SU1221607A1 - Arrangement for tolerance inspection of pulse repetition frequency - Google Patents

Abstract

This invention relates to a pulsed and computational technique. The purpose of the invention is to increase the functionality. device capabilities. The device contains sensors 1 and 2 frequencies, each of which includes circuits 3 and 4 AND and one-shot 5 and 6. In addition, the device contains a script 7 AND-OR, a circuit 8 AND-NOT, RS-flip-flop. 9, the input 10 controlled frequency and the input 11 of the initial installation of the device. The description of the options for the operation of the device for cases where the monitored frequency is within the permissible limits and beyond the permissible limits. Time diagrams are presented that show how the device works. 2 Il. V С

Description

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The invention relates to a pulsed and computing technique.

The purpose of the invention is to expand the functionality of the device,

FIG. 1 shows a functional diagram of the proposed device; in fig. 2 a, b, c - timing diagrams that explain the principle of operation.

The device contains two frequency sensors 1 and 2, consisting of two circuits AND 3 and 4 and two double-output vibrators 5 and 6 each, an AND-OR 7 circuit, an AND-HE circuit 8, an RS flip-flop 9, a controlled frequency input 10 and an initial device installation 11. The outputs of the first AND 3 circuits are connected to the inputs of the first single vibrators 5, the inverse outputs of which are connected to the inputs of the first AND 3 circuits and the inputs of the AND-OR circuit 7, and the direct outputs of the first single vibrators 5 are connected to the inputs of the second AND 4 circuits the outputs of which are connected to the first inputs of the second one of the vibrators 6, the direct inputs of which are connected to moves the first AND circuits and the inverted 3 - to the inputs of the second AND circuits 4 and input OR-AND circuit 7, the output of which is connected to a first input of AND-NO skhmy 8 ,. at the same time the system inputs

AND-OR 7 is also connected to the direct outputs of the one-vibrators 5 and 6 of the second frequency sensor 2, the input of the controlled frequency 10 of the device is connected to the inputs of the AND circuits, the input of the initial installation 11 of the device is connected to the inputs of the And circuits 6, the second inputs of the second single-vibrators 6, the second the input of the circuit is AND-HE 8 and the R-BXo-t house of the trigger 9, the S-input of which is connected to the output of the circuit IS-HE 8, and the output is the output of the device.

The device works as follows.

A negative polarity impulse arriving at the input of the initial setup of the device 11, goes to the R input of the RS flip-flop 9, sets it to the zero state, And 3 and 4 circuits, sets the low voltage levels on their outputs, - NO 8, prohibiting installation of the trigger 9 via the S-input, and to the second inputs of the one-shot 6, On the positive edge of the installation pulse one-frequency 6 of frequency sensor 1 generates a pulse of duration LI at the outputs, and on the negative edge of the setting pulse one-shot 6

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Frequency sensor 2 generates a pulse with duration -, |. .

The duration of the pulses generated by the single vibrators 5 and 6 of the sensor

. frequency 1 is selected from the ratio

lt

t-ui - to

 , -D1 „,

where T is the period of the controlled frequency

t is the delay time of the circuits And 3 and 4 of the frequency sensor 1, d t is the maximum allowable lower frequency deviation. The duration of the pulses generated by the single vibrators 5 and 6 of the frequency sensor 2, is chosen from the ratio

 Tk-ag-ygv

where LJJ is the delay time of the And 3 and 4 frequency sensor delay circuits 2, fli-g, is the maximum allowable

upper frequency deviation

For stable operation of the device at the initial moment of time, the duration of the pulse of the initial installation is chosen equal to 1.

If the controlled frequency is within acceptable limits, then the pulses arriving at the input 10 of the device will alternately start one-shot 5 and 6 frequency sensors 1 and 2 (Fig. 2 a). As a result, the output level of the AND-OR 7 circuit will be low.

If the controlled frequency is below the permissible limit, then at the moment of time. T the frequency controlled pulse will enter the device input when both single vibrators 5 and 6 of frequency sensor 1 are in the zero state and, therefore, prohibit its passage through AND circuits 3 and 4 (Fig. 2 b). In this case, at the output of the I-IPI 7 circuit, the high voltage level causes the low voltage level signal on the S-input of the trigger 9, which sets the high voltage level at the output of the trigger 9 and signals the output of the monitored frequency beyond admission.

If the value of the monitored frequency is higher than the allowable limit, then at time tj, a pulse of the monitored frequency is fed to the input 10 of the device when both single-oscillators 5 and 6 of the frequency sensor 2

are in the pulse shaping mode and, therefore, prohibit the passage of a controlled frequency pulse through the AND 3 and 4 circuits (Fig. 2b). In this case, the output of the AND-OR circuit also exhibits a high voltage level, which sets the output of the trigger 9 high voltage level.

Claims (1)

Invention Formula The device for the tolerance control of the pulse frequency, containing the logical element AND-NOT, RS is a trigger, two frequency sensors, is composed of two logical elements AND and two single-vibrators each, which is due to the fact that , an AND-OR logic element is entered into it, the output of which is connected to the first input of the NAND logic element, and the output of the NAND logic element is connected to the RS-trigger trigger input, the reset input of the RS flip-flop is connected to the second input of the AND logic element NOT ONE them all of the inputs of the AND gates of the first and second speed sensors, and with the second input of the second monostable multivibrator and is input to the initial installation of the device, the input frequency of the controlled device is connected to one input of AND gates and to one input of the third circuit the matches of the AND-OR element, the outputs of the first and second logic elements And in both frequency sensors are connected respectively to the inputs of the first and second inputs of the second one-oscillators, and the inverse outputs of the first and second one-frequency of the first frequency sensor are connected respectively to the inputs of the first and 0 of the second logical element AND with the inputs of the first circuit of the coincidence of the logical element AND-OR, and the inverse outputs of the first and second single-oscillators of the second sensor of the frequency of the co- 5 dineny respectively with the inputs of the first and second logical elements And with the inputs of the second circuit from the top of the logical element AND-OR, while in the first frequency sensor direct 0 my output of the first one-oscillator is connected to one of the inputs of the second logical element And, and my output of the second one-shot is with one of the inputs of the first logic element 5 And, in the second frequency sensor, the direct output of the first single vibrator is connected to one of the inputs of the second logic element I and to one of the inputs of the third matching circuit of the logical The Q element is AND-OR, and the direct output of the second one-oscillator is connected to one of the inputs of the first logical element AND and to one of the inputs of the third matching circuit of the logical element AND-OR, the output of the device is the output K5, - a trigger. and ITJ fff JalJ J J JlJ JlJTJglglgl