SU1370614A1 - Device for automatic measurement of amplitude-frequency characteristic parameters of four-terminal network - Google Patents

Abstract

This invention relates to a measurement technique. The purpose of the invention is to expand the functionality by providing a measurement of the bandwidth of the amplitude-frequency characteristic (AFC) of the quadrupole at a given level. The device for automatic measurement of the quadrupole frequency response parameters contains a oscillating frequency generator 1, a start-up unit (B) 2, a command distributor 3, a four-pole 4 under study, an input signal detector 5, an electronic frequency scale generator 6, an output signal detector 7, a video detector 8, and elements 9, 10, B 11. conversion, indicator 12, comparator 13, B 14 input, elements OR 15, 20, elements 16, 19 comparison, control e I attenuator 18 and B 17 of its control, start button 21, terminals 22-24 . 3 il. with (L

Description

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The invention relates to measurement techniques and can be used to measure the bandwidth of the amplitude-frequency characteristics, the maximum transmission coefficient, and the transmission ratio factors at given frequencies of the quadrupole.

The purpose of the invention is to expand the functionality of the device by providing a measurement of the bandwidth of the amplitude-frequency characteristic of the quadrupole at a predetermined level.

Figure 1 shows the block diagram of the device; figure 2 - distribution scheme. command device; in fig. 3 - timing diagrams of w1, which explain the operation of the device.

The device (Fig. 1) contains a oscillating frequency generator (GKCH), a start-up unit 2, a command distributor 3, examines a quadrupole 4, an input signal detector 5, an electronic frequency scale generator 6, an output signal detector 7, a video detector 8, first 9 and second 10 elements AND, recalculation unit 11, indicator 12, comparator 13, input unit 14, first element OR 15, first comparison element 16, attenuator control unit 17, controlled attenuator 18, second comparison element 19 , second element OR 20, start button 21, first 22 and the second 23 terminals of the device for connecting the tested quadrupole and the third terminal 24 of the device.

The output of the oscillating frequency generator 1 is connected to the inputs of the input signal detector 5, a generator of 6 pulses of an electronic frequency scale and a first terminal 22 of the device for connecting the four-pole 4 under investigation, the second terminal 23 of which through the output signal detector 7, video detector 8, the attenuator 1B controlled by the first comparison element 16, the first element AND 9, the second element OR 20, and the attenuator control unit 17 are connected to the control input of the controlled actuator 18 and to the second input indicator 12. The output of detector 5 of the input signal is connected to the second input of the first comparison element 16 The first output of the distributor 3 command is connected to the control input of the video detector 8. The second output distributes the command body 3 connected to the first input of the first element OR 15 whose output is connected to the second input of the first element AND 9. The third output of the command distributor is connected to the second input of the second element AND 10, the first input of which is connected to the control input of the conversion unit 11 and the output of the second comparison element 19 Fifth output 3 edelitel commands coupled to the control input of the trigger 2, the first trigger input coupled to the third terminal 24 of the device. The second trigger input block 2 launch through button 21 start connected to the common bus device. The output of the start-up unit 2 is connected to the input of the command distributor 3 and the control input of the oscillating frequency generator 1. The fourth output of the command distributor 3 is connected to the third input of the indicator 12 and the control input of the input unit 14. The output of the frequency generator 6 of the electronic frequency scale pulses is connected via the recalculation unit 1 1 to the first inputs of the indicator 12 and comparator 13, the second input of which through the input unit 14 is connected to the first input of the ator1 control unit 17. The output of comparator 13 is connected to the second input of the first element OR 15. The output of the second element AND 10 is connected to the second input of the element OR 20. The output of the output signal detector 7 is connected to the first input of the second comparison element 19, the second input of which is connected to the output of the controlled attenuator 18.

The command distributor 3 (FIG. 2) contains a serially connected binary-decimal counter 25, a decoder 26 and a logical distributor 27 (27. 27.5). The input of the distributor 3 commands is connected to the counting input of the binary-decimal counter 25. The outputs of the counter 25 are connected to the inputs of the descrambler 26, whose 1.1 inputs are connected to the inputs of the logical distributor 27. At the outputs of the logical distributor 27 depending on the state of the binary-decimal A counter 25 appears logic levels corresponding to the measurement modes.

The device works as follows.

When the start button 21 is pressed from the output of block 2, which represents the co6ofi short pulse generator with a repetition period T (Fig. 3), the first pulse starts the GCP and enters the input of the binary-decimal counter 25 of the distributor 3, recording code ed1 s (Fig. For). At the first output decoder iTOpa 26, the distribution of bodies 3 appears a logical unit. On P1. | The stroke x of the distributor 3 is set to zero lines; e 1i. The output from the binary-t of the counter 25 also receives the input unit 14, setting the necessary frequency for measuring the transmission coefficient. From the first output of the distributor 3, the zero voltage is fed to the control input of the video detector 8, which is set to the tracking mode. In this mode of operation, the output voltage of the video detector 8 completely repeats the voltage of the signal at its input. The input voltage of the video detector 8 is fed to the input of the controlled attenuator 18. The frequency code from the input unit 14 is fed to the second input of the comparator 13 codes. A digital code from the output of the conversion unit 11 is supplied to the first input of the comparator 13 codes. At the moment of equality of the codes, the comparator 13 generates a pulse, which, through series-connected elements 15, 9 and 20, enters the second input of block 17. Attenuator 18, elements 15, 9 and 20 and block 17 form a closed loop that measures the ratio of the two voltages. At the moment when the frequency of the oscillating frequency generator 1 is equal to that set in the input unit 14, the process of balancing the voltages at the inputs of the comparison element 16 is performed. After the equilibration process is completed, the output code of the attenuator control unit 1, which arrives at indicator 12, corresponds to the transfer ratio of the quadrupole 4 at a given frequency.

The second pulse, which is generated by the start-up unit 2, starts the sweep, is fed to the input of the binary-decimal counter 25 of the distributor 3, recording a code corresponding to the number 2 (FIG. 3b). At the second output of the decoder 26, a logical unit appears (Fig. 2). At the first and second outputs (Figures 1 and 2) of the distributor 3

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20

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a logical unit appears, and at the third output, a logical zero. This mode corresponds to the measurement of the maximum transmission coefficient. The signal from the outputs of the binary-decimal counter 25 of the distributor 3 commands is fed to the input block 14, and the necessary code (figure 2) corresponding to the required level is set in it. From the first output of the distributor 3, the signal of the logical unit sets the video detector 8 to the peak detection mode and storage of the maximum value of the input signal. In this mode, the voltage at the output of the video detector 8 after reaching the frequency corresponding to 11 maximum of the 4th transmission coefficient; o, nick 4, is equal to the voltage corresponding to the maximum transmission coefficient that goes to the input of the controlled attenuator 18.

The voltage of the logical unit from the second output of the distributor 3 commands through the element OR 15 to the second input of the element AND 9, which leads to the formation of a closed loop, which includes the attenuator control unit 17, controlled by the attenuator 18 and the comparison element 16. The digital code corresponding to the maximum transfer ratio of the quadrupole 4 comes from the output of the attenuator control unit 17 to the second input of indicator 12. With the arrival of a subsequent start pulse corresponding to the beginning of the sweep of the generator 1, the second output is installed at the second output (fig. Zb) of the distributor 3 com. a voltage corresponding to a logic zero, and the voltage of a logical unit is set at its third output (Fig. 3b). In the attenuator control unit 17, a digital code is entered from the output of the input unit 14, corresponding to the required level K. The third pulse, which is generated by the start-up unit 2, starts the sweep and enters the input of the binary-decimal counter 25 of the distributor 3, recording into it a code corresponding to number 3 (fig.Zv). At the third output of the decoder, a logical unit appears. On the first and third outputs of the command distributor, a logical unit appears, on the second output, a logical zero. This mode

corresponds to the measurement of the bandwidth of the quadrupole. The signal from the binary-decimal counter 25 is fed to the input block 1A, setting the codes determined by the transmission coefficients of the controlled attenuator 18.

At the output of the comparison element 16, the voltage of the logic unit is set when the generator frequency 1 kachayup, its frequency is located within the bandwidth of the measured quadrupole A. The output voltage of the comparison element 16 sets the time interval for counting the frequency mark pulses by the conversion unit 11, arriving from the output of the former 6 pulses of the electronic frequency scale.

The digital code corresponding to the value of the quadrupole bandwidth A, comes from the output of the conversion unit 11 to the indicator 12.

Upon receipt of the fourth pulse generated by the start-up unit 2, the binary-decimal counter 25 of the distributor 3 records information corresponding to the number A. At the fourth output of the decoder 26 of the distributor 3, a logical unit appears that resets the counter 25 to its initial state and arrives at start-up unit 2, stopping the pulse generator, which ensures that the device is reset.

Claims (1)

Invention Formula A device for automatically measuring the parameters of the amplitude-frequency characteristics of the quadrupole, which contains a oscillating frequency generator, the output of which is connected to the first terminal of the device for connecting the studied quadrupole, the second terminal of which is connected to the input of the output signal detector, pulse shaper, electronic frequency scale, whose input connected to the output of the oscillating frequency generator and the input of the input signal detector, and the output of the electronic frequency generator first scale conversion unit is connected via a first input of the indicator and the first input of the comparator, the second input of which via The input block is connected to the first input of the attenuator control unit, the second indicator input is connected to the output of the attenuator control unit and the control input of the controlled attenuator, the output of which is connected to the first input of the And element through the first comparison element, the second input of the first comparison element is connected to the detector output input signal, characterized in that, in order to expand the functionality of the device by providing measurement of the bandwidth of the amplitude-frequency characteristic of the four-field a second level element, two OR elements, a second AND element, a command distributor, a start block, a start button and a video detector, while the output of the output signal detector is connected to the video detector input and the first input of the second comparison element, the second input of which is connected to the output of the controlled attenuator, and the output of the second comparison element is connected to the first input of the second element AND and to the control input of the conversion unit, the output of the video detector is connected to the input of the controlled attenuator the control input of the video detector is connected to the first output of the command distributor, the second output of which is connected to the first input of the first element OR, the third output of the command distributor is connected to the second input of the second element AND, the output of which is connected to the first input of the second element OR, the fourth output the command distributor is connected to the third input of the indicator and the control input of the input unit; the fifth output of the command distributor is connected to the control input of the start block, whose code is connected to the input of the command bodies and the control input of the oscillating frequency generator, the first triggering input of the startup unit is connected to the third terminal of the device, the second startup input of the startup unit is connected via a start button to the common bus of the device, the second input of the first OR element is connected to the comparator output, and the output is connected to the second input of the first element AND, the output of which through the second element OR is connected to the second input of the attenuator control unit