CN202421268U - Overload indication and alarm circuit for digital multimeter - Google Patents
Overload indication and alarm circuit for digital multimeter Download PDFInfo
- Publication number
- CN202421268U CN202421268U CN2011204760941U CN201120476094U CN202421268U CN 202421268 U CN202421268 U CN 202421268U CN 2011204760941 U CN2011204760941 U CN 2011204760941U CN 201120476094 U CN201120476094 U CN 201120476094U CN 202421268 U CN202421268 U CN 202421268U
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- alarm
- indication
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Abstract
The utility model relates to an overload indication and alarm circuit for a digital multimeter. The overload indication and alarm circuit comprises a display screen, a display screen driving module connected with the display screen, an alarm module, an overload value selecting module and a singlechip which is connected with the display screen, the display screen driving module, the alarm module and the overload value selecting module, wherein the singlechip is used for acquiring a signal for contrasting the display screen driving module and the overload value selecting module and generating a control signal, so that the display screen and the alarm module are driven to perform acousto-optic alarm; an overload value selecting signal is set by the overload value selecting module and is analyzed and processed by the singlechip to acquire a custom overload value; and acquired measuring information of the display screen and the custom overload value are compared and judged to generate the control signal, and the control signal drives the display screen and the alarm module to perform background light indication and buzzing alarm by the singlechip. According to the overload indication and alarm circuit, the overload value can be set arbitrarily and meet the requirements of different users or safety; and the overload indication and alarm circuit is simple in line scheme, low in cost, reliable in performance and convenient to popularize.
Description
Technical field
The utility model relates to the auxiliary circuit of digital multimeter, indication of particularly a kind of digital multimeter overload and warning circuit.
Background technology
At present, the overload values of digital multimeter all is to pre-set in digital multimeter special chip inside, can't change setting again; Promptly can't set overload values arbitrarily, also can't indicate and alarm, can't satisfy the special applications demand of digital multimeter at measurement and control area to the overload values of any setting according to the application need of reality.
The utility model content
For addressing the above problem, the utility model is intended to propose indication of a kind of digital multimeter overload and warning circuit, and the overload values of digital multimeter can be set arbitrarily, to indicating and alarm this overload values.
For reaching above-mentioned purpose; The utility model provides indication of a kind of digital multimeter overload and warning circuit; Comprise that a display screen, connects the display screen driver module and an alarm module of display screen, is characterized in that: also comprise the single-chip microcomputer that an overload values selects module and to be connected respectively with display screen, display screen driver module, alarm module and overload values selection module; Described single-chip microcomputer is used to gather that contrast display screen driver module and overload values select to produce control signal driving display screen behind the signal of module and the alarm module is carried out sound and light alarm.
The described overload values of the utility model selects module to be made up of several buttons constituting perhaps of several pull-up resistors and pull down resistor, and the utility model preferentially adopts the overload values that constitutes of several pull-up resistors and pull down resistor to select module.
After adopting technique scheme,, obtain digital multimeter through scm software analysis, processing through read the drive signal of digital multimeter display screen driver module through the I/O mouth of single-chip microcomputer
Metrical information that display screen shows, read the overload values selection signal that overload values is selected module through the I/O mouth of single-chip microcomputer, obtain through scm software analysis, processing
Self-defined overload valuesMetrical information that display screen showed and the self-defined overload values then single-chip microcomputer obtained compare, judge; Through the I/O of single-chip microcomputer mouth output control signal corresponding, this control signal is carried out bias light indication and buzzing alarm through digital multimeter display screen and alarm module.
The beneficial effect of the utility model is: select module to produce high-low level through overload values and set overload values selection signal; Obtain a self-defining overload values through the single-chip microcomputer analyzing and processing; Metrical information that display screen showed and self-defined overload values that single-chip microcomputer is obtained compare, judge the generation control signal; This control signal is handled through single-chip microcomputer after display screen and alarm module are carried out bias light indication and buzzing alarm; The utility model adopts same circuit just can realize the setting of any overload values, can meet the needs of different users or different safety requirement, and the circuit scheme is simple, with low cost, dependable performance, be convenient to popularization.
Description of drawings
Fig. 1 is the circuit structure block scheme of the utility model.
Fig. 2 is the circuit diagram of the utility model.
1. display screen; 2. display screen driver module; 3. alarm module; 4. single-chip microcomputer; 5. overload values is selected module.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is further specified.
As
Fig. 1With
Fig. 2Shown indication of a kind of digital multimeter overload and warning circuit; Comprise that a display screen 1, connects the display screen driver module 2 and an alarm module 3 of display screen 1; Also comprise a single-chip microcomputer 4; Described single-chip microcomputer 4 display screen 1, display screen driver module 2, alarm module 3 respectively connects, and also is connected with one on the single-chip microcomputer 4 by five pull-up resistors and five overload values selection modules 5 that pull down resistor connects to form; The principle of work of the utility model is: the drive signal that reads digital multimeter display screen driver module 2 through the I/O mouth through single-chip microcomputer 4; Obtain metrical information that digital multimeter display screen 1 shows through single-chip microcomputer 4 software analysis, processing; I/O mouth through single-chip microcomputer 4 reads the overload values selection signal that overload values is selected module 5; Be obtained from the definition overload values through single-chip microcomputer 4 software analysis, processing; Metrical information that the display screen 1 that then single-chip microcomputer 4 is obtained is shown and the single-chip microcomputer 4 inner self-defined overload values that obtain compare, judge; Through the I/O of single-chip microcomputer 4 mouth output control signal corresponding, this control signal is correspondingly carried out bias light indication and buzzing alarm through digital multimeter display screen 1 and alarm module 3.
The foregoing description only supplies to explain the usefulness of the utility model; Those skilled in the art; Under the situation of spirit that does not break away from the utility model and scope; Can also make various conversion or variation, therefore, all technical schemes that are equal to also belong to the protection domain that claim limited of the utility model.
Claims (2)
1. digital multimeter overload indication and warning circuit comprise that a display screen, connects the display screen driver module and an alarm module of display screen, is characterized in that: also comprise one
Overload values is selected moduleAnd one select module to be connected respectively with display screen, display screen driver module, alarm module and overload values
Single-chip microcomputerDescribed
Single-chip microcomputerBe used for
Produce control signal after gathering the signal that contrasts display screen driver module and overload values selection moduleDrive display screen and alarm module and carry out sound and light alarm.
2. a kind of digital multimeter overload as claimed in claim 1 indication and warning circuit is characterized in that: described overload values selects module to be made up of several buttons constituting perhaps of several pull-up resistors and pull down resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204760941U CN202421268U (en) | 2011-11-25 | 2011-11-25 | Overload indication and alarm circuit for digital multimeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204760941U CN202421268U (en) | 2011-11-25 | 2011-11-25 | Overload indication and alarm circuit for digital multimeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202421268U true CN202421268U (en) | 2012-09-05 |
Family
ID=46746021
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204760941U Expired - Fee Related CN202421268U (en) | 2011-11-25 | 2011-11-25 | Overload indication and alarm circuit for digital multimeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202421268U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104515902A (en) * | 2013-09-29 | 2015-04-15 | 承永资讯科技股份有限公司 | Universal meter with high-voltage warning function |
| CN108828285A (en) * | 2018-08-22 | 2018-11-16 | 深圳市迈斯泰克电子有限公司 | Automatic alarm device and multimeter |
-
2011
- 2011-11-25 CN CN2011204760941U patent/CN202421268U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104515902A (en) * | 2013-09-29 | 2015-04-15 | 承永资讯科技股份有限公司 | Universal meter with high-voltage warning function |
| CN108828285A (en) * | 2018-08-22 | 2018-11-16 | 深圳市迈斯泰克电子有限公司 | Automatic alarm device and multimeter |
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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: 20120905 Termination date: 20131125 |