SU417734A1 - - Google Patents

Description

one

The invention relates to the field of measuring equipment and can be used in systems for collecting, storing and testing information.

According to a known method of measuring time intervals using a magpithophone for recording and reproducing measured time intervals with the exception of the error caused by the instability of the speed of drawing a tape in the playback mode, the reference frequency from the second track passes through the key to the counter, filling the time intervals obtained in the formation unit and the output of the first track.

However, the possibilities of such a snapshot are limited, since the ratio of the measured and reference intervals must be large to obtain the minimum accuracy of the discreteness.

For example, for a relative error of 1% discreteness, this ratio should be greater than 100. The reduction of reference intervals is limited (for example, for most household tape recorders, the limit is 10 KHZ, which corresponds to 10 sec). Therefore, when measuring time intervals smaller than 10 sec, a discretization error occurs, greater than 1%, which increases with a decrease in the measured interval.

According to the proposed method, the filling of time intervals is performed by periods from a separate reference generator, the recalculation

The pulses are carried out with a variable counting coefficient, which is continuously varied depending on the measurement results of the reference intervals recorded on the tape. The drawing shows a block diagram of an apparatus for carrying out the method. The circuit contains a shaper 1, a generator 2 of a reference frequency, a tape recorder 3, a node 4 for the formation of measured intervals, a key 5, a counter b s

variable coefficient of the account, the generator 7 of the reference frequency, the node 8 of the choice of the coefficients of the account, the driver 9 reference intervals, the key 10 n counter 11.

In playback mode, the circuit works

in the following way.

From the tape recorder output, the signals of the reference frequency are fed to the driver 9, which pbiii controls the key 10. The pulses from the reference generator 7 through the key 10 are fed to the counter 11 and are calculated in it. Thus, a continuous measurement of reference intervals occurs. During the time between the measurements of the reference intervals, the node 8 selects and sets in the counter 6 the need for G1 counting coefficient. On the other hand, the node 4 for forming measured intervals opens the key 5 for the time of the formed, measured interval. Impulses from the lawyer 7 through the key 5 give 1c to the counter b

and are calculated with the counting factor selected by node 8. The proposed method allows to exclude

the error caused by the instability of the speed of the tape when measuring time intervals varying within very wide limits. Moreover, in the process of measuring large time intervals, a correction may be introduced into the measurement by a polycate. One more time than one measurement.

PROPERTY AND -LETTER: AND AND

A method for measuring the time interval, ia, is used to simultaneously record measured and reference time intervals on one tape, followed by using reference intervals to fill the measured, so that, in order to reduce errors, filling the interuajioii time with the periods from the business of the reference reference generator, not) esche1L uyulsov () ssss1vl yu1 with ismeramp 1st coefficient and 1SM 1H) m schsg ;, iiOTopbui) epbiBi (j dzMS 1, ;; () H i dependent 1 from the results of measurements of the samples recorded on tape.