CN210572498U - Wire resistance measuring device - Google Patents
Wire resistance measuring device Download PDFInfo
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- CN210572498U CN210572498U CN201920990773.7U CN201920990773U CN210572498U CN 210572498 U CN210572498 U CN 210572498U CN 201920990773 U CN201920990773 U CN 201920990773U CN 210572498 U CN210572498 U CN 210572498U
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Abstract
The utility model relates to a wire measurement field discloses a wire resistance measuring device, be in including the circuit board and set up respectively programmable constant current source, voltage acquisition circuit, analog switch circuit, wire terminal, ARM treater, control button and display on the circuit board, the control button is used for the input control parameter, and ARM treater control programmable constant current source output sets for the operating condition of electric current and control analog switch circuit, and receives the voltage data of voltage acquisition circuit's collection, acquires wire resistance and shows through the display according to electric current and voltage relation. The utility model discloses simple structure, it is small, the wire that can support the multichannel carries out resistance measurement and break-make test.
Description
Technical Field
The utility model relates to a wire measurement field especially relates to a wire resistance measuring device.
Background
In the electronics industry, there are various types of power conductors or various communication lines that are subject to various rigorous tests. Including the make and break of the wires, the on-resistance, the insulation and whether the wire sequence is correct for the connector. Some current factories use simple multimeters, or simple on-off test instruments. The resistance of the lead cannot be correctly judged only by simply checking the on-off of the lead. There may be parts of the wire that do not touch well, but are considered to pass the measurement. And in some factories, the selected equipment is large and heavy, and expensive measuring equipment is adopted, so that the production cost is increased, and the competitiveness is not improved.
SUMMERY OF THE UTILITY MODEL
In order to overcome one of the deficiencies of the prior art, the utility model provides a simple structure, small, the high wire resistance measuring device of measurement accuracy.
The utility model provides a technical scheme that its technical problem adopted does:
the utility model provides a wire resistance measuring device, includes the circuit board and sets up respectively programmable constant current source, voltage acquisition circuit, analog switch circuit, wire terminal, ARM treater, control button and display on the circuit board, programmable constant current source is connected with voltage acquisition circuit and analog switch circuit's input respectively, and the one end of wire terminal is connected to analog switch circuit's output, and the other end ground connection of wire terminal, the ARM treater is connected with programmable constant current source, analog switch circuit, voltage acquisition circuit, control button and display respectively. The ARM processor controls the programmable constant current source to output set current, the voltage at two ends of the conducting wire is obtained through the voltage acquisition circuit, and the resistance value of the conducting wire is obtained according to the ohm law and displayed on the display. The embodiment has the advantages of simple structure, capability of replacing a conventional switch with an analog switch circuit, volume reduction, capability of supporting resistance measurement and on-off test of a multi-channel lead and very convenient use.
As a further improvement of the above scheme, the voltage acquisition circuit comprises a voltage amplification circuit and an AD conversion circuit which are connected with each other, an input end of the voltage amplification circuit is connected with an output end of the programmable constant current source, and an output end of the AD conversion circuit is connected with the ARM processor. The voltage amplifying circuit is used for amplifying the signal of the tested wire, so that the measurement accuracy is improved; the AD conversion circuit converts the amplified signal into a digital signal which can be processed by the ARM processor.
As a further improvement of the scheme, the analog switch circuit comprises at least one ADG1604BRUZ chip, wherein the input end of the ADG1604BRUZ chip is connected with the programmable constant current source, the output end of the ADG1604BRUZ chip is connected with the lead terminal, and the enabling end of the ADG1604BRUZ chip is connected with the ARM processor. Each ADG1604BRUZ chip has 4 outputs, and the ADG1604BRUZ chip replaces the conventional switch, thereby reducing the device size.
As a further improvement of the scheme, the number of the ADG1604BRUZ chips is 8, so that the analog switch circuit has 32 paths of output in total and can support 32 paths of resistance measurement.
As a further improvement of the scheme, the model of the ARM processor is STM32F103RET6, and the processing speed is high and the processing accuracy is high.
The beneficial effects of the utility model are that: the utility model discloses a wire resistance measuring device includes the circuit board and sets up respectively programmable constant current source, voltage acquisition circuit, analog switch circuit, wire terminal, ARM treater, control button and display on the circuit board, the control button is used for the input control parameter, and ARM treater control programmable constant current source output sets for the operating condition of electric current and control analog switch circuit, and the voltage data of the collection of voltage acquisition circuit is received, acquires wire resistance and shows through the display according to electric current and voltage relation. The utility model discloses simple structure, it is small, the wire that can support the multichannel carries out resistance measurement and break-make test.
Drawings
The present invention will be further described with reference to the accompanying drawings and specific embodiments, wherein:
fig. 1 is a block diagram of a wire resistance measuring device in a preferred embodiment of the present invention;
FIG. 2 is a pin connection diagram of an ARM processor in a preferred embodiment of the present invention;
fig. 3 is a schematic diagram of a voltage amplification circuit in a preferred embodiment of the present invention;
fig. 4 is a schematic diagram of an AD conversion circuit in a preferred embodiment of the present invention;
fig. 5 is a pin connection diagram of an ADG1604BRUZ chip in a preferred embodiment of the invention.
Detailed Description
The following further describes the embodiments of the present invention. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features related to the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Referring to fig. 1, a lead resistance measuring device comprises a circuit board, and a programmable constant current source 1, a voltage acquisition circuit 2, an analog switch circuit 5, a lead terminal 6, an ARM processor 4, a control key 7 and a display 3 which are respectively arranged on the circuit board, wherein the programmable constant current source 1 is respectively connected with the voltage acquisition circuit 2 and the input end of the analog switch circuit 5, the number of output paths of the analog switch circuit 5 corresponds to the number of the lead terminals 6, each output end of the analog switch circuit 5 is respectively connected with one end of the corresponding lead terminal 6, the other end of the lead terminal 6 is grounded, and during measurement, a measured lead is respectively arranged at two ends of the lead terminal 6. The ARM processor 4 is of the STM32F103RET6 type, and is high in operation speed and low in cost. Referring to fig. 2, the STM32F103RET6 chip is connected to the programmable constant current source 1, the analog switch circuit 5, the voltage acquisition circuit 2, the control key 7 and the display 3 respectively. In this embodiment, the ARM processor 4 controls the programmable constant current source 1 to output a set current to the analog switch circuit 5, the analog switch circuit 5 includes a total 32-way switch composed of 8 ADG1604BRUZ chips, see fig. 5, an input end of the ADG1604BRUZ chip is connected to the programmable constant current source 1, an output end of the ADG BRUZ chip is connected to the wire terminal 6, an enable end of the ADG BRUZ chip is connected to the ARM processor 4, and the ARM processor 4 controls a working state of the ADG1604BRUZ chip to switch a measured wire one by one. In other embodiments, the number of ADG1604BRUZ chips may be any integer no less than 1; ARM treater 4 acquires wire voltage through voltage acquisition circuit 2 to combine the electric current of setting, can draw the resistance of being surveyed the wire according to ohm's law, and show through display 3, can judge the break-make of wire and whether the wire resistance meets the requirements through the wire resistance. The embodiment has a simple structure, replaces a conventional switch with the analog switch circuit 5, reduces the volume, can support a multi-channel lead to carry out resistance measurement and on-off test, and is very convenient to use.
Further, the voltage acquisition circuit 2 includes a voltage amplification circuit 201 and an AD conversion circuit 202 which are connected to each other, referring to fig. 3 and fig. 4, the voltage amplification circuit 201 includes an operational amplifier, an input terminal IOUT of the operational amplifier is connected to an output terminal of the programmable constant current source 1, and an output terminal of the AD conversion circuit 202 is connected to an input pin of the ARM processor 4. The voltage amplifying circuit 201 is used for amplifying the signal of the tested lead, so that the measurement accuracy is improved; the AD conversion circuit 202 adopts a 16-bit high-precision AD conversion chip with the model number of ADs131a02IPBS, and the AD conversion circuit 202 converts the amplified signal into a digital signal that can be processed by the ARM processor 4.
In the embodiment, control parameters are input through the control key 7, different measurement current sizes are selected to adjust the gear of the measured resistor, and the embodiment supports three-gear measurement ranges of 0.001-3 Ω, 0-30 Ω and 0-300 Ω respectively. The corresponding measurement accuracy is 0.5% FS + -0.003 omega, 0.5% FS + -0.03 omega and 0.5% FS + -0.3 omega respectively. The display 3 in this embodiment adopts a 12864 display screen, and is small in size. In addition, the constant current source 1 able to programme in this embodiment can be replaced with the constant voltage source able to programme, and voltage acquisition circuit 2 replaces with current acquisition circuit, should regard as similar means to reach the utility model discloses a technological effect.
The above description is only a preferred embodiment of the present invention, but the present invention is not limited to the above embodiments, and the technical effects of the present invention should be all included in the protection scope of the present invention as long as the technical effects are achieved by any of the same or similar means.
Claims (5)
1. A wire resistance measuring device, characterized in that: including the circuit board and set up respectively programmable constant current source (1), voltage acquisition circuit (2), analog switch circuit (5), wire terminal (6), ARM treater (4), control button (7) and display (3) on the circuit board, programmable constant current source (1) is connected with the input of voltage acquisition circuit (2) and analog switch circuit (5) respectively, and the one end of wire terminal (6) is connected to the output of analog switch circuit (5), and the other end ground connection of wire terminal (6), ARM treater (4) are connected with programmable constant current source (1), analog switch circuit (5), voltage acquisition circuit (2), control button (7) and display (3) respectively.
2. The wire resistance measuring device according to claim 1, wherein: the voltage acquisition circuit (2) comprises a voltage amplification circuit (201) and an AD conversion circuit (202) which are connected with each other, the input end of the voltage amplification circuit (201) is connected with the output end of the programmable constant current source (1), and the output end of the AD conversion circuit (202) is connected with the ARM processor (4).
3. The wire resistance measuring device according to claim 1, wherein: the analog switch circuit (5) comprises at least one ADG1604BRUZ chip, wherein the input end of the ADG1604BRUZ chip is connected with the programmable constant current source (1), the output end of the ADG1604BRUZ chip is connected with the lead terminal (6), and the enabling end of the ADG1604BRUZ chip is connected with the ARM processor (4).
4. A wire resistance measuring device according to claim 3, wherein: the number of the ADG1604BRUZ chips is 8.
5. The wire resistance measuring device according to claim 1, wherein: the model of the ARM processor (4) is STM32F103RET 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920990773.7U CN210572498U (en) | 2019-06-27 | 2019-06-27 | Wire resistance measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920990773.7U CN210572498U (en) | 2019-06-27 | 2019-06-27 | Wire resistance measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210572498U true CN210572498U (en) | 2020-05-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920990773.7U Active CN210572498U (en) | 2019-06-27 | 2019-06-27 | Wire resistance measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210572498U (en) |
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2019
- 2019-06-27 CN CN201920990773.7U patent/CN210572498U/en active Active
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