SU468178A1 - Pulse Frequency Monitor - Google Patents

Description

(54) DEVICE FOR CONTROLLING THE FREQUENCY OF PULSES

The invention relates to a discrete AB: theme and can be used in devices for monitoring the frequency of pulses by counting pulses of the measured frequency over a reference time interval. Known devices for monitoring pulse frequencies containing a counter controlled by a decoder whose inputs are connected to the counter outputs are triggers. and logic elements, for solving the problem of definitenen, whether the measured frequency is within the allowed tolerances is unnecessarily cumbersome and unreliable, since they require the use of several good counters and lots of triggers and. logical elements.

Pel invention - simplifying and improving the reliability of the device,

This is achieved by the fact that the device is equipped with a delay circuit, the first output of the J-direction of its decoder is connected to the unit: the trigger input, which has zero zero through the OR circuit connected to the second output of the decoder connected to the other trigger input, the outputs of both triggers are connected analyzer inputs, the polling input of which is connected to the output; And circuits connected via a delay circuit with a counter input to the other; the input of the OR circuit and the zero input of the second trigger, and the inputs of the specified AND circuit are connected to the reference pulse supply bus and to the 11th output of the trigger with a counting input.

The drawing shows a functional diagram of the proposed device for. (roll pulse frequency.,

The device contains a counter 1, the outputs of which are connected to the inputs of the controllable decoder 2, triggers 3 and 4, the outputs i, which are connected to the analyzer 5 connected by the interrogation input to the AND 6 circuit, connected through the delay circuit 7 to the i reset counter 1, with a zero trigger input 4 and through a circuit with a zero trigger input 3, counting: flip-flop 9, whose input is connected to the pulse supply frequency of the reference frequency, I circuit 10, connecting the input of the counter 1 to the pulse supply bus of a controlled frequency. The device operates as follows. In the initial state, all the triggers and the counter are in the zero state. The first pulse of the reference frequency sets the counting trigger to one state. The frequency of the reference pulses is lower than the frequency of the monitored pulses and is selected on the basis of the required measurement accuracy. The signal at the unit output of the counting trigger 9 allows the controlled frequency pulses to flow through the AND 10 circuit to the output of counter 1, the counter is filled with the controlled frequency pulses before the second reference frequency pulse arrives, setting the counting trigger 9 to the zero position. Analyzer 5, according to the signal coming to the interrogation input from the AND 6 circuit, signals the Norm signal if trigger 3 is in one, and trigger 4 is in the 1st state; Signal No norm with simultaneous signal output Above the norm - in case the trigger 3 is in zero, and the trigger 4 is in unit state; signal No norm with simultaneous signal output Below the norm - in case the triggers 3 and 4 are in the zero state. If the controlled frequency lies within the tolerances, in the process of filling the counter 1 at the first output, which determines the lower tolerance of the controlled frequency, from the controlled decoder 2 there appears a pulse arriving at the single input of the trigger 3, which sets it to one the At the time of arrival of the second pulse of the reference frequency, a signal appears at the output of the AND 6 circuit. The signal arrives at the polling input of the analyzer 5, according to which, from the analyzer 8, a signal is given. Norm The decoder 2 generates a pulse on the first output that sets trigger 3 into one state, and then pulses on the second output, determining the upper tolerance of the controlled frequency, setting trigger 3 to zero and trigger 4 in one general state.

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Wt At the time of arrival of the second pulse of the reference frequency at the output of the circuit And 6 there is a signal arriving at the survey. analyzer 5, which sends signals from the analyzer 5 to No norm and Above norm signals. If the monitored frequency lies below the lower tolerance, in the process of filling the meter 1 at the outputs of the controlled decoder 2 a pulse does not appear and the triggers 3 and 4 keep the zero state. At the moment of arrival of the second pulse of the reference lacTOTbi at the output of the circuit And, 6, a signal arrives at the polling input of the analyzer 5, according to which signals from the analyzer 5 are No norm and Below normal In all cases after the second pulse of the reference frequency arrives, the signal from the output of circuit 6 through the delay circuit 7 through time; determined by this scheme sets -triggers 3 and 4 and counter 1 to the zero state, preparing the device for the next frequency measurement. The subject of the invention. A device for controlling the frequency of pulses, comprising a counter, the outputs of which are connected to the inputs of a controlled decipher, triggers, AND and OR circuits. a pulse supply bus of a reference frequency and an analyzer, characterized in that, in order to simplify and increase reliability, it is equipped with a delay circuit, the first output of the controlled decoder is connected to a single trigger input, the zero input of which is OR connected to the second output of a controlled decoder, connected to the single input of another trigger, the outputs of both triggers are connected to the analyzer inputs, the interrogation input of which is connected to the OUTPUT of the AND circuit connected through the delay circuit with the reset input the other input of the OR circuit and the zero input of the second trigger, and the inputs of the specified AND circuit are connected to the reference frequency pulse supply bus and to the zero / trigger output with a counting input.

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