CN110763919B - Method for measuring resistance measuring meter for measuring resistance value of thermal resistance lead - Google Patents
Method for measuring resistance measuring meter for measuring resistance value of thermal resistance lead Download PDFInfo
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- CN110763919B CN110763919B CN201911076733.2A CN201911076733A CN110763919B CN 110763919 B CN110763919 B CN 110763919B CN 201911076733 A CN201911076733 A CN 201911076733A CN 110763919 B CN110763919 B CN 110763919B
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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Abstract
The invention discloses a measuring method of a resistance measuring meter for measuring the resistance value of a thermal resistance lead, which comprises a wiring port module and a constant current source, wherein the wiring port module is provided with four detection ports, the constant current source is connected with the four detection ports of the wiring port module through a switch switching circuit, a digital-to-analog conversion circuit is connected with the detection ports through the switch switching circuit, the output end of the digital-to-analog conversion circuit is connected with a single chip microcomputer, and the single chip microcomputer is connected with a display screen of the resistance measuring meter. The invention is convenient and labor-saving in one-time wiring; the lead resistance is directly measured, and is correct and intuitive; the full-automatic machine tool has the advantages of being full-automatic, improving the working efficiency and avoiding introducing human errors.
Description
Technical Field
The invention relates to the technical field of measuring instruments, in particular to a four-wire resistance measuring meter.
Background
The industrial thermal resistors (such as Pt100, Cu50, etc.) are generally used for measuring temperature by adopting a two-wire system, a three-wire system or a four-wire system, the two-wire system and the three-wire system are generally used for measuring at present, the four-wire system has the highest measuring precision, the domestic four-wire system measuring circuit has almost no instrument, and the temperature measuring by the four-wire system is gradually popular in recent years due to the measuring precision. The resistance value of the lead of the four-wire thermal resistance sensor is required to be measured. The lead resistance has great reference significance for judging the connection quality, and the connection quality is one of the great influence quantity of the quality of the temperature signal.
At present, referring to fig. 1, the resistance values of the lead of the four-wire thermal resistor are measured by measuring the resistance values of Rab, Rac, Rad, Rbc, Rbd and Rcd, and then obtaining the resistance values of R1, R2, R3 and R4 (in fig. 1, R1, R2, R3 and R4 are all corresponding lead resistors) and the resistance value of the thermal resistor R0 through a calculation method. 6 times of manual wiring measurement is needed, time and labor are wasted, and human errors are easily introduced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a resistance measuring meter for measuring the resistance value of a thermal resistance lead.
The application is realized by the following technical scheme: the utility model provides a resistance measurement table of measurement thermal resistance lead resistance value, includes wiring port module, wiring port module has four detection port, its characterized in that: the constant current source is connected with four detection ports of the wiring port module through a switch switching circuit, a digital-to-analog conversion circuit is connected with the detection ports through the switch switching circuit, the output end of the digital-to-analog conversion circuit is connected with a single chip microcomputer, and the single chip microcomputer is connected with a display screen of the resistance measuring meter.
In the above technical solution, it is assumed that the leads connected to the four detection ports are L1, L2, L3, and L4, the leads L1 and L2 are connected to one end of the thermal resistor, and the leads L3 and L4 are connected to the other end of the thermal resistor.
The measuring method of the resistance measuring meter for measuring the resistance value of the thermal resistance lead is characterized by comprising the following steps of: firstly, two output ends of the constant current source are respectively connected with the starting ends of a lead L1 and a lead L3 through the switch switching circuit, meanwhile, the two output ends of the constant current source are respectively disconnected with the starting ends of the lead L2 and the lead L4, the voltage AV of the starting end of the lead L1 and the voltage BV of the tail end of the lead L1 are measured, the voltage values of two ends of the lead L1 are obtained through BV-AV, and the resistor R1 of the lead L1 is obtained through calculation because the current in the circuit is known;
secondly, measuring a voltage CV at the starting end of the lead L3 and a voltage DV at the tail end of the lead L3, obtaining a voltage value at two ends of the lead L3 through DV-CV, and obtaining a resistance R3 of the lead L3 through calculation because the current in the circuit is known;
thirdly, obtaining voltage values at two ends of the thermal resistor through BV-DV by using the BV obtained by measurement in the first step and the DV obtained by measurement in the second step, and obtaining a resistor R0 of the thermal resistor through calculation because the current in the circuit is known;
fourthly, two output ends of the constant current source are respectively connected with the starting ends of the lead L2 and the lead L4 through the switch switching circuit, meanwhile, the two output ends of the constant current source are disconnected with the starting ends of the lead L1 and the lead L3, the voltage BV of the starting end of the lead L2 and the voltage AV of the tail end of the lead L2 are measured, the voltage values of the two ends of the lead L2 are obtained through AV-BV, and the resistance R2 of the lead L2 is obtained through calculation because the current in the circuit is known;
and fifthly, measuring the voltage DV at the starting end of the lead L4 and the voltage CV at the tail end of the lead L4, obtaining the voltage value at two ends of the lead L4 through DV-CV, and obtaining the resistance R4 of the lead L4 through calculation because the current in the circuit is known.
In the above technical solution, in all the steps, the measured resistance is converted by the digital-to-analog conversion circuit and then transmitted to the display for display.
In the above technical solution, the calculations in all the steps are performed by the single chip microcomputer.
The invention has the following beneficial effects: 1) The one-time wiring is convenient and labor-saving; 2) the lead resistance is directly measured, and is correct and intuitive; 3) the full-automatic machine tool has the advantages of being full-automatic, improving the working efficiency and avoiding introducing human errors.
Drawings
FIG. 1 is a schematic diagram of the four-wire thermal resistor wiring.
Fig. 2 is a schematic structural diagram of the present invention.
Fig. 3 is a wiring diagram of the present invention in use.
Detailed Description
The invention is described in further detail below with reference to the following detailed description and accompanying drawings: referring to fig. 1 to 2, a resistance measuring meter for measuring a resistance value of a thermal resistance lead includes a connection port module 1, where the connection port module 1 has four detection ports, respectively: detection port a, detection port b, detection port c, and detection port d. The resistance measuring meter is characterized by further comprising a constant current source 2, wherein the constant current source 2 is connected with four detection ports of the wiring port module through a switch switching circuit 3, a digital-to-analog conversion circuit 4 is connected with the four detection ports through the switch switching circuit 3, the output end of the digital-to-analog conversion circuit 4 is connected with a single chip microcomputer 5, and the single chip microcomputer 5 is connected with a display screen 6 of the resistance measuring meter. The switch switching circuit 3 is used for switching excitation current of the constant current source to be connected to any two detection ports, a voltage measurement module is integrated in the switch switching circuit 3 and used for collecting voltage between the two detection ports connected with the excitation current, and voltage signals obtained through detection are converted into digital signals through the digital-to-analog conversion circuit 4.
Referring to fig. 3, the leads of the four detection ports are L1, L2, L3 and L4, respectively, the leads L1 and L2 are connected to one end of the thermal resistor R0, and the leads L3 and L4 are connected to the other end of the thermal resistor R0, respectively.
A measuring method of a resistance measuring meter for measuring the resistance value of a lead of a thermal resistor comprises the following steps that firstly, two output ends of a constant current source are respectively connected with the starting ends of the lead L1 and the lead L3 through a switch switching circuit, meanwhile, the two output ends of the constant current source are respectively disconnected with the starting ends of the lead L2 and the lead L4, the voltage AV of the starting end of the lead L1 and the voltage BV of the tail end of the lead L1 are measured, the voltage values of the two ends of the lead L1 are obtained through BV-AV, and the resistance R1 of the lead L1 is obtained through calculation because the current in the circuit is known;
secondly, measuring a voltage CV at the starting end of the lead L3 and a voltage DV at the tail end of the lead L3, obtaining a voltage value at two ends of the lead L3 through DV-CV, and obtaining a resistance R3 of the lead L3 through calculation because the current in the circuit is known;
thirdly, obtaining voltage values at two ends of the thermal resistor through BV-DV by using the BV obtained by measurement in the first step and the DV obtained by measurement in the second step, and obtaining a resistor R0 of the thermal resistor through calculation because the current in the circuit is known;
fourthly, two output ends of the constant current source are respectively connected with the starting ends of the lead L2 and the lead L4 through the switch switching circuit, meanwhile, the two output ends of the constant current source are disconnected with the starting ends of the lead L1 and the lead L3, the voltage BV of the starting end of the lead L2 and the voltage AV of the tail end of the lead L2 are measured, the voltage values of the two ends of the lead L2 are obtained through AV-BV, and the resistance R2 of the lead L2 is obtained through calculation because the current in the circuit is known;
and fifthly, measuring the voltage DV at the starting end of the lead L4 and the voltage CV at the tail end of the lead L4, obtaining the voltage value at two ends of the lead L4 through DV-CV, and obtaining the resistance R4 of the lead L4 through calculation because the current in the circuit is known.
In all the steps, the measured resistance is converted by a digital-to-analog conversion circuit and then is sent to the display for display. And the calculation in all the steps is carried out by the singlechip.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be appreciated by persons skilled in the art that the present invention is not limited by the embodiments described above. The foregoing embodiments and description of the invention have been provided for the purposes of illustrating the principles of the invention and is subject to various changes and modifications without departing from the spirit and scope of the invention. Such variations and modifications are intended to be within the scope of the claimed invention.
Claims (3)
1. The measuring method of the resistance measuring meter for measuring the resistance value of the lead of the thermal resistor comprises the resistance measuring meter for measuring the resistance value of the lead of the thermal resistor, the resistance measuring meter comprises a wiring port module and a constant current source, wherein the wiring port module is provided with four detection ports, the constant current source is connected with the four detection ports of the wiring port module through a switch switching circuit, a digital-to-analog conversion circuit is connected with the detection ports through the switch switching circuit, the output end of the digital-to-analog conversion circuit is connected with a single chip microcomputer, the single chip microcomputer is connected with a display screen of the resistance measuring meter, the lead wires connected with the four detection ports are respectively L1, L2, L3 and L4, the lead wires L1 and L2 are respectively connected with one end of the thermal resistor, and the lead wires L3 and L4 are respectively connected with the other end of the thermal resistor;
the method is characterized by comprising the following steps: firstly, two output ends of the constant current source are respectively connected with the starting ends of a lead L1 and a lead L3 through the switch switching circuit, meanwhile, the two output ends of the constant current source are respectively disconnected with the starting ends of the lead L2 and the lead L4, the voltage AV of the starting end of the lead L1 and the voltage BV of the tail end of the lead L1 are measured, the voltage values of two ends of the lead L1 are obtained through BV-AV, and the resistor R1 of the lead L1 is obtained through calculation because the current in the circuit is known;
secondly, measuring a voltage CV at the starting end of the lead L3 and a voltage DV at the tail end of the lead L3, obtaining a voltage value at two ends of the lead L3 through DV-CV, and obtaining a resistance R3 of the lead L3 through calculation because the current in the circuit is known;
thirdly, obtaining voltage values at two ends of the thermal resistor through BV-DV by using the BV obtained by measurement in the first step and the DV obtained by measurement in the second step, and obtaining a resistor R0 of the thermal resistor through calculation because the current in the circuit is known;
fourthly, two output ends of the constant current source are respectively connected with the starting ends of the lead L2 and the lead L4 through the switch switching circuit, meanwhile, the two output ends of the constant current source are disconnected with the starting ends of the lead L1 and the lead L3, the voltage BV of the starting end of the lead L2 and the voltage AV of the tail end of the lead L2 are measured, the voltage values of the two ends of the lead L2 are obtained through AV-BV, and the resistance R2 of the lead L2 is obtained through calculation because the current in the circuit is known;
and fifthly, measuring the voltage DV at the starting end of the lead L4 and the voltage CV at the tail end of the lead L4, obtaining the voltage value at two ends of the lead L4 through DV-CV, and obtaining the resistance R4 of the lead L4 through calculation because the current in the circuit is known.
2. The method of measuring a resistance meter for measuring a resistance value of a heat resistance lead according to claim 1, characterized in that: in all the steps, the measured resistance is converted by a digital-to-analog conversion circuit and then is sent to the display for display.
3. The method of measuring a resistance meter for measuring a resistance value of a heat resistance lead according to claim 1, characterized in that: and the calculation in all the steps is carried out by the singlechip.
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| CN201911076733.2A CN110763919B (en) | 2019-11-06 | 2019-11-06 | Method for measuring resistance measuring meter for measuring resistance value of thermal resistance lead |
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| CN201911076733.2A CN110763919B (en) | 2019-11-06 | 2019-11-06 | Method for measuring resistance measuring meter for measuring resistance value of thermal resistance lead |
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| CN110763919B true CN110763919B (en) | 2022-05-24 |
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| CN101937037A (en) * | 2009-07-01 | 2011-01-05 | 哈尔滨建成集团有限公司 | Device for automatically testing performance of cable bunch |
| CN103675459A (en) * | 2013-11-29 | 2014-03-26 | 上海华力微电子有限公司 | Method for measuring conductor resistance in integrated circuit |
| CN105717362B (en) * | 2016-04-22 | 2018-11-23 | 滨州学院 | Resistivity test device and method |
| CN109116117A (en) * | 2018-07-24 | 2019-01-01 | 刘怡然 | A kind of resistance measurement device and measurement method |
| CN109443599A (en) * | 2018-11-23 | 2019-03-08 | 沪东重机有限公司 | A kind of marine diesel thermal resistance automatic measurement system and measurement method |
| CN209280763U (en) * | 2018-12-03 | 2019-08-20 | 鹤源电子通讯配件(深圳)有限公司 | A kind of multi-thread electric resistance measuring apparatus of conductive sheet |
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Address after: 315400 No. 223, beibinjiang Road, Yuyao City, Ningbo City, Zhejiang Province Patentee after: Zhejiang Jinyi Instrument Co.,Ltd. Address before: 315400 No. 223, beibinjiang Road, Yuyao City, Ningbo City, Zhejiang Province Patentee before: YUYAO JINYI INSTRUMENT Co.,Ltd. |
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