SU573776A1 - Attenuation decrement meter - Google Patents

Description

control and to the first input of the gel and through the key to the second input of the controller, the control input of the key is connected to the output of the coincidence element, the third input of which is connected to the opposite phase output of the zero threshold comparator, and the second input through the converter connected to the output controllable delay line, the control input of which is connected to the detector of the average frequency, and its input - with the trigger output of the upper threshold, the reference input of which is connected to the second output of the reference voltage source and the reference input rigger lower threshold, and a zero input opo.rnym threshold comparator and output the average value detector WMOs Nogo signal whose input is connected to the input terminal of the device. FIG. 1 given the structural electrical circuit of the proposed device; Fig 2: stress diagrams (a, b, c, d, d, e, g 3, u). The device contains a series-connected limiting amplifier 1, zero threshold comparator 2, differentiating circuit 3j frequency discriminator 4, average frequency detector 5, average signal detector 6, the source 7 of the reference voltage the first output of which is connected to the reference input Gera 8 is the upper threshold, and the second output is the one input of the trigger 9 of the lower threshold, the controlled delay line 10s amplifier inverter 11, e. cement 12 coincidence, the first input of which is connected to the output of the trigger 9 of the lower threshold, generator 13 counting pulses, key 14, control unit 15 and calculator 16 "- Moreover, the output of differential circuit 3 is connected through a series-switched frequency discriminator 4 and a medium-frequency detector 5 to the input of a controlled oscillator 13 counting pulses, the output of which is directly connected to control unit 15 and to the first input of calculator 16, and via key 14 to the second input of calculator; Control input of key 14 is connected to the output of coincidence element 12, the third input of which is connected to anti-phase output to omparator 2 has a zero threshold, and a second input through an amplifier-inverter 11 is connected to the output of a controlled delay line 10, the control input of which is connected to the detector 5 of the average frequency, and the input to the output of the upper threshold trigger 8, the reference input of which is connected; with the second output of the source 7 reference voltages and with the reference input of the trigger 9 of the lower threshold, the reference input of the comparator 2 zero and the detection output of the average value of the input signal, the input is connected to the input terminal of the device. The device operates as follows: An O1-junction input signal (Fig. 2a) is fed simultaneously to the limiting amplifier 1, the output of which receives a signal of the square-wave type with a random phase (Fig. 26). The regulatory component of the input signal is taken into account by applying a voltage (fig. 2d) from the output of the detector 6 to an average value of the signal to the reference inputs of the comparator 2 zero level and triggers 8 and 9. The signal (fig. 2e) from the output of trigger 8 is delayed in the delay line 8 10 per time equal to half the period of the average 31 LI i: t of the input signal, the value of which is determined by the signal level of the detector of the average frequency 5, and through the amplifier y-I 1 the inverter 11 is fed to the coincidence element 12. At the same time, signals (Fig. 2c) and the zero-phase comparator 2 of the zero threshold and the lower threshold trigger 9 output are supplied to the inputs of the coincidence element, respectively. The first signal is used as a sync. At the output of element 12, coincidences will appear, the duration of which will be equal to the time of coincidence of the positive half-wave of the signal from the output of comparator 2 and negative pulses (Fig. 2e and g). This signal controls the key 14 through which the counting pulses from the controlled generator 13 of the counting pulses are delivered to. arithmetic unit (calculator) 16. In an arithmetic unit, the number of counting pulses is compared, - transmitted from the controlled oscillator 13 through the key 14 and, min, in the time specified by the control unit. The quality of the control unit uses a frequency divider of the pulses coming from oscillator 13. Thus, the rate of operation of the arithmetic unit is set, preventing the dependence of the accuracy of the results produced by the arithmetic unit on the input signal frequency. The frequency of the counting pulses is controlled by the signal fed to the control input of the generator 13 of the counting pulses from the output of the detector 5 of the average frequency. The initial levels of the Reference voltages on the triggers 8 and 9 are supplied from the source 7 of the reference voltages. Their signs are opposite, and the values are selected depending on the expected value of the damping factor. The higher the decrement value, the smaller the difference between the voltages of the upper and lower thresholds. This makes it possible to avoid idle plots for large values of the damping decrements, the presence of which would distort the result of gereni.

Similarly, the device also operates when its input is applied to a deterministic damped signal at subcritical values of the damping decrements,

Formulas

the invention

A device for measuring the damping decrement containing an inverter, an amplifier limiting device, the output of which is connected to a differentiating circuit through a zero threshold comparator, and the input is connected to the input terminal and to the control inputs of upper and lower thresholds, the voltage source, the first output of which is connected to the reference the trigger input of the upper threshold, and the second output with the reference input of the lower threshold trigger, and the coincidence element, the first input of which is connected to the trigger output of the lower threshold, which differs from In order to expand the functionality and increase the accuracy of measurements, a frequency discriminator, a mean frequency detector, a mean input signal detector, a controllable line, delays, a controlled counting pulse generator, a key, a control unit are introduced into it, and the output mentioned A di4x | 1account circuit is connected via a series-connected frequency discriminator and a mean frequency detector to the input of a controlled counting pulse generator, the output of which is directly is connected to the control unit and to the first input of the calculator and through the key to the second input of the calculator, with (the control input of the key is connected to the output of the coincidence element, the third input of which is connected to the antiphase output of the comparator i of the zero threshold, and the second input through the the inverter is connected to a 1-input controllable delay line, the control input of which is connected to the average frequency detector, and the input is its output of the upper threshold trigger, the reference input of which is connected to the second output of the reference source voltages with a reference trigger input of the lower threshold and with a zero-threshold comparator input of the detector and with a detector output of the average input signal, the input of which is connected to the Hoff input terminal of the device.

Sources of information taken into account in the examination:

1. USSR author's certificate No. 324591, cl. G-01 R 27/28, 04.04.68.

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