CN202351327U - High precision circuit resistance tester - Google Patents
High precision circuit resistance tester Download PDFInfo
- Publication number
- CN202351327U CN202351327U CN2011204335400U CN201120433540U CN202351327U CN 202351327 U CN202351327 U CN 202351327U CN 2011204335400 U CN2011204335400 U CN 2011204335400U CN 201120433540 U CN201120433540 U CN 201120433540U CN 202351327 U CN202351327 U CN 202351327U
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- circuit
- high precision
- resistance tester
- switch
- correction unit
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Abstract
The utility model belongs to the technical field of testing equipment, and particularly relates to a high precision circuit resistance tester, which solves the technical problem of unreasonable design in the prior art, and includes an CPU (central processing unit), wherein a voltage sampling circuit and a current sampling circuit are connected on the CPU. The high precision circuit resistance tester is characterized in that a voltage correction unit is connected onto the voltage sampling circuit, and a current correction unit is connected onto the current sampling circuit. Compared with the prior art, the high precision circuit resistance tester has the advantages of reasonable design, simple structure, capability of efficiently reducing the temperature drift error, and conveniences for operation and use.
Description
Technical field
The utility model belongs to the testing apparatus technical field, especially relates to a kind of high precision circuit resistance tester.
Background technology
Circuit resistance tester is mainly used in the contact resistance of equipment such as measuring switch, isolating switch and transformer.Contact resistance value is smaller, and measuring current is greater than 100A.General with 4 line system mensurations.Electric current is measured voltage through the contact point of equipment under test from contact point, R=U/I.Mainly contain: compositions such as dc constant current power supply, control main board and LCD display.Above circuit has following shortcoming: 1. the voltage and current loop errer is bigger.2. voltage and current loop poor linearity.3. temperature drift is big.For this reason, people have carried out long-term exploration, have proposed various solutions, but all do not obtain comparatively desirable improvement.
Summary of the invention
The purpose of the utility model is to the problems referred to above, provides a kind of reasonable in design, simple in structure, can effectively reduce the temperature of entire circuit and float error, high precision circuit resistance tester easy for operation.
For achieving the above object; The utility model has adopted following technical proposal: this high precision circuit resistance tester; Comprise CPU, on CPU, be connected with voltage sample loop and current sampling circuit, it is characterized in that; Described have be connected with the voltage correction unit on the voltage sample loop, be connected with the current correction unit on the described current sampling circuit.
In above-mentioned high precision circuit resistance tester, described voltage correction unit links to each other with current sampling circuit with the voltage sample loop through first switching construction with the current correction unit; Described voltage correction unit links to each other with current sampling circuit with the voltage sample loop through second switching construction with the current correction unit.
In above-mentioned high precision circuit resistance tester, described voltage sample loop comprises voltage input end mouth, first amplifying circuit, an A/D change-over circuit, first isolation module of series connection successively, and described first isolation module links to each other with CPU; Described current sampling circuit comprises current input terminal mouth, second amplifying circuit, the 2nd A/D change-over circuit, second isolation module of series connection successively, and described second isolation module links to each other with CPU.
In above-mentioned high precision circuit resistance tester, the enlargement factor of described first amplifying circuit and second amplifying circuit is 20 times.
In above-mentioned high precision circuit resistance tester; Described first switching construction comprises first driver module that is connected on the CPU; Described first driver module links to each other with first switch, and described first switch is connected between voltage sample loop and the current sampling circuit; Second switching construction comprises second driver module that is connected on the CPU, and described second driver module links to each other with second switch, and described second switch is connected between voltage sample loop and the current sampling circuit.
In above-mentioned high precision circuit resistance tester, described first switch and second switch are double-point double-throw switch.
Compared with prior art, the advantage of this high precision circuit resistance tester is: reasonable in design, simple in structure, and can effectively reduce the temperature of entire circuit and float error, easy for operation.
Description of drawings
Fig. 1 is the structural representation that the utility model provides.
Among the figure, voltage sample loop 1, voltage input end mouth 11, first amplifying circuit 12, an A/D change-over circuit 13, first isolation module 14, current sampling circuit 2, current input terminal mouth 21, second amplifying circuit 22, the 2nd A/D change-over circuit 23, second isolation module 24, voltage correction unit 3, current correction unit 4, first driver module 6, first switch 7, second driver module 8, second switch 9.
Embodiment
As shown in Figure 1, this high precision circuit resistance tester comprises CPU, on CPU, is connected with voltage sample loop 1 and current sampling circuit 2, is connected with voltage correction unit 3 on the voltage sample loop 1, is connected with current correction unit 4 on the current sampling circuit 2.Voltage correction unit 3 links to each other with current sampling circuit 2 with voltage sample loop 1 through first switching construction with current correction unit 4; Voltage correction unit 3 links to each other with current sampling circuit 2 with voltage sample loop 1 through second switching construction with current correction unit 4.
First switching construction comprises that first driver module, 6, the first driver modules 6 that are connected on the CPU link to each other with first switch 7, and first switch 7 is connected between voltage sample loop 1 and the current sampling circuit 2.Second switching construction comprises that second driver module, 8, the second driver modules 8 that are connected on the CPU link to each other with second switch 9, and second switch 9 is connected between voltage sample loop 1 and the current sampling circuit 2.First switch 7 is double-point double-throw switch with second switch 9.
Specific embodiment described herein only is that the utility model spirit is illustrated.The utility model person of ordinary skill in the field can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from the spirit of the utility model or surmount the defined scope of appended claims.
Although this paper has used terms such as voltage sample loop 1, voltage input end mouth 11, first amplifying circuit 12, an A/D change-over circuit 13, first isolation module 14, current sampling circuit 2, current input terminal mouth 21, second amplifying circuit 22, the 2nd A/D change-over circuit 23, second isolation module 24, voltage correction unit 3, current correction unit 4, first driver module 6, first switch 7, second driver module 8, second switch 9 morely, do not get rid of the possibility of using other term.Using these terms only is in order to describe and explain the essence of the utility model more easily; It all is contrary with the utility model spirit being construed to any additional restriction to them.
Claims (6)
1. high precision circuit resistance tester; Comprise CPU; On CPU, be connected with voltage sample loop (1) and current sampling circuit (2); It is characterized in that, described have be connected with voltage correction unit (3) on the voltage sample loop (1), be connected with current correction unit (4) on the described current sampling circuit (2).
2. high precision circuit resistance tester according to claim 1 is characterized in that, described voltage correction unit (3) links to each other with current sampling circuit (2) with voltage sample loop (1) through first switching construction with current correction unit (4); Described voltage correction unit (3) links to each other with current sampling circuit (2) with voltage sample loop (1) through second switching construction with current correction unit (4).
3. high precision circuit resistance tester according to claim 1 and 2; It is characterized in that; Described voltage sample loop (1) comprises voltage input end mouth (11), first amplifying circuit (12), an A/D change-over circuit (13), first isolation module (14) of series connection successively, and described first isolation module (14) links to each other with CPU; Described current sampling circuit (2) comprises current input terminal mouth (21), second amplifying circuit (22), the 2nd A/D change-over circuit (23), second isolation module (24) of series connection successively, and described second isolation module (24) links to each other with CPU.
4. high precision circuit resistance tester according to claim 3 is characterized in that, the enlargement factor of described first amplifying circuit (12) and second amplifying circuit (22) is 20 times.
5. high precision circuit resistance tester according to claim 2; It is characterized in that; Described first switching construction comprises first driver module (6) that is connected on the CPU; Described first driver module (6) links to each other with first switch (7), and described first switch (7) is connected between voltage sample loop (1) and the current sampling circuit (2); Described second switching construction comprises second driver module (8) that is connected on the CPU, and described second driver module (8) links to each other with second switch (9), and described second switch (9) is connected between voltage sample loop (1) and the current sampling circuit (2).
6. high precision circuit resistance tester according to claim 5 is characterized in that, described first switch (7) and second switch (9) are double-point double-throw switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204335400U CN202351327U (en) | 2011-11-03 | 2011-11-03 | High precision circuit resistance tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204335400U CN202351327U (en) | 2011-11-03 | 2011-11-03 | High precision circuit resistance tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202351327U true CN202351327U (en) | 2012-07-25 |
Family
ID=46540323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204335400U Expired - Fee Related CN202351327U (en) | 2011-11-03 | 2011-11-03 | High precision circuit resistance tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202351327U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104880606A (en) * | 2015-05-19 | 2015-09-02 | 苏州市华安普电力工程有限公司 | Loop resistance tester |
| CN104977554A (en) * | 2014-04-10 | 2015-10-14 | 陈书欣 | Detection device for storage battery internal resistance tester |
-
2011
- 2011-11-03 CN CN2011204335400U patent/CN202351327U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104977554A (en) * | 2014-04-10 | 2015-10-14 | 陈书欣 | Detection device for storage battery internal resistance tester |
| CN104880606A (en) * | 2015-05-19 | 2015-09-02 | 苏州市华安普电力工程有限公司 | Loop resistance tester |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120725 Termination date: 20121103 |