SU1277031A1 - Method of automatic calibration checking of electrical instruments - Google Patents

Abstract

This invention relates to the field of electrical measurements. It can be used for automatic calibration of ready dial instruments, as well as for automatic calibration of instruments during their mass production. The purpose of the invention is to increase accuracy and performance. automatic calibration when reading the instrument readings by a television sensor (TVD); According to the method, the reading beam of the theater turbine 5 is turned around on a circle, performing a sequential conversion of the optical images of the scale marks and pointer into electrical pulse signals. According to the program entered into the control computer I, a pulse is selected that corresponds to a given scale mark. The computer is connected to the input signal adjuster 2, which acts on the pointer of the instrument being scanned 3. The instrument scale is represented by (the lens 4 is designed to target TVD 5 connected to the unit (L 6 control). The output of the verification results is carried out by the printer 7. 2 .

Description

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ABOUT

figure 1

The invention relates to electrical measurements and can be used both for automatic calibration of ready dial instruments, and for automatic calibration, of instruments during their mass production.

The aim of the invention is to improve the accuracy and performance of automatic calibration when reading instrument readings by a television sensor.

Figure 1 presents a device that implements the method of automatic calibration of electrical devices; Fig. 2 shows graphs illustrating the processes of the method.

The device contains (FIG.) Control micro-computer 1, an input signal adjuster 2, a scanned device 3, a lens 4, a television sensor 5, a control unit 6, a printing device 7.

The control microcomputer 1 is connected to the input signal adjuster 2, which acts on the pointer of the device being tested 3. The scale image of this device is projected onto the target of the television sensor 5 connected to the control unit 6 via a lens 4. The results of the verification are performed by the printing device 7.

Figure 2 shows graphs illustrating the processes of performing the method of automatic calibration of electrical measuring instruments. When multiple edges are multiplied together at a given point g of the instrument, the results of the reference are obtained using a computer in the form of scattering fields 8 and 9. The input signal 10 has a stepped form (only the increasing input signal is shown, since with a decreasing signal the graphs are similar, they only change places of the direction of movement of the pointer and read, as well as the scattering field 8 and 9 of the edges of the mark g).

The method is carried out as follows.

The reading beam of the television sensor 5 is deployed in a circle with a period, thereby carrying out a sequential conversion of the optical images of the scale marks and the pointer into electrical pulse signals. By counting

the number of pulses programmed into the control micro-computer 1, the pulse corresponding to a given scale mark is selected. At the same time, in order to avoid false counting caused by the presence of a pointer pulse, the direction of the reading beam is set by the opposite direction of the pointer movement, due to the action of the input signal 10 on it, which after the end of each scan cycle during Tpj.j is abruptly increased by a constant value. Since the scanning speed is tens of thousands of times the speed of movement of the pointer to a predetermined mark (Fig. 2), its edges are repeatedly read. At the same time, while the pointer is far from the specified mark, during each read cycle, two numbers are obtained defining the position of the edges of this mark by filling the time interval from the instrument's maximum mark (maximum with increasing input signal and zero with decreasing) with corresponding pulses to the corresponding edges of a given mark. The resulting groups of numbers are processed using the microcomputer 1 and are presented in its memory as scatter fields 8 and 9.

Claims (1)

When the pointer approaches the edge of the preset mark due to the increase in the signal level, their optical images, due to overlapping, begin to merge, the combined signals V converted into numbers jump steadily (A, B, figure 2), as a result By which the previously found scattering field 9 of these signals is significantly deformed. At the moment when the first value of the signal V read after this (point C) is within the dissipation field 9, which corresponds to the optical alignment of the left edges of the pointer and the point being calibrated, the number M of read-up cycles performed before is recorded. Since the width of the pointer is usually less than the width of the mark during further reading cycles, i.e. when the pointer moves within the width of the mark, both readable numbers are within the fields 8 and 9 of the scatter. As soon as the right edge of the pointer is superimposed on the right edge of the alignment mark, the numbers L |, B, Cj of the output signal Vn, are read out, abruptly decrease and go beyond the pXx limits of the scattering field 8, deform it. With the appearance of the first number B, lying outside the scattering field 8, the number of cycles N, obtained by reading the previous number A, which did not deform the indicated scattering field 8, is recorded. As can be seen from FIG. 2, the exact value of the output signal, determined at combining at the time of the Centers of the indicator and KO controlled by the instrument marks, are found as the average value of the interval between the fields 8 and 9 dissipation, i.e. and Y2 .. 6SHX 2 This value corresponds to M + Nt value Y "-" -. Since the input signal AVg is incrementing each cycle of the coupling constant, the magnitude of the input signal at time T is calculated using the control microcomputer 1 using the formula M + NS f Ji; BY 2 The price of the Z mark of one division of the set, as well as the sequence numbers of the controlled marks, are programmed into the memory of the microcomputer in advance by software. Therefore, the magnitude of the output signal at the time instant tgjj0p is determined using the control microcomputer 1 according to the formula V (Yibiii-t.YsiO--). 7-P vy 2 - where p is the serial number of the controlled mark, reduced by one, since the first mark of the scale is the limit. After reaching the maximum value of the input signal, the command of the control unit 6 and the control microcomputer 1 switch the scanning direction of the beam of the television sensor 5 and the mode of operation of the input signal adjuster 2 to the stepwise decreasing of the input signal and repeat the described operations in order to eliminate dynamic saturation. By finding the average value of the signals Yn and V. found in both cases, it is determined by the AG CTX that their difference is made and a conclusion is made that the instrument being tested corresponds to its accuracy class. The results are printed using a printing device 7. Claims of the invention A method of automatically calibrating electrical measuring instruments, in which the optical images of the indicators and scale marks are converted into electrical output signals and, at the same time, an increasing (decreasing) input signal acting on the instrument indicator The moments of combining the edges of the pointer with the edges of the points being scanned are scaled, and the differences between the input and output signals and conclude that the calibrated device corresponds to its accuracy class, characterized in that, in order to improve the accuracy and performance of the calibration, the input signal is increased (decreasing) in equal steps in each scan cycle and the position of the calibrated mark is read the beam, the magnitude of these steps is set to an order of magnitude smaller than the signal corresponding to the accuracy class of the instrument being scanned, and the scanning direction is set by the read beam to the opposite direction In this case, the pointer movement is determined as the average value of the interval between the scattering fields of the measurement results of the position of the edges of the instrument to be checked relative to its limit mark, and the input signal is defined as the half sum of two numbers of its stages deformations of the specified fields of assimilation when superimposing the image of a moving pointer of the instrument on the image of a check mark. Overburden /////////. t / afja / 7 e jf BL R X fforrfta & flenve C (/ (Jf77bfScr t / a Vg. btJff tVg,