SU389487A1 - ALL-UNION - Google Patents

Description

one

The proposed device relates to digital computing, can be used in digital instrumentation, in which the measured values are converted to the duration of pulses or time intervals.

A device for controlling the deviation of pulses from predetermined nominal values is known, which contains a programmer. NIC, a reversible decimal counter, coincidence circuits, an anti-coincidence circuit, triggers, a pulse generator, a key, a differentiating chain, the AND and a controlled recalculator, output which, through the first matching circuit, is connected to the summing input of a reversible pulse counter connected to the analyzer.

In the known device, before measuring according to the program, the value of the model time interval must be specified, that is, the maximum allowable deviation of the monitored intervals calculated in advance.

The proposed device differs from the known one in that the first output of the programmer through a controlled recalculated device and circuit is anti-coincident and connected to the subtractive input of the reversible counter, and the second output through the reversible decimal counter with the first installation input of the first trigger -v. with the input of the controlled scaling device, another input of which is connected to the input of the reversible decimal counter, through the second coincidence circuit with the anti-coincidence circuit and through the third

the coincidence circuit — with a pulse generator and with the first input of the fourth coincidence circuit, the output of which is connected to the subtracting input of the reversible counter, the second INPUT - with the zero output of the first trigger, and

the third is with the input of the first coincidence circuit, through the AND circuit with the input of the second coincidence circuit, and through the differentiating chain with the second installation input of the first trigger, whose single output is connected to the third coincidence circuit.

In the proposed device, the most commonly used fixed tolerance values for deviation (for example, 5, 10, 15, 20%) are set as conditional sequence numbers, which are then automatically calculated by the absolute values of the tolerance. This way of setting the tolerance does not require first calculating the absolute value of the latter and

allows you to set it regardless of the specific nominal values of the duration of the monitored internals or pulses. In addition, setting a single digit tolerance significantly reduces the amount of information to be set and the capacity of the storage device used to store the measurement program.

The functional diagram of the proposed device is shown in the drawing.

The device contains a false generator p /, triggers 2, 3, circuit "And 4, reversible decimal counter 6, controlled scaling device 6, reversible counter 7, coincidence circuits 8-11 anti-coincidence circuit J2, programmer 13, analyzer 14, differentiating chain 15 and key 16.

Before each of the rectangular pulses, the duration of which is to be checked, triggers 2, 3 n reversing counter 7 is set to zero. Then, from the programmer 13, the reversible decimal counter 5 brings the code of the number associated with the task of nominal duration H "by the ratio Na f Til, where f is the frequency of the pulse clock of the reference oscillator /. At the moment of entering the 17 np of the mono-impulse Tx at the input, thanks to the differentiating chain 15, the trigger 2 is set to one.

The clock pulses of the generator pass through the coincidence circuit 8 and subtract one by one from the contents of the reversible decimal counter 5. They arrive at the input of the reversible decimal counter until those values go to zero. From the zero state of the reversible decimal counter, trigger 2 returns to its initial state "zero. Thus, the duration of stay of the trigger 2 in the state of "one is equal to Ti, and the number of clock pulses, which provide the output of the coincidence circuit 8, is equal to.

The controlled tracking device 6 consists of coincidence circuits that are controlled by the triggers of the reversible decimal counter 5 and the code for the number K specified from programmer 13. The number K means the specified maximum allowable relative deviation of the pulse duration Tx from the nominal value T ,,. Depending on the code K coming from the programmer’s code, every fifth, tenth or twentieth clock pulse from a number, respectively, is output at the output of the controlled counting device 6. coming from the coincidence circuit 8.

The number of pulses at the output of the controlled scaling device 6 is / (. Where K takes one of the values 0.05; 0.1; 0.15; 0.2.

If it is necessary to obtain an arbitrary conversion factor, a frequency divider can be used as a controlled recalculation device.

Using the co-ownership schemes 9-11, the anti-matching scheme 12 and the reversing counter 7

the number of K / Hz pulses is calculated from which the number of clock pulses produced during the mismatch period Tx and Ta, equal to - Tc, is then subtracted. If during the counting process, the contents of counter 7 goes to zero, this is a sign of inequality - Hz / (f G "or 1T - T" | K Ta, indicating a non-tolerable deviation of the duration of the monitored pulse Tu from the specified nominal value T ". detecting that the contents of counter 7 are equal to zero, analyzer 14 is used.

If the object of control is the interval

time between two pointed pulses, the key 16 must be closed. In addition, the start pulse, which determines the origin of the interval, is fed to input 18, and the ending pulse to input 19.

Thus, the time interval with the trigger trigger 3 is converted into a square pulse, the duration of which is controlled in the previous way.

Subject invention

A device for monitoring the deviation of the pulse duration from the specified nominal values, comprising a programmer, a reversible decimal counter, a matching circuit,

anti-coincidence circuit, triggers, pulse generator, key, differentiating chain, AND circuit and controllable sherescaler device, the output of which is connected to the summing input of a reversible pulse counter connected to the analyzer through the first coincidence circuit, in order to provide a valid deviating irrespective of the nominal value, the first output of the programmer is connected to the current input of the reversible counter through a controlled counting device and the anti-coincidence circuit, and the second to output through reversible decimal counter - with the first installation input of the first trigger and with

the input of a controlled scaling device, another input of which is connected to the input of a reversible decimal counter, via a second coincidence circuit - with an anti-sweep circuit and through a third coincidence circuit - with a pulse generator and with the first input of a fourth coincidence circuit, the output of which is connected to the subtracting input of a reversible counter , the second input - with zero output of the first trigger, and the third - with the input of the first circuit

through the key with the second trigger, through the AND circuit with the input of the second coincidence circuit, and through the differentiating chain — with the second setup input of the first trigger, whose single output

connected to a third coincidence circuit.