SU953596A1 - Device for automatic checking of amplitude frequency characteristics - Google Patents

Description

one

The device relates to electrical measuring equipment.

Known meters of amplitude-frequency characteristics. Using--; Controls for linear quadrupoles, including filters

The disadvantage of these meters is the low measurement accuracy.

The closest to the invention according to Q technical essence is a device containing a synthesizer, amplitude modulator, slow-voltage generator, recording and control unit, memory unit, 15 two amplitude meters, two controllable keys, two blocks and a peak detector 2.

In this device, at the beginning of the measurement, a predetermined signal level at the output of the object under test is set at a certain frequency and fixed with a block of

The input voltage level supplied from the synthesizer through the modulator to the input of the object under study. Subsequently, the measurement of the output signal from the object under study is carried out and recorded at the same moments when the input signal level, which is changed in the modulator under the influence of the control signal from the slow-voltage generator, reaches the value fixed by the memory unit. After registering the output, the control unit instructs to change the frequency in the Synthesizer, and the process repeats. ..

Claims (2)

Thus, this device measures the amplitude-frequency characteristic (AFC}, as the output voltage depends on the frequency of the input voltage at a constant amplitude of the latter. For the objects under study with a wide dynamic range DFC in the frequency range of interest and a noticeable level of the object's corresponding noise error measurements are very large, since the output signal at frequencies with high attenuation is masked by noise. Such objects include, for example, active filters, linear active high gain circuits, etc. The purpose of the invention is to improve the accuracy and functionality of the device, i.e., to expand the class of objects to be studied. The goal is achieved by the fact that the device for automatically controlling the amplitude-frequency characteristics containing the sequential recording and control unit , a synthesizer and a modulator, as well as a slowly-variable-voltage generator, an amplitude meter, and a detector, a two-threshold comparator and a memory key are entered, and the modulator output is connected With the inputs of the device and the amplitude meter, the output of which is connected to the input of the recording and control unit, the output of the slow-voltage generator is connected via a memory key to the modulator control input, another input of the device is connected to the input of the two-threshold comparator through the detector which is connected to the control inputs of the registration and control unit, and a key with memory. The drawing shows the structure diagram of the device controlling the amplitude-frequency characteristics of linear electric circuits. The device contains a synthesizer 1, a modulator 2, an amplitude meter 3, a registration and control unit C, a generator of slow voltage 5, a key with memory 6, an output signal detector 7, and a two-threshold comparator 8. A signal of a certain frequencies from synthesizer 1 through modulator 2. The latter is a broadband amplifier with deep gain control with an external control voltage, which is supplied from a slow-voltage generator 5 through memory key 6. Output Noe voltage from the test object 9 is detected and is input to the comparator 8, the state of which corresponds to the output of logical 1 if the input voltage lies within its window, and logical O if the input voltage is outside said limits. The width of the window of the comparator 8 is kept narrow, i.e. it can be assumed that logical 1 will be output only at a certain value of the input voltage. The occurrence of a logical 1 at the output of the comparator 8 closes the key with memory 6, which remembers the voltage from the generator of a slow voltage 5 and keeps it constant at the control input of the modulator 2. At the same time, 1 is given a command to the recording and control unit 4, which records the amplitude of the signal at the input of the object under study 9 and gives the command to change the frequency of the synthesizer 1. Then the process repeats. Thus, the measurement of the frequency response is carried out by the proposed device at a constant voltage at the output of the object under study and the dependence of the input voltage on the frequency of the acting signal is fixed. The proposed frequency response control device differs from the well-known wider field of application and high measurement accuracy, which will allow more objectively technical control of the parameters of manufactured products, as well as improve their quality. Claims. A device for automatic control of amplitude-frequency characteristics, a synthesizer and a modulator connected in series to register and control, as well as an amplitude meter, a slow-oscillator (aprons and a detector, differing from the fact that, in order to improve accuracy and enhance functional capabilities, , a two-threshold comparator and a memory key are entered into it, and the modulator output is connected to the device inputs and an amplitude meter, the output of which is connected to the input of the recording and control unit Nor, the output of the generator of a slow variable voltage is connected via a key with the memory from the control input of the modulator, the other input of the device through the detector is connected to the input of a two-threshold comparator, the output of which is connected to the control inputs of registration and control and the key with the memory. Sources of information taken into account in the examination T. Patent of Japan No. 51-34750, cl. 11 ITO, 19772. USSR Author's Certificate No. 752193, cl. G 01 R 27/28, 1980.