SU392413A1 - STROBOSCOPIC CONVERTER FOR OSCILLOGRAPH - Google Patents

Description

one

The invention relates to a measurement technique, namely to oscillographic instruments.

A oscilloscope strobing converter is known, comprising a delay line, a mixer, a strobe generator, a saw voltage generator and a step voltage generator.

In order to increase the signal-to-noise ratio at the output of the converter, the proposed device includes a cumulative filter, a solver, its device and a frequency divider.

The drawing shows the block diagram of the proposed Converter.

The converter contains a synchronization unit 1, a delay line 2, a mixer 3, a sawtooth voltage generator 4, a comparison circuit 5, a step voltage generator 6, a gate pulse generator 7, a frequency divider 8, a cumulative filter 9 and a device;

The analyzed signal t / Ex (0 simultaneously enters the block 1 synchronization and through line 2 of the delay to the mixer 3.

The synchronization unit generates a trigger pulse, which depends on the parameters of the input signal, which is fed to the 4-saw voltage generator. The linearly varying voltage of the generator 4 is fed to the comparison circuit, where it is compared with the output voltage of the 6-step voltage generator. At the moment of equality of the output voltages of the generators 4 and 6, the circuit 5 generates a pulse, which is fed to start the generator 7 of the gating pulses and through the frequency divider to the generator 6 to form the next voltage level. In this case, the generator 7 forms a short gating pulse controlling the operation of the mixer.

The step voltage generator will receive an increment of voltage at its output only through n generator pulses 7

(n is the division factor of the frequency divider), which leads to a shift of the nth gate pulse.

Consequently, n generator pulses 7 will coincide in the mixer with the same

point of the investigated signal.

This series of n pulses, whose amplitude is proportional to the value of the signal under study at the point at which the gating pulses act on it, from the output of the

the filter is fed to a collection filter.

As a result of the action of a series of pulses on an accumulative filter, the ratio of the useful output signal to noise will be much larger than the same output.

filter.

Solver will limit noise.

Thus, the output will be information about a specific point of the signal under study with a significantly reduced random component, amplitude to it, which allows to increase the sensitivity of the device.

Circuit cumulative filter and frequency divider are known. The decisive device can be, for example, a conventional diode limiter.

If block 1 operates in the frequency division mode of the signal under study, then to reduce the time required for obtaining useful information, divider 8 can be eliminated, and between the strobe generator and the mixer, a series of pulses with a period of pulses can be turned on. .

A variant of the operation of the device is possible when the synchronization unit operates in the self-oscillating mode and with its pulses starts the object under study. Then line

delays are excluded. It is also excluded if there is a trigger signal that is rigidly associated with the signal under investigation.

Subject invention

An oscilloscope stroboscope converter containing a delay line and a mixer, to the second input of which a signal was sent from the gating pulse generator, a comparison unit, to one of the inputs of which a signal was sent from the sawtooth voltage generator, and to the second input a signal from the voltage driven generator, the output of the mixer is connected to the input of the generator of gating pulses, characterized in that, in order to increase the signal-to-noise ratio at the output of the converter, the output of the mixer is connected in series s filter and storage device makes the difference, and between the output of the comparison unit and the input voltage step generator frequency divider included.

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