SU1659975A1 - Timer - Google Patents

Abstract

The invention relates to a measurement technique and can be used to measure time intervals. The aim of the invention is to improve the performance of the meter and simplify the design. The time interval meter contains 1 pulse generator, 2 coarse and accurate 3 key switches, 4 counting pulse selector 4, time scale converter 5, delay line 6, triggers 8, 10, OR elements 9, 11, counters 12 accurate and coarse 13 measurements. The time scale converter 5 contains an element OR 14, a trigger 15, a charge-discharge unit 16, a driver 17 pulses. Introduction to the device of the element 2-2IL-7 and 7 and the formation of new connections allows to achieve the purpose of the invention. 2 Il. (L

Description

The invention relates to measuring technique and can be used to measure time intervals in location, spectroscopy, physics of fast processes and high energies.

The purpose of the invention is to increase the speed of the time interval meter and simplify the design by eliminating from the conversion cycle a constant pedestal proportional to two periods of the counting pulses of the reference generator.

In FIG. 1 is a structural diagram of a time interval meter; in FIG. 2 - time diagrams of his work.

The output of the pulse generator 1 is connected to the first inputs of the coarse 2 and 3 keys of accurate measurements and the counting pulse selector 4, the output of which is connected to the first input of the time scale converter 5, the first input and through the delay line 6, the fourth input of element 2-2, OR 7, second and third the inputs of which are connected respectively to the inverse and direct outputs of the trigger 8, the input of which is connected to the second inputs of the selector 4 of the counting pulses, the converter 5 of the time scale and to the output of the element OR 9, the first and second inputs of which are connected respectively, to the start and stop impulse buses, the output of the 2-2I-OR 7 element is connected to the input of the trigger 10, the output of which is connected to the second input of the rough measurement key 2, the output of which is connected to the first input of the OR element 11, the second input of which is connected to the output of the senior discharge counter 12 accurate measurement, and the output is connected to the input of the counter 13 coarse measurement, the input of the counter 12 accurate measurement is connected to the output of the key 3 accurate measurement, the second input of which is connected to the output of the Converter 5 of the time scale.

In addition, in the time scale converter 5, the first and second inputs are connected to the corresponding inputs of the OR element 14, the output of which is connected to the input of the trigger 15, the output of which is connected to the input of the charge-discharge block 16, the output of which is connected to the input of the pulse shaper 17, the output of which is the output of the time scale converter 5.

The device operates as follows.

In the initial state, the triggers 10, 8 and and the coarse and accurate measurement counters 13 and 12 are set to zero. Rough key 2 is held by a trigger

10, and the key 3 accurate measurement - shaper 17 in the closed state. In block 16 of the charge-discharge, the initial potential is Uo = K'To, where K is the coefficient of the time-amplitude conversion; τ ₀ period of the counting pulses of the generator 1.

The Start pulse passes through the OR element 9 (Fig. 2a), sets the trigger 8 on the edge of the pulse (Fig. 2c), through the OR element 14 sets the trigger 15 into a single state (Fig. 2 and), on the output potential of which the charge unit 16 the discharge begins to convert the time interval into amplitude (Fig. 2 e) and is fed to the input of the selector 4 of the ηth counting pulse (in this case, η = 2). The second after the start pulse counting pulse of the generator 1 (Fig. 2 g, d) from the output of the selector 4 of the counting pulses through the OR element 14 resets the trigger 15, stopping the conversion process, and puts the charge-discharge unit 16 into storage mode (Fig. 2 l ) The same pulse is supplied to the first input and through the delay line 6 to the fourth input of element 2-2I-IL AND 7, the third and second inputs of this element respectively receive enable and disable potentials from the outputs of trigger 8, therefore, the output of element 2-2I -OR 7 passes a pulse delayed by time t _{3 by} a delay line 6 (Fig. 2 e), which sets trigger 10 to a single state (Fig. 2 h). allowing the passage through the coarse measurement key 2 and the OR element 11 to the input of the coarse measurement counter 13 of the counting pulses from the generator 1. The electrical length of the delay line 6 is t ₃ 5: That. It is designed to exclude the first after selected 4 counting pulses of the counting pulse (Fig. 2 e).

The Stop pulse passes through the OR 9 elements (Fig. 2 b), the trigger 8 is reset, through the OR 14 element it sets the trigger 15 to a single state, starting the process of converting the time interval to the amplitude in the charge block 16, but with the opposite sign (Fig. 2 l ), and enters the input of the selector 4 counting pulses. The second counting pulse after the stop pulse of the generator 1 (Fig. 2 e) from the output of the selector 4 of the counting pulses through the OR element 14 resets the trigger 15, stopping the conversion of the charge-discharge time into amplitude by the block 16 and starting the conversion of the amplitude into the time interval. The same signal from the output of the selector 4 counting pulses also goes to the inputs of the element 2-2I-OR 7. but in this case it will go through it5

.. 6 a pulse that was flashed by the delay line 6, which the trigger 10 will reset, thereby closing the coarse measurement key 2 and stopping the passage of the counting pulses to the input of the coarse counter 13 (Fig. 2 k). 5 The sawtooth signal from the output of block 16 is fed to the input of the pulse shaper 17 (extended time interval), which converts the input signal into a rectangular pulse of duration ^ + 1) k> (τι + T2) (Fig. 2 m), where (n +12) .- the sum of the zones of uncertainties between start and stop pulses and subsequent pulses. From the output of the shaper 17, the pulse opens the key 3 of the exact measurement to pass the counting pulses of the generator 1 to the input of the counter 12 of the exact measurement of capacity (K + 1) To (Fig. 2 n). If (K + 1) k x (n + t ₂ )> (K + 1) · Then, then overflow! the counter 12 of the exact measurement, he will add one pulse to the counter 13 of the rough measurement through the element OR 11.

The measured time interval T _and in the meter is represented as the sum of the time intervals t _rp and Тгоч = (τι + тг). In the meter, the operation is such that in the second stage of the conversion, the amplitude - time only amplitude is converted, equivalent to the sum of the zones of uncertainties between the start pulse and the first next counting pulse and the stop pulse and the previous stop pulse, i.e. in block 16 of the charge-discharge is automatically subtracted additional pedestal, equal to (K + +1) 2 That. Therefore, in comparison with the prototype, the conversion time of the exact code is determined as follows.

In the proposed solution, the time T _p necessary for converting the total interpolation interval changes Tn ^ (K + 1) 2 T0 and is on average equal to T _p "" (K + 1) -To.

For the prototype in the first case, if (K + -1) ti <Ti, then (K + 1) Then << Τπί (K + 1) 2 Then and on average T _p »1.5 (K +1) t ₀ : in the second case, if (K + 1) ti> T _{and <} then (K + 1) ti £ Τηί (K + +1 Xti +12). where ti = (T1 + '. That'); t ₂ = (mr + τ ₉ ), then (K + 1) $ο $ Τπ ^ (Κ + 1) 4τ ₀ , or on average Tn »2.5 To (K + 1), i.e. in the proposed meter, the conversion time is reduced depending on the measured time interval in 1.5 - 2.5 times or an average of 2 times.

Claims (1)

Claim A time interval meter comprising a counting pulse generator, the output of which is connected to the first inputs of the coarse and precise measurement keys and a counting pulse selector, a rough measurement counter, an accurate measurement counter, the input of which is connected to the output of the accurate measurement key, the second input of which is connected to the output of the scale converter time, the first trigger, the output of which is connected to the second input of the rough measurement key, the first OR element, the output of which is connected to the input of the second trigger, and the inputs are connected to Resp tires start and stop pulse delay line and a second OR gate, tlichayuschiysya about that. in order to improve performance and simplify the design, an element 2-2IIOR is introduced into it, the output of which is connected to the input of the first trigger, the first input is connected to the fourth input via a delay line and connected to the output of the counter for counting pulses and the first input of the time scale converter, the second input of which connected to the output of the first OR element and the second input of the counting pulse selector, the second and third inputs of the element 2-2IIOR are respectively connected to the inverse and direct inputs of the second trigger, the output of the coarse key rhenium compounds. nen with the first input of the second OR element, the second input of which is connected to the high-order output of the accurate measurement counter, and the output is connected to the input of the coarse measurement counter. Compiled by S. Crowow Editor M. Kelemesh Tehred M. Morgenthal Corrector V. Girnyak Order 1845 Circulation 278 Subscription VNIIIPI of the State Committee for Inventions and Discoveries at the State Committee for Science and Technology 113035, Moscow, Zh-35, Raushskaya nab., 4/5 Production and Publishing Combine Patent, Uzhgorod, 101 Gagarin St.