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MAX197 in the battery detection and treatment of measurement error analysis

max5-2O47). Table 3 is set to a 5V MAX197B 5V measuring range of a measured data: (measured value is a measure of 8 times the arithmetic mean value) 3.4 Analysis of data analysis device: A type of error is small compared with B-type; devices China's main source of error for the offset test technology in March 2007 and gain errors; unipolar than bipolar conversion conversion offset error. Experimental data analysis: the measurement offset error, unipolar conversion when the OV output error is very small, bipolar output when a certain Ov conversion errors (experimental errors are ± 1LSB). Measurement gain error, unipolar and bipolar gain error when the very same time, can also be found when unipolar offset error small when compared with bipolar. 4 error processing based on the analysis above, in order to reduce systematic measurement errors, the following special precautions and handling methods: (i) If a higher accuracy of measurement and does not consider the economy, can be considered A selection of high-precision type of chip. (2) The conversion ratio MAX197 unipolar bipolar conversion error is much smaller,ugg prezzo, so in practice to select a unipolar conversion, the negative voltage to be measured can be considered after the first negative voltage through the reverse re-conversion. (3) offset error and gain error as the existence of positive and negative voltage requirements of the maximum measured value can not be too close to the measured value of the positive and negative full scale, or magnification to reduce the front-end or extend the measurement range MAX197. (4) MAX197 offset error and gain error compensation. MAX197 previously described the main error source is the offset error and gain error, and therefore to reduce the measurement error of these two errors must be compensated. Here's an effective compensation method: first to provide two different known DC reference voltage as input, reads the conversion value of the two inputs, the use of these two sets of input and output values of the offset error can be obtained MAX197 and the actual gain, and then use these two values of the conversion value of reading to compensate for the measured voltage value obtained, thus improving the accuracy of AD conversion module. Figure l shows how to use the equation to obtain the offset error of AD modules and the actual gain. The calculation process is as follows: (a) for a known reference voltage input signal and the conversion value of the Hong yH; (b) using equation y = xxma + b and the known reference value (xL,) and (xH, yH) calculated offset error and the actual gain: offset error b = yH-xHxma the actual gain,ugg italia, n (yH-yL) / (xH-xL) (c) by the above equation y = xxma + b conversion by = (y-b) / ma. Generation above the offset error of b calculated and actual gain compensation can be obtained after the measured value. The above method requires that compensation should be separate for each channel, debugging process is relatively complicated,ugg milano, MAX197 can be applied in the practical application of the channel characteristics of small errors greatly simplify this process, the specific method is to use one of the two spare channels of the access a known DC reference voltage to complete the above calibration measurements, and then get the offset error of b and the actual gain compensation data for other channels. In practice, through the software programming in the measurement program in the microprocessor compensation algorithm by adding the above effective to measure the total relative error less than 1% o the total absolute error within ± 2LSB control, greatly improving the system measurement accuracy, to meet the actual system requirements of high precision battery testing. 5 Conclusion A / D converter is the core component of the data measurement system, and its good precision and accuracy of data acquisition circuit performance is to improve the key. In this paper,stivali ugg, MAX197 battery error detection system for a more detailed analysis, presented the recommendations to improve the accuracy MAX197 conversion and compensation algorithm was proved practical and feasible,ugg boots günstig, to other types of A / D module has universal application of the same guidance significance. References [1】 MaximDatabook. MAX197Datasheet. [2】 Zhao Yuping, Xie tied to ground, Guo Xiaokang. TMS320c28x accuracy of the ADC calibration [J】. Microcontroller and Embedded Systems ,2005,8:75-76. [3】 Wang Wei, Zhang Yi-Hui, Fan Dawei. MAX197 in the data acquisition system [J】. Electronics ,2002,3:53-55. [4] Fangjun Li, Zhu Hongyu. MAX197 in multi-channel data acquisition application [J】. Electronic Design & Application, 2004,1:101. [5】 Fei Yetai. Error Theory and Data Processing (4th Edition) [M]. Beijing: China Machine Press. 2004.

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