SU1213534A1 - Tolerance checking device - Google Patents

Abstract

The invention relates to the field of pulsed technology and can be used in the construction of input signal analyzers. The purpose of the invention is to expand the field of application of the device by providing control over a wide frequency range and ensuring prompt change in the average value of the tolerance field in the control process. The device comprises a reference frequency generator 1, drivers 2, 3 and 4, decoders 5 and 8, a code setting block 6, a reversible counter 7, elements 9 AND, element 10 OR, and a block 11 of forming a sign including triggers 13, 14, 15 and 17 and element 16 I. When changing the range of monitored frequencies, the device provides a constant value of errors due to the absence of the possibility of changing the pulse frequency from the output of the reference frequency generator 1. 2 Il. (L // 1C 00 ate with t Vffffia

Description

one

The invention relates to a pulse technique and can be used in the construction of input signal analyzers.

The purpose of the invention is to expand the field of application of the device by providing the ability to control over a wide frequency range and to ensure prompt change in the average value of the tolerance field in the monitoring process.

FIG. 1 shows the scheme of arrangement of tolerance control; on . 2 - the functional circuit of the third shaper.

The tolerance control device contains the reference frequency generator 1, the first driver 2, the output of which is connected to the output of the second driver 3, and the control inputs of the third driver 4 are connected to the inputs of the additional decoder 5 and the code setting unit 6, the outputs of which are connected to the information inputs of the reverse the counter 7, the outputs connected to the inputs of the decoders 8, the outputs of which are connected through the elements AND 9 to the inputs of the element OR 10, and the output of the first shaper 2 is connected to the first input of the forming unit 11 the second input is connected to the output of the second imaging unit 3, and the third input is connected to the output of the OR element, control buses 12, the sign generation unit 11 contains the first trigger 13, the inputs of which are connected to the second and third input of the sign generation unit 11 and the second input trigger 14, and the output of the first trigger 13 is connected to the first input of the third trigger 15 one of the outputs of which is connected to the first input of the element 16, the second input of which is connected to one of the inputs of the fourth trigger 17, and the outputs of the third trigger 15, ele And 16, the fourth trigger 17 is connected to the outputs of the sign generation unit 11, and the third driver 4 contains a D-trigger 18, the output connected to the And element 19, and a permanent memory unit 20, the output of which is connected to the information inputs of the counter 21, is countable the input of which is connected to the code p-triggera 18, while the first input of the reversible counter 7 is connected to the bus 22 of the monitored signal.

2135342

The device tolerance control works as follows.

The control bus 12 in binary code receives a number that uniquely defines the value of the middle tolerance field and the tolerance field boundary, i.e. determining the number of the channel, the frequency of the signal in which is to be monitored. With this level of logical

10 units from one of the outputs of the additional decoder 5 using one of the elements And 9 select the appropriate decoder from the group of decoders 8. From block 6 of the task (5 neither the code representing permanent memory, whose address inputs correspond to the inputs, and information outputs - by the outputs of block 6 for setting the code, the additional2 code entries for the reversible counter 7 receive an additional code for the numbers corresponding to the middle of the tolerance field.

Thus, the memory is constant.

25 converts the channel number code into an additional code of the number N. The value of N is determined from the expression T J

neither

NI - on fo

thirty

where T0 is the value of the measurement interval;

35

 - the frequency of the monitored signal corresponding to the middle of the tolerance field.

The measuring interval TQV, is formed using the frequency generator 1 -f and the third driver 40. The third driver 4

executes the functions of a code to time converter function. With

In this case, the formed measurement interval must satisfy the ratio 45

se

9gon4j-v- and °

OR

(one)

50

 °° - IH Oaon

„Zones

Where

ofi

five

nv

measuring interval value;

the frequency corresponding to the lower limit of the tolerance;

the tolerance is due to the lack of synchronization between the frequency of the input signal and the reference signal produced by the reference frequency generator 1.

Using the code of the channel number received via the control buses 12 to the address inputs of the permanent memory block 20 of the third generator 4, an additional code of the number N is selected, which goes to the information inputs of the counter 21, the value N

i W fot,

- ziachenie basic oftenEo .g

where {, ..,.

you generated by the generator 1.

By multiplying the last inequality (.1) by fo-t, we obtain an inequality that must be satisfied by the code of the number

fo.r om

- -100%,

.

or

R

oo

f n 8

100%

With a pulse coming from the output of the generator 1 of the reference frequency and the counting input trigger 18 of the third driver 4, this trigger is set to a single state. A positive pulse difference, coming from the output of the D-trigger 18 to the synchronization input of the counter 21, records the code coming from the outputs of the fixed memory unit 20 into the counter 21. The level of the logical unit coming from the output of the D-trigger 18 to one of the the inputs of the logic element AND 19, the passage of pulses from the output of the reference frequency generator 1 through this element to the counting input of the counter 21 is permitted. The counter operates in the addition mode. At the moment of overflow of the counter 21, an impulse appears at its output, which resets the 1) trigger 18.

Thus, at the output of the D-trigger 18, a pulse is formed, the strength of which is determined by the incoming signal through the control code 12.

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The operation of the sign generation unit 11 is similar to the operation of the known device unit 2.

The signals in the form of electrical oscillations, the frequency fy of which is to be monitored, are sent to the counting input of the reversible counter 7. Signals from the output of the third driver 4, duration T, “are fed to the input

10 of the first former 2. The latter generates short rectangular pulses with a period of following TQ. The pulse that appears at the output of the first driver 2 at some momeite

15 time, arrives at the installation input of the reversible counter 7 and at the counting inputs of the flip-flops 15 and 17 of the sign-forming unit 11. At the same time the reversive counter 7, working

20 in the addition mode, is set to the initial state, the triggers 15 and 17 are in the state corresponding to the state of the triggers 13 and 14. The falling edge of the pulse produced by the 25 BTopbiM driver 4, the triggers 13 and 14 of the sign forming unit 11 are set to the zero state. At the same time, this pulse records the code from the outputs of the block 6 for setting the code to the reversing

thirty

40

5 55

45

counter 7.

At the end of the pulse, the reversible counter 7 is transferred to the pulse counting mode of the monitored signal of the frequency I c, arriving at its counting input. Each decipher 8 is configured with an additional code corresponding to its trigger threshold. In the process of counting pulses of a controlled frequency with a reversible counter 7, decanters 8 successively select a number of code combinations and form pulses at the output. The impulse to the input of the logic element OR 10 comes from the corresponding decipher: through an open, push-pull signal from the output of decipher 5,. The chests element is C 9. Thus, the first pulse generated by the selected decoder 8 corresponds to the lower trigger threshold 1. In this case, the trigger 13 of the sign-forming unit I1 is set to one state, and the trigger 14 does not change its state, since, until the moment of the appearance of a given pulse, its control input is in-

stupid zero signal from the output of the trigger 13.

At the moment of overflow of the reversible counter 7, the latter translates into subtraction mode. If such a number of pulses arrives at its counting input before the appearance of the second pulse Q of the output of the first driver 2, the pulse is formed again at the output of the requesting decoder, it corresponds to the upper threshold and is fixed in the sign generation unit 11. In this case, the trigger 14 of the sign-forming unit 11 is set to one state, since its control-input receives a single signal from the trigger of the trigger 13.

So, if controlled

the frequency fv turns out to be the upper, tg threshold

the appearance of the second pulse at the output of the first generator 2, the interrogated decoder 8 generates two pulses that switch the triggers 13 and 14 into a single state. The second impulse from the output of the imaging unit 2, arriving at the counting inputs of the flip-flops 15 and 17 of the sign-forming unit 11, will also set the latter in a single state. At THIS, the signal appearing on the trigger trigger 17 corresponds to the More result.

If the frequency of the monitored signal is within the specified thresholds tfe, then the decoder 8 will generate only one pulse that switches trigger one to 13. Then the second pulse .c from the first: shaper 2 sets trigger 15 to 1, and trigger 17 to zero state. The signal appearing on the output of the logic element AND 16 corresponds to the result of the comparison Norm.

.

If f x is less than f, the decoder 8 does not generate a single pulse until the second pulse appears at the output of the driver 2. The trigger 13 and the trigger 14 of the sign forming unit 11 remain in the initial state in this case, after the appearance of the second pulse at the output, trigger 2 triggers 15 and 17 will also be in the zero state. The signal that appears at the output is 10 15

20

25 so

j ds

50

55

15, corresponds to the result of the Comparison Less.

If it is necessary to promptly change the average value of the tolerance field and the tolerance limits, it is sufficient to change the code supplied to the control buses 12 accordingly. With the help of an additional decoder 5 and the corresponding AND 9 logical element, the necessary decoder from the decoder group 8 is selected, the code is changed supplied from the outputs of block 6 of the task code will produce a corresponding change in the value of the measuring interval TQ using the third shaper 1. The known device It does not allow such an operational change in the average tolerance floor and the tolerance limits.

In addition, when changing the range of monitored frequencies, the known device does not provide a constant value of the error, which is due to the inability to change the pulse frequency from the output of the reference frequency generator 1.

Claims (1)

Invention Formula A tolerance control device containing control buses, a reference frequency generator, a reversible counter, the first input of which is connected to the bus of the monitored signal, information inputs connected to the outputs of the code setting unit, and the second input connected to the output of the first driver, the second driver's input and the first input of the block the formation of the sign, the three outputs of which are connected to the output tires, and the second input is connected to the output of the second driver and the third input of the reversible counter, the outputs of which are connected to the input s respective decoders, the outputs of which through- corresponding elements. And combined with the corresponding inputs of the OR element, the output of which is connected to the third input of the sign-forming unit, characterized in that, in order to expand its area of application by providing controllability in a wide frequency range n (providing an operative change in the average value of pbl in the control process, a third driver and an additional decoder are entered into it, with the inputs of the additional decoder, the control inputs of the third driver and the code setting block inputs connected to the corresponding control buses, the third driver input is connected to the output of the reference frequency generator, and the output is with the input of the first shaper, while the outputs of the additional decoder are connected to the second inputs of the elements I. I am a generator / Iprayo To formobatalu (block 2) Figure 2 Compiled by N. Markin Editor H ,, Gunko Texpeg; m.j (5 CTeJie Bji4 ° PP5 1 °: „Г„. 786/61 Circulation 813 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab. A / 5 Branch PGS Patent, Uzhgorod, Project 4 street