CN101846558B - Main board for thermometer and thermocouple precision correcting method - Google Patents

Main board for thermometer and thermocouple precision correcting method Download PDF

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CN101846558B
CN101846558B CN2010102005317A CN201010200531A CN101846558B CN 101846558 B CN101846558 B CN 101846558B CN 2010102005317 A CN2010102005317 A CN 2010102005317A CN 201010200531 A CN201010200531 A CN 201010200531A CN 101846558 B CN101846558 B CN 101846558B
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circuit
thermocouple
potential
zero
thermometer
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CN2010102005317A
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CN101846558A (en
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张荣才
叶俊林
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北京市科海龙华工业自动化仪器有限公司
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Abstract

The invention relates to a main board for a thermometer and a thermocouple precision correcting method; the main board comprises a main control circuit consisting of a microprocessor, a dial-up input circuit, an interface circuit with at least two slots and a thermocouple sampling circuit; the invention controls the line structure of the sampling circuit with an A/D conversion circuit, reduces the line interference between digital and analog circuits, adds a zero calibration compensation circuit on the front end of the A/D conversion circuit and improves the accuracy of temperature measurement; the invention has the benefits that a bus-type interface circuit is adopted, and a plurality of interface circuit sockets are arranged to realize the extendibility of functions; the A/D conversion circuit is connected with the control end of the analog circuit, thereby reducing the connecting lines between the digital and the analog circuits, reducing the interference of the analog circuit to the digital circuit, and improving the work reliability; and the invention adds the zero calibration compensation circuit, so that when a zero point tends to be negative, the adjustment is very convenient, thereby preventing nonlinear zero-crossing error, and improving the accuracy of temperature measurement.

Description

一种测温仪用主板及热电偶精度校正方法 One kind of a board and a thermocouple thermometer accuracy correction method

技术领域 FIELD

[0001] 本发明属于冶金炉热工测温装置,特别涉及一种测温仪用主板及热电偶精度校正方法。 [0001] The present invention pertains to thermal metallurgical furnace temperature measuring device, particularly to a motherboard with a thermometer and a thermocouple accuracy correction method.

背景技术 Background technique

[0002] 目前冶炼金属熔液测温仪,由于测量现场工况条件复杂因此所用测温仪必须要操作简单,稳定可靠;而目前的测温仪经常需要设定参数,其参数的设定采用的是排式多位拨码盘,需要打开机箱在主板上操作,既不方便也不安全,而且主板的接口电路没有扩充功能,随着技术的进步需要不断地增加功能,因此主板上的接口电路应该满足扩充的需要。 [0002] It smelting molten metal thermometer, because the field working conditions so that the complex measurement with the thermometer must be simple, reliable; and now often need to set parameters of the thermometer, using the parameters set is the number of rows of formula thumbwheels, to open it for operation on the motherboard, inconvenient and unsafe, and an interface circuit board without the extension, as the technology advances require constantly increasing function, so the interface on the motherboard circuit should meet the needs of expansion. 并且目前的主板的热电偶测量精度校正,还沿用传统的模拟电路校正,在校准中需要调节主板中控制电路的电位器来校正,在使用中由于振动,电位器的阻值会发生微小变化,由于这种微小变化改变了校正电位,进而出现测量误差影响测温的测量精度。 And current measurement accuracy correction thermocouple motherboard further corrected using the traditional analog circuits, needed in the calibration adjustment potentiometer in the control circuit of the motherboard corrected, in use, due to vibration, the potentiometer resistance has small variations, due to this slight change alters correcting potential, then there affect the measurement accuracy of the temperature measurement errors.

发明内容 SUMMARY

[0003] 本发明的目的是提出一种测温仪用主板及热电偶精度校正方法技术方案,该方案采用串行接口总线方式在主板上设置多个接口板插口,实现了常用参数设定键脱离主板, 增加了零点校正电路提高了热电偶的测量精度,采用旋码拨盘取代排式多位拨码盘,减少数字与模拟线路的交叉连线减少了模拟电路对数字电路的干扰。 [0003] The object of the present invention is to provide a motherboard with a thermometer and a thermocouple accuracy correction method aspect, this scheme uses a serial interface bus interface board provided a plurality of sockets on the motherboard, to achieve a common parameter setting key from the motherboard increased improve the measurement accuracy of zero point correction thermocouple circuit, a spin-row multi-bit code dial substituted thumbwheels, reduce the number of analog lines connecting intersection reduces interference digital circuit analog circuit.

[0004] 为实现上述目的,本发明的技术方案是:一种测温仪用主板,包括含微处理器的主控电路和外围电路,所述外围电路包括拨码输入电路和至少有两个插槽的接口电路、热电偶采样电路;所述热电偶采样电路包括温度测量控制电路、A/D转换电路和校零补偿电路; [0004] To achieve the above object, the technical solution of the present invention is: A thermometer with a motherboard, comprising a control circuit comprising a microprocessor and a peripheral circuit, the peripheral circuit comprises an input circuit and DIP have at least two slot interface circuit, thermocouple sampling circuit; said sampling circuit comprises a temperature measuring thermocouple control circuit, a / D conversion circuit and a zero-calibration compensating circuit;

[0005] 所述温度测量控制电路包括双路多位开关和标准电源,其中标准电源提供热电偶的标准校正满度电位和零电位;所述双路多位开关是双路四选一无触点开关电路,其中一路开关的选择端X接热电偶输入,另一路选择端Y经放大器接至A/D转换电路,选择端X的四路被选择端中至少有一路通过有源电阻分压接入一电位,选择端Y的四路被选择端其中一路接标准电源,选择端Y的四路被选择端其中另一路接热电偶输入; [0005] The temperature measuring circuit comprises a control switch and a standard multi-bit dual power supply, power supply wherein a standard full-scale calibration standard thermocouple potential and zero potential; the number of two-way switch is selected from a non-contact dual quad point switching circuit, wherein the selection of one switch is connected to thermocouple input terminal X, the other end of select passage Y through an amplifier connected to the a / D conversion circuit, four selection terminal X is selected ends of at least all the way through the active voltage dividing resistor access a potentiometer, a four-way selection terminal Y is selected standard power terminal connected to the way in which, of the four selected terminal Y is connected to selected terminal wherein the other way thermocouple input;

[0006] 所述校零补偿电路包括一个多位选择开关和分压器,所述多位选择开关是双路四选一无触点开关电路,双路四选一无触点开关电路的一路选择端接所述放大器的参考电位输入端,一路选择端的多位被选则端分别连接分压器的不同分压电位。 [0006] The multi-bit-zero compensation circuit includes a voltage divider and a selection switch, the selection switch is a multi-bit dual quad selected from a non-contact switch circuit, a dual-four non-contact switch circuit is selected from the way selected terminating reference potential of the amplifier input terminal, all the way to select a number of the selected terminal is respectively connected to different ends of divided potential divider.

[0007] 所述的接口电路是串行总线接口电路。 [0007] The interface circuit is a serial bus interface circuit.

[0008] 所述的分压器是由多个电阻串联与电源连接组成。 [0008] The voltage divider are connected by a plurality of resistors in series with the power supply.

[0009] 所述的热电偶标准校正满度电位是分度号为S或R或B热电偶的16. 777mv或ISmv 或分度号为WRe热电偶的33mv。 [0009] The standard calibration thermocouple span potentiometers indexing number is S or R or B thermocouple 16. 777mv or ISmv or dividing number WRe thermocouple 33mv.

[0010] 所述温度测量控制电路中的双路多位开关和校零补偿电路中的多位选择开关的控制端与A/D转换电路的控制输出连接。 [0010] The temperature measuring circuit in the multi-bit control switches and a number of dual-zero compensation circuit of the selection control terminal of the switch and a control output A / D conversion circuit.

[0011 ] 所述的拨码输入电路是旋码盘拨码输入电路。 DIP input circuit [0011] The code wheel is a rotary dial code input circuit. [0012] 所述的插槽是沈线双面直插槽。 [0012] The slots are straight-sided slots sink line.

[0013] 一种测温仪用主板热电偶精度校正方法,包括零点校正和热电偶满度校正,具体步骤包括: [0013] A thermocouple thermometer with a motherboard accuracy correction method, comprising the zero calibration and full correction thermocouple, the specific steps include:

[0014] a.接收一个零点电位,即主控电路通过控制测温控制电路输出零电位至微处理器; . [0014] a receiving a zero potential, i.e. zero potential control circuit outputs to the microprocessor through the control temperature control circuit;

[0015] b.判断是否为负电位,如果是负电位,微处理器输出控制信号到A/D转换电路改变放大器参考点位使其为正电位; . [0015] b is determined whether a negative potential, if a negative potential, the microprocessor outputs a control signal to the A / D conversion circuit changes the reference point so that the amplifier has a positive potential;

[0016] c.将测得的正偏差电位存至零点校正寄存器; . [0016] c a positive bias potential to the measured zero point correction storage registers;

[0017] d.测量一个标定热电偶电位值; . [0017] d a calibrated thermocouple measured potential value;

[0018] e.将测得的标定热电偶电位值减去零点校正寄存器中的数据,得到热电偶满度值; . [0018] e the measured value obtained by subtracting the potential of the thermocouple calibration zero point correction data register, a thermocouple to obtain full-scale value;

[0019] 热电偶测量精度校正步骤是: [0019] thermocouple measurement accuracy correction steps are:

[0020] f.设置一个热电偶温度与电位关系表; . [0020] f is provided with a thermocouple potential table;

[0021] g.测量一个标定电位,根据公式:标定热电偶电位值={ (AD - ADz) - (ADf -ADz) }XK,标定常数K值,其中AD为标定电位,所述标定电位等于标定热电偶电位值,ADf为温度满度校正值,ADz为温度表零点值; . [0021] g a nominal electrical potential measurements, according to the equation: Calibration thermocouple potential value = {(AD - ADz) - (ADf -ADz)} XK, the value of the calibration constant K, wherein AD is the nominal electrical potential, the potential equal to the nominal thermocouple calibration potential value, ADf full-temperature correction values, ADz zero point value for the thermometers;

[0022] h.测量的温度值根据测定热电偶电位值通过公式:热电偶电位值={ (ADe -ADz) + (ADf - ADz) } XK从关系表中取得,其中ADe是热电偶电位实际动态测量值; [0022] h based on the measurement temperature measured by a thermocouple potential value equation: thermocouple potential value = {(ADe -ADz) + (ADf - ADz)} XK obtained from the relational table, where ADE is the actual thermocouple potential dynamic measurements;

[0023] 所述热电偶温度与电位关系表是分度号为S或R或B或WRe的热电偶不同温度时所对应的不同电位值表。 [0023] The thermocouple is the potential of the indexing relation table No. thermocouple different temperatures corresponding to different potential values ​​in Table B, or R or S or a WRe.

[0024] 所述标定热电偶电位值为分度号为S或R或B热电偶的16. 777mv或ISmv或分度号为WRe热电偶的33mv。 [0024] The nominal voltage value of thermocouple indexing number is S or R or B thermocouple 16. 777mv or ISmv or dividing number WRe thermocouple 33mv.

[0025] 本发明的有益效果是: [0025] Advantageous effects of the present invention are:

[0026] 1.本发明采用总线式接口电路,设置了多个接口电路插座实现了功能的可扩充; [0026] 1. The present invention uses bus interface circuit, the interface circuit is provided with a plurality of outlets of the extension may be achieved;

[0027] 2.本发明采用A/D转换电路与模拟电路的控制端连接,减少了数字电路与模拟电路的连线降低了模拟电路对数字电路的干扰,提高了工作的可靠性; [0027] 2. The present invention employs the A / D conversion terminal of the control circuit is connected to the analog circuit, reducing the digital and analog circuits reduces the interference connection to the digital circuit analog circuit, improve the reliability of the work;

[0028] 3.本发明加入了校零补偿电路使得当零点偏负时可以很方便的调整过来,避免了过零点非线性误差,提高了温度测量的准确性; [0028] 3. The present invention adds a compensation circuit such that the correction zero when negative zero offset can easily adjust, to avoid zero crossings nonlinearity error, improve the accuracy of temperature measurement;

[0029] 4.本发明结构简单,操作方便。 Structure [0029] 4. The present invention is simple and easy to operate.

[0030] 下面结合附图和实施例对本发明作一详细描述。 Drawings and embodiments of the present invention will hereinafter be described in detail [0030] below in conjunction.

附图说明 BRIEF DESCRIPTION

[0031] 图1为本发明电路逻辑框图; [0031] FIG. 1 a block diagram of a logic circuit of the present invention;

[0032] 图2为本发明温度测量控制和校零补偿电路图。 [0032] FIG 2 is a temperature measurement and control circuit diagram of a zero calibration compensation invention.

具体实施方式 Detailed ways

[0033] 实施例1 : [0033] Example 1:

[0034] 一种测温仪用主板实施例,参见图1和图2,所述主板包括含微处理器的主控电路1和外围电路,所述外围电路包括拨码输入电路2和至少有两个插槽3的接口电路、热电偶采样电路4 ;所述热电偶采样电路包括温度测量控制电路4-1、A/D转换电路4-2和校零补偿电路4-3 ;所述的插槽是沈线双面直插槽,本实施例为三个沈线双面直插槽。 [0034] A thermometer embodiment, see FIG. 1 and FIG. 2 embodiment with a main board including a control circuit comprising a microprocessor and a peripheral circuit, the peripheral circuit comprises an input circuit 2, and DIP least the interface circuit of two slots 3, 4 thermocouple sampling circuit; said sampling circuit comprises a thermocouple temperature measurement and control circuit 4-1, a / D conversion circuits 4-2 and 4-3-zero compensation circuit; said Shen straight sided slots are slot line, the present embodiment is a three-sided sink straight line slot.

[0035] 所述温度测量控制电路包括双路多位开关4-1-1和标准电源4-1-2,其中标准电源提供热电偶的标准校正满度电位和零电位;所述双路多位开关是双路四选一无触点开关电路,其中一路开关的选择端X接热电偶输入,另一路选择端Y经放大器4-4接至A/D转换电路,选择端X的四路被选择端中至少有一路通过有源电阻分压接入一电位(实施例中通过通过电阻Rl和Rl串联接电源分压),选择端Y的四路被选择端其中一路接标准电源,选择端Y的四路被选择端其中另一路接热电偶7 ; [0035] The temperature measuring circuit comprises a dual control switch number 4-1-1 and 4-1-2 standard power supply, wherein the power supply provides a standard full-scale calibration standard thermocouple potential and zero potential; the way multiplexor dual quad switch is selected from a non-contact switch circuit, wherein the selection of one switch is connected to thermocouple input terminal X, the other end of select passage Y through an amplifier 4-4 is connected to four a / D converting circuit, the selection terminal X end at least is selected by way of active access a potential dividing resistors (embodiment by dividing the series connection of the power supply through resistors Rl and Rl), a four-way selection terminal Y is connected to selected terminal wherein the way standard power, select Y is selected terminal end of four contact thermocouple 7 wherein the other way;

[0036] 所述校零补偿电路包括一个多位选择开关4-3-1和分压器4-3-2,所述多位选择开关是双路四选一无触点开关电路,双路四选一无触点开关电路的一路选择端接所述放大器的参考电位输入端,一路选择端的多路被选则端分别连接分压器的分压电位,所述的分压器是由多个电阻串联后与电源连接组成(实施例中是通过R3 R4、R5串联与电源连接组成);采用校零补偿电路的目的是:当零点电位偏负值时,通过改变放大器的参考电位使其零点漂移为正值,然后通过程序进行数字校零,此方法解决了当零点电位为负值时,虽然可以通过数字可以校零,但在测量时电位会产生过零点非线性误差,将零点偏差调制为正值, 使其测量值始终处于线性,减少了测量误差。 [0036] The multi-bit-zero compensation circuit includes a voltage divider select switch 4-3-1 and 4-3-2, the multi-bit selection switch is selected from a non-contact four-way switching circuit, dual four non-contact switch circuit is selected from a choice of the way of the end of the reference potential input terminal of the amplifier, the way selection terminal of the multiplexer is selected from the divided potential terminal connected to the voltage divider, the voltage divider is a multi- resistors connected in series to the power supply after the composition (by Example R3 R4, R5 are connected in series to the power source composition); Objective-zero compensation circuit comprises: a negative bias when the potential of 0:00, by changing the reference potential so that the amplifier zero drift is positive, then by digital calibration procedure, this method resolved when the negative potential is 0:00, although the digital correction can be zero, but in the measurement of the potential non-linear error generated zero crossing, zero point deviation modulation is positive, so that the measured values ​​is always linear, the measurement error is reduced.

[0037] 实施例中所述微处理器选用的是ATMEGA162八位微处理器,所述A/D转换电路的A/D转换器选用的是MAX132十八位A/D转换器,所述双路多位开关和多位选择开关选用的是4052双路四选一无触点开关。 [0037] Example embodiments of the microprocessor is selected ATMEGA162 eight microprocessor, A said A / D converting circuit A / D converter used is eighteen MAX132 A / D converter, the bis multiple way switch and multiple choice selection switch 4052 is selected from a dual four non-contact switch.

[0038] 所述的接口电路是串行总线接口电路,它是由连接微处理器的总线驱动器5驱动,本实施例驱动器采用的型号是SN75452B。 [0038] The interface circuit is a serial bus interface circuit, which is driven by a bus driver connected to the microprocessor 5, the model used in the present embodiment drives embodiment is SN75452B.

[0039] 所述的拨码输入电路是旋码盘6拨码输入电路,本实施例采用六个旋码盘和74LS165组成了拨码输入电路。 Dip the [0039] code wheel rotating the input circuit is an input circuit DIP 6, the present embodiment employs six 74LS165 rotating code wheel and the input circuit composed of the DIP.

[0040] 所述的热电偶标准校正满度电位是分度号为S或R或B热电偶的16. 777mv或ISmv 或分度号为WRe热电偶的33mv。 [0040] The standard calibration thermocouple span potentiometers indexing number is S or R or B thermocouple 16. 777mv or ISmv or dividing number WRe thermocouple 33mv.

[0041] 所述温度测量控制电路中的双路多位选择开关和所述校零补偿电路中的多位选择开关的控制端与A/D转换电路的控制输出连接,实施例中MAX132十八位A/D转换器有四位控制输出,将四位控制输出的每两位分别连接两个多位选择开关,因此在线路板中模拟电路部分没有数据线,而数据线只连接到A/D转换器,减小了数模的相互干扰,提高了测量过程的稳定性和可靠性。 [0041] Dual multi-bit control the temperature measuring circuit and the correction number selection switch circuit to select the offset-zero control terminal and the control output switch A / D conversion circuit, eighteen embodiments MAX132 bit a / D converter has four control outputs, the selection switches are connected to more than two per two four control output, there is no data lines in the analog circuit board, while the data lines is only connected to the a / D converter, a digital to analog reduces mutual interference, improve the stability and reliability of the measurement process.

[0042] 实施例2 : [0042] Example 2:

[0043] 一种测温仪用主板热电偶精度校正方法实施例,参见实施例1 :该方法包括零点校正和热电偶满度校正,具体步骤包括: [0043] A thermocouple thermometer embodiment with accuracy correction method according to the motherboard, see Example 1: the method comprising the zero calibration and full correction thermocouple, the specific steps include:

[0044] a.接收一个零点电位,即主控电路通过控制测温控制电路输出零电位至微处理器; . [0044] a receiving a zero potential, i.e. zero potential control circuit outputs to the microprocessor through the control temperature control circuit;

[0045] b.判断是否为负电位,如果是负电位,微处理器输出控制信号到A/D转换电路改变放大器参考点位使其为正电位; . [0045] b is determined whether a negative potential, if a negative potential, the microprocessor outputs a control signal to the A / D conversion circuit changes the reference point so that the amplifier has a positive potential;

[0046] c.将测得的正偏差电位存至零点校正寄存器;[0047] d.测量一个标定热电偶电位值; . [0046] c a positive bias potential to the measured zero point correction storage registers;. [0047] d thermocouple measured a potential calibration value;

[0048] e.将测得的标定热电偶电位值减去零点校正寄存器中的数据,得到热电偶满度值; . [0048] e the measured value obtained by subtracting the potential of the thermocouple calibration zero point correction data register, a thermocouple to obtain full-scale value;

[0049] 热电偶测量精度校正步骤是: [0049] The thermocouple measurement accuracy correction steps are:

[0050] f.设置一个热电偶温度与电位关系表; . [0050] f is provided with a thermocouple potential table;

[0051] g.测量一个标定电位,根据公式:标定热电偶电位值={ (AD - ADz) - (ADf -ADz) }XK,标定常数K值,其中AD为标定电位,所述标定电位等于标定热电偶电位值,ADf为温度满度校正值,ADz为温度表零点值; . [0051] g a nominal electrical potential measurements, according to the equation: Calibration thermocouple potential value = {(AD - ADz) - (ADf -ADz)} XK, the value of the calibration constant K, wherein AD is the nominal electrical potential, the potential equal to the nominal thermocouple calibration potential value, ADf full-temperature correction values, ADz zero value for the thermometers;

[0052] h.测量的温度值根据测定热电偶电位值通过公式:热电偶电位值={ (ADe -ADz) + (ADf - ADz) } XK从关系表中取得,其中ADe是热电偶电位实际动态测量值; [0052] h based on the measurement temperature measured by a thermocouple potential value equation: thermocouple potential value = {(ADe -ADz) + (ADf - ADz)} XK obtained from the relational table, where ADE is the actual thermocouple potential dynamic measurements;

[0053] 所述热电偶温度与电位关系表是分度号为S或R或B或WRe的热电偶不同温度时所对应的不同电位值表。 [0053] The thermocouple is the potential of the indexing relation table No. thermocouple different temperatures corresponding to different potential values ​​in Table B, or R or S or a WRe.

[0054] 所述标定热电偶电位值为分度号为S或R或B热电偶的16. 777mv或ISmv或分度号为WRe热电偶的33mv。 [0054] The nominal voltage value of thermocouple indexing number is S or R or B thermocouple 16. 777mv or ISmv or dividing number WRe thermocouple 33mv.

[0055] 所述热电偶温度与电位关系表是分度号为S或R或B或WRe的热电偶不同温度时所对应的不同电位值表;热电偶温度与电位关系表是一种已知图表,特别是用于金属溶液的1500度以上的高温热电偶其对应关系相当稳定可以在标准产品中查到。 [0055] The thermocouple is the potential of the indexing relation table No. thermocouple different temperatures corresponding to different potential values ​​in Table B, or S or R or WRe; a thermocouple and is a known potential table chart, especially for high temperature above 1500 degrees metal thermocouple which was quite stable correspondence may be found in standard products.

[0056] 此种方法是当零点电位偏负值时,通过改变放大器的参考电位使其零点漂移为正值,然后通过程序进行数字校零,此方法解决了当零点电位为负值时,虽然可以通过数字可以校零,但在测量时电位会产生过零点非线性误差,将零点偏差调制为正值,使其测量值始终处于线性,减少了测量误差。 [0056] When such a method is 0:00 negative bias potential, by changing the reference potential of the amplifier so that zero drift is positive, then by digital calibration procedure, this method resolved when the negative potential is 0:00, although zero calibration may be digital, but in the measurement of the potential non-linear error generated zero crossing, zero point deviation is positive modulation, so that the measured values ​​is always linear, the measurement error is reduced.

Claims (9)

1. 一种测温仪用主板,包括含微处理器的主控电路和外围电路,其特征在于,所述外围电路包括拨码输入电路和至少有两个插槽的接口电路、热电偶采样电路;所述热电偶采样电路包括温度测量控制电路、A/D转换电路和校零补偿电路;所述温度测量控制电路包括双路多位开关和标准电源,其中标准电源提供热电偶的标准校正满度电位和零电位;所述双路多位开关是双路四选一无触点开关电路,其中一路开关的选择端X接热电偶输入,另一路选择端Y经放大器接至A/D转换电路,选择端X的四路被选择端中至少有一路通过有源电阻分压接入一电位,选择端Y的四路被选择端其中一路接标准电源,选择端Y的四路被选择端其中另一路接热电偶输入;所述校零补偿电路包括一个多位选择开关和由分压器, 所述多位选择开关是双路四选一无触点开关电路,所述多位 A thermometer with a motherboard, comprising a control circuit comprising a microprocessor and a peripheral circuit, wherein said peripheral circuit comprises an input circuit and the DIP interface circuit having at least two slots, thermocouple sampling circuit; said sampling circuit comprises a temperature measuring thermocouple control circuit, a / D conversion circuit and the correction circuit of the offset-zero; measuring a temperature control circuit comprises a two-way switch and a number of standard power supply, wherein the power supply provides a standard calibration standard thermocouple zero and span potentiometers potential; said switch is a dual four-way multi-bit selected from a non-contact switch circuit, wherein the selection terminal X connected to thermocouple input, all the way to another way selection switch terminal Y via an amplifier connected to a / D conversion circuit, four selection terminal X is selected ends of at least all the way through the active access a voltage dividing resistor, the terminal Y is selected is selected four standard power terminal connected to the way in which, of the four selected terminal Y is selected wherein the contact end of another thermocouple input channel; said multi-bit-zero compensation circuit includes a voltage divider and a selection switch, the selection switch is a multi-bit dual quad selected from a non-contact switch circuit, the multi-bit 择开关的双路四选一无触点开关电路的一路选择端接所述放大器的参考电位输入端,一路选择端的多位被选则端分别连接分压器的不同分压电位。 Four-way selector switch selected from a non-contact switch circuit in the end all the way to select the reference potential input terminal of the amplifier, all the way to select a number of selected terminals respectively connected to different ends of the divided potential divider.
2.根据权利要求1所述的一种测温仪用主板,其特征在于,所述的接口电路是串行总线接口电路。 A thermometer according to claim 1 with a motherboard, wherein said interface circuit is a serial bus interface circuit.
3.根据权利要求1所述的一种测温仪用主板,其特征在于,所述的分压器是由多个电阻串联后与电源连接组成。 3. A thermometer according to claim 1 with a motherboard, wherein said voltage divider is connected in series with the power supply after a plurality of resistors.
4.根据权利要求1所述的一种测温仪用主板,其特征在于,所述的热电偶标准校正满度电位是分度号为S或R或B热电偶的16. 777mv或ISmv或分度号为WRe热电偶的33mv。 4. A thermometer according to any preceding claim 1 with a motherboard, characterized in that said thermocouple voltage is full-scale calibration standard indexing number is S or R or B thermocouple 16. 777mv or ISmv or No. WRe indexing thermocouple 33mv.
5.根据权利要求1所述的一种测温仪用主板,其特征在于,所述温度测量控制电路中的双路多位开关和所述校零补偿电路中的多位选择开关的控制端与A/D转换电路的控制输出连接。 A thermometer according to claim 1 with a motherboard, wherein the temperature measurement than double switch control circuit and the correction circuit of the offset-zero multi-bit selection control terminal of the switch connected to the control output a / D conversion circuit.
6.根据权利要求1所述的一种测温仪用主板,其特征在于,所述的拨码输入电路是旋码盘拨码输入电路。 A thermometer according to claim 1 with a motherboard, wherein said input circuit is a DIP DIP code wheel rotating the input circuit.
7.根据权利要求1所述的一种测温仪用主板,其特征在于,所述的插槽是沈线双面直插槽。 A thermometer according to claim 1 with a motherboard, wherein said slots are straight-sided slots sink line.
8. —种测温仪用主板热电偶精度校正方法,包括有权利要求1所述一种测温仪用主板,其特征在于,所述测温仪用主板热电偶精度校正方法包括零点校正和热电偶满度校正, 具体步骤包括:a.接收一个零点电位,即主控电路通过控制测温控制电路输出零电位至微处理器;b.判断是否为负电位,如果是负电位,微处理器输出控制信号到A/D转换电路改变放大器参考点位使其为正电位;c.将测得的正偏差电位存至零点校正寄存器;d.测量一个标定热电偶电位值;e.将测得的标定热电偶电位值减去零点校正寄存器中的数据,得到热电偶满度值;热电偶测量精度校正步骤是:f.设置一个热电偶温度与电位关系表;g.测量一个标定电位,根据公式:标定热电偶电位值={ (AD — ADz) + (ADf — ADz) }XK, 标定常数K值,其中AD为标定电位,所述标定电位等于标定热电偶电位值, 8. - Species Board thermocouple thermometer with accuracy correction method, comprising a motherboard with A thermometer as claimed in claim, wherein said main board with a thermocouple thermometer accuracy correction method includes correcting the zero point and thermocouples full correction, specifically comprises: a receiving a zero potential, i.e. zero potential control circuit by the control circuit outputs to the microprocessor controlling temperature; B determines whether a negative potential, if a negative potential, the microprocessor. output control signal to the a / D conversion amplifier circuit changes the reference point so that a positive potential;. c the positive bias potential to the measured zero point correction storage registers;. d thermocouple potential measuring a calibration value;. e the measured thermocouple calibration value obtained by subtracting the potential of the zero point correction register, a thermocouple to obtain full-scale value; thermocouple measurement accuracy correction step is:.. f provided with a thermocouple potential table; G measuring a calibration potential, according to the formula: calibration thermocouple potential value = {(AD - ADz) + (ADf - ADz)} XK, the value of the calibration constant K, wherein AD is the nominal electrical potential, the potential equal to the nominal calibration thermocouple potential value, ADf为温度满度校正值,ADz为温度表零点值;h.测量的温度值根据测定热电偶电位值通过公式:热电偶电位值=((ADe -ADz) + (ADf - ADz) } XK从关系表中取得,其中ADe是热电偶电位实际动态测量值;所述热电偶温度与电位关系表是分度号为S或R或B或WRe的热电偶不同温度时所对应的不同电位值表。 ADF is the full temperature correction values, ADz zero point value for the thermometers; H according to the temperature values ​​measured potential value measured by a thermocouple formula: thermocouple potential value = ((ADe -ADz) + (ADf - ADz)} XK from table acquired, wherein the actual dynamic ADe thermocouple potential measurement; thermocouple of the table is the potential number of indexing tables for different potential values ​​or R or S or B thermocouple WRe corresponding to different temperatures .
9.根据权利要求8所述的一种测温仪用主板热电偶精度校正方法,其特征在于,所述标定热电偶电位值为分度号为S或R或B热电偶的16. 777mv或ISmv或分度号为WRe热电偶的3!3mv。 9. A thermometer in accordance with claim 8, wherein said thermocouple accuracy correction method with the motherboard, characterized in that said calibration value of the potential of the thermocouple indexing number is S or R or B thermocouple 16. 777mv or ISmv or indexing thermocouple WRe No. 3! 3mv.
CN2010102005317A 2010-06-13 2010-06-13 Main board for thermometer and thermocouple precision correcting method CN101846558B (en)

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