SU785791A1 - Discrete meter of amplitude-frequency characteristics - Google Patents

Description

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The invention is intended for use in radio engineering installations for various purposes, in particular, it can be used to control communication channels of radar signal processing devices and high-quality sound-transmitting equipment as an additional indicator channel, through which the desired amplitude-frequency characteristic of the working channel is established.

Devices are known for determining the amplitude-frequency characteristics, quadrupoles, comprising a sweep frequency generator with an upgrade circuit, a detector, an oscillographic indicator, a pulse generator, discrete elements, and the measurement accuracy l ,.

Use in the (Device, an oscillographic indicator with a high-voltage power supply unit leads to an increase in the dimensions of the device, and when operating in modern transistor equipment requires the use of additional power supply units, which hinders the use of these devices in the equipment characteristic of

a feature of which is compactness, simplicity.

The monitoring time of the amplitude-frequency characteristic of the three-pole four-pole system under study in such a device is determined by the time of the analysis of the characteristic reproduced on the TF-ray indicator. The minimum time for analysis is measured.

in seconds, it is therefore difficult to combine periodic monitoring of the device with simultaneous transmission of information through it.

The aim of the invention is to improve the performance of measurements.

The goal is achieved by the fact that the meter of amplitude-frequency characteristics, containing a series-connected modulating voltage generator, a tunable generator, a quadrupole under study and an amplitude detector, a pulse generator, an indicator of A1 "1 liters, a comparator and a control unit,

25 connected by one of the outputs to the installation inputs of the counter, a trigger, a matching element, a pulse distributor and n amplitude indication channels, inputs of which are connected to the output of the counter, and a control input of each channel connected to the corresponding output of the pulse distributor, the input connected to the second output a control unit, the input of which is connected to the output of the pulse generator, and the third output of the control unit is connected to one of the inputs of the comparator, the other input of which is connected to the output of the amplitude detector and the comparator output through a serially connected trigger and a matching element connected to the counter input, the setup input of which is connected to the second trigger input, while the second input of the matching element is connected to the fourth output of the control unit, and each channel of the amplitude indication is connected in series memory code converter and amplitude indicator. Figure 1 presents the block diagram of the discrete meter amplitude-frequency characteristics; 2, time diagrams of voltages explaining the operation of the device. The device contains a pulse generator 1, a control unit 2, a modulating voltage generator 3, a tunable generator 4, a quadrupole under study 5, an amplitude detector b, a comparator 7, a trigger 8, a block 9 of coincidence, a counter 10, parallel frequency channels 11 for indicating amplitude in controlled points kah of the amplitude-frequency characteristic, blocks of 12 memory, converters 13 codes, indicators 14 of amplitude, distributor 15 pulses. Frequently tuned generator 4 is fed to the input of a step voltage (Fig. 2a,) from the generator 3 of modulating voltage. The amplitude of the voltage of the first step is chosen so that the frequency of the output voltage of the generator corresponds to the beginning of the analyzed section of the frequency characteristic of the quadrupole under study 5. The number of steps n determines the accuracy with which the amplitude-frequency characteristic needs to be monitored. The step duration T must be significantly longer than the transient process time in the device and the studied quadripole. Thus, the input of the investigated quadrupole receives a sinusoidal voltage of constant amplitude with a discrete time-varying time (Fig. 2b). will be determined by the modulus of the coefficient of transfer of the quadrupole at the corresponding frequency. After detection in the amplitude detector b (Fig. 2c), the voltage is applied to the first The second input of the comparator 7, to the second input of which, from the control unit 2, a sawtooth voltage is applied (Figure 2d), which is delayed relative to the step for the duration of the transients. Simultaneously with the beginning of the sawtooth voltage and the pulses coming from the control unit 2, the trigger 8 is set to the initial state (Fig. 2e), the trigger 8 is reset at the moment of equality of the sawtooth voltage and the output voltage of the amplitude detector G (leading edge pulse, 2 d). The trigger pulse output time is proportional to the amplitude of the output voltage of the amplitude detector 6 (Fig.2 and). In coincidence block 9, the trigger 8 pulses are filled with pulses with a stable repetition period (Fig.2) coming from the control block 2. The repetition period of the filling pulses is determined by the pulse generator 1 and is selected based on the condition of ensuring the required measurement accuracy of the modulus 1) of the transmission amplitude-frequency characteristic of the quadripole under study. From the output of block 9, coincidence of a burst of pulses with a maximum number of pulses in a burst equal to hl is sent to the first input of the counter 10, which is to be whipped before counting begins (Fig. 2e). Counter 10 is required for intermediate storing of information (rewritten in parallel code through the channels of the pulse distributor 15 (Fig. 2 l, m, n) to the memory blocks 12 of the frequency channels 11 of the amplitude indication at the controlled points of the amplitude-frequency characteristic. The number of the amplitude indication channels 11 is equal to the number of voltage steps n produced by the modulating voltage generator 3 and the number of pulse packets generated at the output of the counter 10 per cycle of the amplitude-frequency characteristic analysis. The frequency-frequency characteristic is equal to T. The shape of the amplitude-frequency characteristic is produced by an amplitude indicator 14, made in the form of a scoreboard consisting of n vertical rows, each of which contains m LEDs or miniature incandescent bulbs. where it is stored in the 12pam block, the 13k code converter is applied. The use of the proposed invention will allow the on-line monitoring of the amplitude-frequency characteristics of the quadrupoles, t How much time it takes them to conduct control, significantly

less time required for devices of similar purpose. This is due to the fact that after a single cycle of monitoring, information about the shape of the amplitude-frequency characteristic is stored and displayed for analysis, and the monitored device is put into operation. Information about the amplitude-frequency characteristic of the control object in digital form can be easily transmitted over communication channels for analysis. The device differs from the well-known technical solutions by the absence of a cathode-ray tube, and hence by its small size, as well as compatibility with equipment made on transistors and microchips.

Claims (2)

Invention Formula I 1. Discrete amplitude-frequency characteristics meter containing serially connected modulating voltage generator, tunable oscillator, researched quadrupole and amplitude detector, pulse generator, amplitude indicator, comparator and control unit connected by one of the outputs to the meter installation input about the same that, with a view increase the productivity of measurements, a trigger, a matching element, a pulse distributor and n amplitude indication channels are inputted to it, the inputs of which are connected to the counter output, and the control input of each channel is connected to the corresponding output of the pulse distributor, which is connected to the second output of the control unit whose input is connected to the output of the pulse generator, and the third output of the control unit is connected to one of the inputs of the comparator, the other input of which is connected to the output of the amplitude detector And the output of the comparator 5 through a serially connected trigger and a matching element is connected to the input of the counter, the installation the input of which is connected to the second input of the trigger, while the second 0 the input of the match element is connected to the fourth output of the control unit, 2. The discrete meter according to claim 1, characterized in that each amplitude indication channel is made in the form of a serially connected memory block, a code converter and an amplitude indicator. Sources of information taken into account in the examination 1- USSR author's certificate 0 No. 476521, class G 01 R 27/28, 19V3: (prototype).  "- -Jc 7.d .r /, - --vibf, v-t ..liiy V. pp / - e -Gy 5 „Тb Well and to m