SU1091079A1 - Device for stroboscopic registering of periodic signals - Google Patents

Abstract

DEVICE FOR REGISTRATION stroboscopic periodic signals, comprising a reference voltage source, a first integrator, pulse generator, a sawtooth voltage generator, a first comparator, a monostable multivibrator, a second comparator, TI -trigger, differential limiting amplifier, a second integrator, low-pass filter and a two-coordinate a recorder, with the output of the first integrator connected to the X input of the two-coordinate recorder and the first input of the first comparator, and the input of the device through the driver l pulses and a sawtooth generator - with the second input of the first. a comparator, the output of which is connected via a one-shot vibrator to the synchronous input of the I) -trigger, the outputs of which are connected via the differential amplifier-limiter and the second integrator to the first input of the second comparator, the second input of which is connected to the input, the device, and the output to information input D -trigger, output (L of the second integrator through a low-pass filter is connected to the Y -input of a two-coordinate recorder, about T that, in order to improve the accuracy of the register, it is equipped with an analog key to two counters and the OR element, the counting inputs of the counters are connected to the one-shot output, and the higher-order outputs are with the own counting stop inputs and the inputs of the OR element whose output is connected to the control input from an analog switch connected between the output of the reference voltage source and the input of the first integrator, the inputs for setting the zero of the first and second counters are connected respectively to the inverse and direct outputs of the 1-trigger.

Description

The invention relates to electrical measuring equipment and is intended to record with increased accuracy periodic processes in a wide frequency range on a frequency two-coordinate register. A well-known device that allows us to observe and, if necessary, photograph non-sinusoidal and impulse processes from the screen of an electron-beam tube, is an electron oscilloscope. Oscilloscopes have high sensitivity and a wide band of transmitted frequencies fl. The disadvantages of the known devices are the low accuracy of measuring the amplitude of the voltage amplitudes, as well as the difficulty of obtaining photographs from the oscilloscope screen. Arrangements for strobe-sampling of periodic signals of arbitrary shape on a low-frequency two-coordinate recorder are known, which contain an electron-beam oscilloscope, whose X input is the device input, and the Y input through the first resistive voltage divider is connected to the input of the sampling and storage unit, and the horizontal scan output through the second resistive voltage divider connected to the first input of the comparator, the second input of which is connected to the output of the adjustable source of the reference voltage and an X input of a two-coordinate recorder, and the output through a single vibrator is connected to a control input of a sample and storage unit, the output of which is connected to a Y input of a two-coordinate recorder 2. The drawback of the device is a significant dynamic error that occurs (when registering rapidly changing processes, For example, pulses with steep fronts. The closest in technical essence to the invention is a device for stroboscopic recording, containing a source of reference voltage, the first integrator, which forms pulse generator, saw-voltage generator, first comparator, one-shot, second comparator J) -trigger, differential amplifier-limiter, second integrator, low-pass filter and two-coordinate recorder, the reference source being connected to the X-input via the first integrator two-coordinate recorder and the first input of the first comparator, the device input through the pulse shaper and the sawtooth generator - with the second input of the first comparator, the output of which is through one The ator is connected to the D-trigger's synchronous input, the outputs of which are connected via the differential amplifier-limiter and the second integrator to the first input of the second comparator, the second input of which is connected to the device input, and the output to the information input J) -trigger, the output of the second integrator connected to the Y input of the two-coordinate recorder GZ. A disadvantage of the known stroboscopic recording device is the low accuracy of registration of processes with steep fronts, due to the dynamic error due to the low rate of rise of the output voltage of the second integrator, and consequently, the voltage on the Y input of the two-coordinate recorder. The purpose of the invention is to increase the registration accuracy. I ... The goal is achieved by the fact that a device for stroboscopic recording of periodic signals containing a source of reference voltage, a first integrator, a pulse shaper, a sawtooth generator, a first comparator, a one-shot, a second comparator, a B-trigger, a differential limiting amplifier , the second integrator, a low-pass filter and a two-coordinate recorder, with the output of the first integrator connected to the Y input of a two-coordinate recorder and the first input of the first comparator, and the input of the device through the pulse shaper and the sawtooth generator is with the second input of the first comparator, the output of which is connected via a one-shot to the synchronous input of the B-flip-flop, the outputs of which through the differential limiting amplifier and the second integrator are connected to the first input of the second comparator, the second input of which is connected with the input of the device, and the output with the information input of the D-trigger, the output of the second integrator is connected to the Y input of the two-coordinate recorder via a low-pass filter the two-counter and an OR key, the counting inputs of the meters are connected to the one-shot output, and the higher-order outputs are connected to the own counting stop inputs and the OR element inputs, the output of which is connected to the control input of an analog switch connected between the output source of the reference voltage and the inputs of the first integrator, the inputs of the installation of the first and second counters of the first and second counters are connected respectively to the inverse and direct outputs of the D-trigger. This makes it possible to stop the slow saw during the registration of a steep front and to exclude the dynamic registration error. FIG. 1 is a diagram of the device stroboscopic registration; in fig. 2 - diagrams of formation of the output voltage. The source 1 of the reference voltage through an analog switch 2 and the integrator 3 is connected to the X input of a two-axis recorder 4 and to the first input of the first comparator 5, the device enters through a pulse shaper 6 and a sawtooth voltage generator 7 to the second input of the comparator 5 and its output through the single-vibration 8 to the counting input of counters 9 and 10 and to the synchronous input 1 of the trigger 11, the inverse and direct outputs of which are respectively connected to the inputs of the R-set zero of the counters 9 and 10 and through the differential amplifier-limiter 12 and second integrator 13 - to the first input of the second comparator 14, the second input of which is connected to the input of the device, and the output to the information input of the D-trigger 11, the output of the second integrator 13 is connected via a low-pass filter 15 to the V-input of the two-coordinate recorder 4, and the outputs of the higher bits of the counters 9 and 10 are with their counting stop inputs and the inputs of the OR 16 element, the output of which is connected to the control input of the analog switch 2. The device operates as follows. The voltage from the source 1 of the reference voltage through the closed analog switch 2 is supplied to the integrator 3, which produces a linearly increasing voltage Uf, (Fig. 2o). This voltage is supplied to the X input of the two-coordinate recorder 4 and to the first input of the comparator 5. The shaper 6 pulses, under the action of the input voltage supplied to the input of the device, output the pulses that follow the input voltage frequency, from which the generator 7 sawtooth voltage forms a fast saw U (fig. 26) and delivers it to the second input of the comparator 5. At the moment of equality of the voltages of a slow and fast saw, the comparator 5 forms a voltage drop, under the action of KOTOjporo the one-shot 8 produces a strobe The pulses Uj (Fig. 2b) both feed them to the counting inputs C of counters 9 and 10 and the sync input of C b trigger 11. The phase of the strobe pulses changes with respect to the phase of the input voltage and during the recording period the full period and the input voltage this change is 21g. At the same time, the Ug (Fig. 2) voltage is formed at the direct output of the .1 trigger 11, depending on the voltage level of its ti input, and the differential limiting amplifier 12 forms a voltage depends on the state of the 33i-trigger 11. Under the action of this voltage, the output voltage of the second integrator 13 UK is changed (Fig. 2), it is compared by the second comparator 14 with the input voltage (Fig. 2c) and the result of the comparison is applied to Jk input b-flip-flop 11. As a result, the output voltage of the second integrator 13 tends to take the value equal to the instantaneous value of the input voltage at the time of the strobe pulse action, and through the low-pass filter 15 it is applied to the Y input of the two-coordinate recorder Uu (Fig. 2b). If the voltage at the output of the second integrator U (Fig. 2) is approximately equal to the instantaneous value of the input voltage Ujjj (Fig. 2e), then counters 9 and 10 do not count

they melt, because for each second strobe pulse they are reset, and if this equality is violated, then after several strobe pulses, for example two, an output voltage appears at one of the counters, which opens an analog switch 2 through an OR 16 gate. and stops the slow saw, i.e. X sweep recorder. A slow saw is activated only when the output voltage of the second integrator is equal to the instantaneous value of the input signal at the time of the strobe pulse.

Thus, in the proposed device, the dynamic registration error is eliminated and it becomes possible to register rapid change of processes with increased accuracy.

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Claims (1)

DEVICE FOR STROBOSCOPIC RECORDING OF PERIODIC SIGNALS, (containing a reference voltage source, a first integrator, a pulse shaper, a sawtooth voltage generator, a first comparator, a one-shot, a second, a comparator, a b-trigger, a differential amplifier-limiter, a second integrator, a low-pass filter and a two-coordinate moreover, the output of the first integrator is connected to the X-input of the two-coordinate recorder and the first input of the first comparator, and the input of the device through the pulse shaper in and a sawtooth voltage generator - with the second input of the first comparator, the output of which is connected via a single-shot to the sync input of the D-trigger, the outputs of which are connected through the differential amplifier-limiter and the second integrator to the first input of the second comparator, the second input of which is connected to the input of the device, and the output is with the information input of the D-flip-flop, the output of the second integrator through a low-pass filter is connected to the Y-input of the two-coordinate recorder, about τη and that, in order to increase the accuracy of the register walkie-talkie, it is equipped with an analog key ^ two counters and an OR element, and the counting inputs of the counters are connected to the output of a single-shot, and the outputs of the higher digits are connected to their own inputs to stop the count and the inputs of the OR element, the output of which is connected to the control input of the analog key connected between the source output reference voltage and the input of the first integrator, the inputs of the zeroing of the first and second counters are connected respectively to the inverse and direct outputs of the b-trigger. "SU ..", 1091079.