CN209070093U - Earth-continuity tester calibrating installation - Google Patents
Earth-continuity tester calibrating installation Download PDFInfo
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- CN209070093U CN209070093U CN201821364478.2U CN201821364478U CN209070093U CN 209070093 U CN209070093 U CN 209070093U CN 201821364478 U CN201821364478 U CN 201821364478U CN 209070093 U CN209070093 U CN 209070093U
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Abstract
The utility model discloses earth-continuity tester calibrating installation, comprising: test panel is arranged in the front side of shell, the shell；Current sample interface, voltage sample interface, electric current input interface, resistance selection knob, alarming value are set on test panel and select knob；Power conversion module, resistance stepping module, resistance alarm module, controller, A/D conversion module is arranged in interior of shell；Electric current input interface is connect with the current output terminal of earth lead resistance meter to be tested, voltage sample interface is connect with the voltage sampling port of earth lead resistance meter to be tested, current sample interface is connect with multimeter, current sample interface and voltage sample interface are connect with A/D conversion module, and the output end of A/D conversion module connects controller；Resistance stepping module connects controller with the output end of resistance alarm module, and electric current input interface is connect with power conversion module.The utility model is easy to operate, easy to use.
Description
Technical field
The utility model relates to digital TV technologies, and in particular to earth-continuity tester calibrating installation.
Background technique
Earth-continuity tester is electrical equipment (such as household electrical appliance, electronic electricity for measuring AC network power supply
Hot utensil, medical electrical equipment and measurement, control and use for laboratory electrical equipment etc.) accessible metal shell draw with the equipment
The instrument of conducting resistance between safety ground end (line) out.
Earth-continuity tester is to be applied to the accessible metal of tested body by exporting AC or DC electric current
It between the safety ground end (line) that shell and the equipment are drawn, and measures electric current and flows through pressure drop caused by measured body, then lead to
The ratio between overvoltage and electric current obtain the Earth-continuity value of tested body.It is mainly by current source, voltage measurement, output electric current
The part such as setting or conciliation, sound-light alarm, instruction device forms.
It is higher as required precision of the detection instrument for its own, it generallys use measuring resistance and measures, but it is right
It needs to be calibrated by calibration instrument in measuring resistance, and existing calibration instrument normally result is complex, operating process
It is relatively complicated, it is not easy to operate.
Utility model content
The technical problem to be solved by the utility model is in view of the deficiency of the prior art, provide earth-continuity
Resistance meter calibrating installation.Audio/video flow is decoded using the multi-media processing unit of these equipment and is shown in terminal screen
On.
The utility model solves technical solution used by its technical problem:
Earth-continuity tester calibrating installation characterized by comprising shell, the front side of the shell, which is arranged, to be surveyed
Try panel；
Current sample interface, voltage sample interface, electric current input interface, resistance selection rotation are set on the test panel
Button, alarming value select knob；
The interior of shell setting power conversion module, resistance stepping module, resistance alarm module, controller, A/D turn
Change the mold block；
The electric current input interface is connect with the current output terminal of earth lead resistance meter to be tested, the voltage
Sampling Interface is connect with the voltage sampling port of earth lead resistance meter to be tested, the current sample interface and multimeter
Connection, the current sample interface and voltage sample interface are connect with A/D conversion module, the output end of the A/D conversion module
Connect controller；
The resistance stepping module connects controller, the electric current input interface and electricity with the output end of resistance alarm module
The connection of source conversion module, the resistance selection knob are connect with resistance stepping module, the alarming value selection knob and resistance report
Alert module connection, the output end connection display screen and warning device of the controller.
Further, the multimeter uses digital multimeter, and the digital multimeter uses voltage gear and current sample
Interface connection.
Further, the resistance stepping module using it is several customized as special material made of four-wire system resistor in series
Composition.
Further, the resistor uses metal film resistor.
Further, the resistance stepping module includes the first series resistance, the second series resistance and third series resistance,
First series resistance, resistance alarm module and the second series resistance first resistor stepping module in series, the third
Series resistance is second resistance stepping module.
Further, first series resistance is composed in series by first resistor, second resistance and 3rd resistor；Described
Two series resistances are composed in series by the 4th resistance and the 5th resistance；The third series resistance by the 6th resistance, the 7th resistance and
8th resistance is composed in series.
Further, the resistance alarm module is composed in series by a 4m Ω resistance and 11 1m Ω resistance.
It further, further include protective module, the protective module includes overcurrent protection module and misconnection protective module.
Compared with the prior art, the utility model has the following advantages:
1, the utility model does not need additional power supply in the case where normal work.Use ground connection to be tested
Conducting resistance tester exports electric current, and taking U=IR, (U is voltage, I is electric current, R is resistance, and when I is constant, changing R can change
Become U) it is supplied to calibrating installation.
2, the utility model electric current, voltage are all to be calibrated instrument output electric current to generate, and do not need to connect with external forceful electric power
Conversion, it is shockproof, without forceful electric power, do not have magnetic interference, to extraneous strong antijamming capability.
3, the utility model uses four-wire system resistor, can be applicable in wide temperature range, and accuracy is high.
4, the utility model may be implemented to be more than that rated current is protected, the protection of wrong line, once by setting protective module
Wiring, it is easy to operate, it is small in size, it is light-weight.
Detailed description of the invention
Fig. 1 is earth-continuity tester calibrating installation structure chart provided by the utility model；
Fig. 2 is earth-continuity tester calibrating installation usage state diagram provided by the utility model；
Fig. 3 is resistance stepping module provided by the utility model and resistance alarm module schematic diagram.
Specific embodiment
Specific embodiment of the present invention is described with reference to the accompanying drawings and embodiments:
Referring to Fig. 1 to Fig. 3, wherein Fig. 1 is earth-continuity tester calibrating installation structure provided by the utility model
Figure；Fig. 2 is earth-continuity tester calibrating installation usage state diagram provided by the utility model；Fig. 3 is the utility model
The resistance stepping module and resistance alarm module schematic diagram of offer.
As shown in Figure 1 to Figure 3, earth-continuity tester calibrating installation characterized by comprising shell 1, it is described
Test panel 2 is arranged in the front side of shell 1；
Current sample interface 3, voltage sample interface 4, electric current input interface 5, resistance selection are set on the test panel 2
Knob 6, alarming value select knob 7；
Power conversion module, resistance stepping module, resistance alarm module, controller, A/D are arranged inside the shell 1 to turn
Change the mold block；
The voltage sample interface is connect with the voltage sampling port of earth lead resistance meter to be tested, the electric current
Sampling Interface is connect with multimeter, and the current sample interface and voltage sample interface are connect with A/D conversion module, the A/D
The output end of conversion module connects controller；
Resistance stepping module connects controller with the output end of resistance alarm module, and the electric current input interface and power supply turn
Block connection is changed the mold, the resistance selection knob is connect with resistance stepping module, the alarming value selection knob and resistance alarm mould
Block connection, the output end connection display screen and warning device of the controller.
In the utility model embodiment, test panel, voltage sample interface and electric current input interface point are set on the shell
Do not connect with the voltage sampling port of earth-continuity tester to be tested and current output terminal, voltage sample interface obtain to
The voltage value of prover is connected in test resistance, exports electric current by current output terminal and supplies calibrating installation, is being calibrated by setting
The electric current of input is converted to the power supply of calibrating installation, the work electricity such as supply controller by the power conversion module inside device
Pressure, does not need that power supply in addition is arranged, structure is simple, easy to use；
Resistance selection knob is set on test panel and alarming value selects knob, it can be to survey by resistance selection knob
Examination resistance value is selected, and disease is by selecting the upper limit of alarming value to determine alarm threshold value；
Resistance stepping module, resistance alarm module, controller and A/D converter, resistance selection rotation are set inside the housing
Button controls resistance stepping module, and resistance value alarm knob controls resistance alarm module, and A/D converter receives electricity
Pressure Sampling Interface and the voltage and current information of current sample interface acquisition are simultaneously sent to controller, by controller to display screen and
Warning device is controlled.Controller can use STM32F103 processor.
In the utility model embodiment, the multimeter uses digital multimeter, and the digital multimeter uses voltage gear
It is connect with current sample interface.
The current output terminal for being calibrated earth-continuity tester connects the electricity of earth-continuity tester calibrating installation
Input terminal is flowed, the electricity of the voltage sample termination earth-continuity tester calibrating installation of earth-continuity tester is calibrated
Press sampling end.When be calibrated earth-continuity tester current output terminal simultaneously with earth-continuity tester calibration cartridge
Power conversion module connection in setting, exports the operating voltage for controller etc. by power conversion module, without
In addition power supply module is set.
Current input terminal on earth-continuity tester calibrating installation is connect with digital multimeter, passes through digital versatile
Table detects the electric current for being calibrated earth-continuity tester, specially uses digital multimeter voltage gear and calibration cartridge
The current sampling port connection set, according to I=U/R, wherein R is the resistance selection value of calibrating installation.
In the utility model embodiment, the resistance stepping module using it is several customized as special material made of four-wire system
Resistor in series composition.Preferably, resistor uses metal film resistor.
In the utility model embodiment, resistance stepping module is formed by multiple resistor in series, by revolving with resistance selection
The resistance value of button selection output, realizes earth-continuity tester to be tested convert resistance in the case where normal work
Value.
Specifically, the resistance stepping module includes the first series resistance, the second series resistance and third series resistance, institute
State the first series resistance, resistance alarm module and the second series resistance first resistor stepping module in series, the third string
Connection resistance is second resistance stepping module.
Resistance stepping module can be arranged according to earth-continuity tester to be tested, the utility model embodiment
In, first resistor stepping module and second resistance stepping module are set respectively to two electricity of 20-190m Ω and 300-500m Ω
Hinder range, resistance alarm module selects different resistance value to connect according to the setting of precision, resistance alarm module be setting for
The alarming value of the upper limit of the resistance value setting of earth-continuity tester to be tested.In the present embodiment, resistance alarm mould
Block is composed in series by a 4m Ω resistance and 11 1m Ω resistance.
Wherein, the first series resistance is by first resistor 20m Ω, second resistance 30m Ω and 3rd resistor 40m Ω series connection group
At；Second series resistance is composed in series by the 4th resistance 40m Ω and the 5th resistance 44m Ω；The third series resistance by
6th resistance 300m Ω, the 7th resistance 100m Ω and the 8th resistance 100m Ω are composed in series.
In the utility model embodiment, electric current indicating value is calibrated, directly connects calibrating installation electric current with digital multimeter voltage gear
Sampling end reads I=U/R (U digital versatile meter reading, R calibrating installation resistance selection value)
Calibrating resistance is shown, as electric current I=25A, " measurement range selection " of the resistance selection knob of calibrating installation is C1
(" resistance selection " is adjusted to 20m Ω, 50m Ω, 100m Ω, 150m Ω, 190m Ω respectively), reading are calibrated Earth-continuity survey
It tries instrument resistance indicating value R=U/I (I=25A is constant)；As electric current I=10A, calibrating installation " measurement range selection " is C2 (" resistance choosing
Select " it is adjusted to 300m Ω, 400m Ω, 500m Ω respectively), reading is calibrated earth-continuity tester resistance indicating value R=U/I
(I=25A is constant)
Calibrating resistance alarming value is calibrated earth-continuity tester alarming value and is set as 100m Ω, calibrating installation " amount
Journey selects " for C1 (" resistance selection " alarming value), it adjusts " alarming value selection " and makes to be calibrated earth-continuity tester and alarm
When read " alarming value selects " indicated value be alarming value.
In the utility model embodiment, calibrating installation further includes protective module 8, and the protective module 8 includes overcurrent protection
Module 81 and misconnection protective module 82.When electric current is more than rated current and wrong line, protective module, which plays, does not damage resistor
And switching switch, overcurrent protection module can use fuse, misconnection protective module can be using the side of setting unilateral diode
Formula, when reversed, unilateral diode is not turned on, and has the function that circuit protection.
The utility model does not need additional power supply in the case where normal work.It (is grounded using instrument is calibrated
Conducting resistance tester) output electric current take U=IR (U is voltage, I is electric current, R is resistance, when I is constant, change R can change
Become U) it is supplied to and is calibrated instrument (existing to need power supply, U is supplied to by voltage generator and is calibrated instrument).This is practical
New type of current, voltage be all be calibrated instrument output electric current generate (existing electric current, voltage are calibrated instrument electric current and electricity respectively
Press generator), to extraneous strong antijamming capability (existing requirement: shockproof, without forceful electric power, magnetic interference).The utility model is adopted
With entity resistor (four-wire system resistor made of special material customization), it is less than suitable for 10 DEG C~40 DEG C of temperature, humidity
90%RH can ensure accuracy (19 DEG C~21 DEG C of existing temperature, humidity are less than 80%RH and just can ensure that accuracy).This reality
It is existing volume 1/10, weight 1/5 with novel volume about (168 × 88 × 99) mm, weight about 2kg.So the utility model
With power supply is not necessarily to, interference rejection ability is strong, and accuracy is stablized, and is more than that rated current is protected, the protection of wrong line, primary connection,
Obvious advantage easy to operate, small in size, light-weight.
The preferred embodiment for the present invention is explained in detail above in conjunction with attached drawing, but the present invention is not limited to above-mentioned implementations
Mode within the knowledge of a person skilled in the art can also be without departing from the purpose of the present invention
It makes a variety of changes.
Many other changes and remodeling can be made by not departing from the spirit and scope of the present invention.It should be appreciated that the present invention is not
It is limited to specific embodiment, the scope of the present invention is defined by the following claims.
Claims (8)
1. earth-continuity tester calibrating installation characterized by comprising test is arranged in the front side of shell, the shell
Panel；
Current sample interface, voltage sample interface, electric current input interface, resistance selection knob, report are set on the test panel
Alert value selection knob；
Power conversion module, resistance stepping module, resistance alarm module, controller, A/D modulus of conversion is arranged in the interior of shell
Block；
The electric current input interface is connect with the current output terminal of earth lead resistance meter to be tested, the voltage sample
Interface is connect with the voltage sampling port of earth lead resistance meter to be tested, and the current sample interface and multimeter connect
It connects, the current sample interface and voltage sample interface are connect with A/D conversion module, and the output end of the A/D conversion module connects
Connect controller；
The resistance stepping module connects controller with the output end of resistance alarm module, and the electric current input interface and power supply turn
Block connection is changed the mold, the resistance selection knob is connect with resistance stepping module, the alarming value selection knob and resistance alarm mould
Block connection, the output end connection display screen and warning device of the controller.
2. earth-continuity tester calibrating installation according to claim 1, which is characterized in that the multimeter uses
Digital multimeter, the digital multimeter are connect using voltage gear with current sample interface.
3. earth-continuity tester calibrating installation according to claim 1, which is characterized in that the resistance stepping mould
Block is formed using several four-wire system resistor in series.
4. earth-continuity tester calibrating installation according to claim 3, which is characterized in that the resistor uses
Metal film resistor.
5. earth-continuity tester calibrating installation according to claim 3, which is characterized in that the resistance stepping mould
Block include the first series resistance, the second series resistance and third series resistance, first series resistance, resistance alarm module and
Second series resistance first resistor stepping module in series, the third series resistance are second resistance stepping module.
6. earth-continuity tester calibrating installation according to claim 5, which is characterized in that first series electrical
Resistance is composed in series by first resistor, second resistance and 3rd resistor；Second series resistance is by the 4th resistance and the 5th resistance
It is composed in series；The third series resistance is composed in series by the 6th resistance, the 7th resistance and the 8th resistance.
7. earth-continuity tester calibrating installation according to claim 4, which is characterized in that the resistance alarm mould
Block is composed in series by a 4m Ω resistance and 11 1m Ω resistance.
8. earth-continuity tester calibrating installation according to claim 1, which is characterized in that further include protection mould
Block, the protective module include overcurrent protection module and misconnection protective module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821364478.2U CN209070093U (en) | 2018-08-22 | 2018-08-22 | Earth-continuity tester calibrating installation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821364478.2U CN209070093U (en) | 2018-08-22 | 2018-08-22 | Earth-continuity tester calibrating installation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209070093U true CN209070093U (en) | 2019-07-05 |
Family
ID=67091018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821364478.2U Active CN209070093U (en) | 2018-08-22 | 2018-08-22 | Earth-continuity tester calibrating installation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209070093U (en) |
-
2018
- 2018-08-22 CN CN201821364478.2U patent/CN209070093U/en active Active
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