SU377698A1 - DIGITAL FREQUENCY - Google Patents

Description

one

The invention relates to the field of electrical measuring equipment.

Digital frequency meters are known that allow counting the measured frequency pulses in the adjacent intervals where information is lost, containing a main counter, an initial frequency counter with census chains, an additional counter and two keys.

To expand the range of measured frequencies in the proposed frequency meter, the outputs of the additional counter are connected to the corresponding installation inputs of the main counter through additional circuits of the census, the control inputs of which are connected to the outputs of the control unit.

The drawing shows a block diagram of the described frequency meter containing the main 1 and additional 2 pulse counters, keys 3 and 4, control block 5, time delay block 6, synchronizing generator 7, synchronizer 8 of measured frequency pulses, memory register 9, main 10 and additional census // chains.

The device works as follows. Input frequency pulses / h-clocked using a synchronizer with 8 pulses from the output of the synchronizing generator 7, through the key 3 arrive at the input of the main counter}. Key 4 is currently closed. Impulse with

the output of block 6, which specifies the measurement time t, starts control block 5, whose operations are synchronized by a sequence of pulses from the output of generator 7. The block generates a census pulse recorded in the main counter / information in the memory register U using census circuits 10. At the same time key and key 4 is opened. Input frequency pulses are received

to the input of the additional counter 2. i3 this time is the installation (reset) of the main counter to the initial state before the next measurement, ilo the end of the reset operation of the main

the counter 1 pulse from the output of the control unit generates a pulse of the census of the state of the additional counter through the census circuits and into the main counter. The key 4 is closed, the key 3 is opened. After that, the frequency pulses / x are fed to the input of the counter /, and the counter 2 is reset with the reset pulse from the output of the control unit 5. With the arrival of the next impulse from the exit

the time block on control block 5, the latter generates a census pulse, which can be considered as the end of the previous measurement. The formation of the reset pulse of the counter J can be considered the beginning of the next measurement.

Subject invention

A digital frequency meter containing a pulse counter, the output of which is connected to the memory register through the census circuits, an additional counter, a synchronizing hepater, the outputs of which are connected to the synchronization inputs of the control unit and the pulse synchronizer of the measured frequency, while the output of the latter is connected to the information inputs of the keys included NZ

the input of the counters, and the control inputs of the keys are connected to the outputs of the control unit, characterized in that, in order to expand the range of measured frequencies, it is equipped with additional census circuits connected between the outputs of the additional counter and the installation inputs of the main counter, while the control inputs the main and additional census circuits are connected to the outputs of the control unit.