CN201047857Y - Universal meter capable of automatically identifying different type extended modules - Google Patents
Universal meter capable of automatically identifying different type extended modules Download PDFInfo
- Publication number
- CN201047857Y CN201047857Y CNU2007201512407U CN200720151240U CN201047857Y CN 201047857 Y CN201047857 Y CN 201047857Y CN U2007201512407 U CNU2007201512407 U CN U2007201512407U CN 200720151240 U CN200720151240 U CN 200720151240U CN 201047857 Y CN201047857 Y CN 201047857Y
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- Prior art keywords
- expansion module
- module
- resistance
- expansion
- converter
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- Expired - Lifetime
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Abstract
The utility model relates to a multimeter which can automatically distinguish the different types of the expansion modules, the multimeter comprises a control processing module, a measuring module, a main panel resistor, an A / D converter, and an expansion module resistor. The expansion module resistor is arranged on the expansion module. The expansion module resistors with various resistance values correspond to the various types of the expansion modules. The power terminals of the control processing module, the expansion module resistance, and the main panel resistance are connected in series with the earth end, the series point A of the main panel resistor and the expansion module resistor is connected with the input terminal of the A / D converter, the A / D converter is connected with the control processing module. The control processing module reads and fetches the digital signals sent out by the A / D converter, and then the voltage value of the point A is gained. The type of the expansion module is different, so the resistance value of the expansion module resistor of the expansion module is different too, the voltage value of the point A is not the same as well, thereby being aware of the type of the expansion module. The multimeter of the utility model distinguishes the various type of the expansion module through the method, each expansion module does not need to adopt a microprocessor, thereby the cost is reduced.
Description
Technical field
The utility model relates to a kind of electrical measurement instrument, the particularly a kind of multimeter that can discern dissimilar expansion modules automatically.
Background technology
High-end multimeter can strengthen its function by external expansion module.Such as, multimeter inserts the data collecting card of multichannel, just the single channel measurement can be extended to multi-channel measurement.If multimeter has the expansion module of number of different types, when the user inserted different types of expansion module, multimeter just needed to distinguish these dissimilar expansion modules, to realize different functions.Existing multimeter is to discern dissimilar expansion modules by the microprocessor on the expansion module, and theory diagram as shown in Figure 1.A microprocessor is arranged in the expansion module, preserved dissimilar expansion module identification numbers in its microprocessor.When the user is inserted into this expansion module in the multimeter, the bus of the microprocessor of expansion module links to each other with the bus of the control treatment module of multimeter, can communicate, the control treatment module of multimeter is by the bus access microprocessor, thereby obtain this expansion module identification number, to discern dissimilar expansion modules.But each expansion module all needs to be equipped with a microprocessor, but also will programme at this microprocessor, so cost is higher.
The utility model content
The purpose of this utility model provides a kind of multimeter that can discern dissimilar expansion modules automatically, and each external expansion module of this multimeter does not need to be equipped with microprocessor, need not programme yet, thereby reduce cost.
The multimeter that can discern dissimilar expansion modules automatically of the present utility model comprises control treatment module, measurement module, mainboard resistance, A/D converter and expansion module resistance.Expansion module resistance is on expansion module.The expansion module resistance of different resistances is corresponding to different types of expansion module.The power end of control treatment module, expansion module resistance, mainboard resistance and ground end series connection, the series connection point A of mainboard resistance and expansion module resistance is connected with the input end of A/D converter, and A/D converter links to each other with control treatment module.Control treatment module reads the digital signal of A/D converter output, thereby obtains the magnitude of voltage that A is ordered.The type difference of expansion module, the resistance of its expansion module resistance are also different, and the magnitude of voltage that A is ordered is also different, learns the kind of expansion module thus.
Multimeter of the present utility model is discerned dissimilar expansion modules by the way, and each expansion module needn't adopt microprocessor, thereby has reduced cost.
Description of drawings
Fig. 1 is the schematic diagram of prior art;
Fig. 2 is the circuit diagram of embodiment of the present utility model.
Embodiment
Below in conjunction with description of drawings embodiment of the present utility model.
The multimeter that can discern dissimilar expansion modules automatically shown in Figure 2 comprises control treatment module, measurement module, display module, mainboard resistance, A/D converter and expansion module resistance.Expansion module resistance is on expansion module, and resistance is 2K ohm.Mainboard resistance is on the mainboard of multimeter, and resistance is 3K ohm.The series connection successively of the power end of control treatment module, expansion module resistance, mainboard resistance and ground, the series connection point A of mainboard resistance and expansion module resistance is connected with the input end of A/D converter, and A/D converter links to each other with control treatment module.The supply voltage of control treatment module is+5V.Control treatment module reads the digital signal of A/D converter output, thereby the magnitude of voltage that acquisition A is ordered is+3V.
Expansion module resistance and mainboard resistance can also be selected other resistances for use, are not limited to above-mentioned resistance.
Control treatment module is made of cpu chip and peripheral circuit thereof, and cpu chip can be dsp chip and 51 singlechip chips, is not limited to above chip.
Above embodiment only is used to illustrate the utility model, but not is used to limit the utility model.
Claims (2)
1. the multimeter that can discern dissimilar expansion modules automatically, comprise measurement module, control treatment module, it is characterized in that: also comprise a mainboard resistance, A/D converter and expansion module resistance, described expansion module resistance is on expansion module, power end, described mainboard resistance, described expansion module resistance and ground series connection, the series connection point A of described mainboard resistance and described expansion module resistance is connected with the input end of described A/D converter, and the output terminal of described A/D converter links to each other with described control treatment module.
2. the multimeter that can discern dissimilar expansion modules automatically according to claim 1, it is characterized in that: the resistance of described expansion module resistance is corresponding with the type of described expansion module, the resistance difference of the described expansion module resistance on the dissimilar expansion modules.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201512407U CN201047857Y (en) | 2007-06-08 | 2007-06-08 | Universal meter capable of automatically identifying different type extended modules |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201512407U CN201047857Y (en) | 2007-06-08 | 2007-06-08 | Universal meter capable of automatically identifying different type extended modules |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201047857Y true CN201047857Y (en) | 2008-04-16 |
Family
ID=39300445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201512407U Expired - Lifetime CN201047857Y (en) | 2007-06-08 | 2007-06-08 | Universal meter capable of automatically identifying different type extended modules |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201047857Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102279574A (en) * | 2011-05-25 | 2011-12-14 | 广州卓易电子科技有限公司 | Compatible equipment and method for master control board and slave control board |
| WO2015078351A1 (en) * | 2013-11-27 | 2015-06-04 | 华为终端有限公司 | Circuit for recognizing device category, circuit board, terminal device and signal controller |
-
2007
- 2007-06-08 CN CNU2007201512407U patent/CN201047857Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102279574A (en) * | 2011-05-25 | 2011-12-14 | 广州卓易电子科技有限公司 | Compatible equipment and method for master control board and slave control board |
| WO2015078351A1 (en) * | 2013-11-27 | 2015-06-04 | 华为终端有限公司 | Circuit for recognizing device category, circuit board, terminal device and signal controller |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: BEIJING RIGOL TECHNOLOGIES, INC. Free format text: FORMER OWNER: WANG YUE Effective date: 20110510 Free format text: FORMER OWNER: WANG TIEJUN LI WEISEN |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20110510 Address after: 102206 Beijing City, Shahe Town, step on the river village, No. 156 Patentee after: Beijing Rigol Technologies, Inc. Address before: 102206 Beijing City, Shahe Town, step on the river village, No. 156 Co-patentee before: Wang Tiejun Patentee before: Wang Yue Co-patentee before: Li Weisen |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20080416 |