SU1394147A1 - Stroboscopic oscillograph with automatic correction of scanning non-linearity - Google Patents

Abstract

The invention relates to radio measurements and can be used in oscillography, the invention makes it possible to reduce measurement errors of time intervals and to reduce the time for auto calibration. To do this, a control key 8 is additionally entered into the device. The device also contains a comparator 1, a generator 2 fast sawtooth voltage, a digital-analog converter 3 sweeps, a meter 4 time intervals, a stroboscopic converter 5, a calculator 6, a synchronizer 7. The whole process The device is divided into two phases: automatic calibration of the I-measurement. When the device enters the measurement mode, the calculator 6 blocks the controlled key-8, which does not pass the signal of the meter 4 to the start of the synchronizer 7. At the same time, the third input of the synchronizer 7 receives a signal allowing its start. The calculator is designed to control the overall operation of the device and the execution of the correction algorithm. 2 Il. § W

Description

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figure 1

I The invention relates to a radio measuring technique and can be used in oscillography.

I The aim of the invention is to reduce the error in measuring time intervals, reducing the auto-calibration time.

FIG. L is a block diagram of the proposed device; in fig. 2 - diagrams on the operation of the device.

Stroboscopic oscilloscope with automatic nonlinearity correction

The scan gig contains comparator 1. fast sawtooth voltage generator 2 (VPN), digital-to-analog converter (IJAIl) 3 sweeps, 4 time intervals meter (IVI), stroboscopic converter 5, calculator 6, synchronizer 7, control key 8, the first input of comparator 1 is connected to the generator output 2 VPN, the second input - to the output of the DAC 3 sweep, and the output to the i input of the IVI 4 and the second input of the strobosko Ipichesky transducer 5, the first I input of which is connected to the bus of the studied I signal. The first input of the key 8 I is connected to the first output of the compute: l 6, the second input to the first output of the IVI 4z and the output to the second input I of the synchronizer 7, the first input of which is connected to the bus of the synchronized signal, the third to the the first output of the calculator 6, and the output to the input of the generator 2 BPN. The second output IVI 4 is connected to the code of the calculator 6, the second output of which is connected to the input of the PAP 3 sweep. The control key 8 can be performed both on electromechanical elements (reed switches, relays) and electronic elements (microchips, transistors).

The device works as follows, it ....

The purpose and principle of operation of the comparator 1 of the generator 2 BPN, DAC 3 sweep, the stroboscopic converter 5, as well as the principle of the stroboscopic conversion of signals are quite similar to those considered in the known oscilloscope.

The whole process of work is divided into two phases; automatic calibration and measurement.

During the calibration phase, the oscilloscope operates as follows:

0

five

0 5 0 0

five

The triggering signal is from the first output of the IVI 4 through the key B to the second input of the synchronizer 7. In this case, the control signal from the first output of the calculator 6 allows the first input of the key 8 to pass the trigger signal from the second input of the key 8 to the second input of the synchronizer 7. The same control signal, which arrives at the third input of synchronizer 7 via the bus of the synchronizing device, blocks the start of synchronizer 7 (the first input of synchronizer 7). The first output of the IVI 4 generates a trigger signal (Fig. 2), synchronous with the reference frequency (Fig. 2), used to determine the duration of the time interval between the start of the synchronizer 7 and the coincidence time of the BPN and SPN on the Koi charmer 1 (Fig. 2) . Then, at the moment of coincidence of the amplitude of the VLR and SPV (Fig. 2), the comparator ejects a pulse that enters the input of IVI 4. This pulse triggers the interpolator in IVI 4, which forms a pulse sequence with a repetition period

t T

m N.

Thus, at the input of the calculator 6, through the IVI 4, two numbers N1 and N0 are received via a multi-bus. The calculator b determines the duration of the measured time interval by the formula

T, TjN0--5iiNll.

The calculator 6 compares the obtained time interval values with. . support corresponding linearly. changing vpn. As a result of the comparison, a correction code is developed, which makes it possible to reduce the difference between the reference and measured time values to zero. This code enters the input of the DAC 3 sweep and is used in the measurement mode. When the device enters the measurement mode, the calculator 6 blocks the control key 8 and the latter does not transmit the IVI 4 signal to start the synchronizer 7. At the same time, the third input of the synchronizer 7 receives a signal allowing it to start from the first input, i.e. sync signal. The calculator is designed to control the overall operation of the device and the execution of the correction algorithm.

Claims (1)

Invention Formula A stroboscopic oscilloscope with automatic correction of nonlinearity of the sweep, containing a comparator, the first input of which is connected to the output of the fast saw-out generator of which is connected to the second output of the time interval meter, and the second output to the input of the digital-analogue converter of the sweep, to the synchronization signal bus, and the output to the input of a fast sawtooth generator, characterized in that, in order to reduce the measurement error of the times s intervals, rhenium calibration process, it introduced a controllable switch having a first input voltage, the second to the output of the digital-to-analog converter, a scanner bgo is connected to the first output ki, and the output is connected to the input of the time meter, and the second input is to the first intervals and the second input of the time interstroboscopic converter, shafts, output - to the second input, the synch input, the first input of which is connected to the driver, the third input of which of the input signal, the calculator, 20 is connected to the first output of the calculator. Hall 1 / s / {cuwpow3ff / 77o / a 0 the input of which is connected to the second output of the time interval meter, and the second output - to the input of the digital-analog converter of the scan, and the synchronizer, the first input of which is connected to the synchronization signal bus, and the output - to the input of the fast sawtooth voltage, characterized by that, in order to reduce the measurement error of the time intervals, the calibration process, the control key is entered into it, the first input 5 Bgo is connected to the first output of the voltage source, and the second input is connected to the first output of the time interval meter, the output is connected to the second input of the synchronizer, the third input of which is connected to the first output of the calculator. {„C / 77ar / 7 /) Coef7ffdef / t / e Lc / 770/7) r g 2