SU381168A1 - DEVICE ADJUSTABLE DELAY - Google Patents

Description

I

The invention relates to a radio measuring technique.,

A variable delay device is known which contains a master oscillator connected via a key circuit to a counter, a control trigger connected by an input to a source of trigger pulses and an output to a control input of a key circuit, a variable voltage generator connected by its output to one of the amplitude discriminator inputs , a blocking trigger, the inputs of which are connected to the outputs of the key circuit and the reset pulse generator connected by its output with the input “Reset of the counter.

The purpose of the invention is to improve the accuracy of compensation of the time error caused by the non-electronics of the triggering pulses with the pulses of the master oscillator. It is achieved by the fact that the proposed device is equipped with a second generator of varying voltage, connected by its start input with the counter output and output with the second input of the amplitude discriminator. In this case, the start input of the first variable voltage generator is connected to the output of the blocking trigger, and its stop input is connected to the source of trigger pulses via a delay element.

The drawing shows a block diagram of the proposed device.

The adjustable delay device contains the master oscillator /, key circuit 2, counter 3, control trigger 4, reset pulse shaper 5, blocking trigger 6, delay element 7, first variable voltage generator 8, discriminator I, second alternating voltage generator 10 .

The triggering pulse triggers a control trigger 4, which opens the key circuit 2, through which the pulses of the master oscillator / are fed to the input of the counter 3, counting the number of pulses determined by the set delay.

The first pulse appearing at the input 1 of the key circuit 2 overturns the trigger 6. A voltage drop at its output triggers the alternating voltage generator 8. The magnitude of the voltage of this generator is reached by the moment of arrival of the triggering pulse that has passed delay element 7 with an electric length equal to the period of the signal of the master oscillator /, is fixed. Then, the time interval between pulses is stored, converted to a voltage level of 1 ::. The output voltage of the generator 10 triggered by a pulse from the output of counter 5 is compared with this level. When the voltages of both generators with the same time-amplitude conversion factor become the same, the discriminator 9 generates an output delay pulse, the delay of which is relative to the trigger pulse equals

  v.z. + Fri:

where te.z. - the value of the delay element 7;

n - the number of pulses counted

account ed, m 3;

t-period of the signal of the master oscillator.

The magnitude of the delayed pulse does not depend on the time of arrival of the trigger pulses relative to the pulses of the master oscillator.

The temporal instability of the delayed pulse relative to the triggering device in such a device can be reduced as compared to the prototype at a time.

Subject invention

An adjustable delay device containing a master oscillator connected via a key circuit with a counter, a control trigger connected by an input to a source of trigger pulses and an output to the control input of a key circuit, a variable voltage generator connected by its output to one of the | ,AT

amplitude discriminator, blocking trigger, whose inputs are connected to the outputs, key :; The circuits and the forma-tion of the reset pulses connected by their output € 0 by the input of the counter reset, characterized in that, in order to improve the compensation of the time error caused by the asynchronous trigger pulses of the master oscillator, it is equipped with a second oscillating generator ; with a voltage connected by its input to the output of the counter and an output to the second input of the amplitude discriminator, while the starting input of the first generator of the variable national is connected to the output of the blocking trigger, and its stopping input is with a source of triggering pulses through a delay element.