CN201852886U - Multifunctional earth resistance tester - Google Patents
Multifunctional earth resistance tester Download PDFInfo
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- CN201852886U CN201852886U CN2010206154212U CN201020615421U CN201852886U CN 201852886 U CN201852886 U CN 201852886U CN 2010206154212 U CN2010206154212 U CN 2010206154212U CN 201020615421 U CN201020615421 U CN 201020615421U CN 201852886 U CN201852886 U CN 201852886U
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- chip microcomputer
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- resistance
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 6
- 238000001514 detection method Methods 0.000 claims description 3
- 230000035939 shock Effects 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 description 15
- 239000002689 soil Substances 0.000 description 3
- 210000000080 chela (arthropods) Anatomy 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000000875 corresponding Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 210000001503 Joints Anatomy 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000000789 fastener Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Abstract
The utility model belongs to the field of resistance testing devices and particularly relates to a multifunctional earth resistance tester. A method of laying an auxiliary earth pole to test earth resistance is adopted in the prior art, the auxiliary earth pole is required to be laid and an earth unit is required to be isolated from equipment. The technical scheme for overcoming the shortcoming of the prior art includes that the multifunctional earth resistance tester is characterized by comprising a single chip microcomputer, an A/D conversion module, a power module, a self-test module, a communication port and an input module, wherein the A/D conversion module is connected with a current clamp and a voltage clamp, signals of the current clamp and the voltage clamp are converted to be inputted to the single chip microcomputer and then outputted to the display module through single chip microcomputer, and the power module, the self-test module, the communication port and the input module are respectively connected with the single chip microcomputer. The multifunctional earth resistance tester is adaptable to earth resistance tests on various conditions, is simple in operation, convenient in use, large in range, wide in measuring span and fine in shock resistance.
Description
Technical field
The novel resistance test device field that belongs to of this use relates in particular to a kind of multifunctional grounded resistance meter.
Background technology
For the ground connection of testing various device and building thing is built the stake resistance of device, and measure soil resistivity and earthed system Leakage Current under the various conditions, generally use tradition to beat the method for auxiliary earth polar survey stake resistance.Can the achieve a butt joint test of earth resistance of the method, still, classic method need be beaten auxiliary earth polar, and grounding body and equipment must be isolated.Therefore said method has certain requirement and can't realize on-line measurement measuring condition.
The utility model content
In order to overcome defective of the prior art, but the novel purpose of this use provides a kind of multifunctional grounded resistance meter of playing auxiliary pile on-line measurement, having the intelligent test function of need not.
To achieve these goals, the novel technical scheme of taking of this use is:
A kind of multifunctional grounded resistance meter, its special character is: comprise single-chip microcomputer, A/D modular converter, power module, selftest module, PORT COM and load module, described A/D modular converter connects current clamp and voltage clamp, imports single-chip microcomputer after the conversion of signals with current clamp and voltage clamp detection, single-chip microcomputer is outputing to display module, described power module, selftest module, PORT COM is connected respectively at single-chip microcomputer with load module.
Last single-chip microcomputer connects the clock module control survey time.
The model of above-mentioned single-chip microcomputer is: 68H11
A kind of test implementation method of utilizing above-mentioned multifunctional grounded resistance meter may further comprise the steps:
1) beginning,
2) single-chip microcomputer initialization,
3) key scan,
4) two, three, the four-wire method grounding resistance measurement, if, operating measurement program then, if otherwise enter next step,
5) ac voltage measurement, if, operating measurement program then, if otherwise enter next step,
6) soil resistivity is measured, if operating measurement program then is if otherwise returned for the 4th step.
With respect to prior art, the novel advantage of this use is:
(1) adopts split-core type meter formula measuring method, need not to beat auxiliary pile, adapt to the needs of earth resistance under the various conditions.
(2) but on-line measurement need not grounding body and equipment are isolated.
(3) advanced technology has the intelligent test function.
(4) can under the condition that does not disconnect earthed system, test the Leakage Current real effective.
(5) have self-calibration function, avoid the resistance of contact resistance and line, the influence that test result is caused.
(6) little, the accuracy problem that solved small resistance measurement of precision height, error.
(7) measurement function conversion adopts electronic switch to switch to improve system reliability.
(8) carry out communication with upper PC, the realization measurement data is uploaded, and is convenient to preserve and prints.
(9) big, the wide-range of simple to operate, easy to use, scope, have backlight illuminating system.
(10) plastic cement sheath, shock resistance is good.
Description of drawings
Fig. 1 is the novel structural representation of this use,
Fig. 2 program flow diagram,
Fig. 3 is to use novel circuit connection diagram.
Embodiment
Further specify this use is novel below in conjunction with Figure of description and specific embodiment.
Referring to Fig. 1, a kind of multifunctional grounded resistance meter is characterized in that: comprise single-chip microcomputer, the A/D modular converter, power module, selftest module, PORT COM and load module, described A/D modular converter connects current clamp and voltage clamp, import single-chip microcomputer after the conversion of signals with current clamp and voltage clamp detection, single-chip microcomputer is outputing to display module, described power module, selftest module, PORT COM is connected respectively at single-chip microcomputer with load module.Described single-chip microcomputer connects the clock module control survey time, and the model of described single-chip microcomputer is: 68H11.
Referring to Fig. 2, utilize described multifunctional grounded resistance meter test implementation method, may further comprise the steps:
1) beginning,
2) single-chip microcomputer initialization,
3) key scan,
4) two, three, the four-wire method grounding resistance measurement, if, operating measurement program then, if otherwise enter next step,
5) ac voltage measurement, if, operating measurement program then, if otherwise enter next step,
6) soil resistivity is measured, if operating measurement program then is if otherwise returned for the 4th step.
Measure embodiment
1, standard four lead method of testing measurement of Grounding Resistance
Because what problem the contact resistance between test clip and tested electrode (the normally getting rusty) surface does not generally have, therefore four conductor wire connecting methods are better than three conductor wire connecting methods.
Tested electrode should be 5 times of the ground stud ground-electrode degree of depth to the distance between the current measurement probe H at least, or electroded 5 times of ground connection.
If measure total stake resistance of complicated earthed system, the distance that needs depends on maximum (diagonal line) distance (d) between each ground-electrode.
The first step: test lead is connected to instrument and tested object.
Second step: by the function shift key, be set in " four lines " position, corresponding pilot lamp is lighted.
The 3rd step: check test result by feeler switch,
The 4th step: preserve result displayed, so that carry out documentation later on.
2, use two test clamp measurement of Grounding Resistance
Use double fastener pincers test philosophy, can beat ground stud and measure.For example, in the area of building full house, may be difficult to maybe test probe can not be inserted ground and carry out the measurement of complicated earthed system.The advantage of this principle is to insert measuring sonde, also will not separate by tested electrode.
When measuring earthed system parameter (length of required ground-electrode and surface, the optimal fitting depth of earthed system etc.), stake resistance rate measurement, more accurate to guarantee calculating is carried out in suggestion.
Four test probes insert ground with the degree of depth of 5% " a " with the distance " a " that equates.
The stake resistance rate---ρ calculates according to following formula:
ρ＝2παR
Distance between two probes of α----
Stake resistance between middle two probes of R----
Stake resistance rate parameter can be used different units, that is:
Ω m(China and European countries adopt)
The Ω ft(U.S. adopts)
Here it is the earthing test instrument provides two units, and allow (m/ft) to use the reason place of two units according to the distance " a " between the test ground stud of selecting.
The 1st step: test lead is connected to instrument and test ground stud,
The 2nd step: by the function shift key, be set in " two pincers " position, and corresponding pilot lamp lights,
The 3rd step: check test result by feeler switch,
The 4th step: preserve result displayed, so that carry out documentation later on,
3, electric current (real effective) is measured
In the complicated earthed system that has many electrodes in parallel or other system of being connected with earthed system, a large amount of leakage currents may appear.
The waveform of measured current is non-sinusoidal wave normally.Various non-linear powers have caused the distortion of waveform.Here it is tester is measured the reason of electric current real effective, otherwise that the result understands is incorrect.Various faults in electric device or the earthed system may produce a large amount of leakage currents.Between calibrating terminal, forbid connecting any impressed voltage.
The first step: the test clamp is connected with the earthing test instrument, with the function shift key, is set in Current Position,
Second step: the sensing testing clamp is connected with measuring object,
The 3rd step: check test result by feeler switch,
The 4th step: preserve result displayed, so that carry out documentation later on.
Claims (3)
1. multifunctional grounded resistance meter, it is characterized in that: comprise single-chip microcomputer, A/D modular converter, power module, selftest module, PORT COM and load module, described A/D modular converter connects current clamp and voltage clamp, imports single-chip microcomputer after the conversion of signals with current clamp and voltage clamp detection, single-chip microcomputer is outputing to display module, described power module, selftest module, PORT COM is connected respectively at single-chip microcomputer with load module.
2. multifunctional grounded resistance meter according to claim 1 is characterized in that: described single-chip microcomputer connects the clock module control survey time.
3. according to claim 1 or 2 described multifunctional grounded resistance meters, it is characterized in that: the model of described single-chip microcomputer is: 68H11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206154212U CN201852886U (en) | 2010-11-19 | 2010-11-19 | Multifunctional earth resistance tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206154212U CN201852886U (en) | 2010-11-19 | 2010-11-19 | Multifunctional earth resistance tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201852886U true CN201852886U (en) | 2011-06-01 |
Family
ID=44095274
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206154212U Expired - Fee Related CN201852886U (en) | 2010-11-19 | 2010-11-19 | Multifunctional earth resistance tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201852886U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104914315A (en) * | 2015-06-01 | 2015-09-16 | 苏州市华安普电力工程有限公司 | Resistance tester |
| CN104931792A (en) * | 2015-06-23 | 2015-09-23 | 中山市木易万用仪器仪表有限公司 | Clamp-shaped insulation resistance test device |
| CN104977472A (en) * | 2015-06-23 | 2015-10-14 | 中山市木易万用仪器仪表有限公司 | Clip-on grounding resistor device |
| CN107831369A (en) * | 2017-12-19 | 2018-03-23 | 成都信息工程大学 | A kind of grounding resistance monitor instrument with self-test and correction |
-
2010
- 2010-11-19 CN CN2010206154212U patent/CN201852886U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104914315A (en) * | 2015-06-01 | 2015-09-16 | 苏州市华安普电力工程有限公司 | Resistance tester |
| CN104931792A (en) * | 2015-06-23 | 2015-09-23 | 中山市木易万用仪器仪表有限公司 | Clamp-shaped insulation resistance test device |
| CN104977472A (en) * | 2015-06-23 | 2015-10-14 | 中山市木易万用仪器仪表有限公司 | Clip-on grounding resistor device |
| CN107831369A (en) * | 2017-12-19 | 2018-03-23 | 成都信息工程大学 | A kind of grounding resistance monitor instrument with self-test and correction |
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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: 20110601 Termination date: 20111119 |