CN104614570B - A kind of method and device for measuring electric current - Google Patents
A kind of method and device for measuring electric current Download PDFInfo
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- CN104614570B CN104614570B CN201510034026.2A CN201510034026A CN104614570B CN 104614570 B CN104614570 B CN 104614570B CN 201510034026 A CN201510034026 A CN 201510034026A CN 104614570 B CN104614570 B CN 104614570B
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Abstract
The embodiment of the invention discloses a kind of method and device for measuring electric current, the embodiment of the present invention is by obtaining the superposition magnetic field after magnetic field is superimposed with earth's magnetic field caused by electrical conductor and described being superimposed offset direction angle caused by magnetic field；Determine component of the superposition magnetic field on the specified axle of reference frame；According to component of the earth's magnetic field on the specified axle of the reference frame and the component for being superimposed magnetic field on the specified axle of the reference frame, the sense of current in the electrical conductor is determined；According to the sense of current and the offset direction angle, by inquiring about the corresponding table prestored, it is determined that current value corresponding with the offset direction angle.The embodiment of the present invention is realized using the electric current in the terminal measurement electrical conductor with earth inductor, and method of testing is simple, and the hardware cost for not increasing terminal can complete the measurement of electric current.
Description
Technical field
The present invention relates to communication technical field, more particularly to a kind of method and device for measuring electric current.
Background technology
The equipment of currently used measurement electric current has：(1) ammeter, directly string measure in primary circuit, can fit
For in DC circuit and low current alternating current circuit；Or summation current transformer is used cooperatively, current transformer is serially connected in one
Minor loop, primary current is induced by certain no-load voltage ratio, is applicable to high current ac circuit and high tension loop；(2) general-purpose
Table, test electric current is cumbersome, and not only circuit is disconnected indicator string in the loop, and the range of universal meter is limited, can
Suitable for DC loop and low current ac circuit；(3) current probe, it is very accurate that this kind of mode measures electric current, but popping one's head in needs
Power supply is wanted to power, and current value needs oscilloscope display to come out.
It can be seen that measurement electric current is typically required for special instrument to measure at present, it is directed to as current probe
It is not only expensive, it is necessary to corollary equipment for testing current equipment, and corresponding oscillograph is also utilized by the electricity of test
Flow valuve shows reading or analysis, therefore considerably increases the cost and difficulty of measurement electric current.
The content of the invention
The present invention provides a kind of method and device for measuring electric current, to simple on the basis of terminal hardware cost is not increased
Singly it is readily achieved the measurement of electric current.
A kind of method for measuring electric current provided in an embodiment of the present invention, including：
Magnetic field caused by obtaining electrical conductor be superimposed with earth's magnetic field after superposition magnetic field and it is described be superimposed it is inclined caused by magnetic field
From deflection；
Determine component of the superposition magnetic field on the specified axle of reference frame；
According to component of the earth's magnetic field on the specified axle of the reference frame with the magnetic field that is superimposed in the ginseng
The component on the specified axle of coordinate system is examined, determines the sense of current in the electrical conductor；
According to the sense of current, the offset direction angle and angle-electric current corresponding table, it is determined that with the offset direction
Current value corresponding to angle.
A kind of terminal provided in an embodiment of the present invention, including：
Sensor, for obtaining the superposition magnetic field after magnetic field is superimposed with earth's magnetic field caused by electrical conductor and the superposition magnetic
Offset direction angle caused by；Determine component of the superposition magnetic field on the specified axle of reference frame；
Processor, for being superimposed magnetic with described according to component of the earth's magnetic field on the specified axle of the reference frame
Component of the field on the specified axle of the reference frame, determines the sense of current in the electrical conductor；According to the electricity
Direction, the offset direction angle and angle-electric current corresponding table are flowed, it is determined that current value corresponding with the offset direction angle；
Memory, for storing the angle-electric current corresponding table.
The embodiment of the present invention is by obtaining the superposition magnetic field after magnetic field is superimposed with earth's magnetic field caused by electrical conductor and described
It is superimposed offset direction angle caused by magnetic field；Determine component of the superposition magnetic field on the specified axle of reference frame；According to institute
State component of the earth's magnetic field on the specified axle of the reference frame and be superimposed magnetic field specifying in the reference frame with described
Component on axle, determine the sense of current in the electrical conductor；According to the sense of current and the offset direction angle, lead to
The corresponding table that inquiry prestores is crossed, it is determined that current value corresponding with the offset direction angle.The embodiment of the present invention realizes profit
With the electric current in the terminal measurement electrical conductor with earth inductor, method of testing is simple, and does not increase the hardware of terminal
Cost can complete the measurement of electric current.
Brief description of the drawings
Fig. 1 is a kind of method for measuring electric current provided in an embodiment of the present invention；
Fig. 2 is the reference frame schematic diagram of the embodiment of the present invention；
Fig. 3 is a kind of terminal schematic diagram provided in an embodiment of the present invention.
Embodiment
In order that the object, technical solutions and advantages of the present invention are clearer, the present invention is made below in conjunction with accompanying drawing into
One step it is described in detail, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole implementation
Example.Based on the embodiment in the present invention, what those of ordinary skill in the art were obtained under the premise of creative work is not made
All other embodiment, belongs to the scope of protection of the invention.
Fig. 1 is the schematic flow sheet corresponding to a kind of method for measuring electric current provided in an embodiment of the present invention, including as follows
Step 101 is to step 103；
Step 101, superposition magnetic field and the superposition magnetic field after magnetic field caused by acquisition electrical conductor is superimposed with earth's magnetic field
Caused offset direction angle；Determine component of the superposition magnetic field on the specified axle of reference frame；
Step 102, magnetic field is superimposed with described according to component of the earth's magnetic field on the specified axle of the reference frame
Component on the specified axle of the reference frame, determine the sense of current and offset direction in the electrical conductor
Angle；
Step 103, according to the sense of current and the offset direction angle, electricity corresponding with the offset direction angle is obtained
Flow valuve.
The method of the electric current of measurement electrical conductor described in the embodiment of the present invention can make in the terminal with sensor
With, such as mobile phone, flat board；The sensor includes earth inductor and acceleration induction device.
At no externally-applied magnetic field (such as magnetic field caused by electrical conductor), what earth inductor measured is earth's magnetic field
Size.Earth's magnetic field is a vector, and for a fixed place, this vector can be broken down into two and horizontal plane
Parallel component and one and the component of horizontal plane.If keeping earth inductor and plane-parallel, reference is formed
Three axles (X-axis, Y-axis, Z axis) of coordinate system are corresponding with above three component respectively.
It is preferred that obtain electrical conductor caused by magnetic field be superimposed with earth's magnetic field after superposition Magnetic Field before, in addition to：
Show measurement position information, the placement location sign of the measurement position information including the electrical conductor and
The references angle of measurement.
Specifically, when measuring electric current caused by electrical conductor, compass is opened, mobile phone is horizontal positioned and rotate mobile phone,
The pointer of compass is set to indicate references angle.The references angle is a certain angle on the horizontal plane pre-set, general feelings
Under condition, 0 degree may be configured as；It is 0 degree that references angle is assumed in the embodiment of the present invention.Display two is parallel on mobile phone display screen determines
Bit line, for indicating there is earth inductor in the range of two position lines.It is fixed that electrified wire can be pressed close to mobile phone back side battery edge
Bit line direction is placed between two position lines, that is, proceeds by the test of electric current.
, in a step 101, can by the earth inductor in mobile phone after electrical conductor is placed between two position lines
Obtain electrical conductor caused by magnetic field be superimposed with earth's magnetic field after superposition magnetic field and it is described be superimposed magnetic field caused by offset direction angle,
And then it can obtain component of the superposition magnetic field on the specified axle of reference frame according to the three-dimensional magnetic field data of acquisition；This hair
Offset direction angle caused by being superimposed magnetic field described in bright embodiment refers to be superimposed magnetic fields after earth inductor, causes pointer
The caused deviation angle relative to references angle.
Fig. 2 shows reference frame X-axis in the embodiment of the present invention, Y-axis, Z axis, the specified axle in the embodiment of the present invention
Refer to the Y-axis in reference frame.By acceleration transducer obtain pitch (angle of pitch and the angle turned about the X axis) and
After Yaw (roll angle and the angle rotated around Y-axis), it can obtain being superimposed point of the magnetic field on the specified axle in reference frame
Amount.
In a step 102, it is superimposed according to component of the earth's magnetic field on the specified axle of the reference frame with described
Component of the magnetic field on the specified axle of the reference frame, determines the sense of current in the electrical conductor；If describedly
Component of the magnetic field on the specified axle of the reference frame is less than specified axle of the superposition magnetic field in the reference frame
On component, it is determined that the sense of current is first direction；If point of the earth's magnetic field on the specified axle of the reference frame
Amount is more than component of the superposition magnetic field on the specified axle of the reference frame, it is determined that the sense of current is second direction.
Specifically, the sense of current in the electrical conductor is determined according to following manner：
IfThen determine that the sense of current is first direction；
IfThen determine that the sense of current is second direction；
IfThen determine that electric current is zero；
Wherein, Ey' it is component of the superposition magnetic field on the specified axle of reference frame；EyIt is earth's magnetic field in reference frame
Specified axle on component；
Further, if the sense of current is first direction, illustrate that magnetic field is in reference frame caused by electrical conductor
Specified axle on component of the component with earth's magnetic field on the specified axle of reference frame direction it is identical, therefore cause to be superimposed magnetic field
Component on specified axle of the superposition magnetic field in reference frame is more than the component on specified axle of the earth's magnetic field in reference frame；
If the sense of current is second direction, illustrate component of the magnetic field caused by electrical conductor on the specified axle of reference frame with
Component of the earth's magnetic field on the specified axle of reference frame it is in opposite direction, therefore cause be superimposed magnetic field superposition magnetic field with reference to sit
The component marked on the specified axle of system is less than component of the earth's magnetic field on the specified axle of reference frame.
In step 103, according to the sense of current and the offset direction angle, by inquiring about angle-electric current corresponding table,
Obtain current value corresponding with the offset direction angle；The angle-electric current corresponding table obtains angle-electric current by measuring in advance
Corresponding relation, the measurement in advance are carried out based on the measurement position information.
Specifically, the angle-electric current corresponding table is pre-stored within mobile phone, and angle-electric current corresponding table has two, and one
It is individual be with the sense of current be first angle-electric current corresponding table corresponding to first direction, it with the sense of current is second that another, which is,
Second angle-electric current corresponding table corresponding to direction.
When it is determined that the sense of current is first direction, inquiry first angle-electric current corresponding table is identified according to first direction, obtained
To current value corresponding with the offset direction angle；
When it is determined that the sense of current is second direction, it is corresponding that inquiry second angle-electric current is identified according to the second direction
Table, obtain current value corresponding with the offset direction angle.
Further, angle-electric current corresponding table is determined in the following manner：
The earth magnetism function of mobile phone is calibrated, and opens compass, mobile phone is horizontal positioned, and by rotating mobile phone, make guide
Pin points to certain angle, and the angle may be configured as the follow-up references angle for being used for measuring electrified wire electric current, generally,
Calculated for convenience of statistics, as it was previously stated, references angle can be arranged to 0 degree.Reference frame is on foregoing horizontal plane
X-axis, Y-axis and the Z axis with horizontal plane, and assume that the specified axle of the reference frame is Y-axis, earth's magnetic field is in Y-axis
On component be B.
Electrified wire is placed between two position lines (its modes of emplacement and the foregoing modes of emplacement in measurement process
Unanimously), angle-electric current corresponding table can be obtained by changing the size of current in electrified wire.When the electric current in wire is 0
When, caused magnetic field is 0, and now pointer still points to 0 degree；Then in electrified wire both ends making alive, when the electricity in electrified wire
Flow for I1 when, the component of caused magnetic field on the y axis is BI, if BI is identical with B direction, it is caused superposition magnetic fields arrive
Cause the angular turn θ of compass on earth inductor1, now the registration of compass is θ1, i.e. angle corresponding to electric current I1 is
θ1.It is identical for the direction of component of the component of magnetic field on the y axis with earth's magnetic field on the y axis caused by the electric current in electrified wire
Situation, by the electric current in electrical conductor from 0 gradually increase, and record the deflecting angle of the compass corresponding to different size of current
Degree, so as to obtain first angle-electric current corresponding table；Then, electrified wire opposite direction (selecting 180 degree along the horizontal plane) is placed,
Increase electric current again as described above, now the component of magnetic field on the y axis caused by the electric current in electrified wire and earth's magnetic field are in y-axis
On component it is in opposite direction, by the electric current in electrical conductor from 0 gradually increase, and record the finger corresponding to different size of current
The deviation angle of compass, so as to obtain second angle-electric current corresponding table.Obtain two angles-electric current corresponding table is stored in advance
In mobile phone, to inquire the current value corresponding with offset direction angle when using mobile phone for measuring electric current.
The embodiment of the present invention, which realizes, utilizes the electric current in the terminal measurement electrical conductor with earth inductor, test side
Method is simple, and the hardware cost for not increasing terminal can complete the measurement of electric current.
For above method flow, the embodiment of the present invention also provides a kind of terminal, and the particular content of the terminal is referred to
The above method is implemented, and will not be repeated here.
Fig. 3 is a kind of terminal schematic diagram provided in an embodiment of the present invention, including：
Sensor 301, for for obtaining the superposition magnetic field after magnetic field is superimposed with earth's magnetic field caused by electrical conductor and institute
State offset direction angle caused by superposition magnetic field；Determine component of the superposition magnetic field on the specified axle of reference frame；
Processor 302, for being folded according to component of the earth's magnetic field on the specified axle of the reference frame with described
Add component of the magnetic field on the specified axle of the reference frame, determine the sense of current in the electrical conductor；According to institute
The sense of current, the offset direction angle and angle-electric current corresponding table are stated, it is determined that electric current corresponding with the offset direction angle
Value；
Memory 303, for storing the angle-electric current corresponding table.
Sensor 301 includes earth inductor and acceleration induction device in the embodiment of the present invention；The earth inductor is used
Superposition magnetic field after magnetic field caused by obtaining the electrical conductor is superimposed with earth's magnetic field, the acceleration transducer are used to obtain
Pitch (angle of pitch and the angle turned about the X axis) and raw (roll angle and the angle rotated around Y-axis), so as to obtain being superimposed magnetic
Component of the field on the specified axle in reference frame.
It is preferred that the processor 302 is additionally operable to：
Compare component of the earth's magnetic field on the specified axle of the reference frame with the magnetic field that is superimposed in the ginseng
The size of the component on the specified axle of coordinate system is examined, if component of the earth's magnetic field on the specified axle of the reference frame is small
In component of the superposition magnetic field on the specified axle of the reference frame, it is determined that the sense of current is first direction；If institute
State component of the earth's magnetic field on the specified axle of the reference frame and be more than finger of the superposition magnetic field in the reference frame
Component on dead axle, it is determined that the sense of current is second direction.
Specifically, the processor 302 is specifically used for determining the electric current side in the electrical conductor according to following manner
To：
IfThen determine that the sense of current is first direction；
IfThen determine that the sense of current is second direction；
IfThen determine that electric current is zero；
Wherein, Ey' it is component of the superposition magnetic field on the specified axle of reference frame；EyIt is earth's magnetic field in reference frame
Specified axle on component；
It is preferred that the terminal also includes：
Display screen 304, for showing measurement position information, the measurement position information includes the placement of the electrical conductor
Position instruction identifies and the references angle of measurement.
It is preferred that the processor 302 is additionally operable to：
According to the sense of current and the offset direction angle, by inquiring about angle-electric current corresponding table, obtain with it is described partially
From current value corresponding to deflection, the angle-electric current corresponding table obtains angle-electric current corresponding relation, institute by measuring in advance
Measurement in advance is stated to carry out based on the measurement position information.
It is preferred that the processor 302 is additionally operable to：
It is first direction to determine the sense of current, then identifies inquiry first angle-electric current pair according to the first direction
Table is answered, obtains current value corresponding with the offset direction angle；
It is second direction to determine the sense of current, then identifies inquiry second angle-electric current pair according to the second direction
Table is answered, obtains current value corresponding with the offset direction angle.
From above content：The embodiment of the present invention is by obtaining after magnetic field is superimposed with earth's magnetic field caused by electrical conductor
It is superimposed offset direction angle caused by magnetic field and the superposition magnetic field；Determine the superposition magnetic field on the specified axle of reference frame
Component；According to component of the earth's magnetic field on the specified axle of the reference frame with the magnetic field that is superimposed in the reference
Component on the specified axle of coordinate system, determines the sense of current in the electrical conductor；According to the sense of current with it is described
Offset direction angle, by inquiring about the corresponding table prestored, it is determined that current value corresponding with the offset direction angle.It is of the invention real
Applying example realizes using the electric current in the terminal measurement electrical conductor with earth inductor, and method of testing is simple, and does not increase
The hardware cost of terminal is added to complete the measurement of electric current.
It should be understood by those skilled in the art that, embodiments of the invention can be provided as method or computer program product.
Therefore, the present invention can be using the embodiment in terms of complete hardware embodiment, complete software embodiment or combination software and hardware
Form.Deposited moreover, the present invention can use to can use in one or more computers for wherein including computer usable program code
The shape for the computer program product that storage media is implemented on (including but is not limited to magnetic disk storage, CD-ROM, optical memory etc.)
Formula.
The present invention is the flow with reference to method according to embodiments of the present invention, equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that can be by every first-class in computer program instructions implementation process figure and/or block diagram
Journey and/or the flow in square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided
The processors of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that produced by the instruction of computer or the computing device of other programmable data processing devices for real
The device for the function of being specified in present one flow of flow chart or one square frame of multiple flows and/or block diagram or multiple square frames.
These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which produces, to be included referring to
Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or
The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, so as in computer or
The instruction performed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in individual square frame or multiple square frames.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation
Property concept, then can make other change and modification to these embodiments.So appended claims be intended to be construed to include it is excellent
Select embodiment and fall into having altered and changing for the scope of the invention.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these changes and modification.
Claims (10)
- A kind of 1. method for measuring electric current, it is characterised in that this method is applied to terminal, including：Magnetic field caused by obtaining electrical conductor be superimposed with earth's magnetic field after superposition magnetic field and described be superimposed the caused deviation side in magnetic field To angle；Determine component of the superposition magnetic field on the specified axle of reference frame；Magnetic field is superimposed described with reference to seat with described according to component of the earth's magnetic field on the specified axle of the reference frame The component on the specified axle of system is marked, determines the sense of current in the electrical conductor；According to the sense of current, the offset direction angle and angle-electric current corresponding table, it is determined that with the offset direction angle pair The current value answered.
- 2. the method as described in claim 1, it is characterised in that it is described according to the earth's magnetic field the reference frame finger Component and the component for being superimposed magnetic field on the specified axle of the reference frame on dead axle, determine the electrical conductor In the sense of current, including：If component of the earth's magnetic field on the specified axle of the reference frame is less than the superposition magnetic field described with reference to seat Mark the component on the specified axle of system, it is determined that the sense of current is first direction；If component of the earth's magnetic field on the specified axle of the reference frame is more than the superposition magnetic field described with reference to seat Mark the component on the specified axle of system, it is determined that the sense of current is second direction.
- 3. the method as described in claim 1, it is characterised in that after magnetic field caused by obtaining electrical conductor is superimposed with earth's magnetic field It is superimposed before magnetic field, in addition to：Measurement position information is shown, the measurement position information includes placement location sign and the measurement of the electrical conductor References angle.
- 4. method as claimed in claim 3, it is characterised in that it is described according to the sense of current and the offset direction angle, Current value corresponding with the offset direction angle is obtained, including：According to the sense of current and the offset direction angle, by inquiring about angle-electric current corresponding table, obtain and the deviation side To current value corresponding to angle, the angle-electric current corresponding table obtains angle-electric current corresponding relation by measuring in advance, described pre- First measurement is carried out based on the measurement position information.
- 5. method as claimed in claim 4, it is characterised in that it is described according to the sense of current, the offset direction angle with And angle-electric current corresponding table, it is determined that current value corresponding with the offset direction angle, including：It is first direction to determine the sense of current, then identifies inquiry first angle-electric current corresponding table according to the first direction, Obtain current value corresponding with the offset direction angle；It is second direction to determine the sense of current, then identifies inquiry second angle-electric current corresponding table according to the second direction, Obtain current value corresponding with the offset direction angle.
- A kind of 6. terminal, it is characterised in that including：Sensor, draw for obtaining the superposition magnetic field after magnetic field is superimposed with earth's magnetic field caused by electrical conductor and the superposition magnetic field The offset direction angle risen；Determine component of the superposition magnetic field on the specified axle of reference frame；Processor, for being existed according to component of the earth's magnetic field on the specified axle of the reference frame with the magnetic field that is superimposed Component on the specified axle of the reference frame, determines the sense of current in the electrical conductor；According to the electric current side To, the offset direction angle and angle-electric current corresponding table, it is determined that current value corresponding with the offset direction angle；Memory, for storing the angle-electric current corresponding table.
- 7. terminal as claimed in claim 6, it is characterised in that the processor is additionally operable to：Compare component of the earth's magnetic field on the specified axle of the reference frame and be superimposed magnetic field described with reference to seat with described The size of the component on the specified axle of system is marked, if component of the earth's magnetic field on the specified axle of the reference frame is less than institute State component of the superposition magnetic field on the specified axle of the reference frame, it is determined that the sense of current is first direction；If describedly Component of the magnetic field on the specified axle of the reference frame is more than specified axle of the superposition magnetic field in the reference frame On component, it is determined that the sense of current is second direction.
- 8. terminal as claimed in claim 6, it is characterised in that also include：Display screen, for showing measurement position information, the placement location that the measurement position information includes the electrical conductor refers to Indicating knows and the references angle of measurement.
- 9. terminal as claimed in claim 8, it is characterised in that the processor is additionally operable to：According to the sense of current and the offset direction angle, by inquiring about angle-electric current corresponding table, obtain and the deviation side To current value corresponding to angle, the angle-electric current corresponding table obtains angle-electric current corresponding relation by measuring in advance, described pre- First measurement is carried out based on the measurement position information.
- 10. terminal as claimed in claim 9, it is characterised in that the processor is additionally operable to：It is first direction to determine the sense of current, then identifies inquiry first angle-electric current corresponding table according to the first direction, Obtain current value corresponding with the offset direction angle；It is second direction to determine the sense of current, then identifies inquiry second angle-electric current corresponding table according to the second direction, Obtain current value corresponding with the offset direction angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510034026.2A CN104614570B (en) | 2015-01-22 | 2015-01-22 | A kind of method and device for measuring electric current |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510034026.2A CN104614570B (en) | 2015-01-22 | 2015-01-22 | A kind of method and device for measuring electric current |
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| Publication Number | Publication Date |
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| CN104614570A CN104614570A (en) | 2015-05-13 |
| CN104614570B true CN104614570B (en) | 2017-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510034026.2A Active CN104614570B (en) | 2015-01-22 | 2015-01-22 | A kind of method and device for measuring electric current |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106323257A (en) * | 2016-10-20 | 2017-01-11 | Comlab（北京）通信系统设备有限公司 | Direction angle measuring device and measuring method based on active magnetic field |
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| CN85205570U (en) * | 1985-12-23 | 1987-07-22 | 周永亮 | Geomagnetic universal electric meter |
| CN201181324Y (en) * | 2007-12-10 | 2009-01-14 | 宋颖男 | Simple battery detection apparatus |
| CN102645570A (en) * | 2012-04-13 | 2012-08-22 | 惠州Tcl移动通信有限公司 | Hand-held electronic equipment-based galvanometer |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005033718A1 (en) * | 2003-10-01 | 2005-04-14 | Eaton Corporation | Integrated anti-differential current sensing system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85205570U (en) * | 1985-12-23 | 1987-07-22 | 周永亮 | Geomagnetic universal electric meter |
| CN201181324Y (en) * | 2007-12-10 | 2009-01-14 | 宋颖男 | Simple battery detection apparatus |
| CN102645570A (en) * | 2012-04-13 | 2012-08-22 | 惠州Tcl移动通信有限公司 | Hand-held electronic equipment-based galvanometer |
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| Title |
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| xploring Magnetic Fields with a Compass;Brandon Lunk and Robert Beichner;《The Physics Teacher》;20110131;第49卷;第45-48页 * |
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