SU1228279A1 - Method of functional adjusting of number-to-voltage converter - Google Patents

Abstract

The invention eliminates the methodological error due to the replacement of the real system of equations relating the errors of the output voltages of the converter, an approximate system of linear equations, which calculates the control values of the output voltages of the converters, since the control voltages obtained during the fitting process correspond to the real values meters of resistors of the decoding grid of the converter, taking into account their changes in the process of fitting. Transducer 1 is supplied with code combinations from the control code generator 3 in such a way that in the first clock only the adjustable bit is turned on, in the second one everything that is present, and in the third clock only the lower bit, and in each clock cycle the digital voltmeter 2 measures output voltage of the converter 1. In the second cycle at the output of the adder 4, we obtain the difference between the values of the output voltages of the converter from the switching on of the adjustable discharge and the switching on of all previous bits, which is fed to one of the outputs of the adder 5. In the third th clock cycle the adder 5 and the digital zero-comparator 6, a comparison is performed difference i (L

Description

the values of the output voltages of the converter 1 from the inclusion of the youngest bit. The change in the resistance value of the resistor of the decoding grid of the adjustable discharge is carried out to

The invention relates to an information-measuring technique and can be used in the manufacture of precision code-voltage converters.

The purpose of the Invention is to improve the accuracy of fitting code-voltage transducers.

The drawing shows a structural diagram of one of the possible variants of the device that implements the proposed method.

The device contains a adjustable transducer 1, where Rp and R (, are decoding grid resistors, and R is a scale resistor, a digital voltmeter 2, a generator of control codes 3, two algebraic adders 4 and 5, a digital zero-comparator 6.

The method of functional adjustment of the code-voltage converter; is implemented as follows.

The converter 1 is supplied with code combinations from the control code generator 3 in such a way that in the first clock only the adjustable bit is turned on, in the second all previous ones, and in the third only the low bit, and in each clock cycle the digital voltmeter 2 measures the output voltage transducer life. In the second cycle at the output of the adder 4, we obtain the difference between the output voltages of the converter from the switching on of the adjusted discharge and the switching on of all the previous bits, which is fed to one of the inputs of the adder 5. In the third cycle, the adder 5 and the digital zero comparator 6 are produced comparing the difference between the output voltages of the converter 1 from switching on the adjustable bit and switching on all previous bits with the value of the output voltage of the converter from the switch-on time of the digital zero-comparator ora fS. In a similar way, all bits of the converter are fitted, 1 slug.

cheni junior bit The change in the resistance value of the resistor of the decoding grid of the adjustable bit is maintained until the digital zero comparator 6 is triggered. Similarly, all bits of the converter 1 are fitted.

A change in the resistance value of the resistors in the adjustable bit of the decoding grid does not affect the ratios of the output voltages of the converter from switching on each of the previous lower bits to the output voltage of the converter from switching on the low bits. In a fitted converter, the weight of each subsequent discharge must be twice the weight of each previous one, therefore the output voltage of the converter from switching on each subsequent discharge must be different from the output voltage of the converter, from switching on all previous bits by the value of the output voltage converter, from switching on only low bit.

Consequently, when fitting in accordance with the proposed method, the linearity of the conversion function of the converter is first adjusted, then the sensitivity is adjusted by changing the resistance value of the scale resistor until the output voltage of the converter is equal for all included bits of its nominal value.

Claims (1)

Invention Formula The method of functional connection of a code-voltage converter based on measuring the output voltages of a converter when its discharges are connected in series, determining the difference between the measured values of the output voltages and their control values, and correcting them in accordance with this resistance difference of the corresponding resistors of the decoding matrix converter, characterized by the fact that, in order to improve the accuracy of the fit, when determining the difference for the i-th bit of the converter, as an equivalent uyuschego reference value using an output voltage measured when the 1-1 LSBs pre282794 the generator, and the resistor resistors of the decoding matrix of the converter are corrected while simultaneously comparing the difference for each bit with the output voltage when the low-order bit is on until they are equal, after which the scaling of the converter's 10 resistor is changed to moment of achieving equality of the output voltage of the converter with all its included 15 bits of its nominal value.