CN104407312A - Power frequency weak magnetic detector - Google Patents
Power frequency weak magnetic detector Download PDFInfo
- Publication number
- CN104407312A CN104407312A CN201410720013.6A CN201410720013A CN104407312A CN 104407312 A CN104407312 A CN 104407312A CN 201410720013 A CN201410720013 A CN 201410720013A CN 104407312 A CN104407312 A CN 104407312A
- Authority
- CN
- China
- Prior art keywords
- pin
- chip
- liquid crystal
- crystal display
- conversion chip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses a power frequency weak magnetic detector. The power frequency weak magnetic detector comprises a main frame, a weak magnetic sensing input cable and a power cable, wherein a weak magnetic sensing input socket is arranged on one side surface of the casing of the main frame and is connected with the weak magnetic sensing input cable; a power socket is arranged on the other side surface of the casing of the main frame and is connected with the power cable; a liquid crystal display arranged on the upper cover of the casing of the main frame; a circuit board is mounted inside the casing of the main frame; the circuit of the circuit board comprises a weak magnetic signal input terminal, an AD (analog to digital) converting circuit, a microprocessing unit control interface circuit, a liquid crystal display circuit and a DC-DC (direct current) insolating power circuit. The power frequency weak magnetic detector has the advantages that the power supply insulation is adopted, the ripple noise is low, power frequency magnetic field in unknown directions can be detected, and the detection precision can reach less than 1 millimeter, so that an effective monitoring measure is provided for the environment power frequency magnetic field.
Description
Art
The present invention relates to magnetic field detection field, be specifically related to the weak Magnetic testi instrument of power frequency.
Background technology
Along with the development of modern electronic technology, electromagnetic pollution is also more and more serious on the able-bodied impact of human body, research for environment pollution with electromagnet also more and more receives the concern of people with control, the impact of power frequency electromagnetic field on biosome that wherein defeated modified line road produces is one of problem of being concerned about the most of people, but because the useful signal of the weak magnetic of power frequency is very faint, to from power supply of the prior art and line noise very responsive, thus cause very large measuring error, at present the measurement means for environment power frequency magnetic field is also short of very much.
Summary of the invention
The object of the present invention is to provide the weak Magnetic testi instrument of a kind of power frequency, the weak Magnetic testi instrument of this power frequency has power supply isolation, low ripple noise, can detection side to the power frequency magnetic field of the unknown, accuracy of detection can reach below a milli height, thus provides effective monitoring means for environment power frequency magnetic field.
In order to achieve the above object, technical scheme of the present invention is as follows:
Described a kind of power frequency weak Magnetic testi instrument comprises a main frame, a weak magnetic sensing input cable and a feed cable.Main frame has a rectangle shell, and a side of host housing is provided with weak magnetic sensing input socket, and weak magnetic sensing input socket is connected with weak magnetic sensing input cable; Another side of host housing is provided with supply socket, and supply socket is connected with feed cable; Host housing is covered with liquid crystal display slotted eye, liquid crystal display is for showing weak magnetic strength angle value; One piece of circuit board is equipped with in host housing inside, and the circuit of this circuit board is inputted by weak magnetic signal and A/D convertor circuit, Microprocessor S3C44B0X interface circuit, liquid crystal display circuit and DC-DC insulating power supply circuit formed; Connector J1 on circuit board is connected with the weak magnetic sensing input socket of host housing; Liquid crystal display module U6 on circuit board is embedded in the liquid crystal display slotted eye of host housing; Power supply VCC on circuit board and ground wire GND is connected with the supply socket of host housing.
On described circuit board, weak magnetic signal input and A/D convertor circuit are made up of connector J1, adjustable resistance R4, potentiometer R3, resistance R1, resistance R2 and AD conversion chip U2; The pin one of connector J1 is connected with the pin 9 of AD conversion chip U2; The pin two of connector J1 is connected with the pin one 3 of AD conversion chip U2; The pin one 0 of AD conversion chip U2 is connected with the pin 8 of AD conversion chip U2 through adjustable resistance R4; The pin one 2 of AD conversion chip U2 is connected with ground wire GNDA through adjustable resistance R2; The pin one 2 of AD conversion chip U2 is connected with the pin 3 of potentiometer R3 through adjustable resistance R1; The pin one 1 of AD conversion chip U2 is connected with the pin two of potentiometer R3; The pin 7 of AD conversion chip U2 is connected with the pin one of potentiometer R3; Potentiometer R3 is connected across between the pin 3 of insulating power supply module U1 and pin 5.
Described Microprocessor S3C44B0X interface circuit is made up of singlechip chip U4, latch chip U3 and gate circuit chip U5; The pin two of latch chip U3 is connected with the pin 4 of AD conversion chip U2; The pin 5 of latch chip U3 is connected with the pin 5 of AD conversion chip U2; The pin 6 of latch chip U3 is connected with the pin 3 of AD conversion chip U2; The pin 3 of latch chip U3 is connected with the pin one 6 of AD conversion chip U2; The pin 4 of latch chip U3 is connected with the pin one 7 of AD conversion chip U2; The pin 7 of latch chip U3 is connected with the pin one 8 of AD conversion chip U2; The pin 8 of latch chip U3 is connected with the pin one 9 of AD conversion chip U2; The pin one 3 of latch chip U3 is connected with the pin two 0 of AD conversion chip U2; The pin one 4 of latch chip U3 is connected with the pin two 1 of AD conversion chip U2; The pin one 7 of latch chip U3 is connected with the pin two 2 of AD conversion chip U2; The pin one 8 of latch chip U3 is connected with the pin two 3 of AD conversion chip U2; The pin 39 of singlechip chip U4 is connected with the pin one 6 of AD conversion chip U2; The pin 38 of singlechip chip U4 is connected with the pin one 7 of AD conversion chip U2; The pin 37 of singlechip chip U4 is connected with the pin one 8 of AD conversion chip U2; The pin 36 of singlechip chip U4 is connected with the pin one 9 of AD conversion chip U2; The pin 35 of singlechip chip U4 is connected with the pin two 0 of AD conversion chip U2; The pin 34 of singlechip chip U4 is connected with the pin two 1 of AD conversion chip U2; The pin 33 of singlechip chip U4 is connected with the pin two 2 of AD conversion chip U2; The pin 32 of singlechip chip U4 is connected with the pin two 3 of AD conversion chip U2; The pin one 2 of singlechip chip U4 is connected with the pin two 7 of AD conversion chip U2; The pin 30 of singlechip chip U4 is connected with the pin one 1 of latch chip U3; The pin two of the pin one 6 AND circuit chip U5 of singlechip chip U4 is connected; The pin one of the pin one 7 AND circuit chip U5 of singlechip chip U4 is connected; The pin 3 of gate circuit chip U5 is connected with the pin 6 of AD conversion chip U2; The pin one of latch chip U3 is connected with ground wire GND.
On described circuit board, liquid crystal display circuit is made up of liquid crystal display module U6 and potentiometer R5; The pin 6 of liquid crystal display module U6 is connected with the pin one 5 of singlechip chip U4; The pin 4 of liquid crystal display module U6 is connected with the pin one 4 of singlechip chip U4; The pin one 4 of liquid crystal display module U6 is connected with the pin 8 of singlechip chip U4; The pin one 3 of liquid crystal display module U6 is connected with the pin 7 of singlechip chip U4; The pin one 2 of liquid crystal display module U6 is connected with the pin 6 of singlechip chip U4; The pin one 1 of liquid crystal display module U6 is connected with the pin 5 of singlechip chip U4; The pin one 0 of liquid crystal display module U6 is connected with the pin 4 of singlechip chip U4; The pin 9 of liquid crystal display module U6 is connected with the pin 3 of singlechip chip U4; The pin 8 of liquid crystal display module U6 is connected with the pin two of singlechip chip U4; The pin 7 of liquid crystal display module U6 is connected with the pin one of singlechip chip U4; The pin one 6 of liquid crystal display module U6, pin 5 and pin one are connected with ground wire GNDA; The pin two of liquid crystal display module U6 is connected with the pin two of AD conversion chip U2; Power supply VCC is connected with ground wire GND through potentiometer R5; The pin 3 of potentiometer R5 is connected with the pin 3 of liquid crystal display module U6.
On described circuit board, DC-DC insulating power supply circuit is made up of insulating power supply module U1, electric capacity C1, electric capacity C2 and electric capacity C3; The pin two of insulating power supply module U1 is connected with ground wire GND; The pin one of insulating power supply module U1 is connected with power supply VCC; Between the pin one that electric capacity C1 is connected across insulating power supply module U1 and pin two; The pin 4 of insulating power supply module U1 is connected with ground wire GNDA; Electric capacity C2 is connected across between the pin 4 of insulating power supply module U1 and pin 5; Electric capacity C3 is connected across between the pin 3 of insulating power supply module U1 and pin 4.
The model of described singlechip chip U4 is STC89C52RC, and the model of AD conversion chip is AD574.
Magnetic field to be measured is converted to voltage signal by the external weak magnetic induction probe of the present invention, and transfers signal to AD574 and carry out analog to digital conversion, and the data after conversion enter single-chip microcomputer and carry out process and demarcate, and are shown by LCDs; Insulating power supply module U1 is isolation type positive-negative dual power supply, and restrained effectively electromagnetic interference (EMI) and eliminate ground loop, weak magnetic signal is not affected by power noise, and meanwhile, dual power supply can measure positive negative fluxfield simultaneously, makes the present invention not by the restriction of magnetic direction; AD conversion chip AD574 is 12 bit A/D converters, and resolution reaches four per milles, and namely 0.25 milli is high, and measuring accuracy is high, for environment power frequency magnetic field provides effective monitoring means.
Accompanying drawing explanation
Fig. 1 is main machine structure schematic diagram of the present invention.
Fig. 2 is theory diagram of the present invention.
Fig. 3 is circuit theory diagrams of the present invention.
Part numbers in accompanying drawing 1 is: 1 is main frame, and 2 is supply socket, and 3 is feed cable, and 4 is weak magnetic sensing input socket, and 5 is weak magnetic sensing input cable, and 6 is liquid crystal display slotted eye.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail.
Embodiment
See Fig. 1, Fig. 2, Fig. 3, the weak Magnetic testi instrument of a kind of power frequency, comprise the weak magnetic sensing input cable 5 of 1, one, a main frame and a feed cable 3.Main frame 1 has a rectangle shell, and a side of main frame 1 shell is provided with weak magnetic sensing input socket 4, and weak magnetic sensing input socket 4 is connected with weak magnetic sensing input cable 5; Another side of main frame 1 shell is provided with supply socket 2, and supply socket 2 is connected with feed cable 3; Main frame 1 outer casing upper cover is provided with liquid crystal display slotted eye 6, and liquid crystal display is for showing weak magnetic strength angle value; Main frame 1 enclosure is equipped with one piece of circuit board, and the circuit of this circuit board is inputted by weak magnetic signal and A/D convertor circuit, Microprocessor S3C44B0X interface circuit, liquid crystal display circuit and DC-DC insulating power supply circuit formed; Connector J1 on circuit board is connected with the weak magnetic sensing input socket 4 of main frame 1 shell; Liquid crystal display module U6 on circuit board is embedded in the liquid crystal display slotted eye 6 of main frame 1 shell; Power supply VCC on circuit board and ground wire GND is connected with the supply socket 2 of main frame 1 shell.
On described circuit board, weak magnetic signal input and A/D convertor circuit are made up of connector J1, adjustable resistance R4, potentiometer R3, resistance R1, resistance R2 and AD conversion chip U2; The pin one of connector J1 is connected with the pin 9 of AD conversion chip U2; The pin two of connector J1 is connected with the pin one 3 of AD conversion chip U2; The pin one 0 of AD conversion chip U2 is connected with the pin 8 of AD conversion chip U2 through adjustable resistance R4; The pin one 2 of AD conversion chip U2 is connected with ground wire GNDA through adjustable resistance R2; The pin one 2 of AD conversion chip U2 is connected with the pin 3 of potentiometer R3 through adjustable resistance R1; The pin one 1 of AD conversion chip U2 is connected with the pin two of potentiometer R3; The pin 7 of AD conversion chip U2 is connected with the pin one of potentiometer R3; Potentiometer R3 is connected across between the pin 3 of insulating power supply module U1 and pin 5.
Described Microprocessor S3C44B0X interface circuit is made up of singlechip chip U4, latch chip U3 and gate circuit chip U5; The pin two of latch chip U3 is connected with the pin 4 of AD conversion chip U2; The pin 5 of latch chip U3 is connected with the pin 5 of AD conversion chip U2; The pin 6 of latch chip U3 is connected with the pin 3 of AD conversion chip U2; The pin 3 of latch chip U3 is connected with the pin one 6 of AD conversion chip U2; The pin 4 of latch chip U3 is connected with the pin one 7 of AD conversion chip U2; The pin 7 of latch chip U3 is connected with the pin one 8 of AD conversion chip U2; The pin 8 of latch chip U3 is connected with the pin one 9 of AD conversion chip U2; The pin one 3 of latch chip U3 is connected with the pin two 0 of AD conversion chip U2; The pin one 4 of latch chip U3 is connected with the pin two 1 of AD conversion chip U2; The pin one 7 of latch chip U3 is connected with the pin two 2 of AD conversion chip U2; The pin one 8 of latch chip U3 is connected with the pin two 3 of AD conversion chip U2; The pin 39 of singlechip chip U4 is connected with the pin one 6 of AD conversion chip U2; The pin 38 of singlechip chip U4 is connected with the pin one 7 of AD conversion chip U2; The pin 37 of singlechip chip U4 is connected with the pin one 8 of AD conversion chip U2; The pin 36 of singlechip chip U4 is connected with the pin one 9 of AD conversion chip U2; The pin 35 of singlechip chip U4 is connected with the pin two 0 of AD conversion chip U2; The pin 34 of singlechip chip U4 is connected with the pin two 1 of AD conversion chip U2; The pin 33 of singlechip chip U4 is connected with the pin two 2 of AD conversion chip U2; The pin 32 of singlechip chip U4 is connected with the pin two 3 of AD conversion chip U2; The pin one 2 of singlechip chip U4 is connected with the pin two 7 of AD conversion chip U2; The pin 30 of singlechip chip U4 is connected with the pin one 1 of latch chip U3; The pin two of the pin one 6 AND circuit chip U5 of singlechip chip U4 is connected; The pin one of the pin one 7 AND circuit chip U5 of singlechip chip U4 is connected; The pin 3 of gate circuit chip U5 is connected with the pin 6 of AD conversion chip U2; The pin one of latch chip U3 is connected with ground wire GND.
On described circuit board, liquid crystal display circuit is made up of liquid crystal display module U6 and potentiometer R5; The pin 6 of liquid crystal display module U6 is connected with the pin one 5 of singlechip chip U4; The pin 4 of liquid crystal display module U6 is connected with the pin one 4 of singlechip chip U4; The pin one 4 of liquid crystal display module U6 is connected with the pin 8 of singlechip chip U4; The pin one 3 of liquid crystal display module U6 is connected with the pin 7 of singlechip chip U4; The pin one 2 of liquid crystal display module U6 is connected with the pin 6 of singlechip chip U4; The pin one 1 of liquid crystal display module U6 is connected with the pin 5 of singlechip chip U4; The pin one 0 of liquid crystal display module U6 is connected with the pin 4 of singlechip chip U4; The pin 9 of liquid crystal display module U6 is connected with the pin 3 of singlechip chip U4; The pin 8 of liquid crystal display module U6 is connected with the pin two of singlechip chip U4; The pin 7 of liquid crystal display module U6 is connected with the pin one of singlechip chip U4; The pin one 6 of liquid crystal display module U6, pin 5 and pin one are connected with ground wire GNDA; The pin two of liquid crystal display module U6 is connected with the pin two of AD conversion chip U2; Power supply VCC is connected with ground wire GND through potentiometer R5; The pin 3 of potentiometer R5 is connected with the pin 3 of liquid crystal display module U6.
On described circuit board, DC-DC insulating power supply circuit is made up of insulating power supply module U1, electric capacity C1, electric capacity C2 and electric capacity C3; The pin two of insulating power supply module U1 is connected with ground wire GND; The pin one of insulating power supply module U1 is connected with power supply VCC; Between the pin one that electric capacity C1 is connected across insulating power supply module U1 and pin two; The pin 4 of insulating power supply module U1 is connected with ground wire GNDA; Electric capacity C2 is connected across between the pin 4 of insulating power supply module U1 and pin 5; Electric capacity C3 is connected across between the pin 3 of insulating power supply module U1 and pin 4.
The model of described singlechip chip U4 is STC89C52RC, and the model of AD conversion chip is AD574.
Claims (2)
1. the weak Magnetic testi instrument of power frequency, comprise a main frame, a weak magnetic sensing input cable and a feed cable, it is characterized in that: main frame has a rectangle shell, a side of host housing is provided with weak magnetic sensing input socket, and weak magnetic sensing input socket is connected with weak magnetic sensing input cable; Another side of host housing is provided with supply socket, and supply socket is connected with feed cable; Host housing is covered with liquid crystal display slotted eye, liquid crystal display is for showing weak magnetic strength angle value; One piece of circuit board is equipped with in host housing inside, and the circuit of this circuit board is inputted by weak magnetic signal and A/D convertor circuit, Microprocessor S3C44B0X interface circuit, liquid crystal display circuit and DC-DC insulating power supply circuit formed; Connector J1 on circuit board is connected with the weak magnetic sensing input socket of host housing; Liquid crystal display module U6 on circuit board is embedded in the liquid crystal display slotted eye of host housing; Power supply VCC on circuit board and ground wire GND is connected with the supply socket of host housing.
2. the weak Magnetic testi instrument of a kind of power frequency according to claim 1, is characterized in that: on described circuit board, weak magnetic signal input and A/D convertor circuit are made up of connector J1, adjustable resistance R4, potentiometer R3, resistance R1, resistance R2 and AD conversion chip U2; The pin one of connector J1 is connected with the pin 9 of AD conversion chip U2; The pin two of connector J1 is connected with the pin one 3 of AD conversion chip U2; The pin one 0 of AD conversion chip U2 is connected with the pin 8 of AD conversion chip U2 through adjustable resistance R4; The pin one 2 of AD conversion chip U2 is connected with ground wire GNDA through adjustable resistance R2; The pin one 2 of AD conversion chip U2 is connected with the pin 3 of potentiometer R3 through adjustable resistance R1; The pin one 1 of AD conversion chip U2 is connected with the pin two of potentiometer R3; The pin 7 of AD conversion chip U2 is connected with the pin one of potentiometer R3; Potentiometer R3 is connected across between the pin 3 of insulating power supply module U1 and pin 5; Described Microprocessor S3C44B0X interface circuit is made up of singlechip chip U4, latch chip U3 and gate circuit chip U5; The pin two of latch chip U3 is connected with the pin 4 of AD conversion chip U2; The pin 5 of latch chip U3 is connected with the pin 5 of AD conversion chip U2; The pin 6 of latch chip U3 is connected with the pin 3 of AD conversion chip U2; The pin 3 of latch chip U3 is connected with the pin one 6 of AD conversion chip U2; The pin 4 of latch chip U3 is connected with the pin one 7 of AD conversion chip U2; The pin 7 of latch chip U3 is connected with the pin one 8 of AD conversion chip U2; The pin 8 of latch chip U3 is connected with the pin one 9 of AD conversion chip U2; The pin one 3 of latch chip U3 is connected with the pin two 0 of AD conversion chip U2; The pin one 4 of latch chip U3 is connected with the pin two 1 of AD conversion chip U2; The pin one 7 of latch chip U3 is connected with the pin two 2 of AD conversion chip U2; The pin one 8 of latch chip U3 is connected with the pin two 3 of AD conversion chip U2; The pin 39 of singlechip chip U4 is connected with the pin one 6 of AD conversion chip U2; The pin 38 of singlechip chip U4 is connected with the pin one 7 of AD conversion chip U2; The pin 37 of singlechip chip U4 is connected with the pin one 8 of AD conversion chip U2; The pin 36 of singlechip chip U4 is connected with the pin one 9 of AD conversion chip U2; The pin 35 of singlechip chip U4 is connected with the pin two 0 of AD conversion chip U2; The pin 34 of singlechip chip U4 is connected with the pin two 1 of AD conversion chip U2; The pin 33 of singlechip chip U4 is connected with the pin two 2 of AD conversion chip U2; The pin 32 of singlechip chip U4 is connected with the pin two 3 of AD conversion chip U2; The pin one 2 of singlechip chip U4 is connected with the pin two 7 of AD conversion chip U2; The pin 30 of singlechip chip U4 is connected with the pin one 1 of latch chip U3; The pin two of the pin one 6 AND circuit chip U5 of singlechip chip U4 is connected; The pin one of the pin one 7 AND circuit chip U5 of singlechip chip U4 is connected; The pin 3 of gate circuit chip U5 is connected with the pin 6 of AD conversion chip U2; The pin one of latch chip U3 is connected with ground wire GND; On described circuit board, liquid crystal display circuit is made up of liquid crystal display module U6 and potentiometer R5; The pin 6 of liquid crystal display module U6 is connected with the pin one 5 of singlechip chip U4; The pin 4 of liquid crystal display module U6 is connected with the pin one 4 of singlechip chip U4; The pin one 4 of liquid crystal display module U6 is connected with the pin 8 of singlechip chip U4; The pin one 3 of liquid crystal display module U6 is connected with the pin 7 of singlechip chip U4; The pin one 2 of liquid crystal display module U6 is connected with the pin 6 of singlechip chip U4; The pin one 1 of liquid crystal display module U6 is connected with the pin 5 of singlechip chip U4; The pin one 0 of liquid crystal display module U6 is connected with the pin 4 of singlechip chip U4; The pin 9 of liquid crystal display module U6 is connected with the pin 3 of singlechip chip U4; The pin 8 of liquid crystal display module U6 is connected with the pin two of singlechip chip U4; The pin 7 of liquid crystal display module U6 is connected with the pin one of singlechip chip U4; The pin one 6 of liquid crystal display module U6, pin 5 and pin one are connected with ground wire GNDA; The pin two of liquid crystal display module U6 is connected with the pin two of AD conversion chip U2; Power supply VCC is connected with ground wire GND through potentiometer R5; The pin 3 of potentiometer R5 is connected with the pin 3 of liquid crystal display module U6; On described circuit board, DC-DC insulating power supply circuit is made up of insulating power supply module U1, electric capacity C1, electric capacity C2 and electric capacity C3; The pin two of insulating power supply module U1 is connected with ground wire GND; The pin one of insulating power supply module U1 is connected with power supply VCC; Between the pin one that electric capacity C1 is connected across insulating power supply module U1 and pin two; The pin 4 of insulating power supply module U1 is connected with ground wire GNDA; Electric capacity C2 is connected across between the pin 4 of insulating power supply module U1 and pin 5; Electric capacity C3 is connected across between the pin 3 of insulating power supply module U1 and pin 4; The model of described singlechip chip U4 is STC89C52RC, and the model of AD conversion chip is AD574.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410720013.6A CN104407312A (en) | 2014-12-02 | 2014-12-02 | Power frequency weak magnetic detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410720013.6A CN104407312A (en) | 2014-12-02 | 2014-12-02 | Power frequency weak magnetic detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104407312A true CN104407312A (en) | 2015-03-11 |
Family
ID=52644957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410720013.6A Pending CN104407312A (en) | 2014-12-02 | 2014-12-02 | Power frequency weak magnetic detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104407312A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2419605Y (en) * | 1999-09-24 | 2001-02-14 | 华南师范大学 | Automatic range switching and zero resetting magnet measuring instrument |
| JP2004069695A (en) * | 2002-07-25 | 2004-03-04 | Asahi Kasei Electronics Co Ltd | Magnetic sensor for pointing device |
| CN202033466U (en) * | 2011-02-28 | 2011-11-09 | 上海奥波信息科技有限公司 | Weak magnetic field measuring device |
| CN203720340U (en) * | 2014-03-16 | 2014-07-16 | 四川农业大学 | Three-dimensional magnetic field intensity measuring instrument |
| CN203930031U (en) * | 2014-06-27 | 2014-11-05 | 长沙理工大学 | A kind of electric wire sniffer detecting based on weak magnetic |
-
2014
- 2014-12-02 CN CN201410720013.6A patent/CN104407312A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2419605Y (en) * | 1999-09-24 | 2001-02-14 | 华南师范大学 | Automatic range switching and zero resetting magnet measuring instrument |
| JP2004069695A (en) * | 2002-07-25 | 2004-03-04 | Asahi Kasei Electronics Co Ltd | Magnetic sensor for pointing device |
| CN202033466U (en) * | 2011-02-28 | 2011-11-09 | 上海奥波信息科技有限公司 | Weak magnetic field measuring device |
| CN203720340U (en) * | 2014-03-16 | 2014-07-16 | 四川农业大学 | Three-dimensional magnetic field intensity measuring instrument |
| CN203930031U (en) * | 2014-06-27 | 2014-11-05 | 长沙理工大学 | A kind of electric wire sniffer detecting based on weak magnetic |
Non-Patent Citations (5)
| Title |
|---|
| 佚名: "AD574A与MCS-51单片机接口", 《电子技术资料网站》 * |
| 张智杰: "AD574在数据采集中的应用", 《国外电子元器件》 * |
| 捷配电子市场: "AD574A与单片机的接口电路图", 《捷配电子市场网》 * |
| 捷配电子市场: "AD574应用电路", 《捷配电子市场网》 * |
| 贾俊: "AD574在工频弱磁测量仪中的应用", 《世界电子元器件》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202837403U (en) | Portable tester for mud resistivity | |
| CN203365535U (en) | Vehicle current collection system and car having same | |
| CN103245824A (en) | Non-contact D-dot voltage transformer and voltage detection self-correcting method thereof | |
| CN203551116U (en) | Device for collecting temperature of high-voltage overhead transmission line | |
| CN106443213A (en) | Device used for live-line detection of defective three-dimensional electric field in high voltage insulator | |
| CN202853643U (en) | Wireless sensor | |
| CN104407312A (en) | Power frequency weak magnetic detector | |
| CN201868855U (en) | Rotor grounding protection device | |
| CN200989917Y (en) | Voltage sensor | |
| CN205176148U (en) | Portable electromagnetic radiation measures appearance | |
| CN205752732U (en) | A kind of sensor coaxial cable BNC connector insulation protection device | |
| CN204902874U (en) | Anti thump and high pressure resistant temperature and pressure sensor composite set | |
| CN203812059U (en) | A remote measurement and control terminal apparatus | |
| CN102901544B (en) | Material position and temperature sensor | |
| CN210534228U (en) | Portable voltage monitoring wireless log recording device | |
| CN207502619U (en) | A kind of integrated power frequency electromagnet field sensor and on-Line Monitor Device | |
| CN203365524U (en) | Electronic voltage transformer | |
| CN103335726A (en) | Binding band type infrared wireless temperature measuring device | |
| CN203563592U (en) | Electric power bird repellent device with rainwater pH value monitoring function | |
| CN207163475U (en) | A kind of magnetic absolute angle sensor | |
| CN205642625U (en) | First wireless thermoscope of cable plug in cubical switchboard | |
| CN208333722U (en) | A kind of civil engineering fiber grating soil pressure test macro | |
| CN207717916U (en) | Composite insulator insulation online detector | |
| CN107677297A (en) | A kind of protective device of photoelectric sensor and means of defence | |
| CN206684225U (en) | A kind of digital conductivity sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150311 |
|
| WD01 | Invention patent application deemed withdrawn after publication |