breakdown occurs during a single switching of the check contact (during the bounce time), the code stored in register 14 will change during the measurement time and upon termination of the bounce, the final result, which represents the contact bounce time, is remembered.

The volume of the counter is 8 modulo ION krten Yu, and the multiplicity is set by s.mema 9 of the measurement time for checking different types of contacts (differing with bounce times).

When the meter 8 is fully filled according to the ION mod, it is set to its initial state, and the U you circuit. division: the initial state of the count. By means of the polling and resetting unit 11, a signal is input to the register allocation circuit 12 for reading. The code stored therein (chatter time) on the digital printing device 13 for printing this is read from the register 14 of the code and on the trigger 2 for setting it to the initial state.

Claims (2)

1. Author's certificate number 377736, cl. Q 04 T 10/06, 1971. 2. The patent of France jNb 21445О44, cl. G 01 m 19/00, publ. 1973. Bkod sh It X5 12 W 3