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Accurate resistor measuring apparatus and method thereof

A technology of precision resistance and measuring device, applied in measuring device, measuring electrical variable, measuring resistance/reactance/impedance, etc., can solve the problem of high cost, and achieve the effect of low cost, elimination of measurement error and good stability

Inactive Publication Date: 2009-08-05
CAMA LUOYANG ENVIRONMENTAL MEASUREMENT
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  • Application Information

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Problems solved by technology

This method requires a high-stable precision current source and a high-precision voltmeter, and the cost is relatively high

Method used

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  • Accurate resistor measuring apparatus and method thereof
  • Accurate resistor measuring apparatus and method thereof
  • Accurate resistor measuring apparatus and method thereof

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Embodiment

[0044] A precision resistance measurement device, wherein: one end of the resistance Rs to be measured is connected to the positive pole V+ of the power supply through the reference resistance Rbase and the current limiting resistance Rlim, and the other end of the resistance Rs to be measured is grounded (GND) through the bias resistance Rbias, and one of four is selected and two are crossed The four input terminals of the switch MUX are respectively connected to the two ends of the reference resistor Rbase and the resistance Rs to be measured, and are respectively used to receive the input terminal voltage bp, the output terminal voltage bn of the reference resistance Rbase, the input terminal voltage sp, The output terminal voltage sn, the first and second output terminals of the crossbar switch MUX are respectively connected to the same and inverting input terminals (in+, in-) of a buffer amplifier BUF, and the output terminal of the buffer amplifier BUF is connected to the ...

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Abstract

The invention relates to a precise resistance measuring device. One end of a resistor to be measured is connected to the anode of a power supply through a reference resistor and a current-limiting resistor, and the other end is grounded through a bias resistor; four input ends of a cross bar switch are respectively connected to two ends of the reference resistor and the resistor to be measured, and two output ends of the cross bar switch are respectively connected to the same-phase input end and the reverse-phase input end of a signal amplification circuit; the signal amplification circuit is connected to the data signal input end of a central processor through an A / D converter; the data signal output end of the central processor is connected with a memory; the control signal output end of the central processor is connected with the control signal input end of the cross bar switch to control the two output ends of the cross bar switch to sequentially output positive and negative voltage of two ends of the reference resistor and positive and negative voltage of two ends of the resistor to be measured; the positive and negative voltage of two ends of the reference resistor and the resistor to be measured is stored in the memory by the central processor through the processing by the signal amplification circuit and the A / D conversion by the A / D converter; and the central processor transfers the positive and negative voltage difference of the reference resistor and the positive and negative voltage difference of the resistor to be measured and carries out calculation to obtain the resistance value of the resistor to be measured.

Description

technical field [0001] The invention relates to a device and method for measuring the resistance value of precision resistors. Background technique [0002] At present, the conventional precision resistance measurement is to use a precision current source to apply current to the resistance to be measured, measure the voltage across the resistance, and then calculate the resistance value through the relationship between the current, voltage and resistance on the resistance to be measured. This method requires a highly stable and precise current source and a high-precision voltmeter, and the cost is relatively high. Contents of the invention [0003] The purpose of the present invention is to provide a precision resistance measuring device with high precision, high stability and low cost. Another purpose of the present invention is to provide a precision resistance measuring method for controlling the measuring device to perform automatic measurement. [0004] A precision r...

Claims

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Application Information

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IPC IPC(8): G01R27/02
Inventor 张德林滕军
Owner CAMA LUOYANG ENVIRONMENTAL MEASUREMENT
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