SU811269A1 - System for processing data at graduating information measuring channels - Google Patents

Description

The system comprises a setting device 1, a measuring converter 2, an adder 3, a dividing device 4, an extremum extraction unit 5, a multiplying device 6, a subtracting device 7, a computer 8.

The system is intended for detecting and linearizing, using the Chebyshev method, the calibration characteristics of the measuring transducers included in the information-measuring channels. The use of the Chebyshev method makes it possible to ensure, at linearization, a minimum of the maximum approximation error, i.e., to increase the accuracy of the measurement results.

The system works as follows.

Unit 1 sends the current values of the input signal to transmitter 2, adder 3, multiplier 6 and computer 8. In addition, unit 1 sends signals to the final values of the input signal to transmitter 2, adder 3 and multiplier 6. From the transmitter 2 information About the current values of the output signal is fed to the computer 8 and to the adder 3. In addition, information about the final values of the output signal from the measuring transducer 2 is fed to the adder 3 and the subtractive device 7. Adder 3 performs two summation operations. First, it summarizes the current and final values of the output signal, and second, it summarizes the current and final values of the input signal. Both signals are sent to the dividing device 4, which divides the corresponding output and input signals from the adder 3. As a result of the dividing, signals of the current values of the conversion coefficients are formed, which arrive at block 5. Block 5 analyzes the obtained conversion factors in the operating range, excluding points at the end range, selects the extreme value of the coefficient. The signal corresponding to the extreme value of the conversion coefficient is fed to the multiplenation device 6. In the device 6, a signal of the current values of the linearized characteristic is generated that meets the condition of the best uniform Chebyshev approximation. The signal is proportional to the product of the current values of the input signal by the extremal conversion factor. This signal is transmitted to the memory of the computer 8. In addition, the multiplier 6 performs the operation of multiplying the final value of the output signal by an extreme conversion factor. A signal proportional to the last product is fed to a subtractor 7, which subtracts this signal from a signal proportional to the final value of the output signal. As a result of the subtraction, a signal is generated that is proportional to the approximation error, which is entered into the memory of the computer 8.

Thus, in the computer memory 8 there is information about a nonlinear calibration characteristic, a linearized calibration characteristic that meets the condition of the best uniform Chebyschev approximation and passing through the origin, and the maximum error

approximations.

In the described system, an adder, a multiplier, and so on, making up an autonomous system, are used. The computer only receives the results for storage.

linearization, which are used in tests to convert measurement signals to physical quantities. The autonomous calibration of the measuring transducers allows to solve the problem of computer computer time and reduce the preparation time of the experiment at each stand by approximately two times.

Claims (2)

1. A. A. Rotte. Testing of pumping installations. - M., “Nedra, 1967, p. 67-72. 2. Rosenberg V. Ya. Introduction to the theory of accuracy of measuring systems. - M .: “Soviet Radio, 1975, p. 257-261 (prototype).