SU1739362A1 - Device for measuring time intervals - Google Patents

Abstract

The invention relates to a measuring technique and can be used in information measuring technique for measuring time intervals. The device contains a generator of 8 pulses, elements And 3, 7, a counter of 13 pulses, comparators 1.5, triggers 4.11, and inverters 6, 9.12, differentiation element 10, electronic key 2, inputs 14, 15 of the device, 2 or .

Description

cl

WITH

h from che to soyu

The invention relates to measurement technology and instrumentation and can be used in information and measurement technology for measuring time intervals.

The purpose of the invention is to expand the functionality of the device.

FIG. 1 is a diagram of an apparatus for measuring time intervals; in fig. 2 - timing diagrams explaining the principle of operation of the device.

The first input of the comparator 1 is supplied with a reference voltage, and the second input is connected to the second input of the electronic switch 2, the output of the comparator is connected to the first input of the element 3, the output of the latter is connected to the input of the trigger 4, the output of which is connected to the control input of the electronic switch 2 whose output is connected to the first input of the comparator 5, to the second input of which the reference voltage is applied, and the output is connected to the input of the inverter 6 and the second input of the And 7 element, the first input of which is connected to the output of the generator 8, and the third input is combined from the input Inverter 9 and the differentiation element 10 are connected to the output of the trigger 11, the first input of which is connected to the output of the inverter 6, the second input is connected to the output of the inverter 9, the input of the inverter 12 is connected to the output of the differentiation element 10, the output of the inverter 12 is connected to the second input of the counter 13 , the first input of which is connected to the output of the element AND 7, the input 14 of the device is connected to the second input of the comparator 1, the input 15 of the device is the second input of the element AND 3.

The device performs the determination of the duration of the informative part of the input signal (Fig. 2a). Form 1 of the depicted input signal is characteristic of signals taken from photodetectors in scanning-type optical measuring devices. The informative part of the input signal is in the interval trt2 (Fig. 2a). The duration of the measured interval tx is determined at the level specified at the second input of the comparator. The device start signal is not synchronized with the input signals and can be applied at arbitrary times relative to the input signal.

The device works as follows.

Periodically, the following input signals are fed to the input of the comparator 1 and the key 2. With the help of the comparator 1, the input signals are converted into a pulse sequence with level differences

voltage corresponding logical (figb).

In the initial state, the triggers 4 and 11 are reset. The Start signal (Fig. 2c) corresponding to logical 1 at input 15 through the element And 3 sets trigger state 4 to one state (Fig. 2d), the signal from the output of which opens key 2 and input signals arrive at the input of comparator 5. Comparator 1, the element And 3 and the trigger 4 prevent the passage of the input of the comparator 5 of the input pulse. At the output of the comparator 5, a signal is formed (Fig. 2e), the switching of the voltage level

at the output of the comparator occurs at the moment of coincidence at its inputs of the reference voltage and input pulses. The first pulse from the output of the comparator 5, inverted by the inverter b, sets the trigger 11 in one state with a leading edge (Fig. 2e). On the front of the signal from the output of the trigger 11, through the differentiation element 10 and the inverter 12, the counter 13 is zeroed and it arrives in the ready state

pulse counting reference frequency. On the front of the second pulse from the output of comparator 5 (Fig. 2e), inverted by inverter b, trigger 11 is zeroed. The signals from the output of the trigger 11 (Fig. 2e) and the comparator

5 form at the input of the element And 7 an interval tx, during which the pulses of the reference frequency pass from the output of the generator 8 through the element 7 to the counting input of the counter 13. After the interval tx ends on the counter

13, the result is fixed, while the circuit is in a state of readiness to change the interval tx in the next input pulse.

Claims (1)

Invention Formula A device for measuring time intervals, comprising the first and second inputs of the device, the reference pulse generator, the first and second elements, And pulse counter, first trigger, first inverter, differentiation element, the output of the first inverter is connected to the first input of the first trigger, the output of which is connected to the input of the differentiation element, the output of the reference pulse generator is connected to the first input of the first element And whose output is connected to the first input of the counter pulses, characterized in that, with the aim extensions of functionality, the first and second comparators, the second trigger, the electronic key, the second and third inverters are entered into it, the second input of the first comparator is connected to the analog input of the electronic key and connected to the first input of the device, the first input of the first comparator is supplied with a reference voltage, and the output is connected to the first input of the second element And, the second input of which is connected to the second input of the device, and the output of the second element And is connected to the input of the second trigger, the output of which is connected to the control input of the electronic key, the output of which is connected to the first input of the second comparator, to the second input of which the reference is fed - / WV- - / I 6 y d FIG. 2 0 voltage, and the output is connected to the input of the first inverter and the second input of the first element I, the third input of which is connected to the input of the second inverter and connected to the output of the first trigger, the output of the second inverter is connected to the second input of the first trigger, the third input of which is connected to the output of the differential element - fermentation and the input of the third inverter, the output of which is connected to the second input of the pulse counter.