SU1674000A1 - Method and device for testing pulses with plane top - Google Patents

Abstract

The invention relates to electrical measuring technology and can be used to control a useful signal and interference pulses with a flattened tip superimposed on both a constant and a variable input useful signal. In order to extend the functionality by providing control of the level of a complex signal containing a low-frequency component and impulses-bursts and impulses-decays superimposed on it, the method additionally compares the resulting signal with a second reference level equal in magnitude to the first, but opposite in sign, and measure the value of the input signal at the moments of transition of the resulting signal from a level exceeding the modulus of the second reference level to a level lower than the reference one. In the device that implements the method, the useful signal with interference enters the analog-to-digital converter (ADC) 11, the first input of the adder 3 and through the inverter 1 and the delay line 2 to the second input of the adder 3, from the output of which the resulting signal goes to the comparators 4 and 5 , the second inputs of which receive reference signals from sources 6 and 7 of the reference voltage. The signals from the outputs of comparators 4 and 5 through the element OR 8 trigger a trigger 9, which triggers the A / D converter 11 and through the element 10 delay is set to its initial state. 2 sec. f-ly, 2 ill.

Description

(21) 4625621/21 (22) 12.26.88 (46) 08.30.91. Bul №32

(71) Lviv Polytechnic Institute. Lenin Komsomol

(72) About. M. Doronin, G. N Lavrov and V. M. Vanko

(53) 621.317.7 (088.8)

(56) USSR Author's Certificate N 1291887, cl. G 01 R 19/04, 1985

USSR Author's Certificate No. 1170363, cl. G 01 R 19/04,1981. (54) METHOD FOR CONTROLLING PULSES WITH A SUPPOSED TOP AND A DEVICE FOR ITS IMPLEMENTATION

(57) The invention relates to electrical measuring equipment and can be used to control a useful signal and flat-top interference pulses superimposed on both a constant and a variable input useful signal. In order to extend the functionality by providing control of the level of a complex signal containing

the low-frequency component and impulses-bursts and impulses-decays superimposed on it, in the method additionally compare the resulting signal with the second reference level equal in magnitude to the first, but opposite in sign, and measure the value of the input signal at the moments of transition of the resulting signal from the level, exceeds the modulus of the second reference level to a level lower than the reference. In the device that implements the method, the useful signal with interference enters the analog-to-digital converter (ADC) 11, the first input of the adder 3 and through the inverter 1 and the delay line 2 to the second input of the adder 3, from the output of which the resulting signal goes to the comparators 4 and 5. The second inputs of which receive reference signals from sources 6 and 7 of the reference voltage. The signals from the outputs of comparators 4 and 5 through the element OR 8 trigger the trigger 9, which starts the ADC 11 and through the element 10 of the delay is set to the initial state 2 with a pf-ly, 2 silt

WITH

The invention relates to electrical measuring equipment and can be used to control a complex useful signal consisting of interference pulses with a flattened tip superimposed on both the constant and variable components of the signal.

The aim of the invention is to extend the functionality by providing control of the level of a complex cm - wave containing a low frequency component and impulses-bursts and impulses-downs superimposed on it.

The method of controlling flat-topped pulses consists in inverting the input signal and its delay in time, summing up with the original signal, comparing the resulting signal with equal and positive and negative levels equal to the modulus with determining the times of transitions of this signal from the level exceeding the moduli reference, to a level smaller in magnitude of the reference, and measuring at these points in time the value of the input signal.

FIG. 1 shows a diagram of an apparatus for carrying out a method for monitoring pulses with a flattened tip; in fig. 2 time diagrams of his work.

The device contains an inverter 1, a delay line 2, an adder 3, comparators 4, 5, sources b, 7 of the reference voltage, an IL-8 element, trigger 9, a delay element 10 and an analog-to-digital converter 11. The first input of the adder 3 is connected to the input 12, the input of the analog-digital converter 11 and the input of the inverter 1, the output of which is connected via the delay line 2 to the second input of the adder 3 The first inputs of the comparators 4 and 5 are connected to the output of the adder 3. the second inputs of the comparators 4 and 5 are connected to the outputs of the sources 6 and 7 reference stress, and Comparator 4 and 5 outputs through two inputs of the OR element 8 are connected to the installation input to the unit of the trigger 9. The trigger output 9 is connected to the control input of the analog-digital converter 11 and through the delay element 10 to the input of the zero-setting of the trigger 9. Output 13 of the analog-digital the converter is the output of the device.

The device works as follows.

The input sum signal U (t) (useful plus interference) is inverted by inverter 1 (Fig. 2a), then delayed by line 2 of the delay at time t (Fig. 26):

T; Ј Gpl to Goz,

where tplv minimum possible duration of the flat tip of the pulse.

Tze is the total response time of the blocks 2.4 (5), 8. 9, 11, after which it is added by the adder 3 to the original signal.

In real systems, the rate of change in the level of the useful signal by modulus is limited above by some value Do / t, where Uo is the reference voltage, and the rate of change in modulus of the level of the interference noise on the front is always above this value. At the same time, when the only useful signal arrives at the device input, the voltage level at the output of the adder 3 does not exceed the value of Do. When a noise pulse appears with a flattened top along its front and rear edges, different polarity voltage jumps are formed (Fig. 2c), exceeding in absolute value the level Uo, which is exceeded beyond the limits when the impulse of its flattened top is reached and terminated. Therefore, the signal Uc (t) from the output of the adder 3 is compared by comparators 4 and 5, respectively, with the reference voltages U0 and -U0 from the outputs, respectively, of the sources b and 7. When the conditions

Us (t) U0, U W -Uo (2)

0, at the outputs, respectively, of the comparators 4 and 5, pulses are formed (Fig. 2d, d, e), alternately controlling their rear fronts by setting trigger 9 in a single state (Fig. 2g). When the latter is set to 1, analog-to-digital converter 11 operates, converting the current level U (t) into a digital code. Some time after the trigger 9 is set to 1, it is determined by the delay element 10

0 and no less than the maximum response time of the converter 11, this trigger is set to zero, indicating the presence of a digital level code at the output of the ADC

Claims (2)

01. A method of controlling flat-topped pulses, which consists of inverting the input signal, time delay and summing up with the original signal, comparing the resulting signal with the first reference level and measuring the moment of transition of this signal from the level exceeding the first reference in magnitude, smaller in module reference level, characterized in that 0 in order to extend the functionality by providing control of the level of a complex signal containing a low frequency component and impulses-bursts and impulses 5 decays superimposed on it. Comparison the resulting signal with a second reference level equal in magnitude to the first but opposite in sign measure the values of the input signal at the time of the transition of the resulting signal from a level higher than the modulus of the second reference level to a level lower than the reference one, and the module of the reference levels is determined between the boundaries of the fast ™ change along the front of a pulse of interference 5 and the rate of change of the useful signal. 2. A flat-tip pulse control device containing an adder, the first input of which is the input of the device and through the inverter and the delay line is connected to its second input, which is related to that. in order to extend the functionality by providing control of the level of a complex signal containing a low-frequency component and impulses-bursts and impulses-decays superimposed on it, increasing the accuracy of control, two comparators are entered into it, the first inputs of which are connected to the output of the adder, the first input of which connected to analog-digital input t P 0 A transducer whose output is the output of the device, and the control input is connected to the trigger output and the input of the delay element, the output of which is connected to the installation input to the O flip-flop, the installation input to 1 which is connected to the output of the OR element, two inputs to which are connected to the corresponding outputs comparators, the second inputs of which are connected to the outputs of the sources of the reference voltage, respectively. AT 5, one/