SU1160600A1 - Device for testing electromagnetic switching elements - Google Patents

Description

The invention relates to radio engineering and can be used in testing switching equipment.

The purpose of the invention is to increase the reliability of the test results.

FIG. 1 shows the block diagram of the device; in fig. 2 - block diagram of the measuring unit; in fig. 3 - time diagrams of work.

A device for testing electromagnetic switching elements contains a master oscillator 1, a divider 2 frequencies, the first key element 3, the first-flip-flop 4, the second ϋ-flip-flop 5, the measuring unit 6, the driver 7 signals, load resistors 8, switch 9, the generator 10 pulses current and voltage, the driver 11 of the registration interval 11, the second key element 12 and the test contacts 13.

The measuring unit 6 contains the first and second elements And 14 and 15, the control circuit, each of which contains the threshold unit 16, the outputs of which are connected to the test contacts 13, the element And 17, the amplifier 18, the counter 19, in addition, the measuring unit 6 contains the element OR 20.

The device works as follows.

The master oscillator 1 generates a pulse signal, which through the second key element 12 is fed to a multi-stage trigger divider frequency 2. At the outputs of the divider frequency 2, four signals are formed with a frequency ratio of 12-4-8 (Fig. 3 a, b, c, d). These signals arrive at the inputs of the ϋ-flip-flop 4 and г-flip-flop 5. From the direct output of the ϋ-flip-flop 5, pulses are fed through the shaper 7 to the windings of the tested elements (Fig. 3 D). In this case, the test contacts 13 are triggered. From the output of the frequency divider 2, a signal (Fig. 3c) is sent to the control input of the key element 3, which through the switch 9 connects the test contacts 13 and the load resistors 8 to the generator 10. This provides a current-free mode. Via

switch 9, you can connect the test contacts 13 and the load resistors 8 directly to the generator 10. In this case, the test contacts 13 will operate in the current switching mode. The signals from the test contacts 13 (Fig. ZE) are fed into the measuring unit 6 to the threshold block 16 of the control circuit and opening control. Each threshold unit 16 is triggered when the voltage at the corresponding test pin 13 exceeds the set threshold (short circuit criterion). Each threshold opening control unit 16 is triggered when the voltage at the corresponding test pin 13 is below the threshold level (opening criterion).

The outputs of the три-flip-flops 4 and 5, as well as the output of the divider 2 frequency are connected to the inputs of the elements And 14 And 15 in the measuring unit 6. At the output of the element And 14 a signal is generated to enable the control of the circuit (Fig. 3 g), and at the output of the element 15 a release control enable signal (Fig. 3 h).

These signals are received respectively on the elements And 17 chains of control. During normal operation, the tested contacts 13 at the outputs of the elements And 17 of the first and third control circuit signals are absent. When a contact fails at the output of the corresponding element, a pulse appears (Fig. 3 and, k), which, passing through the amplifiers 18, triggers the corresponding counter 19 to trigger. In addition, when a test 13 fails, a pulse is generated at the output of the element OR 20. This pulse includes the imaging unit 11. In this case, the output signal of the imaging unit AND the recording interval locks the second key element 12 (Fig. 3 l) for a time determined by the parameters of the imaging unit 11 of the recording interval. The operation of the entire device is suspended for this period, after which the normal operation of the device continues until the next failure occurs.

1160600

FIG. /

FIG. 2

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Failure

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Failure

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Claims (1)

A DEVICE FOR TESTING ELECTROMAGNETIC SWITCHING ELEMENTS, containing a master oscillator, current and voltage pulse generator, measuring unit, driver of signals, frequency divider, switch, first key element, first and second C-flip-flops and load resistors, the first terminals of which are interconnected and through switch with the first output of the first key element, the second output of which is connected to the generator of current and voltage pulses, the first output of the frequency divider is connected to the input of the first key The first element and the first inputs of the measuring unit, the second output of the divider, the frequency is connected to the first and second C-flip-flops, the direct outputs of which are connected to the second inputs of the measuring unit, the inverse output of the first C-flip-flop is connected to the third input of the measuring unit and the input of the signal conditioner, And the inputs of the first and second C-flip-flops are connected respectively to the third and fourth outputs of the frequency divider, the second terminals of the load resistors are connected to the fourth inputs of the measuring unit, which through Test contacts are connected to a generator of current and voltage pulses, characterized in that, in order to increase the reliability of the test results, a sequentially connected recording interval generator, the input of which is connected to the output of the measuring unit, is entered into it, the second key element whose second input is connected to the output master oscillator, and the output is connected to the input of the frequency divider, and the measuring unit is made in the form of the first and second elements AND, the element OR.and four control circuits, each of which x contains series-connected threshold block, element I, amplifier and counter, output of the first element AND connected to the second inputs of elements AND of the first and third control circuit, output of the second element AND under: keys to the second inputs of elements AND the second and fourth control circuit, output of the element And each control circuit is connected to the corresponding input of the OR element, the output of which is the output of the measuring unit, the first inputs of the first and second elements are And are connected and are the second input of the measuring unit, the second inputs of the first and the second elements And are connected and are the first input of the measuring unit, the third inputs of the first and second elements And are respectively the third and second inputs of the measuring unit, the inputs of the threshold units are combined in pairs, connected to the terminals of the corresponding load resistors and are the fourth inputs of the measuring unit. 1160600 > 1160600 one