SU1308943A1 - Device for checking amplitude characteristics - Google Patents

Abstract

The invention relates to a measurement technique and can be used to control the amplitude characteristics of technical means and communication channels with variable parameters. An introduction to a device for monitoring single-threshold comparators 27, 28, an analog integrator 29, one-oscillators 30, 31, an OR element 32, an amplitude detector and an output key 26 increases its noise immunity. 2 Il. (L oo about 00 with 4 OO, Figure 1

Description

The invention relates to a measurement technique and can be used to control the amplitude characteristics of technical means and communication channels with variable parameters.

The aim of the invention is to improve the noise immunity of the device.

Fig, 1 shows a block diagram of the device; FIG. 2 shows signal timing diagrams explaining its operation.

The device (Fig. O contains a source 1 of a linearly decreasing p-step voltage, the output of which is connected via object 2 of the control to the input of the detector 3, the output connected to the input of the memory block 4, the linear divider 5 of the voltage, elements 6- .8 comparisons, keys 9-11, the outputs of which are connected to the input of the first element OR 12, the recorder 13, the adaptive block 14 of synchronous pulses, the shaper 15 is the voltage, the output of which is connected to the inputs of the time trigger formers 16-18, the trigger shapers 19-21 control voltage, trigger 22 the first and second terminals 23 and 24 of the device for connecting the object under study, the amplitude detector 25, the output connected to the input of the output switch 26, the first and second one-time comparators 27 and 28, the analog integrator 29, the first and second single-vibrators 30 and 31 and the second element. OR 32.

The device works as follows.

The control signal in the form of a sequence of uniformly decreasing step voltages is simultaneously sent to the input of a single-threshold comparator 27 and detector 3. From the output of the detector, the control signal envelope (Fig. 2.1) goes to the input of memory block 4 and to the first inputs elements 6-8 comparison. In the memory block, the value of the first maximum step of the control voltage is determined and stored for the entire measurement cycle. This voltage is divided evenly into fractional parts in a linear voltage divider 5, producing, as it were, a reference signal according to the uniformity of the characteristic.

The number of parts is determined by the number of steps of the pilot signal. From the outputs, the voltage divider is supplied to the second inputs of elements 6-8 of the comparison.

Thus, at one input of the elements of the comparison, the voltage of the quasi-reference voltage is permanently present, and at the other inputs - the voltage of the steps directly from the detector output.

The result of the comparison is through keys 9-11 and the element OR 12 enters the amplitude detector 25, in which the result of the comparison is memorized and held until the end of the monitoring cycle.

At the end of the monitoring cycle, the output key 26 is opened and passes the result of the comparison to the recorder 13. The output key is unlocked only if it is level and the signal at the input of the device corresponds to the parameters of the control signal.

The level is analyzed in the first single-threshold comparator 27, and the distance is analyzed in the analog integrator 29.

The coherence of the operation of the elements of the device is provided by the adaptive block of 14 synchronous pulses.

For this purpose, the voltage from the second output of the detector is fed to the input of the driver 15, which produces a voltage that determines the beginning of the control cycle (Fig. 2c |), and triggers the time triggers 16-18 (Fig. 2B, 2 J e ), which determine the sequence and moment of sampling the results of the comparison of each step of the voltage. With a falling edge, these triggers trigger the trigger voltages 19-21 of control voltages (Fig. 2B, 4, H), which determine the time duration of the sample and control the keys 9-11.

Simultaneously with the trigger-formers of time, the first single-threshold comparator 27 (Fig. 2a) is triggered and the voltage on the analog integrator 29 begins to increase (Fig. 2c). At a point in time equal to the duration of the control pulse, the second one-threshold comparator 28 (ph2. 2k), which the front one starts the first one-oscillator 30, triggers. The last produces a voltage pulse (figure 2), which opens the output key 26 and passes

Comparison result to recorder. By its falling edge, this pulse, through the OR element 32, triggers the switching trigger 22 (Fig. 2m), freeing the memory unit, the amplitude detector and the analog integrator from the test voltage and preparing the device for the next cycle.

In case of violation of the linearity of the amplitude characteristic, for example, the occurrence of a limitation (Fig. 2, II), the entire previous cycle is repeated. . But in this case, a voltage pulse appears at the output of the first element OR (fig.2n), which is stored in the amplitude detector (fig.2o) and when the output key opens, it passes an alarm signal to the recorder (fig.2p).

In the event of a short-term interference (Fig. 2, III), the sample pulses are developed, but they do not result in a false alarm signal, since in this case the first single threshold comparator 27 returns to its original state (Fig. 2).

By its falling edge, it launches the second one-shot 31 (fig. 2p), which, in turn, starts through the switching element OR (switch 2m), which causes the device to reset.

In the first two cases, the second one-oscillator does not affect the circuit of the device, since its pulse duration is somewhat greater than the pulse width of the first single-vibrator, which, therefore, earlier trips the switching trigger.

The use of the device as part of radio links, automated paths and technical means with varying parameters will significantly improve the noise immunity and virtually eliminate the occurrence of false alarm signals, which will increase the reliability of communication and the effectiveness of preventive and experimental work.

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Claims (1)

Apparatus of the Invention A device for monitoring amplitude characteristics containing a recorder, a source of linearly killing p-step voltage, the output of which is connected to the first terminal of the device for connecting a test object, the second terminal of which is connected to the input of a linear voltage divider through the series-connected detector and memory Each of the p-1 outputs of which is connected through the corresponding series-connected comparison element and the key is connected to the corresponding inputs of the first IL element. , the second n-1 inputs of the comparison elements are connected to the detector output, the second output of the latter is connected to the input of the voltage driver, the output of which is connected to the inputs of the n-1 trigger time drivers, the output of each of which is connected via the corresponding trigger driver driver to the corresponding control input of the n-1 keys, the output of the switching trigger is connected to the control input of the memory block, which is connected with the fact that, with V) the purpose of improving the noise immunity, two single-threshold com- aarator, analog integrator, two one-shot, second OR element, amplitude detector and output key, while the other terminal for connecting the test object through the first single threshold comparator connected in series, the analog integrator and the second single threshold comparator connected to the input of the first single vibrator, the first output of which is through the OR element is connected to the input of the switching trigger, and the second output is connected to the control input of the output key, the output of which is connected to the recorder's input, and A through the amplitude detector is connected to the output of the first element OR, the second output of the first comparator is connected via the second one-shot to the second input of the second element OR, the control input of the memory unit is connected to the control inputs of the analog integrator and the amplitude detector. 35 40 45 50 55