SU507854A1 - Interval meter - Google Patents

Description

I

The invention relates to a technique and the measurement of short time intervals.

Known time interval meter containing an input shaping device, the first output of which is serially connected to a trigger, the second input of which is connected to the second output of the input shaping device, to the main selector, to the second input of which is connected, the oscillator of the reference frequency, and to the main counter, and the second output of the input shaping device is connected to an additional counter via an additional counter control circuit comprising a trigger and a shock excitation generator Eni connected to the input forming device, and 1 selector connected to the trigger output.

The well-known interval meter, due to the limited speed of elements, has a low resolving power; /,. ..; ;

The proposed time interval property is different from the fact that it is equipped with a second control circuit

the counter connected to the second output of the input forming device. Both control circuits for an additional counter contain mixers, | phase shifters, plant amplifiers, threshold devices, -li circuits and delay elements .: The mixers are connected to shock excitation generators and through phase shifters with the oscillator of the reference frequency, and the outputs of the mixers to the threshold amplifiers devices with “.I” circuits, the second inputs of which are connected to the input shaping device through delay elements, and the outputs are connected to triggers.

This increases the resolution of the measure. G;

In FIG. 1, a breaker diagram is shown; in fig. timing charts .- - ..;. ; -.

Claims (1)

Output shaping devices 1 with input A, through which the start pulse is applied, and input B, through which the stop pulse is applied, are connected to trigger 2 of the control circuit of the main counter Trigger 2 connected to the selector 3, the input of which is a source signal of the reference frequency fg which is combined with the main counter 4. / The outputs of the input shaping devices are connected to the inputs of the generators 5 and 6. shock excitations, the signals from which are fed to the 7 n 8 mixers, To the second inputs of the 7 n 8 mixers are connected through phase shifters 9 and 1O oscillator of the reference frequency. Outputs mix; Ley 7 and 8 through low-frequency amplifiers 11 and 12 and threshold devices 13 and 14 are connected, respectively, with And 15 and 16 type tams, the second inputs of which are connected to input shaping devices through delay elements 17 and 18. The outputs of the elements 15 and 16 are connected to the triggers 19 and 2O of the control — electrons of additional counters. Triggers are connected by their inputs to the input shaping device “1. The output signal of the flip-flops 19 and 2O is fed to the selectors 21 and 22 of the additional meter 23 whose second inputs are connected to the oscillator of the reference frequency. The meter time intervals works as follows. With the arrival of the start-pulse ;, the input shaping device, at 1, the voltage drop at the required input signal levels, which starts the generator of percussion excitation 5 and overturns the triggers 2 and 19. The pulses of the oscillator of the reference signal go through the open selector 3 to the main the counter 4 and through the open selector 21 to the additional counter 23. The main counter measures the time interval tfi (see Fig. 2), the additional counter measures the time interval tl specified by the intermediate signal frequency received on the mixer 7J. ° The signal from the generator 5 of shock excitation is mixed with the reference frequency signal fed to the mixer 7 through the phase shifter 9, thereby compensating for the delay introduced by the circuit elements, and also eliminating the effect of the difference between the initial phase of oscillator oscillations 5 from zero. The intermediate frequency signal received at the mixer 7 through the low-frequency amplifier 11 is fed to a threshold device 13, which absorbs the signal normalized by the duration of the edges and amplitude to the selector 1. The latter is controlled by the time delay 17, which is triggered by a start pulse and generates a prohibition signal at some predetermined time. : The difference of the required polarity from the output, AND circuit 15, the first of those passing through oxfflvty iM after tipping trigger 19, returns trigger 19 to its original state {| sha, closing selector 21.. With the arrival of the stop pulse, the shock excitation generator of 6 g starts up in a similar way, and the trigger 2 returns to its initial state, closing the selector 3. The trigger 2O tilts. ; Lvts 7 by opening the selector 22, through koby; high pulses from the oscillator of the reference frequency arrive at an additional counter 23. The signal of the generator 6 is mixed with the signal of the reference frequency fed to the mixer 8 through the phase shifter 10. the threshold device 14 and, having passed through the selector 16, controlled by the element of the time delay 18, triggered in turn by the stop pulse, returns the trigger 2O to the initial state, closing the selector 22. At this stage of operation, {, / lerite l la manufactured measurement intervals tj (FIG. 2). The proposed interval meter (time allows to measure intervals of the order of 1 ns. I The invention The interval time meter containing the input forming device, the first output of which is connected in series with a trigger, the second input of which is connected to the second output of the input forming device, c the main selector, to the second input of which an oscillator of the reference frequency is connected, and to the main counter, and the second output of the input forming device is connected to an additional counter Through the control circuit, an additional oscillator, containing a trigger and a shock excitation generator, connected to the input shaping device, and a selector connected to the trigger output, which is characterized by the fact that, in order to increase the resolving power, an additional counter control circuit subconnected to the second output of the input shaping device, with both additional counter control circuits containing mixers, phase shifters, low frequency amplifiers, threshold devices, And And and the delay elements, mixers are connected to the generators of the shock excitation and S5 st 55 " la J TT  ""