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Test systems and digital calibration of the nonlinear correction


Available through A (undecided a Y) B (jump, Y.) two points of the linear equation Y () to Y () a Y one by one for a a】 Qi. 】 Care of a Man. , Y () to wait (y.t). , (1) ah straight line approximation curve AB, () the maximum error of 5 eggs stabbed j () = x,) (-tj1:. Lap 1 when ... () ≤ d (d to allow for error), in the interval cx; a ∞] available on Y () instead of, (),[link widoczny dla zalogowanych], you can use Y () to calculate the corresponding, (). When a ()>, can be in the interval [Qi ∞] by two sub-areas Q] , [, Sapporo j, in each district asked by the above method for solving linear equations. If you are still mainly the precision of the molecular range can continue until the meet the requirements so far, so that the interval [a hiss] and to approximate the original line with paragraph a curve, the error is within the scope allowed to complete the nonlinear correction. 2. digital calibration A / D output values often do not have the dimensions, it only reflects the numerical size, so this value before output, must be it for calibration,[link widoczny dla zalogowanych], discussed here is a linear digital calibration. known Y () in the area asked the [-Y] is a linear function, F () is Y () of the calibration function, as shown in Figure 2. Y the corresponding calibration values were l,, l,, by C (Yi_l,[link widoczny dla zalogowanych], Y ¨), D (, Y) are two linear equations for the F () =- Y) + (2) to be completed by the linear type function Y () of the digital calibration task. Turning anti-cent total flight operation Figure Z 'above the nonlinear function of correction and linear function of digital calibration. In practice, the first nonlinear function with a linear function to approximate, and then a linear function of the digital calibration, which is bound to bring a lot of calculation, which is not applicable for single chip test system, in order to reduce the computation, The following method can be used. Known by the linear correction of Y () a, () ∈ [. 1, ∞] Y =,) Y =,. t) the above conditions into (2), we have c =_;· c-Y \linear correction, and digital calibration. Third, the realization of the actual computer test system,, () for the system parameter measurement function,, (Qi .),,() are measured within the range of minimum and maximum. Y. .. that () corresponds to the calibration value, l, that, (∞) corresponds to the calibration value. F () is modified by non-linear systems and digital calibrated measuring function. If you just press (0) is calculated . need three subtraction, one division, multiplication and addition. to 0 in the guillotine process of reducing the amount of computation to increase the quality of the system when the feast, so that Ki; the He LbjYf.1 then F (x) = K [, () a, (song.)] +6, (4) When the amount of splash range is determined, (4) of K, the island has been snail is a fixed number. can be calculated in advance and stored in computer memory, in general, or the EPROM into the EPROM in. This real-time measurements only once subtraction,[link widoczny dla zalogowanych], multiplication and addition can greatly reduce the computation time to ask. calculated K, b the block diagram shown in Figure 3. nonlinearity correction and digital calibration block diagram shown in Figure 4.3 this method has been applied in weighing instruments (through identification) into the actual product to get good results. Weighing know by the weight sensor, signal amplifier circuit, A / D converter circuit blocks into a single measure Ij, () 『potential spiritus , () in the ten areas measured simply from memory, Fu Yang Medical cyberspace, according to \measured before and after data. Table shows the maximum error before the correction calibration 5.7kg, maximum error after calibration correction 0.8kg. Table 1 unit, kg standard weight correction calibration is calibrated before the startled 1O0O.0o96.01O0O. 52000.O109 | .3 to0O.T3000o2 cricket 7.330D0.B {0 at o03907.9 '々 OO,[link widoczny dla zalogowanych], '5 O00.O '98I909 .8 IV Conclusion The proposed method has been used in actual products into volume production, with highly adaptive, effectively improve the precision of the system, reducing the hardware requirements, simplifying the production process, particularly conducive to products of mass production, but also to facilitate the system maintenance in the long-term use or after the amendment and re- calibration. Ref. C1) Li Yuesheng and other teaching approach, \[2) Sun Han Fang and so on. \Beijing, 1937. First Author and Address: Air Force Telecommunication Engineering Institute of Xi'an, Xi'an (710077) 192 cars posts 5 Shuo

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