SU1357848A1 - Device for calibrating fast scannings - Google Patents

Abstract

The invention can be used in oscillographic devices with information conversion into 1-digit form. The purpose of the invention is to reduce the distortion of the calibration signal and enhance the functionality of the device. The device consists of a control unit 1, a frequency divider 3, a vertical deflection unit 4 and a frequency meter 5. The introduction of a calibration signal generation unit 2, including a decoder 6, current keys 7.1, ..., 7.P, relatively unstable generators 8.1, ..., 8.p and keys 9.1, ..., 9.P, provides the ability to calibrate fast sweeps with an undistorted calibration signal with a repetition rate of 1 GHz or more. 1 il.

Description

The invention relates to a measurement technique and can be used in oscillographic devices with the conversion of information into digital form.

The purpose of the invention is to reduce the distortion of the calibration signal due to the mutual influence of simultaneously operating frequency division cascades, and to extend the functionality by enabling the calibration of fast sweeps with an undistorted calibration signal with a repetition frequency of 1 GHz or more.

The drawing shows a block diagram of the device.

The device consists of block 1 up25.

about current generators. Calibration signal generators are assembled according to the simplest and easily customizable three-point scheme, since the requirements for the generator operation stability are small.

The present device is used in a special C9-13 oscilloscope for calibrating fast sweeps.

thirty

(0.5; 1; 2 not / cases), therefore - the number

unit 2, the formation of the caliber-20 included in the supply chain of the corresponding signals, a frequency divider 3, a vertical deviation unit 4, a frequency meter 5, while the outputs of the control unit 1 are connected to the control inputs of the unit 2, the output of which is connected to the input of the unit 4 vertical deviation and the input of the splitter 3 frequency, the output of which is connected to the input of the meter 5 frequency. Block 2 contains a decoder 6, current keys 7.1j ..., 7.n, relatively unstable generators S.l, ..., 8.n, keys 9.1, ..., 9.n.

The device works as follows.

During calibration, the control voltage from the output of control unit 1 turns on one of the generators of block 2, for example, by turning on the power and the others are off, which ensures that there is no parasitic modulation of the calibration signal.

The output signal of the operating generator of the calibration signal generating unit 12 is supplied simultaneously to the inputs of the vertical deflection unit 4 and the divider 3 frequencies. Frequency divider 3 lowers the frequency of the calibration signal to a value that can be measured with frequency tolerance (0.1%) with a frequency meter 5, for example, with the use of a low-frequency crystal oscillator used for the general sync of all devices. in the device. From the output of the divider 3 frequency signal with a frequency reduced to

The individual oscillators are limited to three: 1 GHz, 500 MHz, 200.MHz. For calibrating slower sweeps, a conventional circuit is used with a 2g quartz oscillator 100 MHz followed by divisors, since for frequencies of 100 MHz and below, effective filtering is possible and Calibration signal distortion is unobserved.

In a specific implementation of the device, the frequency meter operates according to the filling principle, using a stabilized crystal oscillator (with a repetition frequency of the output signal of 1 O MHz), used for general synchronization of all devices in the device. In this case, the highest frequency of the number of frequencies obtained at the output of the calibration signal generation unit 2 must be reduced to a value not exceeding 10 kHz in order to ensure a frequency measurement accuracy of 0.1%.

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Claims (1)

Invention Formula A device for calibrating fast sweeps, containing a controllable value unit, is fed to the input of meter 5, where the frequency is measured, for example, according to the principle filling. At each moment in the calibration process, only one of the generators of block 2 is turned on, while the others are in the off state, which ensures, despite the fact that the outputs of the generators are connected to the same load, the absence of distortions of the calibration signal due to the passage of microwave frequencies constituents. The operation of the generators is controlled by applying the TTL levels obtained after decoding the control codes to the inputs of current amplifiers assembled according to the Darlington and generators. Calibration signal generators are assembled according to the simplest and easily customizable three-point scheme, since the requirements for the generator operation stability are small. The present device is used in a special C9-13 oscilloscope for calibrating fast sweeps. (0.5; 1; 2 not / cases), therefore - the number included in the circuit included in the circuit The individual oscillators are limited to three: 1 GHz, 500 MHz, 200.MHz. A conventional circuit with a 100 MHz quartz oscillator generator and subsequent dividers is used for calibrating slower sweeps, since for frequencies of 100 MHz and below, effective filtering and distortion can be achieved no calibration signal is observed. In a specific implementation of the device, the frequency meter operates according to the filling principle, using a stabilized crystal oscillator (with a repetition frequency of the output signal of 1 O MHz), used for general synchronization of all devices in the device. In this case, the highest frequency of the number of frequencies obtained at the output of the calibration signal generation unit 2 must be reduced to a value not exceeding 10 kHz in order to ensure a frequency measurement accuracy of 0.1%. 55 Invention Formula A device for calibrating fast sweeps, containing a control unit; 31578484 No, a frequency divider, a verti-da block and a series of relatively unstable oscillation deviation and an hour-generator meter, with the decoder inputs, the cable of which is connected to the output of the frequency divider, about m and h -lens, the outputs of the decoder through the current so that, in order to reduce the amplifiers - with the control inputs of the distortions of the calibration signals corresponding to bear and extend the functional oscillations of the generators, the outputs of which , a block is entered into it through current amplifiers connecting the calibration signals, co-in with the inputs of the vertical block holding the decoder of the control deviation and the input of the frequency divider.