CN207528796U - A kind of multimeter - Google Patents
A kind of multimeter Download PDFInfo
- Publication number
- CN207528796U CN207528796U CN201721451212.7U CN201721451212U CN207528796U CN 207528796 U CN207528796 U CN 207528796U CN 201721451212 U CN201721451212 U CN 201721451212U CN 207528796 U CN207528796 U CN 207528796U
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- unit
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- power supply
- sampling
- circuit
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Abstract
The utility model provides a kind of multimeter, the table body including protective case and in protective case, and display unit, the first connector and the second connector are additionally provided with table；First connector and the second connector are respectively used to connection test pencil connecting line, the data that display unit detects for display；The first power supply unit and the first sampling unit being connected in turn between the first connector and the second connector are further included, the circuit that the first power supply unit is used to be externally formed with for the first connector and the second connector provides voltage, and the first sampling unit is used for the electric current of measure loop；Further include the second power supply unit being connected in turn between the first connector and the second connector, switch unit and the second sampling unit, second power supply unit is used to provide voltage for circuit, second sampling unit is used for the electric current of measure loop, and switch unit is controlled the circuit where the second power supply unit of cut-out and the second sampling unit by a control unit.
Description
Technical field
The utility model is related to detect field of instrumentation technology, more particularly to a kind of multimeter.
Background technology
Multimeter is also known as multi-meter, multimeter, avometer, numerous table etc., is that the departments such as power electronics are indispensable
Measuring instrumentss, generally to measure voltage, electric current and resistance as the main purpose.Multimeter by display mode be divided into pointer multimeter and
Digital multimeter.
By taking the resistance of multimeter detection determinand as an example, basic principle is to provide electricity using the power supply inside multimeter
Pressure, is formed into a loop by determinand.If the resistance value of determinand is very big, it may appear that so a kind of situation, loop current are almost
Zero.In fact, such case and multimeter are similar without the situation being formed into a loop.That is, what if multimeter detected
Determinand is in open-circuit condition, then loop current is also almost nil.Therefore, for so a kind of situation, existing ten thousand
It is indistinguishable with table.
Utility model content
To solve the technical issues of above-mentioned, the utility model proposes a kind of multimeters, can distinguish the resistance value of determinand
Excessive and determinand is in open-circuit condition.
To achieve the above object, the utility model provides following technical solution：
A kind of multimeter, the table body including protective case and in the protective case, it is single that the table is additionally provided with display with it
Member, the first connector and the second connector；First connector and second connector are respectively used to connection test pencil connecting line, institute
State display unit for show detect data；It further includes and is connected in turn between first connector and second connector
First power supply unit and the first sampling unit, first power supply unit are used to exist for first connector and second connector
The circuit that outside is formed provides voltage, and first sampling unit is used to detect the electric current in the circuit；
It is single to further include the second power supply unit being connected in turn between first connector and second connector, switch
Member and the second sampling unit, second power supply unit are used to provide voltage for the circuit, and second sampling unit is used
In the electric current for detecting the circuit, the switch unit is cut off second power supply unit and described the by control unit control
Circuit where two sampling units；
Wherein, described control unit is also respectively connected with first sampling unit, second sampling unit and described
Display unit.
As a kind of embodiment, first power supply unit and second power supply unit are same accumulator, institute
It states accumulator to be powered for the circuit where first power supply unit and first sampling unit, the accumulator is also
Circuit where second power supply unit and second sampling unit is powered.
As a kind of embodiment, the switch unit is triode.
As a kind of embodiment, first sampling unit and second sampling unit are respectively sampling electricity
Resistance.
As a kind of embodiment, described control unit is microcontroller.
As a kind of embodiment, the display unit is digital display screen, and the digital display screen is set on institute
Table body is stated, and relative to the concave surface of the table body.
As a kind of embodiment, the upper and lower end of the protective case relative to the table body evagination, and
Form protection zone；The middle part of the protective case forms grip zone relative to the table body indent.
The beneficial effects of the utility model compared with the prior art lie in：
The utility model provides a kind of multimeter, and excessive be in determinand of resistance value that can distinguish determinand is opened a way
State.Wherein, conventional detection is carried out by the first connector, the second connector and the first power supply unit, the first sampling unit, also
Detection is compared by the first connector, the second connector and the second power supply unit, switch unit, the second sampling unit, is simulated
The state of open circuit.Therefore it may determine that the resistance value for distinguishing determinand is excessive and determinand is in open-circuit condition by comparing.
Description of the drawings
Fig. 1 is the stereogram of multimeter that the utility model embodiment provides；
Fig. 2 is the block diagram of multimeter that the utility model embodiment provides.
In figure：1st, protective case；2nd, table body；21st, upper end；22nd, lower end；23rd, middle part；100th, display unit；200th,
One connector；300th, the second connector；400th, the first power supply unit；500th, the first sampling unit；600th, the second power supply unit；700th, it opens
Close unit；800th, the second sampling unit；900th, control unit.
Specific embodiment
Below in conjunction with attached drawing, to the utility model, above-mentioned and other technical characteristic and advantage carry out clearly and completely
Description, it is clear that described embodiment is only the section Example rather than whole embodiments of the utility model.
With reference to Fig. 2, a kind of multimeter is present embodiments provided, the table body 2 including protective case 1 and in protective case 1, table
Display unit 100, the first connector 200 and the second connector 300 are additionally provided on body 2；First connector 200 and the second connector 300 divide
Test pencil connecting line, the data that display unit 100 detects for display Yong Yu not connected；It further includes and is connected to the first connector in turn
200 and the second the first power supply unit 400 and the first sampling unit 500 between connector 300, the first power supply unit 400 is for being
The circuit that first connector 200 and the second connector 300 are externally formed with provides voltage, and the first sampling unit 500 is used for measure loop
Electric current；Further include the second power supply unit 600, the switch unit being connected in turn between the first connector 200 and the second connector 300
700 and second sampling unit 800, the second power supply unit 600 be used to provide voltage for circuit, the second sampling unit 800 is used for
The electric current of measure loop, switch unit 700 are single by a control unit 900 control cut-out the second power supply unit 600 and the second sampling
Circuit where member 800；Wherein, control unit 900 be also respectively connected with the first sampling unit 500, the second sampling unit 800, with
And the display unit 100.
By taking above-mentioned technical solution, can distinguish determinand resistance value is excessive and determinand is in open circuit shape
State.Wherein, it is carried out often by the first connector 200, the second connector 300 and the first power supply unit 400, the first sampling unit 500
Rule detection, the first sampling unit 500 here can feed back testing result；Also by the first connector 200, the second connector 300, with
And detection is compared in second power supply unit 600, switch unit 700, the second sampling unit 800, simulates the state of open circuit, here
Second detection unit can feed back testing result.Therefore it may determine that the resistance value for distinguishing determinand is excessive and treats by comparing
It surveys object and is in open-circuit condition.The process wherein compared realizes that the result of comparison passes through display unit 100 by control unit 900
Display.Under normal circumstances, if the data of the two are inconsistent, illustrate that the resistance value of determinand is excessive；If the on the contrary, number of the two
According to consistent, illustrate that determinand is in open-circuit condition.
In other examples, in order to realize above-mentioned technical solution, following setting may be used.
First power supply unit 400 and the second power supply unit 600 are same accumulator, and accumulator is the first power supply unit 400
It is powered with the circuit where the first sampling unit 500, accumulator is also the second power supply unit 600 and the second sampling unit
Circuit where 800 is powered.Switch unit 700 is triode.First sampling unit 500 and the second sampling unit 800 divide
It Wei not a sampling resistor.Control unit 900 is microcontroller.
With reference to Fig. 1, in a preferred embodiment, display unit 100 is digital display screen, and digital display screen is set on table
Body 2, and relative to the concave surface of table body 2.By taking above-mentioned technical solution, p display units 100 can be protected
Shield, reduces the situation that it is scraped.In addition, the upper end 21 and lower end 22 of protective case 1 be relative to 2 evagination of table body, and formed
Protection zone；The middle part 23 of protective case 1 forms grip zone relative to 2 indent of table body.By taking above-mentioned technical solution,
Protection zone is formed in end, grip zone is formed at middle part 23, it is main still based on the considerations of actual use.Because in use, end
Portion is arranged to protection zone with little need for gripping, and grip zone correspondingly is arranged on middle part 23.
Particular embodiments described above has carried out into one the purpose of this utility model, technical solution and advantageous effect
The detailed description of step, it should be understood that the foregoing is merely specific embodiment of the utility model, are not used to limit this reality
With novel protection domain.Particularly point out, to those skilled in the art, it is all the spirit and principles of the utility model it
Any modification, equivalent substitution, improvement and etc. that are interior, being done, should be included within the scope of protection of this utility model.
Claims (7)
1. a kind of multimeter, the table body (2) including protective case (1) and in the protective case (1), on the table body (2) also
Equipped with display unit (100), the first connector (200) and the second connector (300)；First connector (200) and described second
Connector (300) is respectively used to connection test pencil connecting line, the data that the display unit (100) is detected for display；Its feature exists
In further including the first power supply unit being connected in turn between first connector (200) and second connector (300)
(400) and the first sampling unit (500), first power supply unit (400) is for for first connector (200) and described
Circuit that two connectors (300) are externally formed with provides voltage, and first sampling unit (500) is for detecting the electricity in the circuit
Stream；
Further include the second power supply unit being connected in turn between first connector (200) and second connector (300)
(600), switch unit (700) and the second sampling unit (800), second power supply unit (600) is for for the circuit
Voltage is provided, second sampling unit (800) is for detecting the electric current in the circuit, and the switch unit (700) is by a control
The circuit where second power supply unit (600) and second sampling unit (800) is cut off in unit (900) control processed；
Wherein, described control unit (900) is also respectively connected with first sampling unit (500), second sampling unit
(800) and the display unit (100).
2. multimeter according to claim 1, which is characterized in that first power supply unit (400) and described second supplies
Electric unit (600) is same accumulator, and the accumulator is first power supply unit (400) and first sampling unit
(500) circuit where is powered, and the accumulator is also second power supply unit (600) and second sampling unit
(800) circuit where is powered.
3. multimeter according to claim 1, which is characterized in that the switch unit (700) is triode.
4. multimeter according to claim 1, which is characterized in that first sampling unit (500) and described second is adopted
Sample unit (800) is respectively a sampling resistor.
5. multimeter according to claim 1, which is characterized in that described control unit (900) is microcontroller.
6. multimeter according to claim 1, which is characterized in that the display unit (100) is digital display screen, and
The digital display screen is set on the table body (2), and relative to the concave surface of the table body (2).
7. multimeter according to claim 1, which is characterized in that the upper end (21) and lower end of the protective case (1)
(22) relative to table body (2) evagination, and protection zone is formed；The middle part (23) of the protective case (1) is relative to the table
Body (2) indent, and form grip zone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721451212.7U CN207528796U (en) | 2017-11-03 | 2017-11-03 | A kind of multimeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721451212.7U CN207528796U (en) | 2017-11-03 | 2017-11-03 | A kind of multimeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207528796U true CN207528796U (en) | 2018-06-22 |
Family
ID=62572191
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721451212.7U Expired - Fee Related CN207528796U (en) | 2017-11-03 | 2017-11-03 | A kind of multimeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207528796U (en) |
-
2017
- 2017-11-03 CN CN201721451212.7U patent/CN207528796U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180622 Termination date: 20181103 |