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A resistance signal source and resistance measurement circuit for eliminating lead wire resistance

A technology of resistance signal source and lead resistance, which is applied in the direction of measuring electrical variables, measuring resistance/reactance/impedance, measuring devices, etc., can solve the problems of complicated wiring and long sampling time, and achieve simplified software design, simple and convenient wiring, and shortened Effect of sampling period

Active Publication Date: 2017-07-28
ZHEJIANG SUPCON INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the problems existing in the above-mentioned prior art, the present invention proposes a resistance signal source and a resistance measurement system that eliminates the lead resistance. The lead resistance is eliminated by the internal circuit design, and only two-wire measurement is required, which solves the problems in the existing resistance measurement technology. Disadvantages such as complicated wiring and long sampling time

Method used

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  • A resistance signal source and resistance measurement circuit for eliminating lead wire resistance
  • A resistance signal source and resistance measurement circuit for eliminating lead wire resistance
  • A resistance signal source and resistance measurement circuit for eliminating lead wire resistance

Examples

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Embodiment 1

[0041] Such as figure 1 As shown, it is a schematic diagram of a resistance signal source for eliminating lead resistance in this embodiment, which includes a standard resistor 1 , a first voltage-controlled voltage source 2 and a second voltage-controlled voltage source 3 . The two ends of the standard resistance are respectively connected to the first connection line 4 and the second connection line 5, and the two free ports of the two connection lines are the first interface A and the second interface B respectively; the inverting input terminal of the first voltage-controlled voltage source 2 It is the third interface, the non-inverting input end is connected to the free end of the first connecting line 4, and the output end is connected to the other end of the first connecting line 4; the inverting input end of the second voltage-controlled voltage source 3 is the fourth interface, The non-inverting input end is connected to the free end of the second connection line 5 , ...

Embodiment 2

[0043] Such as figure 2As shown, it is a schematic diagram of the resistance signal source of this embodiment, which is different from Embodiment 1 in that the positive phase input terminal of the first voltage-controlled voltage source 2 is connected to the free end of the first connecting line 4, and the output terminal is connected to One end of the second connection line 5 connected to the standard resistance 1, the positive phase input terminal of the second voltage-controlled voltage source 3 is connected to the free end of the second connection line 5, and the output end is connected to the second connection line 5 and the standard resistance 1 The connected end is the same as that of Embodiment 1, and will not be repeated here.

[0044] Such as image 3 Shown is the circuit diagram of the resistance signal source of this embodiment. In this embodiment, the first voltage-controlled voltage source 2 includes a first high-precision instrument amplifier 4 and its periphe...

Embodiment 3

[0046] Such as Figure 4 As shown, it is a schematic diagram of the resistance signal source of this embodiment, which is different from Embodiment 1 in that the non-inverting input terminal is connected to the free end of the first connecting line 4, and the output terminal is connected to the other end of the first connecting line , the non-inverting input end of the second voltage-controlled voltage source 3 is connected to the free end of the second connection line 5, and the output end is connected to one end of the first connection line 5 connected to the standard resistor 1, and the others are the same as in Embodiment 1, here No longer.

[0047] The resistance measurement circuit of the resistance signal source for lead resistance elimination provided by the present invention includes the resistance signal source and the measurement device described in the above embodiments, and all interfaces of the resistance signal source are respectively connected to the measuremen...

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Abstract

The invention discloses a lead-resistance-removed resistance signal source and a resistance measuring system thereof. The resistance signal source comprises a standard resistor, a first voltage-controlled voltage source and a second voltage-controlled voltage source; two ends of the standard resistor are connected with a first connecting line and a second connecting line; free ends of the two connecting lines are respectively equipped with a first interface and a second interface; reverse phase input ends of the first voltage-controlled voltage source and the second voltage-controlled voltage source are respectively equipped with a third interface and a fourth interface; the first voltage-controlled voltage source and the second voltage-controlled voltage source are amplified -1 times and are respectively used f or removing the resistance of the leads at two ends. The resistance measuring system comprises the resistance signal source and a measuring device; the measuring device is connected with the first interface, the second interface, the third interface and the fourth interface of the resistance signal source through a first lead, a second lead, a third lead and a fourth lead. The resistance signal source and the resistance measuring system therefore are simple to wire and short in sampling time.

Description

technical field [0001] The invention relates to a resistance signal source, in particular to a resistance signal source for eliminating lead wire resistance and a resistance measurement system thereof. Background technique [0002] Any wire has resistance. The longer the length of the wire with the same material and cross-sectional area, the greater its resistance. When this wire is used as a lead wire to transmit signals, its own resistance is the lead resistance. The influence of lead wire resistance cannot be ignored in the AD sampling process. When it is too large to a certain extent, if the resistance of the lead wire is not eliminated, it will affect the accuracy of resistance sampling and cause signal measurement errors. Ordinary resistance signal sources, such as PT100, resistance box, precision resistance, etc., will cause deviations in resistance measurement when connected to leads with excessive resistance. [0003] There are two traditional resistance measuremen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/02
Inventor 童灵李堂忠田信吴婷廖利平郅杏利
Owner ZHEJIANG SUPCON INSTR
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