SU1167539A2 - Device for measuring pulse edge time - Google Patents

Abstract

DEVICE FOR MEASURING THE DURATION OF IMPULSE FRONTS FOR AUTH. St. 9 1071974, distinguished by the fact that, in order to expand its functionality, the second and third elements AND, the inverter, the third SHS element are introduced into it, and the input of the second element AND serves as the input for measuring the pulse duration, the second input of which is connected to the input of the inverter and serves as a resolution input, the output of which is connected to the third element I, the second input of which is connected to the output of the first element AND, to the inputs of which the outputs of the flip-flops are connected, and the output of the third element AND connected to the input of the third element OR, t The input of which is connected to the output of the second element AND, and the output of the third element OR is connected with the input of the pulse shaper, with the second inputs of each element AND (L group of elements and with the installation inputs of the triggers.

Description

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00 QD 11 The invention relates to electrical measuring equipment, can be used in the development of digital pulse parameters meters, and is an improvement of the device according to the authors. St. No. 1071974. According to the main author. St. No. 1071974, a device is known for measuring the duration of pulse fronts, which contains two adjusted resistors connected between the supply voltage bus and the control inputs of the triggers, AND element, pulse driver, two OR elements, group of AND elements, pulse counter, diode encoder, indicator and lines of delay with the withdrawals of Cl}. The disadvantage of this device is the impossibility of measuring for the efficiency of rectangular pulses. The aim of the invention is to expand the functionality of the device. FIG. .1 is a block diagram of the device; in fig. 2 timing diagrams explaining the operation of the device; in fig. 3 connection circuit of device inputs The device contains triggers 1, trimming resistors 2, elements AND 3, 4, 5, elements OR 6, 7, 8, impulse driver 9, groups of elements AND, delay line 11, counter 12, diode coder 13, indicator 14, inverter 15. The device operates as follows. The variable pulse is fed to the input pulse width measurement, while the resolution input receives a logic level 1 that permits the passage of a measuring pulse of duration D (Fig. 2i) through the AND 4 element to the input of the OR element 6. From the output of the SHSh 6 element, this pulse arrives at the input of the pulse body 9, which separates the short pulse t, combined with the beginning of the pulse f and satisfying the condition. A short pulse t (Fig. 2rt goes to the input of the element OR 7 and from the output, to the input of the delay line 11 (Fig. 2c)), then occurs at each of its outputs. the input of each element of the group of 10 elements (Fig. 2 9 to the second inputs of which impulse f arrives, while w 1 pulses tj .. pass through those elements of group 10 of the elements AND for which condition n is fulfilled, where n is the number of withdrawal of line 1 delay, and .IT is the quantization step of delay line 11. These pulses go to the inputs of the element OR 8, and from its output to the the counter input 12. From the output of the counter 12, the pulse width information or the pulse edge duration is sent in parallel code to the input of the encoder 13, and then displayed on the indicator 14. If the pulse width IT exceeds the delay time provided by the P line, the pulse and, from the output of the delay line, the second input of the element OR of the element OR 7 and the pulse width measurement process continues. At the moment of termination of the pulse t (in its slice), the triggers 1 are reset. When measuring the duration of the pulse front, the level of logic O is applied to the resolution input, and the measured pulse is fed to the trigger inputs. 1. At the output of element 3, an impulse t appears, the duration of which is equal to the length of the front. This pulse arrives at the input of element 5, the other input of which receives the level of logic G from the output of inverter 15, allowing the passage of a pulse to the input of element 6. Next, the process of measuring the front duration t does not differ from measuring the pulse duration C. measurements of the duration of the front did not turn out to be connected, it is necessary to use a connection circuit (Fig. 3) with emitter followers 16. The functionality of the device has been expanded, since it is possible to measure the duration NTG pulse and a pulse width. Measured durations are not limited by the delay time of the delay line 11. The device can be made entirely on digital elements without the use of analog technology, which reduces the cost of its adjustment, increases its reliability and allows to automate its production.

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Claims (1)

DEVICE FOR MEASURING DURATION OF FRONTS OF PULSES by ed. St. No. 1071974, distinguished by the fact that, in order to expand the functionality, the second and third elements AND, the inverter, the third element OR are introduced into it, and the input of the second element AND serves as an input for measuring the pulse duration, the second input of which is connected to the input the inverter also serves as a permission input, the output of which is connected to the third AND element, the second input of which is connected to the output of the first AND element, the outputs of the triggers are connected to its inputs, and the output of the third AND element is connected to the input of the third OR element, the second the course of which is connected to the output of the second AND element, and the output of the third OR element is connected to the / input of the pulse shaper, with the second inputs of each element AND of the group of elements and with the installation inputs of the triggers. SU ... 1167539 1 1167539 2