SU1492311A1 - Device for measuring time of transient process - Google Patents

Abstract

The invention relates to the field of measurement technology, in particular, to devices for measuring time intervals. The aim of the invention is to improve the accuracy of transient time measurements. The goal is achieved by introducing a delay element 3, a differential amplifier 4, a voltage comparator 6, by means of which an exact determination is made of the instant of the end of the transient process both by the magnitude of the signal amplitude and by the magnitude of the derived signal. In addition, the device contains a 1-step voltage generator, a test object 2, a voltage comparator 5, an OR-NOT 7 element, a forward level driver 8.9, a clock frequency generator 10, an RS flip-flop 11, a counter 12. 2 Il.

Description

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Interpretation is related to information technology, most often with devices for measuring time intervals.

The aim of the invention is to increase T (accuracy of transient time measurements).

FIG. 1 is a block diagram of the proposed device; in fig. 2 - timing charts of the device.

The device for measuring the transient time contains a 1-stage voltage generator, a test object 2, a delay element 3, a differential amplifier, 4, three-input voltage comparators 5 and 6, an OR-HE element 7, a forward-looking 8 and 9 drivers, a 10-clock generator frequency, RS-trigger I, counter 12, and the output of the generator 1 step voltage is connected to the input of the front-side imager 9, the output of which is connected to the input of the unit to the zero of the counter 12 and the input of the installation to the unit of RS-trigger 11, the direct output of which The sensor is connected to the counting input 12 of the counter, and the inverse is connected to the output of the measurement end indication, the bits of the counter 12 are connected to the output of the device, the control inputs of the sensitivity zone of the first 5 and the second 6 voltage comparators are combined and form the control input OR-NOT 7 is connected to the input of the front edge imager 8, the output of which is connected to the setup input to the zero of the RS flip-flop 11, the output of the clock frequency generator 10 is connected to the synchronous input of the counter 12, the output of the stupas generator The stage voltage is connected to the input of test object 2 and the threshold voltage input of the first three-input voltage comparator 5, the output of the test object 2 is connected to the signal input of the first voltage comparator 5, the first input of the differential amplifier and the input of the delay element 3, the output of which is connected to the second input of the differential amplifier 4, the output of the latter is connected to the signal input of a three-input voltage comparator 6, the reference voltage of a kloporo is connected to an antenna; iiinHoii device, outputs IU pBOrc 5 and B1 (Chr (1G (1 6

three input voltage comparator (1p) and voltage are connected to the first and second inputs of the IPI-IC 7 element.

FIG. 2 shows the time diagrams of the operation of the device in case of different characters of transient processes.

0 oscillatory (Fig. 2a), exponential-lнoro (Fig. 2 c) and aperiodic (Fig. 2 b) character, possible with different structures of the object 2 tested. The time diagram denotes: the voltage at the output of the generator 1 Up,, the voltage at the output of the object 2 measurements Uot the voltage at the output of the element 3 delay Uoj, the voltage at the output

0 comparator 5 - a, the voltage at the output of the comparator 6-6, the voltage at the output of the RS flip-flop 11 - in.

The device works as follows.

5 in the initial state, the trigger 11 is in the state O, and from its output a prohibitory signal is applied to the input of the counter 12, in view of which the time signal of the transition time

0, the process coming from the output of the generator 10 does not change the state of the counter 12. At the outputs of the comparators 5 and 6 there is a high potential, and at the output of the imaging unit 8 there is a zero potential. Before the measurements are started, a voltage is determined at the input of the control of the sensitivity zone, which determines the width of the sensitivity zone of com- pactors 5 and 6, which determines the accuracy at which the transient process is considered complete.

The operation of the device begins with the input from the output of the generator 1 through 5 of a positive voltage drop of a certain level, which is fed to the input of the comparator 5, where it is used to set the value of the middle of the sensitivity zone of the comparator 5, to the input of the test object 2, as well as to the input of the imaging unit 9. Herewith shaper 9 generates a sync signal arriving at the H input of the counter 12, which leads to the installation of the latter in the zero state, as well as the 5 input of the trigger 11 and translates the latter into a single state, while the input of the counter 12 receives a signal times5

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1n: - 1cccccountry account, and from gsri.-imm nre- memi,) 1111 units. 1 em mmpult at the output i Hfp; iTiip, i 10, the change in KOfia occurs at the output Q of the device. At the same time, the zero potential is set to a zero potential signaling the operating state of the device. The voltage from the object (5 of object 2, characterizing the transient process in it, is fed to the input of the comparator 5, to one of the inputs of the differential amplifier 4 and through the delay element 3, to the other its input. Depending on the structure of the object 2, the voltage on The inputs of these blocks may vary according to the functions shown in Fig. 2 a, b, c.

The transition process is considered complete if

x (t) Ivon - y. and (1)

x (t) to I Uon - Un, 2) 25

de x (t) - the transition process;

x (t) is the first derivative of the transition process x (t) .; K is the gain of the amplifier 4, which makes it possible to harmonize the sensitivity zones in x (t) and x (t),

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meaningfulness.

In this case, if the condition (.1) is satisfied, then at the output of the comparator 5 there will be a zero potential (Fig. 2, a), the condition (2) is satisfied, then at the output of the comparator 6 a zero potential is established (Fig. 2.6)

The joint fulfillment of conditions (1) and (2) leads to the appearance of a high potential at the output of an OR-NOT 7 element, a positive differential voltage across its output drives the driver 8, and its output pulse sets the trigger 1I to zero (Fig. 2). , c). This leads to the termination of the counting of the transient time by the counter 12 and the installation of a signal. End of measurements at the output of trigger II. This completes the measurement cycle and the transient time code is at the output of the device until the beginning of the next measurement cycle.

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Form u l l and 3 about b ete n i

A device for measuring the transient time, containing a step voltage generator, terminals for a polkkmenmen of the test object, a three-way voltage comparator, an IPI-NE element, for a leading edge generator, a clock generator, an RS trigger, a counter, and the generator output step voltage is connected to the input of the first front-edge driver, the output of which is connected to the installation input to the O counter and the installation input to 1 RS flip-flop, the direct output of which is connected to the counting input input i, and inverse to the output indication of the measurement end of the device, the outputs of the counter bits are connected to the information output of the device, the control input of the sensitivity zone is connected respectively to the control inputs of the sensitivity zone of the first and second voltage comparators, the output of the OR element is NOT connected to the input the second front-edge driver, the output of which is connected to the installation input to the RS-flip-flop, and the output of the clock frequency generator is connected to the synchronous input of the counter, which is different in that Improving the measurement of transient time, it additionally contains a delay element, a differential amplifier, a second three-input voltage comparator, the output of the step voltage generator connected to the input terminal for connecting the test object and the input voltage threshold of the first three-input voltage comparator, output terminal for connecting the test object to the input to the signal input of the first three-input voltage comparator, the first input of the differential amplifier, and the input The two elements of the delay element, the output of which is connected to the second input of the differential amplifier, the output of the latter is connected to the signal input of the second three-input voltage comparator, the input voltage of which is connected to the common bus of the device, the outputs of the first and second three-input voltage comparators are respectively connected to the first and the second inputs of the element OR-FiE.

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Claims (1)

Formula ts A transient time measuring device containing a step voltage generator, terminals for connecting a test object, a three-input voltage comparator, an OR-NOT element, for a leading edge generator, a generator clock frequency, RS-trigger, counter, moreover, the output of the step voltage generator is connected to the input of the first leading edge driver, the output of which is connected to the installation input at 0 counter and the installation input at 1 RS-trigger, the direct output can be changed according to the functions shown in FIG. 2 a, b, c. The transition process is considered complete if x (t) - | U _on U _B , | 4, (1) x ¹ (t) = K I and _op - and ₀ , | έ U _n , (.2) where x (t) is a transient process; x) (t) is the first derivative of the transient x (t). ’, K is the gain of amplifier 4, which allows matching sensitivity zones with respect to x (t) and x '(t); U _on - the value of the threshold of the sensitivity zone. Moreover, if condition (1) is satisfied, then at the output of comparator 5 there will be a zero potential (Fig. 2, a), and * if condition (2) is fulfilled, then at the output of comparator 6, zero potential will be established (Fig. 2, b) . which is connected to the counter resolution enable input, and the inverse to the output of indicating the end of the measurement of the device, the outputs of the bits of the counter are connected to the information output of the device, the sensitivity zone control input is connected respectively to the sensitivity zone control inputs of the first and second voltage comparators, the output of the OR element - NOT connected to the input of the second leading edge driver, the output of which is connected to the input of the 30 0 RS-trigger, and the output of the clock generator is connected to the clock a meter house, characterized in that, in order to increase the accuracy of measuring the transition time, it additionally contains a delay element, a differential amplifier, a second three-input voltage comparator, the output of the step voltage generator being connected to the input terminal 10 <· _ for connecting the test object and the input of the threshold voltage of the first The joint fulfillment of conditions (1) and (2) leads to the appearance of a high potential at the output of the OR-NOT 7 element, a positive voltage drop across its exhaust excites the driver 8, and the pulse of its output sets the trigger 11 to the zero state (Fig. 2, c) . This leads to the termination of the transient time count by the counter 12 and the installation of the signal End of measurements at the output of the trigger 11. At this point, the measurement cycle ends and the time code of the transient process is at the output of the device until the start of the next measurement cycle. a three-input voltage comparator, an output terminal for connecting a test object connected to the signal input of the first three-input voltage comparator, the first input of the differential amplifier, and the input of the delay element, the output of which is connected to the second input of the differential amplifier, the output of the latter is connected to the signal input of the second three-input voltage comparator, input the reference voltage of which is connected to the common bus of the device, the outputs of the first and second three-input voltage comparators are connected with responsible for the first and second input of the NOR. I FIG. 2