SU767694A1 - Device for measuring time intervals between arbitrary length pulses - Google Patents

Description

The invention relates to the field of measurement technology, and can be used in digital measurements of the probability characteristics of small fluctuations of periodic time intervals. A digital device for measuring the probabilistic characteristics of fluctuating time intervals containing a quantizing impulses generator, pulse generator, beginning and end of the measured interval, trigger, coincidence circuits, pulse counter, two adjustable delay lines and a time setting device 1 are known. The main disadvantages -devices are the impossibility of measuring the standard deviation of small -fluctuations of time intervals for any law of fluctuation of fluctuation and a relatively low accuracy The measurement of the standard deviation. The purpose of the invention is to improve the accuracy and to make it possible to measure the standard deviation of small fluctuations of time intervals. The goal is achieved by introducing a delTel code whose input is connected to the counter output, and the outputs of the master device are connected to the control inputs of the counter and code divider. The drawing shows the block diagram: a meter for small fluctuations of time intervals. The meter of small fluctuations of the time intervals contains the shaper 1 of the pulses of the beginning of the measured interval, the shaper of 2 pulses of the end of the measured interval, the regulation, the delay line 3 of the delay, trigger 4, one input of which is connected to the simulator 1, and the second with the output of the former 2 through an adjustable 3-line delay, and the trigger output is connected to a chain of successively connected matching circuits 5 and 6, a 7-pulse counter, and a code divider 8, the output of which is connected to the control input of the adjustable line 3 rear rzhki and quantizing the pulse generator 9 and the time setting unit 10, the oscillator output pulses oeDinen 9 quantizing circuit 5 to the inputs of a coincidence and a time setting device 10,

The d-outputs of the time setting device are connected to the corresponding inputs of the counter, 7 pulses, the divider 8 (the code and the matching circuit 6.

Measuring small fluctuations time--. MeHHiix intervals, post-clock by non-synchronous method, works as follows.

Start-impulse through the fop / driver 1 is fed to one of the separate inputs of trigger 4, to the other input of which a stop-impulse is fed through the imaging unit 2 and the series-connected adjustable delay line 3, initially set

on the control, e. to the input to zero: Value, From the trigger output 4. The generated time interval is fed to one of the inputs of the 5 coincidence circuit. To the other input, the quantizing pulses with the repetition period tg from the generator of 9 quantizing pulses are sent. Packs of quantizing pulses (), the number of which to N, | the time is determined by the device 10 using the scheme 6 coincident, and to the input of the pulse counter 7, in which a code is accumulated proportional to the total - duration of the measured time intervals. The code value of the mathematical parameter is change-. The measured time intervals from the output of the counter, the pulses, are fed to the divider 8 of the code, in which it is divided by the value of the period of the quantizing pulses tp,. ,

.. Msh-. 11-01 o

where the integer number of periods S; kladygJ-aJOIIIXX in, a ai - double; part of the mathematical expectation expressed in terms of the period tg.

 The fractional value obtained in the code divider is fed to the control input of the adjustable line for the center, setting a new delay value,

After that, make a second series of Nj single time interval measurements, the duration of each of which, after the first series of tests N, is artificially increased using an adjustable delay line.

The results of single measurements of the second series of tests N, j are taken from the output of the pulse counter 7.

At the same time, the standard deviation of small fluctuations of measured time intervals is determined by the standard formula

g

BM / s (t., - MM)

Claims (1)

Invention Formula Measuring instrument for small fluctuations of time intervals, containing the beginning and end pulse shapers 5 measured interval, the trigger, one input of which is connected to the output of one fork of the spinner directly, and the other input through the adjustable delay line to the output of another forwarder, two series-connected coincidence circuits connected to the output of the trigger and the input of the pulse counter, generator of quantizing pulses connected to the first , 5 to the coincidence circuit and to the time setting device, distinguished by the fact that, in order to increase accuracy and enable measurement of the mean square, the small deviation of small fluctuations of time intervals, a code divider was inserted into it, the input of which is connected to the output of the counter, and the outputs of the time setting device are connected to the control inputs of the counter and code divider. 5Ir fordia sources, taken into account in the examination 1, USSR Author's Certificate W 407270, class, G 04 F 10/04, 1971.