CN202649312U - Automatic resistor tester - Google Patents
Automatic resistor tester Download PDFInfo
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- CN202649312U CN202649312U CN 201220174398 CN201220174398U CN202649312U CN 202649312 U CN202649312 U CN 202649312U CN 201220174398 CN201220174398 CN 201220174398 CN 201220174398 U CN201220174398 U CN 201220174398U CN 202649312 U CN202649312 U CN 202649312U
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- resistance
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- control module
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Abstract
The utility model discloses an automatic resistor tester. The automatic resistor tester comprises: a power module for supplying power to equipment and providing a known constant current to a tested resistor to make the tested resistor output an analog voltage drop; a master control module for converting the analog voltage drop of the tested resistor into a corresponding digital voltage drop so as to calculate the resistance value of the tested resistor according to the known constant current and the digital voltage drop; a display module for receiving the resistance value data sent from the master control module and outputting and displaying the resistance value data; and a measuring range conversion module for receiving a measuring range conversion signal generated by the master control module according to the under-range signal or the over-range signal generated by an A/D module inside the master control module so as to adjust the resistor measuring range according to the measuring range conversion signal. The automatic resistor tester of the utility model has advantages of simple structure and low cost.
Description
Technical field
The utility model relates to a kind of resistance meter, relates in particular to a kind of automatic resistance tester.
Background technology
Resistance meter is electrical safety inspection and the indispensable instrument of earth work final acceptance of construction.Comprise earth resistance tester, Insulation Resistance Tester, direct current resistance measurer, surface resistance tester and circuit resistance tester etc.Yet existing resistance meter general structure is complicated, cost is higher.
The utility model content
The purpose of this utility model is to provide a kind of simple in structure, automatic resistance tester that cost is low.
For achieving the above object, the utility model provides a kind of automatic resistance tester, comprising:
Power module is used to power devices, and provides known constant current to make its output modeled pressure drop to measured resistance;
Main control module is used for digital pressure drop corresponding to the modeled pressure drop of measured resistance converting to, calculates the resistance of described measured resistance according to described known constant current and described digital pressure drop;
Display module is used for receiving resistance data and the output display that described main control module sends;
Quantum conversion module is used for receiving described main control module according to the range switching signal of owing range or the generation of overrange signal of the A/D module generation of its inside, adjusts the resistance measurement range of self according to described control signal.
In the automatic resistance tester of the present utility model, power module provides known constant current to make its output modeled pressure drop to measured resistance, main control module digital pressure drop corresponding to the modeled pressure drop of measured resistance converts to, calculate the resistance of measured resistance according to known constant current and digital pressure drop, and by display module with the resistance data output display that records, thereby a kind of resistance testing device simple in structure, lower-cost is provided.
Description of drawings
Fig. 1 is the circuit structure block diagram of automatic resistance tester of the present utility model;
Fig. 2 is the circuit theory diagrams of the main control module part of automatic resistance tester of the present utility model;
Fig. 3 is the circuit theory diagrams of the display module part of automatic resistance tester of the present utility model;
Fig. 4 is the power module of automatic resistance tester of the present utility model and the circuit theory diagrams of quantum conversion module part.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described in detail:
With reference to shown in Figure 1, the automatic resistance tester of the present embodiment comprises power module, main control module, display module and quantum conversion module.Wherein, power module is used to power devices, and provides known constant current to make its output modeled pressure drop to measured resistance; Main control module is used for digital pressure drop corresponding to the modeled pressure drop of measured resistance converting to, calculates the resistance of measured resistance according to known constant current and digital pressure drop; Display module is used for receiving resistance data and the output display that main control module sends; Quantum conversion module is used for receiving main control module according to the range switching signal of owing range or the generation of overrange signal of the A/D module generation of its inside, and adjusts the resistance measurement range of self according to the range switching signal.In addition, the automatic resistance tester of the present embodiment also has the automatic zero set (AZS) function, be specially: main control module carries out self check after the start, carry out resistance calculations if system works normally just reads the current output of its inner A/D module, when 5 that read continuously the A/D module export and carry out resistance calculations after, judge that whether 5 resistances that calculate are all less than 0.2 Ω, if all less than 0.2 Ω, then select wherein minimum value as initial value, otherwise prompting continues zeroing; After automatic zero set (AZS) was finished, the resistance that at every turn tests and calculates was later exported as the final test value after all will deducting this initial value, thereby has improved accuracy and the reliability of resistance measurement.
In conjunction with shown in Figure 2, in the automatic resistance tester of the present embodiment, the preferred model of main control module is single-chip microcomputer and the peripheral circuit thereof of C8051F020; The preferred model of display module is LCD12864, its 4th～the 15th pin and the 17th pin, and correspondence links to each other with the 87th pin, the 88th pin, the 86th pin, the 72nd～the 65th pin, the 85th pin and the 84th pin of single-chip microcomputer respectively; The preferred model of power module is the Voltage stabilizing module of LM1117; Quantum conversion module is the relay K 1 of four parallel connections, K2, K3 and K4, wherein, one end of relay K 1, the end of K2, the end of K3 and the end of K4 link to each other with the output terminal of Voltage stabilizing module, the other end of relay K 1, the other end of K2, the other end of K3 and the other end of K4 are corresponding to 100 Ω respectively, 1K Ω, the resistance of 10K Ω and 1M Ω and measured resistance form the loop, and the other end of relay K 1, the other end of K2, the other end of K3 and the other end of K4 are corresponding to 100 Ω respectively, 1K Ω, the resistance of 10K Ω and 1M Ω links to each other with the 54th pin of main control module, and the 54th pin of main control module gathers the modeled pressure drop of measured resistance.
Above embodiment is described preferred implementation of the present utility model; be not that scope of the present utility model is limited; under the prerequisite that does not break away from the utility model design spirit; various distortion and improvement that the common engineering technical personnel in this area make the technical solution of the utility model all should fall in the definite protection domain of claims of the present utility model.
Claims (4)
1. an automatic resistance tester is characterized in that, comprising:
Power module is used to power devices, and provides known constant current to make its output modeled pressure drop to measured resistance;
Main control module is used for digital pressure drop corresponding to the modeled pressure drop of measured resistance converting to, calculates the resistance of described measured resistance according to described known constant current and described digital pressure drop;
Display module is used for receiving resistance data and the output display that described main control module sends;
Quantum conversion module is used for receiving described main control module according to the range switching signal of owing range or the generation of overrange signal of the A/D module generation of its inside, adjusts the resistance measurement range of self according to described range switching signal.
2. automatic resistance tester according to claim 1 is characterized in that, described main control module comprises that model is single-chip microcomputer and the peripheral circuit thereof of C8051F020.
3. automatic resistance tester according to claim 2, it is characterized in that, described power module comprises that model is the Voltage stabilizing module of LM1117, described quantum conversion module comprises the relay K 1 of four parallel connections, relay K 2, relay K 3 and relay K 4, one end of described relay K 1, one end of relay K 2, one end of relay K 3 links to each other with the output terminal of described Voltage stabilizing module with an end of relay K 4, the other end of described relay K 1, the other end of relay K 2, the other end of the other end of relay K 3 and relay K 4 is corresponding to 100 Ω respectively, 1K Ω, the resistance of 10K Ω and 1M Ω and described measured resistance form the loop, and the other end of described relay K 1, the other end of relay K 2, the other end of the other end of relay K 3 and relay K 4 is corresponding to 100 Ω respectively, 1K Ω, the resistance of 10K Ω and 1M Ω links to each other with the 54th pin of described main control module, and the 54th pin of described main control module gathers the modeled pressure drop of described measured resistance.
4. automatic resistance tester according to claim 3, it is characterized in that, the model of described display module is LCD12864, its the 4th～the 15th pin and the 17th pin, correspondence links to each other with the 87th pin, the 88th pin, the 86th pin, the 72nd～the 65th pin, the 85th pin and the 84th pin of described single-chip microcomputer respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220174398 CN202649312U (en) | 2012-04-23 | 2012-04-23 | Automatic resistor tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220174398 CN202649312U (en) | 2012-04-23 | 2012-04-23 | Automatic resistor tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202649312U true CN202649312U (en) | 2013-01-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220174398 Expired - Fee Related CN202649312U (en) | 2012-04-23 | 2012-04-23 | Automatic resistor tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202649312U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106018963A (en) * | 2016-05-13 | 2016-10-12 | 国网天津市电力公司 | Portable insulation resistance test control system |
| CN108931690A (en) * | 2018-07-23 | 2018-12-04 | 秦国锋 | Embedded AC resistance measuring system based on ARM |
| CN110376492A (en) * | 2019-07-12 | 2019-10-25 | 中国铁路北京局集团有限公司北京车辆段 | A kind of insulation tester |
-
2012
- 2012-04-23 CN CN 201220174398 patent/CN202649312U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106018963A (en) * | 2016-05-13 | 2016-10-12 | 国网天津市电力公司 | Portable insulation resistance test control system |
| CN108931690A (en) * | 2018-07-23 | 2018-12-04 | 秦国锋 | Embedded AC resistance measuring system based on ARM |
| CN110376492A (en) * | 2019-07-12 | 2019-10-25 | 中国铁路北京局集团有限公司北京车辆段 | A kind of insulation 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: 20130102 Termination date: 20130423 |