SU1040447A1 - Acoustic well-logging device - Google Patents

Abstract

A DEVICE FOR ACOUSTIC WIRING OF A WELL, containing a downhole tool consisting of an emitter and a receiver of acoustic oscillations, an electronic unit for excitation, an emitter, forming a synchro-. pulse amplification of receiver signals: ika, as well as wireline cable and ground panel consisting of a filter, preamplifier, analog switch, shaper-pulser, clock generator, peak generator, detector, comparator, RV-trigger, generator of counting pulses , the log-t of the check circuit And, the generator speed, the voltage of the buffer memory block, the digital-analog converter and the recorder, the output of the downhole tool is connected via a logging cable to the input of the filter, the output of which is connected to the input of the Pre-amplifier, pre-output. the amplifier is connected to the input of an analog switch, the first output of the synchronous generator is connected to the reset input of the peak detector, the second output of the synchronous generator is connected to the reset input of a stepwise generator; the third output of the synchronous generator is connected to the input of the gate strobe generator, the output of which is connected to the control input analog key., the output of the peak detector is connected to the first input of the comparator, to the second input of which the analog output of the step voltage generator is connected, The output of the RS-trigger is connected to the first input of the logic circuit AND, to the second input of which the counting pulse generator is connected, the output of the logic circuit AND is connected to the counting input of the step voltage generator, the code output of which is connected to the information input of the buffer memory block, the output of which is connected to (L input of a digital-analogue converter, which is characterized by the fact that, in order to expand its functionality by measuring the ratios of the amplitudes of different half-periods of acoustic oscillations with in the ground panel, an inverting amplifier, a SECOND analog switch, a signal adder, a second strobe pulse generator, an OR logic circuit, a reference voltage source, a switch, a second and a third logic circuit And, a second block of buffer memory and a second analog converter, and the input of the inverting amplifier is connected to the output of the preliminary amplifier, the output of the inverting amplifier is connected to the input of the second analog switch, the outputs of both analog switches are connected to the inputs of the adder C gables, the output of which is connected to the input of the peak detector, the input of the second strobe pulse former ... is connected to the fourth output of the clock generator, to which the control input of the switch and the first input are also connected

Description

And, the output of the second strobe pulse generator is connected to the control input of the second analog switch and the first input of the OR logic circuit, to the second input of which the output of the first strobe pulse generator is connected, the output of the OR circuit is connected to the S input of the trigger, R - the RS trigger input is connected to the comparator output, to which the second input of the second logic circuit AND and the first input of the third logic circuit AND are also connected, the second input of the third logic circuit AND is connected to the third output of the generator sync, the output of the second oh logical circuit AND connected to the control input

the first block of the buffer memory, the output of the third logic circuit I is connected to the control input of the second block of the buffer memory, whose information input is connected to the code output of the step voltage generator, the output of the second block of the buffer memory is connected to the input of the second digital-analog converter, the output which is connected to the first input of the recorder, the output of the first digital-to-analog converter is connected to the second input of the recorder and the second input of the switch, to the third input of which the source is connected voltage, and the output is connected to a step voltage generator.

The invention relates to field and geophysical studies of oil and gas wells, in particular, to acoustic logging equipment of cased and uncased wells, and solves the problem of increasing the research efficiency by determining the magnitude of the ratio of the amplitudes of acoustic signals during acoustic logging. Apparatus for measuring amplitudes in acoustic logging are known, comprising an emitter and receivers of acoustic signals, an amplifier, a circuit for separating the first incoming signals (for example, a selector), and a transducer that converts the amplitude of the first phase of the signal oscillations into a rectangular pulse width or constant current 2. These devices have a small dynamic range, low accuracy of amplitude measurement and do not allow measuring the magnitude of the ratio of the amplitudes of the different oscillation phases of the recorded acoustic signal. Acoustic logging equipment is well-known, which contains a borehole device with a three-element probe, consisting of emitters and receiver excitation current generators, polar selectors, amplifier and filters, as well as a ground-based device consisting of amplifier, switches, co-circuits, synchro-generator, peak detectors, narrowband filters, differential circuits and a recorder 3. This equipment makes it possible to measure the amplitude of the acoustic signals, but at the same time it has low speed and insufficient accuracy and does not allow to measure the value of the ratios of the amplitudes of the different phases of oscillations of the acoustic signal. The closest to the present invention is an acoustic well logging device comprising a downhole tool consisting of a radiator, acoustic receivers, an electronic unit for exciting a radiation layer consisting of a TOKOBHX pulse generator, a polarizer and an amplifier, as well as a logging cable and a ground panel consisting of a filter, a preamplifier, a discriminator of different-polarity pulses, an analogue amplifier, a strobe pulse former, a peak-clock synchro-generator, t Ex one-shot short pulses, a comparator RS-trigger, a generator of counting pulses, logic AND, a step voltage generator, a buffer memory block, a digital-analog converter, a nonlinear filter and a recorder, the output of the downhole tool is connected via a wireline cable to the input of the filter, the output of which connected to the input of the preamplifier, the output of the preliminary amplifier is connected to the input of the analog switch, the first output of the clock generator is connected to the reset input of the peaks of its detector The second output of the generator generator is connected to the fault input of a step voltage generator, the third output of the synchro generator is connected to the input of the strobe pulse generator, the output of which is connected to the control input of the anchor switch, the output of the peak detector is connected to the first input of the comparator, the second input of which is connected to the analog input the output of the generator of the step voltage, the output of the R5-flip-flop is connected to the first input of the logic circuit AND, to the second input of which the generator of the counting pulses is connected to the output log eskoy AND circuit is connected to the count input of oscillator stepwise voltage code output which is connected to data input buffer memory unit whith whose output is connected to the input of the digital to analog converter. The step voltage generator consists of a binary sequential asynchronous counter, NAND logic gates with open collector outputs, an R-2R resistor matrix, and transistor current stabilizers. o The device works as follows. Under the influence of a powerful pulse from the Current Pulse Generator, the emitter of the downhole tool generates elastic oscillations that, propagating in the well, reach the receivers that convert the acoustic signal into an electrical analog. This electrical signal, amplified by an amplifier, enters through a wireline cable into the ground measurement panel. At the moment the emitter driver triggers, the multi-polar pulses of the downhole tool generate positive and negative pulses, which are mixed with the signal of acoustic logging in amplification and with it arrive at the top of biocTb into the ground panel. The total signal after the passage of the FILE of the ground panel and the amplifier amplification of the panel enters the discriminator of different polarity pulses forming the synchronization pulses supplied to the synchro-generator. The synchronous generator generates start-cycle pulses, which reset the peak detector and the step voltage generator to the zero state. This pulse triggers a pulse gate formation circuit that generates a pulse equal to the duration of the first half-cycle of the acoustic card signal. The pulse of this driver opens an analog key, which passes only the first half-cycle of the signal to the peak detector. The accumulator of the peak detector is charged to the voltage equal to the amplitudes of the peak signal. the first half period of the signal, and further during the cycle. the voltage from the peak detector begins to discharge. steps on one of the inputs of the comparator. A voltage is applied to the other input of the comparator from a step voltage generator. At the moment of two voltages, the generator stops working with a pulse from the comparator, and the code from the counter of this generator is transferred to a block of buffer memory to the output of which a digital-to-analog converter is connected, converting the amplitude value of the acoustic signal to direct current voltage. This voltage goes through the non-linear filter to the recorder 4j. This device, in comparison with others, allows essentially comprehending the speed and accuracy of measuring the amplitudes of recorded signals during acoustic logging of wells, however, it does not allow to measure the value of the ratio c1 amplitudes of different phases (half-periods) of oscillations of acoustic signals. As a result of modeling work, as well as borehole studies, it was established that the ratio of the amplitudes of the various half-periods of the acoustic signal carries additional information about the properties of the media intersected by the well. For example, for an acoustic probe of the CMSA-2 instrumentation, when monitoring the quality of casing cementing, the ratio K of the amplitude A2 of the second half period of an acoustic signal propagating through the column to the amplitude A of the first half period of this signal varies from 1 to 4. At the same time, the uncemented intervals as well as areas with micro gaps between the casing and the cement stone, are characterized by the value, and the qualitatively cemented areas are k: 1 "In the range of values K 1-3, the value of K linearly depends on the size def cementing angle of vertical channel in cement stone). The purpose of the invention is to enhance the functionality of an acoustic logging tool by measuring the amplitude ratios of the various half cycles of the acoustic signal. This goal is achieved by the fact that in an acoustic well logging device containing a well, a device consisting of an emitter and a receiver of acoustic oscillations, an electronic unit for all excitation. emitter, sync pulse shaping and receiver signal amplification, as well as a logging cable and ground panel consisting of a filter, a preamplifier, an analog key, a strobe pulse generator, a synchro generator, a peak detector, a comparator, an RS trigger, a counting pulse generator And a logic circuit, a step-by-step generator, a buffer memory block, a digital analogue converter and a recorder, the output of the downhole tool is connected through a logging cable to the input of the filter, the output The torus is connected to the preamplifier input, the output of the preamplifier is connected to the input of the analog switch, the first output of the synchronizer is connected to the reset input of the peak detector, the second output of the clock is connected to the input input of the step voltage generator, the third output of the clock is connected to the input of the strobe pulses, the output of which is connected to the control of the input of the analog switch, the output of the peak detector is connected to the first input of the comparator, to the second input of which is The analog output of the step voltage generator is connected, the output RS of the trigger is connected to the first input of the logic circuit I, to the second input of which the counting pulse generator is connected, the output of the logic circuit I is connected to the counting input of the step voltage generator whose code output is connected to the information the input of the buffer memory block, the output of which is connected to the input of a digital analog converter, also contains an inverter amplifier, a second analog switch, a signal adder, on the panel surface, The second strobe pulse shaper OR logic, reference voltage source, switch, second AND third AND logic, second buffer memory block and second digital-to-analog converter, the input of the inverter amplifier is connected to the output of the preamplifier, the output of the inverting amplifier is connected to the input the second analog key, the outputs of both analogue keys are connected to the inputs of the signal adder, the output of which is connected to the input of the peak detector, the input of the second driver CRT The pulses are connected to the fourth output of the synchronous generator, to which the control input of the switch and the first input of the second logic circuit AND are also connected, the output of the second strobe pulse generator is connected to the control input of the second analog key and the first input of the logic circuit OR, to the second input of which the output of the first strobe pulse generator is connected, the schegAm OR gate is connected to & the input of the pS-flip-flop, R -input of the RS-trigger is connected to the output of the comparator, to which the second input of the second logic circuit I and the first input of the third logic circuit I are also connected, the second input of the third logic circuit I is connected to the third output of the clock generator, the output of the second logic circuit AND circuit is connected to the control input of the first block of the buffer memory, the output of the third logic circuit AND is connected to the control input of the second block of the buffer memory, the information input of which is connected to the code output of the step voltage generator In addition, the output of the second buffer memory unit is connected to the input of the second digital-to-analog converter, the output of which is connected to the first input of the recorder, the output of the first digital-to-analog converter is connected to the second input of the recorder and the second input of the switch, the third input of which is connected to the reference voltage source, and the output is connected to step voltage generator. Figure 1 shows the block diagram of the device; figure 2 - timing charts of the device. The device contains a downhole tool 1 consisting of an emitter 2, a receiver 3 of acoustic signals and an electronic unit 4 for exciting the emitter, generating sync pulses and amplifying receiver signals, as well as a logging cable 5 and a ground panel 6. The downhole tool 1 is connected to the input of the filter 7 of the ground panel 6 by means of a logging cable 5. The casing of the panel b contains a filter 7, a preamplifier 8, a clock generator 9, the first analog switch 10, an inverting amplifier 11, the second analog switch 12, the first generator stator 13 strobe pulses, second shaper 14 strobe pulses, sumg / 1ator 15 signals, peak detector 16, comparator 17, logic circuit OR 18, RS-trigger (i9, first logic circuit AND 20, oscillator 21 counting pulses, generator 22 step voltage p the first buffer memory block 23, the second buffer memory block 24, the first digital-to-analog converter 25, the second digital-to-analog converter 26, the second logic And 27, the third logic And 28, the source 29 of the reference voltage, the switch 30 and the recorder . The step voltage generator 22 consists, for example, of a binary sequential asynchronous counter, AND NAND logic elements. with open collector outputs, matrices of resistors R -2R and transistor current stabilizers. The output of the filter 7 is connected is the input of the preamplifier B, the output

which is connected to the inputs of the synchronous generator 9, ne, vvo analog switch 10 and inverting amplifier 11, the output of which is connected to the input of the second analog switch 12. The outputs of both analog switches 10 and 12 are connected to the inputs of the adder 15 signals, the output of which is connected to the information input of the peak detector 16, the output of which is connected to the first input of the comparator 17. The Larnny output of the synchronous generator 9 is connected to the fault input of the peak detector 16, the second output of the synchronous generator 9.- to the fault input of the generator 22 of the foam generator the third output of the synchro-generator 9 — with the input of the first driver 13 strobe pulses and the second, input of the logic: AND 28 circuit; the fourth output of the siihrogenerator 9 with the input of the second driver 14 strobe pulses, as well as with the first input of the second logic And 27 and with the control we enter the switch 30. The output of the first gate stator 13 is connected to the control input of the first analog switch 10 and the second input of the logic circuit OR 18, the output / second gate of the gate driver 14 with the control input of the second tax the key 12 and the first input of the logic switch OR 18, the output of which is connected by a cS input of the RS trigger, 19 The output of the R5 trigger is connected to the first input of the first logic circuit AND 20, the second input of which is connected to the generator output 21 counting pulses .COB, and the output of the first logical cxeib I; 20 is connected to the counting input of the step voltage generator 22. The analog output of the 22-stage voltage generator is connected to the second input of the comparator 17, and the code-output voltage-generator 22 of the step voltage is connected to the information inputs of the first 23 and second 24 buffer memory blocks. The output of the second block 24. of the buffer memory is connected to the input of the second digital-to-analog converter 26, the output of which is connected to the first register input 31. The output of the first block 23 of the buffer. the memory is connected to the input of the first digital-to-analog converter 25, the output of which is connected to the second input of the recorder 31, as well as to the second input of the switch 30, to the third input of which the source 29 of the reference voltage is connected. The output of the comparator 17 is connected with the second input of the second logic circuit AND 27, with the first input of the third logic circuit AND 28, as well as with the R input of the RS flip-flop 19. The output of the second logic circuit 27 is connected to the control input of the first unit 23 the buffer memory, and the output of the third logic circuit AND 28 - with the control input of the second block 24 of the buffer memory.

The device works as follows.

Emitter 2 of borehole 1 excites in the well pulses of elastic waves, which, propagating in the well, are sensed by the receiver 3 of the device. The receiver converts the acoustic oscillations into electrical signals, which are amplified by the electronic unit 4 of the downhole tool and transmitted together with the synchronization pulses generated at the moments of excitation of the radiator 2, are transmitted through carotec cable 5 to the ground panel 6 to the filter input 7. From the filter output -7 these signals are fed to the input of preamplifier 8, from the output of which amplified signals from acoustic logging (diagram 32) .further come to the input of the clock generator 9, to the input of the first analog switch 10, and also to Inverting amplifier 11 output. From the output of inverting amplifier 11, acoustic logging signals (diagram 33), 180 phase inverted relative to the input signals, arrive at the input of the second analog switch 12. The synchronization generator 9 is triggered by the sync pulses received from the downhole tool at excitation of the radiator 2, and generates short pulses on the first and second of its outputs at the moment of arrival of these sync pulses on the first and second outputs. The pulses from the first output of the synchro-generator reset the peak detector 16 to the zero state, the pulses from the second output of the synchro-generator 9 reset to the zero state, the state of the generator 22 is a step voltage. The third output of the synchro-generator 9 forms rectangular pulses of positive polarity, shown in diagram 34, the duration of which is equal to the period of the sync pulses of the downhole tool, and their frequency is two times lower than the frequency of the sequence of sync pulses. At the fourth output of the synchro-generator 9, the same square impulses of positive polarity are formed, as at the third output, but with a delay for the period of the device's sync pulses (Diagram 35). The operation cycle of the device consists of two half cycles: “the first half cycle on the third output of the synchro-generator is zero potential, and on the fourth output is positive, in the second half-cycle, on the contrary, the positive potential on the synchro generator, and on the fourth zero. In the first half-cycle of operation, the device has positive pulses from the fourth clock of the clock generator to the first input of the second logic circuit I 27, to the control input of the switch 30 and to. the input of the second driver 14 strobe pulses. When a positive potential arrives at the control input of the switch 30, a third input of the switch is connected to its output (as shown in Fig. 2), to which the reference voltage source 29 is connected. In this case, the reference voltage is applied to the power supply circuit of the generator 22 of the step voltage and sets the maximum value at the analog (step) output of this generator. The leading edge of the positive pulses from the fourth output of the synchronous generator 9 starts the second gate generator 14, which generates a pulse equal in duration to the first half-period of the acoustic logging signal (diagram 36). The impulse from the imaging unit 14 opens the second analog switch 12, which passes to the adder 15 signals and then from the output of the adder to the input of the peak detector 16 only the first half-cycle of the acoustic logging log (diagram 37). The storage capacitance of the peak detector 16 is charged to a voltage U of diagram 38 equal to the amplitude of the first half-period of the signal at the output of the inverting amplifier 11. The output voltage of the peak detector 16 is supplied to the first input of the comparator 17. The gate pulse from the driver 14 also flows through the logic circuit OR 18 to the 5-input R.5 trigger 19. The falling edge of this pulse. The RS-flip-flop 19 is tilted into one state, in which a positive potential arriving at its first input is set at its output AND circuit 20, the second input of which receives the positive pulses from the generator 21 counting pulses. At the same time, from the output of the first logic circuit AND 20, the counting pulses begin to pass to the counting input of the generator —22 of a step voltage, which converts the number of igshuls into a linearly increasing step voltage. This voltage, from the analog output of the generator 22, is fed to the second input of the comparator 17 (figure 39). At the time when the voltages are equal at both inputs, the comparator 17 generates a short positive pulse at the output (Diagram 40, which pushes the R5-trigger 4.9 into the zero state in front of the front edge. At the same time, the zero-blocking potential is set at the output of the Trigger counting pulses of the generator 21 through the first logic circuit AND 20 to the input of the generator 22 of step voltage. Since in the first half-cycle of operation of the device at the first input of the second logic circuit Vi 21 there is a positive potential, then An output pulse from the output of co1 parator 17 through the second input of the second logic circuit 27 also passes to the control input of the first block 23 of the buffer memory and allows the transmission to the first block 23 of the buffer memory of information from the code output of the step voltage generator 22. The buffer memory block 23 information is fed to the input of the first digital-to-analog converter 25, which converts the code into an analog voltage equal to the amplitude of the first half-period of the acoustic signal at the output of the inverting amplifier. The voltage from the output of the first digital-to-analog converter 25 is supplied to the second input of the switch 30 and to the second input of the recorder 31. In the second half-cycle of operation of the device, a positive square pulse is generated at the third output of the clock 9 and the potential does not. its fourth output becomes zero (diagrams 34 and 33). When a zero potential arrives at the control input of the switch 30, its second input is connected to the switch output. Therefore, in this cycle, the voltage supply circuit of the 22-step voltage generator is supplied through the switch 30 to the voltage from the output of the first digital-to-analog converter 25. The leading edge of the positive pulses from the third output of the synchronous generator 9 starts the first gate pulse generator 13, which is equal in duration to the second Acoustic logging half-period (diatpaMMa 41). A pulse from the first imaging unit 13 opens the first analog switch 10, which passes only the second half-period of the acoustic logging signal to the adder 15 and then from the adder output to the input of the peak detector 16 (graph 42J. Cumulative capacity of the peak detector 16, previously discharged to zero voltage at the beginning of the half-cycle, the pulse from the first output of the synchro-generator 9 is charged to the voltage Tsu (diagram 38) equal to the amplitude of the second half-period of the signal at the output of the preamplifier 8. Shlho The peak voltage of the peak detector 16 is fed to the first input of the KOMnapciTopai; il 7. The strobe pulse from the first driver 13 also enters the {OR 18 circuit) at the S input of the Trigger signal 19. The back edge of this RS pulse trigger 19 is tilted At the output of the RS-flip-flop 19 a positive potential is established, which arrives at the first input of the first logic circuit AND 20, to the second input of which positive pulses are received from the generator 21 counting pulses. In this case, from the output of the first logic circuit AND 20, the counting pulses begin to pass to the counting input of the generator 22 of a step voltage, which converts the number of pulses into a linearly increasing voltage of the step shape. This is a voltage from. analog output of the generator 22 is fed to the second input of the coltarator 17 (figure 39). At the moment of equality of the voltages at both inputs, the comparator 17 generates a short positive pulse (diapatMMa 43) at the output, which, with its leading edge, overturns the R5 flip-flop 19 to the initial zero state. At the same time, at the output of the R5-trigger 19, a zero potential is established, prohibiting the passage of the counting Pulses of the generator 21 through the first logic circuit AND 20 to the counting input of the generator 22 of the step voltage. Since in the second half cycle of operation of the device at the second input of the third logic circuit 28 there is a positive potential, the positive output pulse of the comparator 17 passes through the first input of the third logic circuit 28 also to the control input of the second block 24 of the buffer memory and allows the second information block 24 from the code output of the step voltage generator 22. From the output of the second block 24 of the buffer memory, the information is fed from the input to the second digital-to-analog converter 26, which converts the code to an analog voltage to the first input of the recorder 31. The voltage V at the output of the second | digital-to-analog converter 26 is proportional to time t ((diagram 39) is determined as follows by the lioineft formula:, .., where T const is the maximum counting time of the generator of the 22 step voltage generator at which the step voltage reaches the maximum value (t depends on the capacitance the counter and the frequency of the counting pulses of the generator 21); (1 H voltage at the output of the peak detector 16 in the second half of measurements, equal to the amplitude of the second half-period of the acoustic logging signal, at the output of the preamplifier 8, Vi voltage at the output of the first digital-to-analog converter 25 which is proportional to the amplitude of the first half-period of the acoustic logging signal at the output of preamplifier 8 (k 0005 is the gain of the inverting amplifier 11, which is chosen so that it is greater than the operation maximum possible value of the ratio A2 / A). Formula (1) can be converted as follows: v.I ... Thus, in the measurement cycle, the proposed device makes it possible to measure the amplitude of the first half-period of an acoustic logging signal and the value of the ratio c1 of the amplitude of the second half-period of this signal to the amplitude of the first half-period. The device can also be used to measure the magnitude ratio of the amplitude of any positive half-period of the acoustic signal to the amplitude of any negative half-cycle of this signal .. For this, the device strobe-pulse drivers must be configured to extract the corresponding half-periods of the acoustic logging signal. The use of the proposed device in the acoustic logging equipment will improve the efficiency of well surveys by expanding the functionality and informativeness of the equipment.

Claims (1)

A DEVICE FOR ACOUSTIC LOGGING OF WELLS, containing a downhole tool, consisting of a transmitter and receiver of acoustic vibrations, an electronic unit for exciting the transmitter, forming a synchro-. pulse ϊ amplification of the receiver signals, as well as a wireline cable and a ground panel consisting of a filter, pre-amplifier, analog key, pulse generator, pulse generator, clock generator, peak detector, comparator, R5 trigger, counting pulse generator, logic circuit , a step voltage generator, a buffer memory unit, a digital-to-analog converter and a registrar, the downhole tool output being connected via a wireline cable to a filter input, the output of which • is connected to the pre-input of the preamplifier, the output of the preamplifier is connected to the input of the analog switch, the first output of the clock is connected to the dump input of the peak detector, the second 'output of the clock is connected to the dump input of the step voltage generator, the third output of the clock is connected to the input of the strobe generator, the output of which is connected with the control input of the analog key, the output of the peak detector is connected to the first input of the comparator, to the second input of which the analog output of the generator is connected with step voltage, the output of the RS-trigger is connected to the first input of the logic circuit And, the second input of which is connected to a counting pulse generator, the output of the logic circuit And is connected to the counting input of the step voltage generator, the code output of which is connected to the information input of the buffer memory unit, the output of which is connected with the input of the digital-to-analog converter, which is related to the fact that, in order to expand its functionality by measuring the magnitude of the ratio of the amplitudes of different half-periods of the oscillation acoustic signal into a ground plate 'introduced inverting amplifier, a second analog switch, a signal combiner, the second shaper strobe logic OR circuit, a reference voltage source, the switch, the second and third logic AND gate, the ^second: the block buffer memory and a second digital to analog converter, moreover, the input of the inverting amplifier is connected to the output of the pre-amplifier, the output of the inverting amplifier is connected to the input of the second analog key, the outputs of both analog keys are connected to the inputs and a signal adder, the output of which is connected to the peak detector input, the input of the second gate pulse generator ... is connected to the fourth output of the clock generator, to which the control input of the switch and the first input of the second loop are also connected; SU „1040447 of the AND circuit, the output of the second strobe driver is connected to the control input of the second analog key and to the first input of the OR logic circuit, to the second input of which the output of the first strobe driver is connected, the output of the OR circuit is connected to the S-input R5 trigger, R-input of the RS-trigger is connected to the output of the comparator, which is also connected to the second input of the second logic circuit And and the first input of the third logic circuit. And, the second input of the third logic circuit And is connected to the third output of the sync generator, you the course of the second logic circuit And is connected to the control input of the first block of buffer memory, the output of the third logic circuit And is connected to the control input of the second block of buffer memory, the information input of which is connected to the code output of the step voltage generator, the output of the second block of buffer memory is connected to the input of the second digital-to-analog converter the output of which is connected to the first input of the recorder, the output of the first digital-to-analog converter is connected to the second input of the recorder and the second input. a switch, to the third input of which a reference voltage source is connected, and the output is connected to a step voltage generator.