SU109767A1 - Instrument for taking amplitude characteristics and measuring nonlinearity of pulse circuits - Google Patents

Description

In the practice of research work with iiacTpoiiKe of various kinds of radio engineering devices, it is often necessary to remove the amplitude characteristics of video speakers, different pulse circuits, etc. The amplitude characteristic is taken by the method of obtaining C) t;,, e, ty points, i.e. The impulse voltage at the input of the circuit is set and the corresponding impulse nanowheHie is measured at the output of the circuit. The number of such measurements for the removal of one ammunition is one depends on a given degree of accuracy and number of tables within a range of 10-30 and more, even an experienced operator takes at least 45 minutes, and the measurement accuracy does not exceed 3-5; ;.

The device is offered, allowing us, iG | to automate the removal of the amplitude characteristics in a large dynamic range, i.e., to practically reduce this process to the circuit under study, to the instrument and to observe the amplitude characteristics (nonlinearity reading) of the circuit under study on the screen of the device's cathode-ray tube. Thus, the time taken to remove amplitude characteristics (time to measure nonlinearity) of pulse circuits is reduced tenfold, the accuracy of measuring their nonlinearity is improved, and the possibility of direct dialing of the performance characteristic is obtained when replacing various elements of the circuit under study.

In addition to this, a poorly sized device, if necessary, can be supplemented with a modulator that converts video pulses into radio frequency pulses, and, of course, it is used to tune and increase the frequency of the GW frequency.

The device (see, 1) consists of a front part, a reception part, an auxiliary circuit, a meter, and can work both in the mode of removing the amplitude characteristics and evaluating the nonlinearity of the circuit, as well as in the mode of non-linearity.

A pulse voltage is applied to the input of the device (see, fig. 2, plot /). In the transmitting part, the pulses are amplified, limited, modulated according to a simple law and fed to the output of the device to which the iKC circuit is connected. (Fig. 2, plot 2). From the output of the ignition circuit 1 1 and its voltage, which has a bend around it in accordance with its amp / 1 characteristic (Fig. 2, plot 3), feed the input // of the device (Fig. 1). The device operates in two modes - to remove amplitude characteristics and to measure the nonlinearity of the circuit under study.

When working in the mode of these amps of the characteristics, when the volumes of the treasure P and P are open, this behavior increases, if the max. T1) Other, meiigue 80 V, the Heinio is converted by a.militude ((5ИГ. 2, plot 4) and is supplied to the inlet, Thiost.O.d.t. of the electron-learning tube. On the horizon, пio (the expansion plates are drawn, and the contour, in the form of a repeated tension, shown in Fig. 2. As a result of the raising of these two ia gairiii an electron beam in an electron-trache tube, which is illuminated only for the duration of the action Versh impu; 1sov, draws in vi.te amplitude characteristic points iss.teduemo circuit.

In the mode of measuring the ieliiaiity of the circuit, the pressure taken from the circuit under study is compared with the voltage applied to the circuit under study, for which the Pzamye toggle switch is used. The result of the comparison, which depends on the degree of linearity of the schema (for a part of the actual circuit, is equal to the bullet), is amplified and fed to the vertical-deflecting plates of the electron-tube tube, the scale of which is graduated as a percentage. Since, in this mode, on the screen of the electron beam tube is observed: 1, only the result of the comparison is present, the accuracy of the reading of the electronic device and the razrenga ability of the device can be

high at sravniteL1) Io small screens of tubes (for example 13L037 or 8LOZO).

The auxiliary circuit generates a control voltage dt transfer and the receiving part (modulating voltage, voltage controlling distributions) and a backlight voltage for an electron-trache tube.

The instrument also detects the consistency of the circuit under study. Since the screen size is required to determine the voltage quite clearly, the magnitude of the gain entered into the reception part and the magnitude of the voltage applied to the input of the circuit under study can be judged on the gain of the circuit O1.

Tu.bler I | The test is performed when checking the calibration of the instrument. When this tumbler closes, and the input from the output of the transmitting part of the instrument input device // is used, the position of the reference points on the scale of the baler can be checked.

Subject invention

A device for taking amplitude characteristics and measuring pulse and pulse circuits, which differs from the fact that the input of the circuit under study is energized from a pulse generator, whose amplitude varies according to the sawtooth law, and when the voltage characteristics are removed from the input and output circuits of the iodine to the horizontally and vertically deflecting electrodes of the oscilloscope, and when the nonlinearity changes, to the comparison circuit.

FIG. 2