SU1068830A2 - Device for measuring frequency change rate - Google Patents

Abstract

DEVICE FOR MEASURING THE SPEED CHANGE OF FREQUENCY ON AUTH. 728089, characterized in that, for the purpose of measuring accuracy, a third meter and a third meter are connected in series with a second input, the second input of which is connected to the output of the readout unit, while the output of the third counter is connected to the output of an additional pulse counter and with the first input The third key, the second input of which is connected to the output of the reference frequency generator. (L 9 (x) eo so about

Description

The invention relates to automation and measurement technology, in particular to automatic devices designed to monitor and measure the rate of change of frequency, and can be used in conjunction with frequency sensors to study physical parameters in transient conditions.

It is known a device for measuring the rate of change in frequency, comprising a series of connected input matching unit, a pulse shaper and a main key, a result counter connected to the read and return unit, a frequency generator, two keys and two pulse counters, and the output of the generator is frequency is connected to the counting input of the first additional pulse counter and the first input of the first additional key, the output of which is connected to the counting input of the second additional counter and pulses, installation inputs of additional pulse counters are connected to the output of the 1-pulse generator, input of the read and return unit to the outputs of the first additional counter and the main key, the output of the second additional pulse counter is connected to the control inputs of the main and first additional keys and the first input of the second additional key, the output of which is connected to the counting input of the result counter, the output of which is connected to the control input of the second additional key l.

A disadvantage of the known device is low measurement accuracy.

The purpose of the invention is to improve the accuracy of measuring the rate of change of frequency.

The goal is achieved by the fact that a third key and a third counter connected in series are inputted to a device for measuring the rate of change of frequency, the second input of which is connected to the output of the readout unit, while the output of the third counter is connected to the output of an additional pulse counter the second input of which is connected to the output of the reference frequency generator.

The drawing shows a functional diagram of the proposed device.

The device contains serially connected input matching unit 1 and driver 2 pulses, result counter 3, additional counters 4 and 5 pulses, keys 6-8, reference frequency generator 9, the output of which is connected to the inputs of key 7 and additional counter 4, block 10 of reading and return, the input of which is connected to the output of the key 7 and the output of the additional counter 4, the third additional counter And the third additional key 12, the Capacity of the third additional counter 11 pulses equal to the capacity of the counter 5, i.e. proportional to the frequency period F of the first setpoint.

The device works as follows.

In standby mode, the third additional key 12 is closed. Upon reaching the controlled frequency of the first commissioning value, the counter 5 is replicated, while the keys 7 and B are closed, and the key 12 is opened, and until the end of the controlled frequency period, the counter 6 is filled with pulses from the generator 9. The arrival of the next pulse from the generator 2 returns counter 5 in

the zero state, and the key 12 is closed before the new overflow of the counter 5. If the counter b is overflowed, an additional counting pulse is applied to the counter 3 of the result.

; When the controlled frequency reaches the second setpoint value, the counter 4 overflows, which causes the block 10 to operate. At the same time, the number recorded in the counter 3 is read, and the counters 3 and 11 return to the zero state.

, At this point in the counter 3 bu35 the number is written

 ,

where n is the number of overflows of the counter 5;

n is the number of overflows of the counter, 0 ka 11, whose capacity is equal to the capacity of the counter 5, As a result, the time interval t,. for which the frequency change occurred, will be represented by the number of periods of constant periods of duration T

i-nT, .r (T.-TJ (r..n) T / yT.

50 Number N characterizes the rate of frequency change.

,

AND

N

where F is the frequency of the setpoint; , p2 - frequency of the second setting; T - the duration of the period. At the same time, the result of measuring the rate of change of frequency, curved by the number N, does not depend on the order of change of frequency (or period) in the controlled range.

The third additional counter 1- can be performed, for example, in

E1068830

the form of a binary-decimal counter will increase the accuracy of

Used as an extra measure.

of the least significant bits of the counter 3 dL Thus the proposed

registration of the fractional part of the remultiplier allows to increase the accuracy

ta measurement, 4to dope measurement of the rate of change of frequency.

Claims (1)

DEVICE FOR MEASURING SPEED OF CHANGE OF FREQUENCY BUT avt.sv. No. 728089, characterized in that, in order to improve the accuracy of measurement, a third key and a third counter are introduced in series with it, the second input of which is connected to the output of the reading unit, while the output of the third counter is connected to the output of the additional pulse counter and to the first, input the third nag, the second input of which is connected to the output of the reference frequency generator.