SU754354A1 - Digital meter of single time intervals - Google Patents

Description

The invention relates to electrical engineering and can be used to measure the duration of a single time intervals

Known gauges single time intervals, based on the use of multiple shift pulses of exemplary frequency, containing a pulse counter, generator exemplary frequency, delay line, coincidence circuit and trigger register U. ^one

Of the known devices for measuring single time intervals, the closest one is to measure. The time intervals, containing an exemplary frequency generator with an auto-tuning system, a pulse counter, whose input is connected to the output of the coincidence circuit, a control trigger, the first input of which is connected to the input terminal of the measured time interval, and interpolator made according to the delayed coincidence scheme £

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However, this device has a relatively low frequency stability and does not allow measurements, the duration of time intervals with a sufficiently high accuracy.

The aim of the invention is to increase the measurement accuracy.

The goal is achieved by introducing an interpolator, group coincidence circuits, three collecting circuits, two triggers and a delay element, the output of the crystal oscillator of the reference frequency is connected to the input of the first interpolator, the outputs of the first interpolator register and the first and second inputs of group coincidence circuits, the outputs of which are connected to the first input of the coincidence circuit through the first collection circuit, the second input of which is connected to the output of the control T via a delay element iggera outputs group schemes interpolator circuit via the second collection are connected to a second input of the first

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the trigger, the output is connected to the second inputs of group interpolator coincidence circuits, the first input is connected to the first input of the control trigger, the input of the second interpolator is connected to the output _{5 of} the first collecting circuit, the outputs of the second interpolator group circuits are connected to the second inputs of the control and second trigger, the output of which is connected ¹⁰

the second inputs of the second group of coincidence circuits of the interpolator and the first input - to the input terminal ¹ end iemerya- emogo time interval. '

The drawing shows a block diagram 15 of the digital meter single time intervals.

The device contains a pulse counter 1, a coincidence circuit 2, a delay element 3, a control trigger 4, a quartz oscillator of exemplary frequency 5, an interpolator 6 consisting of a multichannel delay line 7, group coincidence circuits 8-10, and register triggers 11-13, group matching schemes 25

14-16, the interpolator 17, consisting of a multichannel delay line 18, group matching schemes 19-21 and triggers of register 21-24, two triggers 25 and 26 and three collecting circuits 27-29. thirty

The output of the generator 5 is connected to the first input of the circuit 8, which is connected to the input of the delay line 7, the outputs of which are connected to the first inputs of the other circuits 9-10 matches. ₃₅

The second inputs of the 8–10 coincidence circuits are interconnected and connected to the output of the trigger 25, the outputs of each of them are connected to the first inputs of the corresponding triggers 11–13, the outputs of which 4θ are connected to the second inputs of the group coincidence circuits 14–16. The first inputs of the matching circuit 14-16 are connected with the first inputs of the matching circuit 810, the outputs through the collection circuit 27 45

connected to the second input of the coincidence circuit 2, the output of which is connected to the input of counter 1. The output of the control trigger 4 via delay element 3 is connected to the first input of the circuit 2 with ₅ θ drops, the first input to the input terminal of the beginning of the measured interval and the first input of the trigger 25 The inputs of circuit 28 are connected * with the outputs of circuits 8-10, output with the second trigger input 2 5. Input $$

the delay line .18 is connected to the first input of the circuit 19 and connected to the output of the collecting circuit 27, the outputs to the first inputs of the coincidence circuits 20-21.

The second inputs of the matching circuits 19-21 are interconnected and connected to the output of the trigger 26, the outputs of each of them are connected to the first inputs of the corresponding triggers 22-24 and the inputs of the collecting circuit 29, the output of which is connected to the second inputs of the triggers 4 and 26. The first output of the trigger 26 is connected to the input terminal of the end of the measured time interval.

Before starting the measurement, all elements of the device are reset. With the arrival of the pulse of the beginning of the measured time interval "Start" of the trigger 4 and 25 is established in a single ι states

The resolving potential from the output of the trigger 25 opens group matching schemes 8-10. The first impulse received at the first input of circuit 8 from the generator 5 output or at the first inputs of circuits 9-10 from a certain output of the multichannel delay line 7 sets the corresponding trigger 11-13 of the interpolator 6 register to one state and through the collecting circuit 28 to the zero state the trigger 25, thereby prohibiting the passage of the remaining pulses of circuits 8-10.

The enabled trigger 11-13 opens one of the circuits 14-16, thereby connecting the corresponding series of quantizing pulses through the circuit 2 7 to the input of the coincidence circuit 2. The resolving potential of the trigger 4 through a time equal to the delay of element 3 and sufficient for the first pulse of the quantizing frequency overturned trigger register 11-13, not received at the input of counter 1, opens circuit 2. Counter 1 counts the number of pulses of a quantizing series. With the arrival of the stop pulse, the trigger 26 is set to one state and opens circuits 19-21. The first impulse that appeared at the output of one of the circuits 19-21 sets the corresponding trigger register 22-24 to one state and triggers 4 and 26 to the zero state, closing the coincidence schemes 2 and 19-21.

The pulse counter will contain the values of the high-order bits of the result in * binary-decimal, and the register of the second interpolator will contain the values of the lower digits of the measurement result in the position code.

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Claims (1)

Claim A digital meter for single time intervals, containing an exemplary frequency generator, a pulse counter, the 5th input of which is connected to the output of the coincidence circuit, a control trigger, the first input of which is connected to the input terminal of the beginning of the measured time interval, and an interpolator made according to the 10 delayed coincidence circuit, characterized that, in order to increase the measurement accuracy, a second interpolator, group coincidence circuits, three collecting circuits, two triggers and a delay element, and the quartz output the generator of the reference frequency is connected to the input of the first interpolator, the outputs of the delay line and the triggers of the first interpolator register are connected respectively to the first and second inputs of group matching circuits, the outputs of which through the first collecting circuit are connected to the first input of the matching circuit, the second input of which is through element 25 delays are connected to the output of the control trigger, the outputs of the interpolator group circuits are connected to the second input of the first trigger through the second collection circuit, the output of which is connected to the second inputs of the interpolator group circuits, the first input to the first input of the controlling trigger, the second interpolator input is connected to the output of the first collecting circuit , the outputs of the group circuits of the second interpolator through the third collection circuit connected to the second inputs of the control and the second trigger, the output of which is connected to the second inputs of g uppovyh coincidence circuits of the second interpolator, a first input - input terminal end of the measuring time interval. •