SU1335921A1 - Device for measuring time intervals - Google Patents

Abstract

The invention is intended to improve the accuracy of measuring time intervals. The device contains. generators 1 and 2 are shock excited. neither, counters (C) 3 and 4 pulses, block 5 delay, driver 6 pulses, element 7 and block 8 comparison of codes. C 9 is inserted into the device, which serves to count the number of achievements of equality of the C 3 and 4 codes. The overflow pulse C 9 stops the shock excitation generator 1 and zeroes C 4. In addition, the pulse does not. Replenishment C 9 serves as a signal for the end of measurement and is used to read measurement results from C 10. 1 sludge. l 10 00 00 cl - -J -

Description

The invention relates to a pulse technique, in particular to a time interval meter,

- The purpose of the invention is to improve accuracy.

The drawing shows a functional diagram of a device for measuring time intervals.

The device contains the first and the second. swarm shock excitation generators 1 and 2, first and second counters of the 3rd 4 pulses, delay block 5, pulse shaper 6, element 7, block 8 of code comparison, third and fourth counters 9 and 10 pulses of the first input bus 11, second input bus 12. The start inputs of the first and second generators 1 and 2 are connected respectively to the input buses 11 and 12, the output of the first generator 1 is connected by ccf counting inputs of the first counter 3, the fourth counter 10 and through the serially connected delay block 5 and driver 6 to the first input of the element And 7, The second input of which is connected to the output of the code comparison unit 8, the first inputs of which are connected to bit B1 inputs of the first counter 3, the reset input of which is connected to the output of the And 7 element, to the counting input of the third counter 9 and the stop input of the second generator 2, output which is connected to the counting input of the second counter 4, the bit outputs of which are connected to the second inputs of the code comparison unit 8, the output of the third counter 9 is connected to the stop input of the first generator 1 and the reset input of the second counter 4.

The device works as follows.

The impulse of the beginning of the measurable.

the terminal t arrives at the input bus 11, the generator 1 is started, at its output a main sequence of pulses is formed with a period of investigation To. The pulses of the main sequence are counted by counters 3 and 10. The pulse of the end of the measured interval arriving at the input bus 12 is. A generator 2 is started, at the output of which an auxiliary sequence of pulses is formed with a period of T. The pulses of the auxiliary sequence are counted by counter 4, the number of input-ix

0

five

5921

0

2

the counter 3 and 4 pulses are compared in block 8 of code comparison, at the output of which the potential of the logical unit is formed when the codes at the output of counters 3 and 4 become equal. The state of block 8 is reflected in discrete time moments by short pulses of the imaging unit 6, which is triggered by the pulses of the main sequence that are delayed in block 5. I,

After reaching the first equality of the codes of the ZIL counters, the pulse of the former 6 through the AND 7 element closes the counter 3, stops the generator 2, the counted number of pulses of the auxiliary sequence is subsequently stored in the counter 4. one

The counting of the pulses of the main sequence is continued by the counter 10 and again from the zero code by the counter 3, and after each reaching the equality of the code of the counter 3 and the stored code in the counter. 4, counter 3 is zeroed and the pulse count of the main sequence in counter 3 starts from zero. In counter 9, the number of achievements of equality of the codes of counters 3 and 4 is counted. The capacity n of counter 9 is set to measure according to the required accuracy, the resolution and the measuring range. After n achievements of equality of codes, counter 9 has zeroed-out. c, and the overflow pulse from its output stops the generator 1 and zeroes the counter 4. The overflow pulse of the counter 9 serves as a signal for the end of the measurement and is used to read the measurement result from the counter 10.

five

0

0

The measurement result N, recorded in the counter 10, is associated with the measured value tv. by ratio

N t.

That -T,

at

relative measurement error is

sGy .. 4- (cC-o) (1),

oh

where fa to cGy is the quantization error of the reference and auxiliary sequences, respectively.

3133

Formulas of the invention

A device for measuring time intervals, containing two generators of shock excitation, is the first. and the second pulse counters, block, delays, pulse shaper, code comparison block, element I, the start inputs of the first and second shock wave generators are connected respectively to the first and second input buses, the output of the first shock excitation generator is connected to the counting input of the first pulse counter and through successively connected delay block and pulse shaper — with the first input of the element I; the output of the second shock excitation generator is connected to the counting input of the second counter pulse characterized in that.

one

In order to increase accuracy, the third and fourth pulse counters are entered into it, the counting input of the third pulse counter is connected respectively to the zero input of the first pulse counter, the stop input of the second shock excitation generator and the output of the And element, the second input of which is connected to the output of the code comparison unit, the first and the second groups of inputs of which are connected respectively to the bit outputs of the first and second pulse counters, and the output of the third pulse counter is connected to the zero zero input W cerned counter pulses and the stop input of the first impact excitation generator whose output is connected to the input of the fourth pulse counter.

Claims (1)

SUMMARY OF THE INVENTION A device for measuring time intervals, comprising two shock excitation generators, a first and second pulse counters, a block, a delay, a pulse shaper, a code comparison unit, an And element, trigger inputs of the first and second shock excitation generators are connected respectively to the first and the second input buses, the output of the first generator of shock excitation is connected to the counting input of the first pulse counter and through a series-connected delay unit 15 and the pulse shaper - with ne the first input of the element And, the output of the second generator of shock excitation is connected to the counting input of the second pulse counter, 20 characterized in that, in order to improve accuracy, the third and fourth pulse counters are introduced into it, and the counting input of the third pulse counter is connected respectively to the zeroing input of the first counter pulses, the stop input of the second shock excitation generator and the output of the And element, the second input of which is connected to the output of the code comparison unit, the first and second groups of inputs of which are connected respectively, with the discharge outputs of the first and second pulse counters, and the output of the third pulse counter is connected to the zero input of the second pulse counter and the stop input of the first shock excitation generator, the output of which is connected to the input of the fourth pulse counter.