SU785797A1 - Device for measuring time parameters of pulse code signals - Google Patents

Description

(54) DEVICE FOR MEASURING TIME PARAMETERS OF PULSE CODE The invention relates to electrical measuring equipment and can be used when checking the parameters of automation devices, telemechanics and signaling railway transport. A device for measuring the temporal parameters of the pulse signals, the receiving coils, the sensors of the beginning and the end of the pulse, the circuit of fixing the beginning of the first half-wave of the variable filling signal, the key, the counting pulse generator, and the pulse counter Cl are known. However, this device does not provide the ability to measure time intervals between pulses. The closest to the invention is a device for measuring the temporal parameters of pulsed code signals, comprising an AC pulse block, an edge pulse shaping and decay unit for the signal under test, a block for fixing the longest time interval between the pulses of the signal under investigation, a pulse distributor, a trigger cycle switch , time interval generator, control unit, SIGNALS pulse shaping unit with reference tracking frequencies and digital Indication L L The purpose of the invention is to enhance the functionality. A device for measuring the temporal parameters of pulse code signals, containing an AC pulse envelope selection unit, the input of which is connected to the first input of the device, and the output - to the input of the forcing unit of fronts and decays of the tested signal and the input of the fixing unit of the longest time interval between the pulses of the signal under investigation , pulse distributor, the first output of which is connected to the cycle trigger input, and the second outputs - to the first inputs of the switch, the second input of which is connected with the trigger trigger output, the third, fourth, and fifth inputs with the outputs of the time switch for the time intervals, the fixing unit of the longest time interval between the pulses of the signal under investigation and the first output of the pulse shaping unit with reference tracking frequencies, the output with the first input of the control unit, the second input whom

connected to the second output of the pulse shaping unit with reference / following frequencies, and outputs to the inputs of the display unit, and the input of the time interval generator is connected to the second input of the device equipped with two lock elements, a coincidence unit and a synchronization trigger, the counting input of which is connected to the output of the fixing unit the longest interval between the pulses of the signal under study, the input of the setting to O to the output of the second delay element, and the output to the first input of the coincidence unit, the output to torogo coupled to inputs of the second delay element and the input of the installation in the ON pulse distributor, a first input connected to the output of the first delay element having an input connected to the output of the pulse forming unit fryuntov and downs of the test signal and a second input of the coincidence unit.

The drawing shows the structural electrical circuit of the device.

The device consists of a block 1 of the extraction of the envelope of alternating current pulses, a block 2 of formation of the pulses of the fronts and decays of the investigated signal, the first delay element 3, the pulse distributor 4, the switch 5, the control unit 6, the block 7 of fixing the longest time interval between the pulses of the signal being investigated, a trigger synchronization 8, a coincidence block 9, a cycle trigger 10, a second delay element 11, a time interval generator 12, a pulse shaping unit 13 with reference tracking frequencies and a block, and dikatsii 14.

The device works as follows.

The alternating current pulses of the code signal under study are fed to the input of the envelope unit 1 of the alternating current pulse envelope. The output pulses of block 1 are fed to the input of block 2 of forming the pulses of the edges and decays of the signal under study and the input of block 7 fixing the longest time interval between the pulses of the signal under study. In block 7, the duration of the time intervals between the pulses of the signal is converted into a constant voltage, the comparison of this voltage with the reference voltage, which is set corresponding to the longest time interval, and the formation of a pulse at the moment of equality of the voltages. The output signal of block 7, which occurs at the end of the longest time interval, is fed to the counting input of synchronization trigger 8 and sets it to state 1. The output signal of synchronization trigger 8 is fed to the first input of block 9 matches, to the second input of which the output signal of block 2 the formation of pulses of fronts and decays of the signal under study. When a match 9 arrives at the input of a block 2 of a pulse following the longest interval, a signal appears at the output of the coincidence block 9, which is fed to the input of the installation in O of the pulse distributor 4. The same signal through the second delay element 11 is fed to the installation input in About the trigger synchronization 8. The output signal of the unit 2 of the formation of the pulses of the fronts and decays of the signal under study is fed through the first delay element 3 to the counting input of the impulse distributor 4 after installing the latter in O. Counts pulse distributor 4 generates code corresponding to the sum of the numbers of pulses and intervals of the code signal. At each output of the decoder (output of the pulse distributor 4), a pulse arises, the duration of which is equal to the duration of one of the pulses or intervals of the code signal. Using the switch 5, one of the outputs of the pulse distributor 4 is connected to the first input of the control unit 6, to the second block of which the pulses of the reference frequency are output from the output of the block 13. The control unit 6 sets the counter of the display unit 14 to O, sends to its counting input the pulses of the reference frequency during the duration of the measured element of the code signal, generates a pulse recording the measurement result in the register of the display unit 14. After decoding, the measurement result is displayed.

When measuring the time characteristics of the relay, the signal under study is fed to the second input of the device, connected to the input of the time interval shaper 12. From the shaper 12 output, pulses with a duration equal to the measured time intervals are fed to the third input of the switch 5. The output signals of the longest fixing unit 7 the time interval between the pulses of the signal under study and the unit 13 for the formation of pulses of the reference frequencies is fed to the fourth and fifth inputs of the switch 5, which allows you to control bot of these blocks.

The invention allows to improve the quality of repair and adjustment of railway automation and alarm devices.

Claims (2)

Invention Formula A device for measuring the temporal parameters of pulse code signals, containing a block for the alternating current pulse envelope, whose input is connected to the first input of the device, and the output to the input of the pulse shaping unit of the edges and drops of the signal under study and the input block of the longest time interval between the pulses of the signal under study , pulse distributor, the first output of which is connected to the cycle trigger input, and the second outputs - to the first inputs of the switch, the second input of which is connected with the trigger trigger output, the third, fourth and fifth inputs — with the time interval generator outputs, the latching block of the longest time interval between the pulses of the signal under investigation and the first output of the pulse shaping unit with reference follow frequencies, and the output with the first input of the control unit, the second input of which is connected to the second output of the pulse shaping unit with the reference following frequencies, and the outputs - to the inputs of the display unit, and the input of the time interval generator is connected to To the device's input, in order to expand its functionality, it is equipped with two delay elements, a coincidence unit and a synchronization trigger, the counting input of which is connected to the output of the fixing unit of the longest time interval between pulses of the signal under study, the installation input to O to the output of the second delay element, and the output to the first input of the coincidence unit, the output of which is connected to the input of the second delay element and the installation input to O of the pulse distributor, the house is connected to the output of the first delay element, whose input is connected to the output of the pulse shaping unit of the edges and decays of the signal under study and the second input of the coincidence unit. 0 Sources of information taken into account in the examination 1, USSR Author's Certificate No. 561152, cl. G 01 R 29/02, 1974. 2. Automation, remote control and ;. 5 communication - journal № 3, 1977, p. 12-15 (prototype).