Error compensation method of thermal resistance measurement by using multifunctional analogue signal circuit

An analog signal and error compensation technology, applied in the direction of measuring resistance/reactance/impedance, measuring electrical variables, measuring devices, etc., can solve problems such as inconvenient use, and achieve the effect of improving measurement accuracy and convenient measurement operation

Inactive Publication Date: 2003-02-05
ZHEJIANG SUPCON INSTR
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Problems solved by technology

Before the present invention was made, when measuring the thermal resistance for the multifunctional analog signal circuit, there was no error compensation method for the precision resistance R. In order to reduce the measurement error, the precision resistance was usually used as an external resistance. When measuring the current signal , connect the resistor, when measuring the thermal resistance, do not connect the resistor, this method is very inconvenient to use

Method used

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  • Error compensation method of thermal resistance measurement by using multifunctional analogue signal circuit
  • Error compensation method of thermal resistance measurement by using multifunctional analogue signal circuit
  • Error compensation method of thermal resistance measurement by using multifunctional analogue signal circuit

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Embodiment Construction

[0011] Measuring thermal resistance with a multi-functional analog signal circuit see figure 2 As shown, the multifunctional analog signal circuit includes a voltage input terminal A, a current input terminal B, a signal reference ground C, a microprocessor M, a precision resistor R connected between terminals B and C, and a precision resistor R connected between terminals A and C Between the switch K and the constant current source I series circuit, and two A / D converters respectively connected between A, B and the microprocessor, connect one end of the measured thermal resistance Rt to the voltage input end A , the other end is connected to the current input terminal B and the signal reference ground C terminal, the switch K is closed, the constant current source is used as the excitation current of the thermal resistance, and the microprocessor is used to compensate according to the following relationship to obtain the actual value of the thermal resistance Rt

[0012] ...

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Abstract

The configuration of the multiple functional analog signal circuit adopted in the invention includes following parts: the voltage input end A, the current input end B, Then signal reference ground C, microproceesor M, the precision resistor R, the switch K, the constant current source I and A/D converter. When the thermal resistance Rt being measured, the one end of Rt is connected to A, the other end is connected to B and C. The error compensation is carries out according to the following relational expression by using the microproceesor so as to obtain the actual value. The invented method provides the features of easy of operatino, full compensation for the thermal resistance measured.

Description

technical field [0001] The invention relates to a compensation method for thermal resistance measurement errors. Background technique [0002] In the field of industrial automation, some smart instruments or digital display instruments need to convert analog signals, such as voltage signals, current signals, thermal resistance signals, thermocouple signals (mv voltage signals), etc. into digital signals. There are two types of analog signal input circuits currently in use, one is a single-function analog signal input circuit, which only performs analog-to-digital conversion on a certain signal, and the other is a multi-function analog signal input circuit. figure 1 It is a commonly used multi-function analog signal input circuit, which includes a voltage input terminal A, a current input terminal B, a signal reference ground C, a microprocessor M, a precision resistor R connected between B and C terminals, and connected across A , the switch K betw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/02
Inventor 丁云褚敏王凯
Owner ZHEJIANG SUPCON INSTR
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