SU868620A1 - Device for determining electric signal energy spectrum - Google Patents

Description

one

The invention relates to electrical measuring technology and can be used to create low-frequency signal spectral analysis devices.

A device for determining the energy spectrum of electrical signals is known, comprising an input discrete voltage divider, a matching unit, N selective channels consisting of a band-pass filter, a detector, an integrator, and also an information unit l3.

However, this device has a low accuracy.

Closest to the proposed technical entity is a device for determining the energy spectrum of an electric signal, containing bandpass filters, detectors, a display unit and serially connected input voltage divider and a matching unit, the output of which is connected to the inputs of bandpass filters, the output of which through c 5 the corresponding detector is connected to the corresponding input of the information display unit

G21.

The disadvantage of this device is the presence of input and additional discrete voltage dividers, requiring time-consuming to install manually the input discrete voltage divider switch and the additional voltage divider mechanically connected to it, preventing the automatic measurement process.

The aim of the invention is to improve the accuracy.

This goal is achieved by the fact that the device for determining the 15 energy spectrum is electrical. signal, containing bandpass filters, detectors, a display unit, and an input voltage divider connected in series and

20 a matching unit, the output of which is connected to the inputs of bandpass filters, the output of each of which is connected to the corresponding input of the information display unit through a corresponding detector, a conversion unit and a control unit are entered, whose input is connected to the output of the matching unit, the output of the control unit is connected to the second input input

30 and a voltage divider with an input of a conversion unit, the output of which is associated with an auxiliary input of the information displaying unit.

The drawing shows a block diagram of the device.

The device comprises an input voltage divider 1, a matching unit 2, band-pass filters 3, detectors 4, an information display unit 5, a control unit 6 and a conversion unit 7.

The input voltage divider 1 serves to automatically adjust the attenuation of the signal under study, in order to maintain a constant voltage level at the input of the matching unit. The automation of the process of adjusting the attenuation of the signal under investigation is achieved by means of the control unit 6 for controlling the input voltage divider 1. The matching unit 2 serves to match the impedance of the input circuits of the bandpass filters with the output impedance of the input divider 1 voltage and also to amplify the signal under study. The band-pass filters 3 of the device are made with a bandwidth of 1/3 octaves and serve to separate the harmonic components of a complex signal. The number of filters corresponds to the number of frequencies of decomposition of the signal under study. The detectors 4 rectify the alternating voltage taken from the band-pass filters 3.

The information display unit 5 is made on linear gas-discharge voltage indicators, the number of which is equal to the number of electoral kangshov plus one. The last indicator serves to display the magnitude of the attenuation of the signal under study.

The control voltage conversion unit 7 serves to match the signal controlling the input voltage divider with an additional indicator of the information display unit 5.

The device works as follows.

The signal under study is fed to the first input of the input voltage divider 1, then amplified in the matching unit 2. The reinforced voltage through the control unit 6 controls the input voltage & 1 to the second (control) input of the input voltage divider 1 and adjusts the splitter oscillator ratio, thus maintaining a constant voltage level at the input of the matching unit 2.

From the output of the matching unit 2, the voltage also goes to the bandpass filters 3, where the harmonic components of the signal under study are detected, which are detected in the detectors 4, after which the rectified signals are fed to the inputs of the display unit 5.

From the output of the control block b, the signal is converted in the conversion unit 7 and fed to the auxiliary input of the display and output unit 5, indicating on the indicator the amount of attenuation of the voltage under study.

The use of the control unit 6 is input; the voltage divider 1 and the control voltage conversion unit 7 in the device for determining the energy spectrum of the electric signal provides the following advantages: automating the process of selecting the measurement limit of the signal under study, which allows the device to be used in automatic measurement systems and automatic control systems; an increase in the measurement efficiency due to the shortening of the time for choosing the limit of the measurement; increase the accuracy of the device.

Claims (2)

Invention Formula A device for determining the energy spectrum of an electrical signal containing bandpass filters, detectors, an information display unit and serially connected input voltage divider and a matching unit whose output is connected to the inputs of the bandpass filters, the output of each of them through the corresponding display unit information, characterized in that. In order to increase accuracy, a conversion unit and a control unit are inputted, the input of which is connected to the output of the matching unit, the output of the control unit is connected to the second input of the input voltage divider and to the input of the conversion unit whose output is connected to the auxiliary input of the output unit information. Sources of information taken into account in the examination . 1. USSR author's certificate No. 370541, C. 01 R 23/16, 25.05.71. 2. USSR author's certificate No. 442438, class C 01 R 23/18, 10.05.72 (prototype).