SU1679444A2 - Device for tuning and testing of pulse electric prospecting equipment - Google Patents

Abstract

The invention relates to the field of technical physics and can be used in geophysical instrumentation to tune and calibrate instrumentation of the method of transient processes and sounding the formation of the floor. This goal is achieved by introducing a time generator, a binary code converter into a binary binary and digital indicator into a known device containing digital generators of sinusoidal, exponential and random signals. Due to this design, it is possible to directly read the amplitudes of sinusoidal and exponential signals arriving at the input of the equipment being tested strictly at a time instant coinciding with the midpoint of the strobe pulse during which the calibration signal entering the equipment is integrated and measured. 1 hp f-ly, 2 ill. SS

Description

The invention relates to the field of technical physics, can be used in geophysical instrumentation to tune and calibrate the instrumentation of the transient process method and to probe the formation of the field and improve it, and the device by author. St.

V 1241177.

The purpose of the invention is to reduce the labor intensity and increase the efficiency of control of the metrological characteristics of the hanging equipment.

The figure shows the block diagram of the device for setting up and checking the pulsed electrical survey equipment; figure 2 - diagram of the shaper time intervals of the device.

A device for tuning and checking pulsed electrical prospecting equipment includes a generator of 1 rectangular pulses, a first divider 2 frequencies, a second divider 3 frequencies, a shaper 4 phase codes, a binary code comparison circuit 5, a generator of 6 sinusoidal signals, a generator of 7 exponential signals, a generator of 8 random signals counting trigger 9, source 10 pic

This current, the adder 11, the driver 12 time intervals, will convert Gl 13 of the binary code into a binary-decimal, switched digital indicator I, checkable equipment 15, and the driver 12 contains two inputs 16 and 17 and output 18 connected to the synchronization input of the indicator 14, the combined clock inputs, divider 2 and 3 frequencies, the random generator 8 and the input 16 of the driver 12 time intervals are connected to the output of the generator 14, the outputs of the dividers 2 and 3 frequencies are connected respectively to the inputs of the generators 6 and 7 to During the shaper 4 phase codes, the first group of inputs of the code comparison circuit 5 is connected, the second group of inputs of which is connected to the first group of digital outputs of the generator of 6 sinusoidal signals, the output of the comparison circuit 5 is connected to the combined clock input of the counting trigger Y, and the installation input to the second divider 3 frequencies , the start-up input of the generator 7 exponential pulses and the clock input of the scanned equipment 15, the control input of the sign of the generator 7 exponential signals connected to the output of the counting trigger 9, you the course of the DC source 10, as well as the analog outputs of the sinusoidal 6, exponential 7 and random 8 signals, are connected to the inputs of the current accumulator 11, the analog input of the turnable equipment 15 is connected to the output of the latter, the IK output of which is connected to the synchronizing input 17 of the driver 12 time intervals, the digital outputs of the generator 7 of the exponential signals and the second group of the digital outputs of the generator 6 of blue are connected to the first and second groups of inputs of the converter of the binary code 13 to the binary-decimal -sinusoidal signals. The first and second groups of outputs of the converter 13 are connected to the corresponding groups of inputs of the switched digital indicator I.

The time generator 12 (FIG. 2) contains three triggers 19-21, a delay element 22 and a pulse counter 23, the clock input of the first trigger 19 being the synchronization input 17 of the driver 12, the input of the delay element 22 in

five

0

five

0

five

0

five

0

five

The clock input 16 of the driver 12, the direct output of the first trigger 1 is connected to the D input of the second trigger 20, the installation inputs to the O trigger 19 and 20, and the clock input of the third trigger 21 are combined and connected to the forward output of the trigger 20, clock the inputs of the second trigger 20 and the pulse counter 23 are connected to the output of the delay element 22, the installation input to the third trigger 21 is connected to the output of the pulse trigger 23, the input of which 0m is connected to the inverse output of the third trigger 21, which is the output 18 of the driver 12 time Evaluated intervals.

A device for setting up and calibrating a pulsed electroresistive apparatus operates as follows.

Generator 1 generates a sequence of rectangular pulses with a frequency f0. From the generator 1 output, the indicated pulse sequence is fed to the inputs of the dividers 2 and 3 frequencies. And to the clock input of the generator 8 random signals. Periodic pulse sequences with frequencies kf / (J (where kg and k $ are the frequency division factors of dividers 2 and 3, respectively) are found at the outputs of delchtels 2 and 3. Under the influence of the output pulse sequence of divider 2 on the first group of digital outputs of the generator and sinusideclic signals linear number increases from 0 to 2P - 1 numerical sequence (n is the number of bits on the first group of generator outputs b). On the second group of digital outputs of generator 6 are formed in the binary code of the sinusoidal banner signal, and at the analog output of this generator - a sinusoidal current.

The zero value of the numerical sequence for the first group of digital outputs of the generator 6 coincides with the moment of crossing the zero of the sinusoidal signal with a positive slope. Thus, during the period of the sine wave, the number on the first group of outputs of the generator 6 represents the value of the current time (phase) in digital form. This number is applied to one group of inputs of the comparison circuit 5, the second

the group of inputs of which enters in binary code the value of the phase cf specified by the generator b of the phase code. At the moment of equality of the codes, a pulse arises at the output of the comparison circuit 5, which flips trigger 9 to the opposite state, divides 3 frequencies into zero and gives permission to start the generator 7 of exponential current pulses. After that, under the influence of the clock pulses fed to the clock input of the generator 7, the next exponential current pulse with the corresponding sign begins to form at its analog output. The trigger 9 provides the generation of a sequence of alternating current polarized current pulses, and the beginning of each pulse has a predetermined phase shift if relative to the beginning of the sinusoidal signal. At the digital outputs of the generator 7, simultaneously with the appearance of the analog signal (current) at its analog output, a digital exponent in binary code is formed.

Under the influence of the clock pulses of the generator 1, a pseudo-random stationary process occurs at the analog output of the generator 8 of random signals, and its code representation is generated at the digital outputs.

A DC source 10 provides a predetermined offset value of the resultant signal with respect to a zero level.

The resulting signal is formed at the output of the adder 11.

By changing the division factors kg and k3, it is possible to adjust the period of the generated sinusoidal signal and the constant decay time of the exponential pulses, respectively.

By varying the parameters of the individual components of the resultant signal, the required ratios of information and disturbing signal components can be set and, using the measured annapat checked 15, the average value in the strobe-pulse of the information signal, determine the required metrological characteristics of the electrical instrumentation (transmission coefficient and linearity of the measuring path, coefficients suppression of periodic and random noise, etc.).

.

The operation of the scanned apparatus 1 15 is synchronized by pulses from the output of the circuit 5 of coincidence, under the action of which t- $ delay pulses are formed in it. The falling edge of the delay pulses Ј3 starts the strobe pulse generator with the duration of ttf

The Q parts of the instrument 15 into the measurement unit and serve to control the operation of the integrator, which integrates the input signal over time tut Later, the integration results are averaged. The value obtained is normalized by duration, c, and refers to the mid strobe pulse. The signal is measured at various values of x3 and a constant a. It is obvious that in this case it is practically impossible to determine the value of the exponent without additional calculations. This also applies to the value of the sine wave.

To eliminate this drawback, a shaper 12 is introduced into the device, the output of which produces a sequence of pulses of duration 2/2. Under the action of a positive (back) pulse front from the output of the former 12, the digital values of the sinusoid and the exponent correspond to the instant of time

5 C + o e. Are written to the input

The register of the switched digital indicator AND is indicated last. Result displayed on

The Q output of the indicator And multiplied by the known coefficient of conversion into analogue of the digital values of the exponential and sinusoidal signals is equal to the values of the signals at the input of the equipment being turned, the codes of which are fed to the digital indicator And from the digital outputs of the generators 6 and 7 (these outputs are digital the outputs of the permanent storage devices included in the generators 6 and 7). To match the inputs of the digital indicator I with the digital outputs of the generators 6 and 7, a binary code converter 13 is inserted into the device into a binary-decimal code.

Upon arrival at the input 17 of the pulse delays from the scanned equipment 15, and to the input 16 of the pulses from the generator 1 output, the rear positive edge of the delay delay triggers the unit 19 and the potential of the logical unit to the D input of the trigger 20 clock input in one state. As soon as the trigger 20 is transferred by the first clock pulse received from the output of the delay element 22, to the state of a logical unit, the potential of the logical unit arrives at the installation inputs of the O flip-flops 19 and 20 and the latter returns to the initial state before the next delay pulse . Thus, at the direct outputs of the triggers 19 and 20, pulse sequences are formed. Under the influence of a positive impulse

from the output of the trigger 20, the trigger 21 is transferred to the state of a logical unit and at its inverse output a potential of logical zero is applied. As a result, the lock is removed from the counter 23 and the latter reads the clock pulses from the output of the delay element 22 until a positive potential appears at its output. Under the action of this potential, the trigger 21 returns to its original state. at the same time, the potential of the logical unit zeroes the counter 23 at its output and blocks it until the next pulse arrives from the output of the trigger 20. Thus, at the output 18 of the driver 12, pulses are formed corresponding to the middle of the strobe-pulse of the rotating 15, and the readout on the digital indicator I corresponds to the amplitude of the exponential and sinusoidal signals applied at this moment to the input of the test apparatus 15.

This eliminates the need for time-consuming calculations of the amplitudes of the calibration signals and increases the speed with which the equipment is calibrated.

Claims (2)

1. Device for setting up and testing pulsed electroprospecting equipment according to ed. St. No 0 5 0 5 Q 5 0 five characterized in that, in order to reduce labor intensity and increase the efficiency of monitoring the metrological characteristics of the monitored equipment, it further comprises a time interval generator, a binary code converter into a binary-decimal and a switched digital indicator, and the synchronous input of the equipment being scanned is connected to the circuit output comparing the binary codes, the synchronization input of the time interval generator, the clock input of which is connected to the output, is connected to the output of the scanned equipment. ohm the rectangular, pulse, first and second groups of inputs of a switched digital indicator are connected to the digital outputs of the generator of exponential signals and to the second group of digital outputs of the generator of sinusoidal signals through a block of binary-to-digital converters, and the synchronous input of the switched A digital indicator is connected to the output of the time interval generator. 2. The device according to claim 1, characterized in that the time interval generator comprises first, second, and third triggers, a delay element and a pulse counter, the clock input of the first trigger is the synchronization input of the time interval former, and the delay element input is the clock input of the time interval former, the direct output of the first trigger is connected to the D input of the second trigger, the installation inputs in O of the first and second triggers are combined and connected to the forward output of the second trigger and clock input the third trigger, the clock inputs of the second trigger and the impulse counter are connected to the output of the delay element; the installation input to the third trigger is connected to the output of the pulse counter, the installation input to which is connected to the inverse output of the third trigger, which is the output of the time interval generator. u c