SU509835A1 - Strobe Oscilloscope - Google Patents

Description

one

Ieobretenne about-gaosnts to electrical equipment with the help of technical equipment, can be used to track the accuracy of stroboscopic oscillographic meters of nanosecond time intervals. Known stroboscopic | The oscillograph contains two stroboscopic mixers, the second inputs of which are connected to the output of the generator of strobes; pulses, and the outputs through amplifiers with .nepBbUv H into the input and two radiation cathode ray tube, the third input Usable to the sweep generator, oinhrojlnnator, which is connected to the {input of the first mixer, and the duration normalizer,

; The purpose of the invention is to improve accuracy; time interval measurements. ; The proposed oscilloscope is characterized in that it is equipped with a lower icTOT filter, a frequency-voltage converter, an adder controlled by a generator, and digital counting and separation (differential frequency) units, the first inputs of which are connected to the output

generator connected to the input of the adder, the first input of which is connected via a frequency-voltage converter and a low-pass filter to the synchronizer output, and the second to the output of a normalizer of duration, the inputs connected to the outputs of amplifiers, and the output unit of the junction of the frequency is connected with the output of the low-pass filter, 0 and the output with the inputs of the digital counting unit and the sweep generator.

Diagram of the device shown in drawing-g

same.

The oscilloscope consists of stroboscopic mixers 1, 2, synchronizer 3, low pass filter 4, frequency-voltage converter 5, block you. dividing the difference frequency 6, adder 7, controlled voltage gnneratog0 | pa 8, the driver of strobe pulses 9, i amplifiers 10, 11, normalizer dpatnitsy 12 in the form of a converter I duration-voltage, block digital / 13, generator 13, sweep generator 14

1N double beam electron beam tube 13.

; The device works as follows.

The first input signal is fed to the inputs of the mixer 1 and the synchronizer 3 ,; wherein the repetition frequency of the input signal is divided by a specific number i times. The output of filter 4, which passes only the first harmonic j of the divided signal, is applied to the inverter's frequency-constant voltage 5 and differential frequency selection block 6. The voltage of the converter 5 to the generator input tJ sets the frequency of this generator

/ - A.-F p. M m

where ff is the input repetition frequency

signal;

m is the division ratio of synchronizer 3; y - given low constant

frequency.

The sequence of short strobe lights, formed in the driver 9 from the signal generator 8, is sent to mixer 1. Since the frequency is repeated. Since strobe pulses are set from units to tens of megahertz, then mixer 1 is used in peak detection mode. The amplified output voltage of the mixer 1 is fed to the inputs of the tube 15 and the normalizer 12. The voltage of the normalizer 12 controls the frequency of the generator 8 and thereby the ratio of the time scale transformation so that the output signal of the mixer 1 always has a predetermined 1 iteration of a certain segment. regardless of the length of the input; squad--; count

The frequency of the generator 8 is adjusted so that the duration of the transformed normalized interval is equal to the reference normalized duration.

The sinusoidal output signal of the generator 8 is mixed in the difference frequency selection block 6 with the output signal of filter 4, the difference frequency signal is also output there, which is fed to the inputs of the digital reference block 13 and the sweep generator 14. When measuring the duration of the difference frequency period in block 13, use -; counting pulses with a period equal to the period of following the strobe pulses, we obtain the readings of the counter:

T /

 ,

StofOf

where Q is the established coefficient

time-scale transformations: ba,

and dispel the value of the measured time e | variable interval:. Ace

from (}

 When measuring the time intervals between two sequences of pulses, the second input signal is fed to mixer 2. The converted and amplified signal is fed to the tube 15 and the normalizer 12, which is then used to set the duration of the measured time interval.

Formula Invention

A stroboscopic oscilloscope containing two stroboscopic mixers, the second inputs of which are connected to the output of the strobe pulse former, and the outputs through amplifiers to the first and second inputs of a two-beam electron tube, the third; an input associated with, a sweep generator, a synchronizer, whose input is connected to the input of the first mixer, and a duration normalizer, characterized in that, in order to improve the accuracy of measuring time intervals, it is equipped with a lower filter, frequency converter, summator, control A snake generator and blocks of 4f and reference and separation of the difference frequency, the first inputs of which are connected to the output of the controlled oscillator, the input connected to

with the output of the adder, the first input of the junction through the converter; d the frequency-voltage and the low-pass filter is connected to the output of the synchronizer, and the second to the output of the duration normalizer,

inputs bv hvn1ch from the output of the amplifiers, f and the input of the differential difference frequency selection block is connected to the output of the low-pass filter and the output is connected to the inputs of the 11ifr counting block; and the generator / p