tory burch sale The reduction of temperature measu

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The reduction of temperature measurement system temperature drift compensation method

: Resistance value of the wind, the month is fixed, while the frequency of F and F first in the state I (, E.) Determination of the condition, so the scale to accurately calculate resistance. Must be. , E. F. obtained under conditions . In the actual measurement process, the ambient temperature and the bridge voltage is always changing. For the same thermal resistance, if the state Ⅱ (, E) under the conditions of the corresponding frequency with F. To express, how can restore the F F. It? 3.2 calibration status (. E.) Memory in the Figure 1 circuit, the temperature coefficient of the two-level access to the small scale of manganese copper resistance. And feet, we need not know the exact resistance, as long as the resistance does not vary with temperature changes (or changes very small) can be. At ambient temperature and the bridge voltage E. Conditions, the calibration of zero feet. And full-scale foot, we will move manganin resistor feet. Access bridge, (K., K is closed, K..,[link widoczny dla zalogowanych], KK3., K3 off), CPU time automatic sampling and record the frequency value of F. , And then foot off, access to R, CPU from Volume 24 l of Caoyu Jiang et al: Reduction of temperature drift compensation system temperature of 35 fixed sampling method and note the corresponding frequency F,, thus: F. = R (T., E.) Feet. + S (T., E.) (15) F2 = R (T., E.) Ft + S (T., E.) (16) The significance of this two-step measure: for standard resistance scale. And the scale of the resistance is fixed, so the frequency of F. , F reflects the ambient temperature. And the bridge voltage E. Status information. To F. , F into the EPROM. General (13), (15), (16) the three equations have (· + Fl (17) 3.3 Reduction of compensation in the measurement state (T, E) under the standard resistance and heat resistance of foot foot foot. Were Access measuring bridge, and then measure the frequency corresponding to their respective F, and F., there are: F = R (T, E) scale. + S (T, E) (1 Cool

= R (T, E) ft + S (T, E) (19) F = R (T, E) scale. + S (T, E) (20) F, reflects the state of U (T, E) of information, with the type (18 ), (19) elimination (20) in the R (T, E) and S (T, E), and arranged, so = so testosterone feet a lF-Fl. the type (21) into (17) get F. = 2_ c Lu (F. a F) + F. (22) by equation (22) can be arbitrary ambient temperature and supply voltage E state of the foot. The corresponding frequency F. restore calibration state frequency F, using equation (14) solved feet., and then look-up table or formula R. = R. (1 + +) calculated the temperature t. 4 results in our development of the steam temperature measuring instruments, the use of this method. meter measurement range of 0 ~ 60O ℃, Ptl00 at 0 ℃, the resistance R. = 100Q, the resistance in the 60O ℃ foot = 313.59Q, at room temperature for half an hour after the power meter, the device temperature reaches balance, then calibrated by the above method, and then put into practical application, the effect is very good. For purposes of comparison, we use a single instrument for carrying out temperature compensation and temperature compensation is not carried out experiments under two conditions. experiment into the instrument incubator, the simulation environment temperature,[link widoczny dla zalogowanych], instead of the standard resistance box Ptl00. The experimental results shown in Table 1 and Table 2. Table 1 meter for temperature compensation is not the experimental data of Table 2 meters to restore more than compensated experimental data show that the experimental data , instruments for temperature compensation is not in full scale, the maximum error is 4.5 ℃; while making compensation, the full scale of the maximum error reduced to 0.4 ℃,[link widoczny dla zalogowanych], the relative error is less than 0.2 %. 5 Conclusion This method does not measure the ambient temperature, but the resistance as measured by two standard calibration status of the intermediate state and transfer the amount of software to automate the reduction of temperature drift compensation, calibration methods and calibration of zero just like the ordinary instrument and full-scale, so simple, practical, and has high accuracy. If the meter is a current or voltage input signal, just pass the amount of change between two fixed voltage. If you use other A / D converter chip, the software can make a little change. [References [1] Fangqiu Hua,[link widoczny dla zalogowanych], Mao Pei, Tian Xinqi, et al. eddy current sensors automatically compensate for temperature drift [J]. Scientific Instrument, 1997,18 (2) :198-201. [2] Lu Yang, HAN Jiang, Wei Zhen, et al. platinum resistance temperature compensation method for temperature measurement system [J]. Scientific Instrument, 2000,21 (3) :225-257, 262. [ ,],[
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