SU1308981A1 - Device for measuring period - Google Patents

Abstract

The invention relates to the field of electrical measurements and can be used in systems of automatic control, control and regulation. The value of the invention — the extension of the measurement range is achieved by increasing the maximum measured period and the possibility of recording both negative and positive order of measurement results. To do this, an OR-NOT 7 element, a counter 4, a second element AND 12, a second trigger 9, a second element AND-OR 6, and a group of 14 elements I are added to the device. In addition, the device contains an exemplary frequency generator 1, the elements OR 2, 3, element AND-OR 5, first trigger 8, switch 10, element 11, counter 13 mantissa, counter 15 on the order. 1 il. (With co oo o 00

Description

The invention relates to measuring technics and can be used in systems of automatic control, control and regulation.

The purpose of the invention is to expand the measurement range by increasing the maximum, the measurement period and the possibility of fixing both the negative and the positive order of the measurement results.

The drawing shows a block diagram of the device.

A device for measuring a period contains a generator of 1 exemplary frequency, elements OR 2 and 3, counter 4, elements AND-OR 5 and 6, element OR-NOT 7, triggers 8 and 9, switch 10, elements 11 and 12, counter 13 mantissa , a group of 14 elements And, a 15 order counter,

The exemplary frequency generator 1 is connected to the input of the counter 4, the outputs of which are connected to the information inputs of the switch 10, the output of which is connected to the input of the counter 13 of the mantissa, the outputs of which are the first outputs of the device and the output of the last discharge of the counter 13 of the rings 13 Issa connected to the fourth entrance

element AND-OR 6 and the first input element 30 input measured period Tdx At the point of SHSh 2, the output of which is connected through the switch 10 is allowed to the sixth input of the AND-OR element 5. Transmit pulses from the output of counter 4 to the input of counter 13 mantissa. If during time T the most significant bit of the counter 13 of the mantissa is set to one (i.e., the specified accuracy is reached), then at the sixth input of the AND-OR element 5, through the element 2 OR, the resolution of which is connected to the output of the - 40 potential for passing the AND-OR 5, the fourth input of which is the input frequency pulse with the inlet input of the AND-OR element 5 is connected to the second input of the AND 11 element and is the first to enter the device, the second input of the AND- element OR 5 is the second input of the device, the fifth input of the element AND-OR 5 It is connected to the D-input and the inverse output of the trigger 8, Sgo is connected to the first input of the element AND 12, to the second input of the element AND-OR bis to the output of the element 11, the first input of which is connected to the direct output of the trigger 8 and the switch 10 and the third input of the element AND-OR 5, the address inputs of the switch 10 are connected to the outputs of the group 14 of the elements AND, the control input of which is connected to the inverse output of the trigger 9 and to the first input of the element 6 AND-OR, K-output of the counter 15 the order is connected to the inputs of a group of 14 elements AND, with the inputs of the element OR- E 7 and the second inputs of OR 2 and the outputs are second device output (K + 1) -th discharge counter 15 is connected to the order

the first input of the OR 3 element, the second input of which is the third input of the device, and the output is connected to the R inputs of the flip-flops 8 and 9 and the counter mantissa 13 and about 15, the output of the OR-NOT element 7 is connected to the second input of the AND 12 element The output of which is connected to the S-input of the trigger 9, the direct output of which is the third output of the device and connected to the third input of the AND-OR element 6, the output of which is connected to the C-input of the 15 order counter.

The device works as follows.

After the pulse device has arrived at the third input of the device. Resetting the triggers 8 and 9, the counters of the mantissa 13 and about 15 are reset. In this case, the passage of pulses received when the frequency counter of the frequency generator 1 of the reference frequency is divided by the counter 4 through the switch 10 to the input of the counter 13 of the mantissa is prohibited. If there is a Start signal at the second input of the device and when an input frequency pulse arrives at the first input of the device, the trigger 8 switches to one state, i.e. forms

50

the course of the element And 11, which leads the device to its original state.

If during the time Td at the last output of the counter 13 of the mantissa the resolving potential does not appear (i.e.

TWU T. then the second input overflow;

Noah pulse through the element And 12 sets the trigger 9 in one state and through the element AND-OR 6 is entered in the counter 15 order. The unit at the third output of the device. The sign indicates that the received value of 5 is negative. Further, the measurement cycle continues until a resolving potential appears at the last output of the counter 13 of the mantissa (i.e., the prescribed accuracy is 3031308981

chickpea tit), which allows the passage of the next input pulse for resetting the trigger state 8. In this case, the measured period is determined by the formula

gr K min K,

Lbv

where K,

TO

pore

Pore

counter code 13 mantissa after completion of the measurement,

15 counter code after completion of measurement.

If the period of the input pulses is longer than the overflow time of the counter 13 mantissa by the pulses of the generator 1 of the reference frequency Tgj), then the overflow pulse from the higher bit of the counter 13 of the mantissa through the AND-OR element 6 (trigger 9 is in the zero state) is fed to the counter 15 order and increases its contents by one. The code from the counter outputs of the 15th order through a group of 14 elements AND (at whose control input the enabling potential from the output of the trigger 9 is set) goes to the address inputs of the switch 10 and switches

an

counters / res (f

/ i. -Atli

the frequency of filling f ka 13 of the mantissa., exactly the frequency of the pulses of the reference frequency generator 1; N (v - counter code 15

The key of the mantissa is connected to the first input of the first element OR, the first and second inputs of the first AND-INR element are respectively the first and second inputs of the device, the output of the first AND-OR element is connected to the C input of the first trigger, the direct output of which connected to the control input of the switch, characterized in that, in order to extend the range of measurements, an OR-NOT counter element, a second element AND a second trigger, a second AND-IL element and a group of AND elements are entered into it, the generator frequency of the reference frequency Connect to the C input of the meter The outputs of which are connected to the information inputs of the switch, whose address inputs are connected to the outputs of a group of elements AND whose inputs are connected to the second inputs of the first OR element, to the inputs of the OR-NOT element and to the K-outputs of the order counter, which are the second outputs the device, the control input of the AND group of elements is connected to the inverse output of the second trigger and the first input of the second AND-OR element, the output of which is connected to the C input of the order counter, the output of the (K + 1) th digit of the counter, is connected to the first the entrance of the second email OR, the second input of which is the third input of the device, and the output is connected to the R input

order) according to the established code 35 and the mantissa counters and the order and

15 pds counter. Further, the cycle repeats until the next pulse of the input frequency arrives, which through element 11 11 sets TRI1 ger 8 to the initial state. In this case, the mantissa code is set at the outputs of the counter 13, the code of the order of the output of the counter 15, and the third output of the device has a zero potential, meaning that the order of the number is positive.

Claims (1)

Invention Formula A period measurement device comprising an exemplary frequency generator, a first OR element, an AND-OR element, a trigger, an AND element, as well as a mantissa counter and an order counter, a second OR element and a switch, the output of which is connected to the C-input of the mantissa counter, outputs which are the first outputs of the device, the output of the last discharge account five 0 five 0 The mantissa chick is connected to the first input of the first OR element, the first and second inputs of the first INR element are respectively the first and second inputs of the device, the output of the first AND-OR element is connected to the C input of the first trigger, the forward output of which is connected to the control input switch, characterized in that, in order to expand the measurement range, an OR-NOT element, a second AND element, a second trigger, a second AND-OR element, and a group of AND elements are introduced into it, the output frequency entrance from An ethernet whose outputs are connected to the information inputs of the switch, the address inputs of which are connected to the outputs of the group of elements AND whose inputs are connected to the second inputs of the first OR element, to the inputs of the OR-NOT element and to the K-outputs of the order counter, which are the second outputs of the device , the control input of the AND group of elements is connected to the inverse output of the second trigger and the first input of the second AND-OR element, the output of which is connected to the C input of the order counter, the output of the (K + 1) th digit of the counter, is connected to the first input a second OR gate, whose second input is the third input device and an output coupled to the R-vhoda0 the first and second triggers, the direct output of the first trigger is connected to the third input of the first AND-OR element and the first input of the first AND element, the second input of which is connected to the first input of the device, and the output to the fourth input of the first AND-OR element, the first input of the second element AND to the second input of the second element AND-OR, the fifth input of the first element AND-OR is connected to the D input and the inverse output of the first trigger, the second input of the second AND element is connected to the output of the OR-NOT element, and the output is from S-input of the second trigger, direct output of which It is the third output of the device and is connected to the third input of the second AND-OR element, the fourth input of which is connected to the output of the last bit of the mantissa counter, the output of the first OR element, is connected to the sixth input of the first AND-OR element. 0 five