SU1037086A2 - Temperature taking device - Google Patents

Abstract

DEVICE FOR MEASURING TEMPERATURE by aut. St. 901846, distinguished by the fact that, in order to extend the functionality and measure measurement accuracy, a code comparison unit and a multiplexer are introduced into iiero, for which the control input is connected to the converter via a code comparison unit with a binary-decimal c4eT4Hka. signal of the thermal sensor in the time interval: shaft, and the outputs are connected to the inputs of the decades and in the installation in the binary-decimal counter.

Description

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About the Invention The invention relates to temperature measurement and can be used for accurate temperature measurements with numerical presentation of results. . According to the main iBBT. St. No. 901846 a device for measuring temperature is known, comprising a series-connected temperature sensor and a temperature sensor signal converter in a time interval, a key connecting the counting pulse generator with a binary and decimal counter, whose information input is connected to the information memory through a memory block. 1 output binary counter, output - with the input of the digital display unit ij. The drawbacks of the device are the inability to correct the readings of the sensors with a negative error of nonlinearity, as well as low measurement accuracy. The aim of the invention is to extend the functionality and increase the accuracy of the measurement device. This goal is achieved by the fact that a codec comparison unit and a multiplexer, in which a control input is connected to an output of a binary-ten counter through a code comparison block, are inserted into a temperature measurement device, the information input is connected to a temperature sensor signal converter in a time interval, and the outputs are connected to the inputs of the decade of a binary-time counter. FIG. 1 is a block diagram of the device for measuring temperature in FIG. 2 - curves of the number of pulses from temperature. The device contains a thermal sensor 1 connected in series, a thermometer sensor output distributor in time interval 2 and a key 3 connecting the generator 4 of counting pulses to a binary-decimal counter 5 connected to the digital display unit 6, and to a binary counter 7, block 8 the memory whose address input is connected to the information output of the binary counter, and the output is connected to the information output of the binary-decimal counter, block 9 of code comparison and multiplexer 10, the control input of which through the code comparison block connected to the output of a binary-decimal counter, the information input to the sensor of the temperature sensor in the time interval, and the outputs to the inputs of the installation in O and decades of the binary-decimal counter. The device works as follows. time. The output signal of the temperature sensor is converted into a time interval that controls the operation of the key for passing the pulses from the counting generator. pulses for binary decimal and binary pulses. The number of pulses counted by the counter determines the address in the permanent storage device. Under the address in the permanent storage device, a correction number is recorded that corresponds to the deviation of the conversion-from linear function at a given point, and those correction numbers that should be added to the contents of counter 5 are recorded in the forward code, and those that should be subtracted are in additional. The measurement range is divided into sections according to FIG. 2. Here N rJCT) is the dependence of the number of pulses at the input of counter 5 on temperature, N2. kT is the dependence of the number of pulses corresponding to the code at the output of the counter 5. of the temperature, where k is the proportionality coefficient. Correction numbers should be added at plot I, and subtraction at plot II. The parcel number is determined by the .9 comparison block, with a high level appearing at I segment and a low level at I section. At a high level at the output of the comparison block 9, the multiplexer 10 pass blocks the pulse of installation in ka 2 to the input of the installation in 0 decade counter 5, and at low, respectively to the input of the installation of decades of the counter 5 to 9. Thus, in section .1 before the start of the account in counter 5 records the correction number stored in memory block 8 in the forward code, i.e. Correction is the same as in the known device. After the end of the cycle, the measurements in the decade And decades of the counter 5 are not fixed, but are set to 9. After this, the correction number is written from the memory block 8 to the additional code, and the older decades of the counter 5 are not used for the correction, remain in the installation state at 9. The counting begins with this state. After the number of pulses at the input of the counter 5 is equal to the correction number, the addition of which was recorded in the counter 5 before the start of the counting, the transition is zero for all decades: the state after which the counting continues. Thus, the correction number is subtracted from the result. The ability to read the correction number makes it possible to correct the nonlinearity of the transformation function with both negative and positive values of the second derivative.

temperature sensor conversion functions.

In addition, the device allows the approximation to cross the transform function of the sensor M, which greatly narrows the range of the correction number. This, in turn, allows, with a constant volume of a permanently coupled device, to significantly reduce the cost of the lower bit of the correction number, and, consequently, to increase the accuracy of the measurement.

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Claims (1)

! DEVICE FOR TEMPERATURE MEASUREMENT by ed. St. No. 901846, which differs in that, in order to expand the functionality and improve measurement accuracy, a code comparison unit and a multiplexer are introduced in jiero, in which the control input is connected to the output of the binary-decimal counter via the code comparison unit, the information input is connected to the converter the signal of the temperature sensor in the time interval, and the outputs are connected to the inputs of the installation in `` 0 '' and * * 9 '' decades of the binary-decimal counter.