SU448427A1 - Device for measuring the varying period of low-frequency oscillations with the result tied to time - Google Patents

Description

one

The invention relates to electrical measuring equipment and can be used to improve the accuracy of measuring a varying period of low frequency oscillations.

A device is known for measuring a variable period of low-frequency oscillations with reference to the result over time, containing a shaper of a measured time interval, a first delay line, whose input is connected to the first input of the selector, with anti-phase outputs connected to the potential inputs of two circuits "And, the output of the first circuit" And it is connected through the second delay line to the first input of the OR circuit, and the output of the second AND circuit is directly to the second input of the OR circuit, the pulse counter of the reference frequency during the measuring and Tervala which outputs are connected through circuits census to the memory, and the measuring time counter with its output connected to the census schemes.

The proposed device differs from the known ones in that the first delay line is made with four pins and is provided with a measurement time register, the inputs of which “Setting 1 bit cells are connected via census circuits to the outputs of the measurement time counter cells,” the storage device, and the counting input of the low-order cell with the output of the low-order cell of the measurement time counter. The counting input of the latter is connected to the output.

the circuit "OR and the counting input of the pulse counter of the reference frequency, the input" Installation About which is connected to the input "Installation O of the measurement time register and the second output of the first delay line. First conclusion

This delay line is connected to the pulse inputs of the pulse counter census circuits of the reference frequency and the measurement time register, the third with the pulse inputs of the census patterns of the measurement time counter, and the fourth with the second selector input, the first input connected to the output of the measuring interval. Pulse inputs of the first and second circuits “And connected to the output of the pulse generator of the reference frequency.

Such an embodiment of the device improves its accuracy.

The block diagram of the device shown in the drawing.

The device consists of Ez shaper 1 pulses of the measured time interval, the generator 2 pulses of the reference frequency, the selector 3, the first 4 and second 5 delay lines, the first 6 and second 7 circuits "And, the circuit" OR 8, the counter 9 pulses of the reference frequency for

time interval, census schemes 10

the counter 9, the counter 11 of measurement time, the circuits 12 of the census of counter 11, the register 13 of measurement time, the registers 14 of the register 13 and the memory 15.

The device works as follows.

The input signal of the frequency F (t) is fed to the input of the pulse generator 1, the interval between which (measured interval) is equal to the integer number of quasi-periods of the input signal -K the beginning of the measurement cycle, the selector 3 is in 3 states, in which the circuit 6 is closed and the circuit 7 is open. In this case, the pulses of the reference frequency pass through circuits 7 and 8 to the counting inputs of counters 9 and 11.

The impulse of the dimensional interval arrives at the first input of the selector 3 and transfers it to the state where the circuit b is open and circuit 7 is closed. The reference pulse that came after this passes through circuit b, delay line 5, and circuit 8 to the inputs of counters 9 and I.

At the same time, the pulse of the measuring interval is fed to the input of the delay line 4, at the four outputs of which four pulses are successively generated delayed relative to the pulse of the measuring interval for time intervals.

The first delayed pulse is fed to the pulse inputs of census circuits 10 and 14 and removes and rewrites the readings of counter 9 and register 13 into memory 15. The second delayed pulse passes to the inputs “Setting 0 of counter 9 and register 13 and resets their readings to zero. The third delayed pulse enters the pulse inputs of census schemes 12 and extracts and rewrites the meter readings and the measurement time into the register 13. The fourth delayed pulse arrives at the second input of the selector and transfers it to the previous steady state in which circuit 6 is closed and 7 is open.

This completes the measurement cycle.

In the storage device 15, the number L of reference pulses counted by the counter 9 is recorded for the nth dimensional interval, which determines the duration of the dimensional interval

p-1

N

TP and the number of S 1. defining

i 02

time of the middle of the dimensional interval. This is due to the fact that in the process of operation the pulses from the output of the low-order cell of the counter 11 are fed to the counting input of the lower-order cell of the register 13, as a result of which the register summarizes every second reference

impulse with rewritten into it at the end of the previous measurement cycle from counter 11 ncp-1 impulses scrap

and.

n is the sequence number of this cycle

measurements;

Ni is the number of reference pulses during the t-th measurement cycle.

The subject matter of the invention

A device for measuring the varying period of low-frequency oscillations with reference to the result over time, containing a shaper of a measured time interval, a first delay line, whose input is connected to the first input of the selector, with anti-phase outputs connected to the potential inputs of two circuits is connected via the second delay line with the first input of the OR circuit, and the output of the second AND circuit is directly with the second input of the OR circuit, the pulse counter of the reference frequency during the measuring interval A, the outputs of which are connected to a memory through census schemes, and a measurement time counter with census schemes connected to its output, characterized in that, in order to improve accuracy, the first delay line in it is made with four pins, and it is provided with a measurement time register, The inputs “Setting 1 bit cells of which are connected via census circuits to the outputs of the cells of the measuring time counter, the outputs via census circuits to the inputs of the storage device, and the counting input of the low-order cells to output om cell

the least significant bit of the measurement time counter, the counting input of which is connected with the output of the OR circuit and the counting input of the pulse counter of the reference frequency, the input "Installation About which is connected to the input" Installation O

the measurement time register and the second output of the first delay line, the first output of which is connected to the pulse inputs of the pulse counter census circuits of the reference frequency and the measurement time register, the third -

with the pulse inputs of the census patterns of the measurement time counter, and the fourth with the second input of the selector, the first input of the measuring interval connected to the output of the meter, and the pulse inputs

the first and second circuits "And connected to the output of the pulse generator reference frequency