SU561140A1 - Strobe Converter - Google Patents

Description

one

This invention relates to electrical measuring technology and can be used in stroboscopic oscilloscopes.

Known stroboscopic converter containing a mixer, a generator of strobe pulses, an adder and a digital-to-analog converter.

This device has a narrow bandwidth and low sensitivity due to the noise of the mixing diode and impedance usipigep.

Closest to the proposed stroboscopic converter, in which, in order to increase the sensitivity without degrading the broad power of the converter, an excitation circuit is connected to the mixer output, inductively coupled to the input of the amplifier.

A disadvantage of this device is the instability of operation due to the synchronization of pulses in a bundle with radio pulses.

The purpose of the invention is to ensure stable operation with high sensitivity and increased accuracy - achieved

due to the fact that the stroboscopic converter containing the CTJJO6HNmynbcoB generator, the input of which is connected to the flow path of the scanner, and the output is "the first input of the mixer, the second input of which is connected to the input of the converter, and the output is supplied with a threshold device, reversible counter, counter control unit and digital-to-analog converter, the output of which is connected to the third input of the mixer, and the inputs - to the back-up counter moves, the counting input of which is connected through Ogove ustroy- tvo a yield enhancer, a control input - output control unit with a counter having a first input coupled to house the amplifier and the second input - to the output scanner.

The structural electrical circuit of the device is shown in the drawing.

The device consists of a generator of strokes 1, a mixer 2, a hit shock P1 OHO excitation 3, an amplifier 4, a sweep 5, a threshold device 6, jjever C4e; -1I1 -.: 7, 6; ioK.a 8 uraplennnu counters and qi | || p; -a -1log converter 9.

The device operates as follows: Generator 1: Strobimuyuschet 1 is processed, the period of its follow-up, which is determined by the period of pulses with a synchronized pulse. arriving at generator 1 from scanner 5. Strobe pulses go to mixer 2, where they open mixing diodes, wired in a symmetrical pattern. The current pulses passing through the diodes with symmetry on the diodes and the zero signal under study at the input of the mixer and the feedback voltage supplied through the feedback loop from the digital-analog converter 9 are equal and opposite in HcVipaBj; eHirro , as a result, there is no voltage on the shock excitation circuit 3. The output voltage of the digital-to-analog converter is determined by the state of the flip-flops in the reversing counter 7 n at the initial time may be different from zero, if the circuit is not provided, the automatic installation of the counter 7 to the position corresponding to zero voltage at the DAC output.

Upon arrival at the input of the mixer 2 of the signal under study, a radio pulse arises on the shock excitation circuit 3 with a positive or negative half-wave in the first period, depending on the polarity of the input signal, and amplitude proportional to the magnitude of the input signal at the read point. This radio pulse through amplifier 4 enters the threshold device 6. At the output of the threshold device, rectangular pulses are formed) which arrive at the input of the reversible counter 7, With a sufficiently high frequency of filling the radio pulse and a low threshold of the threshold device, the number of pulses received at the counter 7 is pulsed amplitude radio impulse From the counter, information in binary code is fed to a digital-to-analog converter 9, the output of which generates a constant voltage, with optimal adjustment of the converter, the equal amplitude of the signal under study at the input of the mixer at the read point.

If the amplitude of the input signal is constant, there is no radio pulse at the second Crush. Counter state 7. and the voltage at the output of the DAC does not change. In the case of a change in the input signal during each gating, new radio pulses appear, the amplitude of which is npoHopmioiia.ii.iiii pi.ioKucTii by the values of the input signal in the PC and the previous reading points. Thus, the output voltage UAila 9 monitors the magnitude of the signal under study at the read points, and the output of the counter 7 contains information about this value in the parallel binary code, which can be used for secondary processing on a digital computer.

If the voltage at the output of the DAC 9 at the initial time is not zero, the transient process ends with a maximum of two gating periods (assuming 5 optimal loop gain),

The unit 8 is used to recognize the polarity of the first half-wave of the radio pulse and generate a control napr 8 that changes the counting direction

reversible counter 7, and for dividing the polarity of the first half-wave of a radio pulse, the fact of its strict coincidence in time with the sync-pulse is used.

The use of a threshold device, a reversible counter and a DAC allows to significantly increase the frequency of filling the radio pulse (up to 10 MHz and more) and, weakening the effect of the flash-receiver noise, significantly increase the sensitivity of the converter without impairing its broadband. The use of digital processing improves the accuracy of the converter and facilitates fault diagnosis. Availability

Information about the magnitude of the signal under study at the reading points in the digital code allows the converter to be connected to a digital computer or a specialized microprocessor without an additional analog signal converter.

The linearity requirements of the amplifier over the entire dynamic range of the input radio pulses can be significantly reduced and be performed only in a narrow range, when the output voltage of the amplifier is close to the threshold of the threshold device.

Claims (1)

Invention Formula Strobe converter containing strobe pulse generator, input which is connected to the output of the scanner, and the output to the first input of the mixer, the second input of which is connected to the input of the converter, and the output through the circuit of the shock excitation - to the amplifier, o t, liable for the sake of provide stability {) operation with FAST chuvsgvntelygasgi and increased accuracy, it is equipped with a threshold device, reversible counter, counter control unit and digital-analog converter, the output of which is connected to the third input of the mixer, and the inputs - to the outputs reversive counter, counting 1.1 in); MII POG is connected via a threshold ycri-iMk-mo with an amplifier output, and utgravltop:;:;; ., xo; IC with the output of the control unit to the pickers, the first input of which is connected to the BGNHO / UM amplifier, and the second input from the output is TM i.). i; n;: i sweep. L.  f chi rooh ffodf