CN207036962U - A kind of earth resistance tester - Google Patents
A kind of earth resistance tester Download PDFInfo
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- CN207036962U CN207036962U CN201720996841.1U CN201720996841U CN207036962U CN 207036962 U CN207036962 U CN 207036962U CN 201720996841 U CN201720996841 U CN 201720996841U CN 207036962 U CN207036962 U CN 207036962U
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- earth
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- measured object
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Abstract
The utility model provides a kind of earth resistance tester,Including tester housing,The surface of the tester housing is provided with LCDs,Capstan switchs and function key,Case top is sequentially with earthing pole port,The extreme mouth of first auxiliary earth and the extreme mouth of the second auxiliary earth,Test lead is connected with each port,Enclosure interior is provided with dc source,DC/AC converters,AC amplifier and microcontroller,DC/AC converters change into dc source stable AC power,The test lead that AC power is passed through in earthing pole port is connected with the measured object being grounded,After test lead in the extreme mouth of second auxiliary earth is connected to ground and measured object composition loop,Caused exchange pressure drop on measured object is delivered to AC amplifier amplification by the test lead in the extreme mouth of the first auxiliary earth,Microcontroller is suitable to the alternating voltage after amplification handle the grounding resistance for calculating measured object and export to LCDs showing.This earth resistance tester is very convenient when in use.
Description
Technical field
It the utility model is related to electronic measuring technology field, and in particular to a kind of earth resistance tester.
Background technology
Many especially big electrical equipment of household electrical appliance are all three cores as the power line that refrigerator, washing machine, air-conditioning etc. use.It is real
As long as there are two can normal works of zero line and live wire using the electrical equipment of general civil power on border.This additional root line is exactly
Ground wire, that is to say, that these electrical equipment have to be grounded.
The introducing of grounding technology be initially in order to prevent protective measure that electrically or electronically etc. equipment is struck by lightning and taken,
Purpose is that thunder-strike current caused by thunder and lightning is incorporated into the earth by lightning rod, so as to play a part of protecting building.Meanwhile
Ground connection and a kind of effective means of protection personal safety, when phase line caused by certain reason, (such as wire insulation is bad, circuit is old
Change etc.) and device housings when touching, the shell of equipment will dangerous voltage generation, the electric current thus generated will be through protecting field
Line is to the earth, so as to play personal safety protective effect.
Grounding resistance is exactly that grounding resistance is electric current by connecing for weighing a whether good important parameter of ground state
Ground device flows into the earth again through greatly flowing to another grounding body or distally spreading run into resistance, the big corpusculum of grounding resistance
Existing electric device with the good degree that contacts and reflection grounded screen scale.In recent years due to the hair at full speed of computer technology
Exhibition, occur being exclusively used in the instrumentation grounding resistance meter for examining measurement of Grounding Resistance, earth resistance tester is to have abandoned biography
The artificial hand power working method of system, and the new digital testing tool of advanced large scale integrated circuit is used, substantially can be full
The various earthmeter requirements of foot.It is but of the present utility model inventor has found that existing earth resistance tester makes
With excessively complexity and measurement error is larger.
Utility model content
For the technology that the use of earth resistance tester existing for prior art is excessively complicated and larger measurement error
Problem, the utility model provide a kind of novel grounded resistance meter.
In order to solve the above-mentioned technical problem, the utility model employs following technical scheme：
A kind of earth resistance tester, including tester housing, the surface of the tester housing be provided with LCDs,
Capstan switchs and function key, be sequentially with the top of the tester housing earthing pole port, the extreme mouth of the first auxiliary earth and
The extreme mouth of second auxiliary earth, the earthing pole port, the extreme mouth of the first auxiliary earth and the extremely intraoral company of the second auxiliary earth
Test lead is connected to, the inside of the tester housing is provided with dc source, DC/AC converters, AC amplifier and microcontroller
Device, the DC/AC converters are suitable to the AC power that dc source is changed into output voltage and frequency stabilization, the alternating current
The test lead that source is passed through in earthing pole port is connected with the measured object being grounded, the test in the extreme mouth of the second auxiliary earth
Wire be connected to ground after with measured object composition loop, test lead and measured object in the extreme mouth of the first auxiliary earth and the
Ground connection in the extreme mouth of two auxiliary earths between test lead earth point, and caused exchange pressure drop on measured object will be included
AC amplifier amplification is delivered to, the microcontroller is suitable to the alternating voltage after amplification handle to calculate connecing for measured object
Ground resistance and exporting to LCDs show, the capstan switch and function key also with microcontroller electric connection.
Compared with prior art, earth resistance tester provided by the utility model when in use, first by earthing pole port
In test lead be connected with measured object, it is then that measured object and the extreme mouth of the first auxiliary earth and the second auxiliary earth is extreme
Intraoral test lead is embedded to the earth together, starts measurement function after then rotating measurement function corresponding to capstan switch selection
Key, rated alternating current is flowed between the test lead of measured object and the extreme mouth of the second auxiliary earth, thus on measured object
It will produce and exchange pressure drop, the test lead in the extreme mouth of the first auxiliary earth will include caused exchange pressure drop on measured object and send
Amplify to AC amplifier, the alternating voltage after amplification is carried out processing and calculates the grounding resistance of measured object and defeated by microcontroller
Go out to LCDs and show, in order to which tester observes.Therefore, this earth resistance tester is very convenient when in use,
And current potential descent method measurement of Grounding Resistance value is used, thus measurement error is smaller, measurement accuracy is high.
Further, the function key includes automatic shutdown key, backlight key, delete key, reading key, record key, measurement key, choosing
Select key, determination key, relative measurement key and data storage location selection key.
Further, the extreme mouth of first auxiliary earth and the test lead of the extremely intraoral connection of the second auxiliary earth is another
One end is connected with auxiliary earth rod.
Further, No. 5 battery packs of 1.5V that the dc source is connected using six sections.
Further, the microcontroller is single-chip microcomputer.
Further, the side of the tester housing is additionally provided with USB communication interfaces.
Brief description of the drawings
Fig. 1 is the positive structure diagram of earth resistance tester provided by the utility model.
Fig. 2 is the shell structure schematic diagram of earth resistance tester provided by the utility model.
Fig. 3 is the operation principle schematic diagram of earth resistance tester provided by the utility model.
Fig. 4 is the wiring schematic diagram of earth resistance tester provided by the utility model when in use.
In figure, 1, tester housing；10th, test lead；11st, auxiliary earth rod；2nd, LCDs；3rd, capstan switchs；
4th, function key；5th, dc source；6th, DC/AC converters；7th, AC amplifier；8th, microcontroller.
Embodiment
In order that technological means, creation characteristic, reached purpose and effect that the utility model is realized are easy to understand, under
Face combines and is specifically illustrating, and the utility model is expanded on further.
In description of the present utility model, it is to be understood that term " longitudinal direction ", " radial direction ", " length ", " width ", " thickness
The side of the instruction such as degree ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outer "
Position or position relationship are based on orientation shown in the drawings or position relationship, are for only for ease of description the utility model and simplification is retouched
State, rather than instruction or imply signified device or element there must be specific orientation, with specific azimuth configuration and operation,
Therefore it is not intended that to limitation of the present utility model.In description of the present utility model, unless otherwise indicated, " multiples' " contains
Justice is two or more.
, it is necessary to which explanation, unless otherwise clearly defined and limited, term " are pacified in description of the present utility model
Dress ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integratedly
Connection；Can be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected by intermediary,
It can be the connection of two element internals.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
Concrete meaning of the language in the utility model.
Refer to shown in Fig. 1 to Fig. 4, the utility model provides a kind of earth resistance tester, including tester housing 1,
The surface of the tester housing 1 is provided with LCDs 2, capstan switch 3 and function key 4, and the capstan switch 3 is used for over the ground
The selection of voltage, two pole method measurement resistance, three electrode method measurement resistance function, the function key 4 are used to perform various functions operation,
The top of the tester housing 1 is sequentially with the extreme mouth P of earthing pole port E, the first auxiliary earth and the second auxiliary earth pole
Test is connected with port C, the extreme mouth P of the earthing pole port E, the first auxiliary earth and the extreme mouth C of the second auxiliary earth to lead
Line 10, the inside of the tester housing 1 are provided with dc source 5, DC/AC converters 6, AC amplifier 7 and microcontroller 8,
The DC/AC converters 6 are suitable to the AC power that dc source 5 is changed into output voltage and frequency stabilization, the alternating current
The test lead 10 that source is passed through in the E of earthing pole port is connected with the measured object being grounded, in the extreme mouth C of the second auxiliary earth
After test lead 10 is connected to ground and measured object composition loop, i.e., described earthing pole port E and the extreme mouth C of the second auxiliary earth exist
Electrically conducted inside tester housing 1, specifically can pass through DC/ between the earthing pole port E and the extreme mouth C of the second auxiliary earth
AC converters are connected, the test lead 10 in the extreme mouth P of the first auxiliary earth and measured object and the second auxiliary earth
Ground connection in extreme mouth C between test lead earth point, and caused exchange pressure drop on measured object will be included and deliver to exchange
Amplifier 7 amplifies, i.e., the earth point of test lead 10 in the described extreme mouth P of first auxiliary earth is located at measured object and the second auxiliary
In the C of earthing pole port among the earth point of test lead 10, caused exchange pressure drop is stable alternating current stream on measured object
Pressure drop caused by measured object is crossed, the microcontroller 8 calculates measured object suitable for carrying out processing to the alternating voltage after amplification
Grounding resistance and exporting to LCDs 2 show；Specifically, the exchange of measured object grounding resistance=include measured object
Pressure drop ÷ the-the first auxiliary earths of rated alternating current pole grounding resistance, the rated alternating current are measured object and the second auxiliary
The exchange rated current flowed between the C of earthing pole port, the capstan switch 3 and function key 4 are also electrically connected with microcontroller 8
To realize its function control.
Compared with prior art, earth resistance tester provided by the utility model when in use, first by earthing pole port
In test lead be connected with measured object, it is then that measured object and the extreme mouth of the first auxiliary earth and the second auxiliary earth is extreme
Intraoral test lead is embedded to the earth together, starts measurement function after then rotating measurement function corresponding to capstan switch selection
Key, rated alternating current is flowed between the test lead of measured object and the extreme mouth of the second auxiliary earth, thus on measured object
It will produce and exchange pressure drop, the test lead in the extreme mouth of the first auxiliary earth will include caused exchange pressure drop on measured object and send
Amplify to AC amplifier, the alternating voltage after amplification is carried out processing and calculates the grounding resistance of measured object and defeated by microcontroller
Go out to LCDs and show, in order to which tester observes.Therefore, this earth resistance tester is very convenient when in use,
And current potential descent method measurement of Grounding Resistance value is used, thus measurement error is smaller, measurement accuracy is high.
As specific embodiment, the function key 4 include automatic shutdown key, backlight key, delete key, read key, record key,
Key, selection key, determination key, relative measurement key and data storage location selection key are measured, correspondingly, in the tester housing 1
Portion is provided with functional module corresponding with each function key, and each functional module receives the control of microcontroller 8.Wherein, institute
State automatic shutdown key to be used to be turned on and off automatic shut-off function, the backlight key is used to be turned on and off carrying for LCDs
For the backlight of backlight, the delete key is used for the removing of data, the reading read key and be used for measurement data, the record
Key is used for the storage of measurement data, and the measurement key is used to starting or terminating resistance measurement, and the selection key is used for maximum, most
The switching of small value and measurement of average value function, the determination key are used for data storage or confirmed when reading, the relative survey
The selection that key is used for relative measurement function is measured, the data storage location selection key is used for the choosing of the storage location of measurement data
Select.
As specific embodiment, it refer to shown in Fig. 4, the extreme mouth P of first auxiliary earth and the second auxiliary earth pole
The other end of the test lead of connection is connected with auxiliary earth rod 11 in the E of port, thus first auxiliary earth is extreme
When the test lead of connection is connected to ground in the mouth P and extreme mouth E of the second auxiliary earth, it can more easily pass through the auxiliary
Drop bar 11 is inserted into the soil of humidity, to accelerate measuring speed.
As specific embodiment, the dc source 5 is using six No. 5 battery packs of 1.5V for saving series connection, thus, it is possible to preferable
Ground meets the testing requirement of grounding resistance.
As specific embodiment, the microcontroller 8 is single-chip microcomputer, can specifically use 51 series monolithics, thus may be used
To realize that carrying out processing to caused exchange pressure drop on measured object calculates to obtain the grounding resistance of measured object, while can also be real
Now to the function control of capstan switch and various functions key；Certainly, the microcontroller 8 can also use arm processor etc. its
His controller.And the particular circuit configurations or specific chip model of the DC/AC converters 6 and AC amplifier 7, this area skill
Art personnel can be selected according to foregoing function, and this is for those skilled in the art or the personnel with basic circuit knowledge come
Say and be all easier to realize, will not be repeated here.
As specific embodiment, the side of the tester housing 1 is additionally provided with USB communication interfaces, the USB communication interfaces
Be electrically connected with microcontroller 8, specifically the USB communication interfaces can be arranged on the tester housing 1 left side or
Right edge, it is possible thereby to facilitate tester to carry out information communication with outer computer or notebook computer, to realize the friendship of data
Change.
Finally illustrate, above example is only unrestricted to illustrate the technical solution of the utility model, although ginseng
The utility model is described in detail according to preferred embodiment, it will be understood by those within the art that, can be to this
The technical scheme of utility model is modified or equivalent substitution, without departing from the objective and model of technical solutions of the utility model
Enclose, it all should cover among right of the present utility model.
Claims (6)
1. a kind of earth resistance tester, it is characterised in that including tester housing, the surface of the tester housing is provided with liquid
Crystal display screen, capstan switchs and function key, and earthing pole port, the first auxiliary earth are sequentially with the top of the tester housing
Extreme mouth and the extreme mouth of the second auxiliary earth, the earthing pole port, the extreme mouth of the first auxiliary earth and the second auxiliary earth pole
Test lead is connected with port, the inside of the tester housing is provided with dc source, DC/AC converters, AC amplifier
And microcontroller, the DC/AC converters are suitable to the AC power that dc source is changed into output voltage and frequency stabilization, institute
State AC power to be connected with the measured object being grounded by the test lead in earthing pole port, the extreme mouth of the second auxiliary earth
In test lead be connected to ground after with measured object form loop, test lead and quilt in the extreme mouth of the first auxiliary earth
The ground connection between test lead earth point in thing and the extreme mouth of the second auxiliary earth is surveyed, and will be included caused on measured object
Exchange pressure drop deliver to AC amplifier amplification, the microcontroller be suitable to the alternating voltage after amplification is carried out processing calculate by
Survey the grounding resistance of thing and export to LCDs and show, the capstan switch and function key also electrically connect with microcontroller
Connect.
2. earth resistance tester according to claim 1, it is characterised in that the function key include automatic shutdown key,
Backlight key, delete key, read key, record key, measurement key, selection key, determination key, relative measurement key and data storage location selection
Key.
3. earth resistance tester according to claim 1, it is characterised in that the extreme mouth of first auxiliary earth and
The other end of the test lead of the extremely intraoral connection of two auxiliary earths is connected with auxiliary earth rod.
4. earth resistance tester according to claim 1, it is characterised in that the dc source is using six section series connection
No. 5 battery packs of 1.5V.
5. earth resistance tester according to claim 1, it is characterised in that the microcontroller is single-chip microcomputer.
6. earth resistance tester according to claim 1, it is characterised in that the side of the tester housing is additionally provided with
USB communication interfaces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720996841.1U CN207036962U (en) | 2017-08-10 | 2017-08-10 | A kind of earth resistance tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720996841.1U CN207036962U (en) | 2017-08-10 | 2017-08-10 | A kind of earth resistance tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207036962U true CN207036962U (en) | 2018-02-23 |
Family
ID=61475254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720996841.1U Active CN207036962U (en) | 2017-08-10 | 2017-08-10 | A kind of earth resistance tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207036962U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109799393A (en) * | 2018-12-29 | 2019-05-24 | 王翰凌 | Earth resistance tester for home circuit |
-
2017
- 2017-08-10 CN CN201720996841.1U patent/CN207036962U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109799393A (en) * | 2018-12-29 | 2019-05-24 | 王翰凌 | Earth resistance tester for home circuit |
| CN109799393B (en) * | 2018-12-29 | 2024-03-12 | 王翰凌 | Ground resistance tester for household circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder |
Address after: B308, No. 36-4 Xiyong Avenue, Xiyong Street, Gaoxin District, Shapingba District, Chongqing, 400000 Patentee after: CHONGQING HUAXIU TECHNOLOGY CO.,LTD. Address before: No. 20-24, No. 4 Yuzhou Road, Jiulongpo District, Chongqing, 400000 Patentee before: CHONGQING HUAXIU TECHNOLOGY CO.,LTD. |
|
| CP02 | Change in the address of a patent holder |