SU1658404A2 - Device for driving test signals - Google Patents

Abstract

The invention relates to telecommunications. The purpose of the invention is to improve the formation accuracy. The device contains a sinusoidal signal generator 1, a reference voltage generating unit 2, a comparator 3, a threshold level controller 4, a signal matching unit 5, a multivibrator 6, an integrator 7, a pulse shaping unit 8, a transient driver 9, a noise signal generator 10, a block 11 voltage summation, conversion and recording output unit 12, inverter 13, differentiating circuit 14, timer 15, keys 16 and 17. Pulses from the output of block 8 through inverter 13 connected in series, differentiating circuit 14 and Thai Measures 15 are fed to the control inputs of the keys 16 and 17, ensuring that the beginning of the superposition of the frequency and noise components is combined with the beginning of the transient signals and the regulation of the superposition time of these components. 2 Il. AND

Description

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The invention relates to telecommunications, can be used in multichannel communication systems and data transmission, in multichannel systems for measuring and recording transient and non-stationary processes during their monitoring and testing, automatic control systems and is an improvement of the device by author. St. N: 978369.

The purpose of the invention is to improve the formation accuracy.

FIG. Figure 1 shows the structural electrical circuit of the device proposed; in fig. 2 - time diagrams that show his work.

A device for generating test signals contains a sinusoidal signal generator 1, a reference voltage generating unit 2, a comparator 3, a threshold level controller 4, a signal matching unit 5, a multivibrator 6. an integrator 7, a pulse generation unit 8, a transient driver 9, a generator 10 noise signals, voltage summation unit 11, conversion and recording output unit 12, inverter 13, differentiation circuit 14, timer 15, first and second keys 16 and 17.

The device works as follows.

The pulses of the multivibrator 6 (Fig. 2a), single or periodically following, are fed to the input of the integrator 7 and the triggering (starting) input of the output unit 12 of the conversion and registration. From the output of the integrator 7, the signal goes to the second input of the comparator 3, which produces a pulse (FIG. 2b), lagging behind the delay time t3 from the pulse of the multivibrator 6. This time depends on the parameters of the integrator’s RC circuit 7 and the value of the reference voltage supplied to the first input of the comparator 3 from the unit for the formation of the reference voltage through the regulator 4 of the threshold level. Using the pulse shaping unit 8, to the input of which a signal is output from the comparator 3, a voltage surge is generated, which is fed to the inverter 13 and simultaneously to the input of the transient driver 9, for example, consisting of a set of filters with different transient characteristics. receiving receive the necessary signal of the transition process (Fig. 2 g), the beginning of which occurs through time.

The inverted signal from the output of the inverter 13 is differentiated by the differentiating circuit 14 and starts the electronic timer 15. The timer generates a positive pulse adjustable in duration (Fig. 2c), which is fed to the control inputs of the electronic switches 16 and 17. The first key 16 switches the signal of the sinusoidal generator 1 signals (Fig. 2d) to the second input of the voltage summation block 11, and the second key 17 switches the signal of the noise signal generator 10 (Fig. 2 e) to the third input of the voltage summing block 11. Thus, at the output of the voltage summation unit 11 (Fig. 2 g), a test signal is generated, in which the onset of the transient signal lags behind the trigger pulse at time t3. The beginning of the superposition of sinusoidal and noise signals coincides with the beginning of the transient process, and the time of superposition is determined by timer 15. The total signal through the signal matching unit 5 enters output conversion and recording unit 12.

Consequently, by changing the parameters of the timing circuit of the electronic timer, it is possible to regulate the time of application of disturbances. In this case, before starting the transition process, a hardware zero will be recorded.

Claims (1)

Claims of Invention A device for generating test signals of multichannel measurement systems and communication by author. St. No. 978369, in contrast to the fact that, in order to increase the formation accuracy, the output of the sinusoidal signal generator is connected to the second input of the voltage summing unit through the inputted first key, output the noise signal generator is connected to the third input of the voltage summation unit through the input of the second key, and the output of the pulse shaping unit is connected to the control inputs of the first and the second keys through the entered sequentially connected inverter, differentiating circuit and timer. and ff - and s and LLLALLALLALLALL. t Lw "fr4 and F  n - t