SU402817A1 - DEVICE FOR MEASURING FLUCTUATION - Google Patents

Description

one

The invention relates to the field of electrical measuring equipment and may be used to simplify the construction of frequency fluctuation meters.

A known device for measuring the fluctuation of the pulse frequency relative to the nominal value, comprising a generator of pulses of the reference frequency, an omnipresent circuit, a pulse counter, triggers, assembly and assembly circuits, and a delay line, is characterized by a complicated structure.

The proposed device differs from the known ones in that the inputs of the first and second delay lines and the first input of the first coincidence circuit are connected to the input signal bus, the second input of which connects the first trigger to the output of the first delay line, and the output to the first input of the assembly circuit whose second input is connected to the output of the second delay line and to the input of the scaling circuit, and the output to the counting input of the second flip-flop, the output of which is connected to the first input of the second coincidence circuit, the second input of which is connected to it, is generated with reference frequency -.cherez third input of the third flip-flop to output a scaling circuit, and an output - to the input of the pulse counter.

This embodiment of the device allows to simplify its design.

Figure 1 shows a block diagram of the device described.

The device consists of delay lines 1 and 2, triggers 3, 4 and 5, coincidence schemes b to 7, assembly circuit 8, generator 9 pulses of the reference frequency, scaling circuit 10 and counter 11 pulses.

The device works as follows. The input signal as a sequence of pulses is fed to the inputs of delay lines 1 and 2 and the first input of the matching circuit 6. The first pulse of the input sequence does not pass through the matching circuit 6, since the trigger 3 is in the zero state. The first pulse delayed by the delay line 1 sets the trigger 3 to the single state, as a result of which the second and all subsequent pulses pass through the coincidence circuit b and arrive at the first input of the assembly circuit 8. The delay time of the delay line 2 is chosen so that it is equal to the nominal period input signal. Therefore, the time during which the trigger 4, is in the unit state, is equal to the absolute value of the change in the period of the signal under investigation relative to the nominal value. During the time intervals when the trigger 4 is located, in the single state, the pulses from the output of the generator 9 through the coincidence circuit 7 arrive at the counter 11 of the pulse COB. The scaling circuit 10 counts the number of periods allotted for the measurement, and after overflow sets the trigger 5 to the zero state, thereby stopping the flow of pulses from the generator 9 to the counter 11.

Subject invention

A device for measuring fluctuation of the pulse frequency relative to the nominal value, comprising a reference frequency pulse generator, a scaling circuit, a pulse counter, triggers, coincidence and assembly circuits, and a delay line, in which, for the sake of simplicity, are connected to the input signal bus the inputs of the first and second delay lines and the first input of the first coincidence circuit, the second input of which is connected via the first trigger with the output of the first delay line, and the output with the first input of the assembly circuit, the second whose input is connected to the output of the second delay line and to the input of the scaling circuit, and the output to the counting input of the second trigger,

the output of which is connected to the first input of the second coincidence circuit, the second input of which is connected with the pulse generator of the reference frequency, the third input through the third trigger with the output of the scaling circuit; and the output - with the input of the pulse counter.