CN107727900A - A kind of modular electric energy meter - Google Patents
A kind of modular electric energy meter Download PDFInfo
- Publication number
- CN107727900A CN107727900A CN201711040172.1A CN201711040172A CN107727900A CN 107727900 A CN107727900 A CN 107727900A CN 201711040172 A CN201711040172 A CN 201711040172A CN 107727900 A CN107727900 A CN 107727900A
- Authority
- CN
- China
- Prior art keywords
- electric energy
- energy meter
- plug
- pcb board
- resistance
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
- G01R11/02—Constructional details
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The present invention relates to a kind of modular electric energy meter, each independent integrates multiple functional units of the electric energy meter；The functional unit realizes signal communication by inserting mode and electric energy meter pcb board (1) socket connection.Relative to prior art, modular electric energy meter of the invention not only expands the broad applicability of electric energy meter, and convenient production and management, cost-effective.
Description
Technical field
The present invention relates to electric energy meter counted fields, more particularly to a kind of modular electric energy meter.
Background technology
In order to meet the life requirement that people are become increasingly abundant and the living environment increasingly changed, electronic product is as conventional work
Tool, must also follow and constantly bring forth new ideas and change.Electric energy meter, as the device of metering user power consumption, certainly also row.
But existing electric energy meter does not have changeable function also, i.e., the function immobilization when dispatching from the factory of current electric energy meter,
Once the living environment of user changes, such as original electric energy meter present position allows staff to carry out closely meter reading, newly
Environment can not meet that closely meter reading operates, and be only capable of carrying out remote meter reading, then must be replaced with remote meter-reading function
Electric energy meter, but so not only cause the wasting of resources, while also increase user's living cost, it is often more important that electric energy meter is general
It is not high to change performance, production and management are inconvenient.
Although existing electric energy meter has the model for integrating multi-functional, but for a user, some functions of electric energy meter
There is no use value, user does not need, but must be bought together with the electric energy meter for possessing those functions during purchase, and multifunctional electric energy
Table is with respect to simple function electric energy meter, and costliness is many again for price, so also can further increase user uses burden.
The content of the invention
In view of the above problems, it is an object of the invention to provide a kind of function is integrated, modularization, versatile, production
Management is convenient, and cost-effective modular electric energy meter, the electric energy meter can realize civil power-operating voltage translation function, mould well
Blockization design facilitates the producer to change different modules according to the market demand, not only facilitates but also economizes on resources.
To achieve these goals, the technical solution adopted by the present invention is：A kind of modular electric energy meter, it is characterised in that：
Each independent integrates multiple functional units of the electric energy meter；
The functional unit realizes signal communication by inserting mode and electric energy meter pcb board socket connection.
Further, the functional unit is modular structure, the modular structure outwardly formed with groove,
The plug to stretch out is set in the groove, there is the inserting column for coordinating grafting with the groove on the pcb board, it is described
Have on inserting column and the jack that plug contacts conducting with pcb board is inserted and be suitable to for plug.
Further, the jack diameter is first gradually reduced firmly to clamp plug along plug direction of insertion, rear gradually to increase
It is easy to plug ends fully to be contacted with pcb board greatly.
Further, the pcb board surface is outwardly formed the metallic channel suitable for plug described in plug insertion and firm clamping,
The inserting column is located at the metallic channel periphery.
Further, the plug is contact pin structure or flake structure, and the end of the contact pin or thin slice is in plane.
Further, the modular electric energy meter includes the power supply for unit power supply with pcb board socket connection
Unit, the control unit for controlling unit work, the liquid crystal display that data are shown is carried out according to the information of control unit transmission
Unit, the carrier units that civil power is converted into operating voltage.
Further, the carrier units include conversion chip (J41), and the conversion chip (J41) passes through the first partial pressure
Resistance (R41), the second divider resistance (R42), the 3rd divider resistance (R43), the 4th divider resistance (R44) connect with control unit
Receiving end (PLC_RXD), transmitting terminal (PLC_TXD), reset terminal (PLC_RST), triggering end (PLC_EVENOUT) are corresponding to be connected, institute
The first divider resistance (R41), the second divider resistance (R42), the 3rd divider resistance (R43) are stated between the corresponding ports of control unit
Connect pull-up resistor, the 4th divider resistance (R44) connection pull down resistor.Carrier units can refer to the low frequency carrier signal from concentrator
Order is converted into high-frequency digital signal, and carries out data despreading to data signal, instantly electric according to the data command collection after despreading
Can table corresponding data, after collection data message through the carrier units modulation conversion into carrier wave answer signal, input electric power
Line is communicated, and to realize centralized automatic meter-reading function, is changed the meter reading mode of operation of staff, is improved operating efficiency.
Further, the power subsystem include be sequentially connected common mode inductance, rectification-balancing circuitry, Switching Power Supply become
Depressor, civil power can be converted into operating voltage.
Further, the rectification-balancing circuitry includes the first diode for rectification, the second diode and for rising
The first resistor of balanced voltage effect, second resistance, 3rd resistor, the 4th resistance, the positive pole and common mode inductance of the first diode
The connection of an output end, the negative pole of the first diode connects the positive pole of the second diode, and the negative pole of the second diode is with connecting
Backend load is connected after the first resistor of connection, second resistance parallel connection, the first resistor that is connected in series, the other end of second resistance
Be connected in series 3rd resistor, be connected backend load after the 4th resistor coupled in parallel, the 3rd resistor that is connected in series, the 4th resistance
The other end connects another output end of common mode inductance.
Further, the liquid crystal display includes chip of LCD (N31), the chip of LCD (N31)
Power port (VDD) be connected by the RC filter circuits of ground connection with control unit, the input and output of chip of LCD (N31)
Input/output terminal (LCD_SDA) directly with control unit of (SDA), clock end (SCL), clock end (LCD_SCL) is held to be connected.
Compared with prior art, the advantage of the invention is that：Each functional unit of electric energy meter uses inserting mode and PCB
Plate connects, and each interface allows manufacturer or user changing electric energy meter pcb board using unified standard, the standardized designs
On the basis of structure, functional module corresponding to selection replacing, both saves cost as needed, while easy to operate, and
This kind, which designs, causes electric energy meter to have broad applicability, convenient production and management；And the convenient electricity of carrier units design of electric energy meter
Information interchange between energy table and concentrator, changes meter reading pattern, improves the operating efficiency of staff；And power subsystem is adopted
With common mode inductance, bridge rectifier, switching mode power supply transformer circuit, the conversion of AC-DC can be effectively realized, can be electric energy meter
Work provides burning voltage, improves the job stability of electric energy meter.
Brief description of the drawings
Fig. 1 is the overall structure diagram of modular electric energy meter of the present invention.
Fig. 2 is the connected structure schematic diagram of modular electric energy meter of the present invention.
Fig. 3 (a), 3 (b) are respectively modular electric energy meter embodiment one of the present invention, the pcb board grafting internal junction of embodiment two
Structure schematic diagram.
Fig. 4 is the carrier units electrical schematic diagram of modular electric energy meter of the present invention.
Fig. 5 is the power subsystem electrical schematic diagram of modular electric energy meter of the present invention.
Fig. 6 is the display unit electrical schematic diagram of modular electric energy meter of the present invention.
Fig. 7 is the control unit electrical schematic diagram of modular electric energy meter of the present invention.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.
Embodiment one
A kind of connected structure of modular electric energy meter of the present invention is shown referring to Fig. 2,3 (a).The modular electric energy meter it is each
Individual functional unit realizes that electric signal connects with the pcb board 1 of integrated, modular mode and electric energy meter.Specifically, electric energy meter
Each independent is integrated each functional unit, forms modular structure, and modules structure is connected by inserting mode with pcb board 1.
As shown in Fig. 2 modular structure outwardly formed with groove 61, the plug to stretch out is set in groove 61
62, there is on pcb board 1 inserting column 63 for coordinating grafting with groove 61, have on inserting column 63 and inserted for plug 62 and be suitable to plug
62 contact the jack 64 of conducting with pcb board 1.Under this kind of frame mode, there is exposed metal conduction part 11, such as on pcb board 1
Sheet metal etc., when plug 62 inserts through jack 64, just with the good contact of sheet metal 11 on pcb board 1, realize telecommunications
Number connection.Inserting column 63 is mainly used in fixing modules structure, protects plug 62 not touched by other outside devices, causes to bend
Or short circuit etc..Inserting column 63 is connected with the adhesion of pcb board 1, is realized and is connected such as by modes such as scolding tin.
In order to prevent plug 62 from being come off from jack 64, the diameter of the jack 64 is first gradually reduced along the direction of insertion of plug 62
To firm plug 62 is just tightly blocked, then gradually increase, is easy to the end of plug 62 fully to be contacted with pcb board 1, and realization is well led
It is logical.In order to further ensure that the good electrical properties, the end that plug 62 contacts with pcb board 1 is in plane design.Certainly, plug
62 concrete shapes can design according to needs of production, such as can be contact pin shape or flake structure.
Embodiment two
Embodiment two the difference is that only that pcb board 1 realizes the structure conducted with modules structure with embodiment one
Difference, other structures are consistent, just repeat no more herein, only difference are illustrated at this.
As shown in Fig. 3 (b), the surface of pcb board 1 is outwardly formed the metal suitable for the insertion of plug 62 and firm the clamping plug 62
Groove 12,63 sets of inserting column are photographed on the periphery of metallic channel 12, for protecting plug 62 not touched by external devices, prevent short circuit or and PCB
Plate loose contact.
By each functional unit block Integrated design, and make to use system between the pcb board of each functional unit and electric energy meter
The inserting mode connection of one standard, can facilitate the producer to select different functional modules to carry out assembling collocation according to the market demand,
Namely in the case where being changed without electric energy meter pcb board, it is only necessary to replace corresponding functional unit, you can be assembled into new electric energy
Once table, it is by the circuit integration of each functional unit, modularization, so more due to functional unit block being designed
Change the functional unit, it is meant that replaced the circuit of the functional unit, and employed new circuit connection, based on this just
The electric energy meter for possessing another function can be realized.This kind, which designs, make it that the versatility of electric energy meter is more extensive, and produces and manage
It is more convenient, and can realize that a pcb board corresponds to the purpose of more money electric energy meters, cost has been saved, has also reduced making for user
Use cost.
Referring to shown in Fig. 1,4-7, as a modular electric energy meter of the present invention, the functional unit of the electric energy meter is various,
Including the control unit to be worked for power subsystem 2, the control unit of unit power supply with the socket connection of pcb board 1
3rd, the information transmitted according to control unit 3 carries out liquid crystal display 4 that data show, civil power is converted into the load of operating voltage
Ripple unit 5.Certainly, electric energy meter includes these more than functional units, in addition to other functional modules, other functional modules and upper
State module and realize assembling in a manner of present invention attachment structure claimed together.
Specifically, carrier units 5, which include conversion chip J41, the conversion chip J41, passes through the first divider resistance R41, the
Two divider resistance R42, the 3rd divider resistance R43, receiving terminal PLC_RXD, the transmitting terminal of the 4th divider resistance R44 and control unit
PLC_TXD, reset terminal PLC_RST, triggering end PLC_EVENOUT are corresponding to be connected, the first divider resistance R41, the second partial pressure
Pull-up resistor, the 4th divider resistance R44 connections are connected between resistance R42, the 3rd divider resistance R43 and control unit corresponding ports
Pull down resistor.The design of carrier units can facilitate electric energy meter effectively to refer to the low frequency carrier signal that concentrator comes through power line transmission
Order is converted into high-frequency digital signal, and carries out data despreading to data signal, instantly electric according to the data command collection after despreading
The corresponding data of energy table, and the data message modulation conversion after collection is carried out into carrier wave answer signal, input power line
Communication, conveniently realizes centralized automatic meter-reading, solves conventional staff and need to visit and copy power taking meter reading, the not only cumbersome and degree of accuracy is not
The problem of high, the operating efficiency of staff can be effectively improved.
The power subsystem 2 includes common mode inductance L1, rectification-balancing circuitry Q, the switching mode power supply transformer T1 being sequentially connected,
Wherein rectification-balancing circuitry Q includes for diode VD1, VD2 of rectification and the voltage after rectification is risen the resistance of balanced action
R101, R102, R103, R014, diode VD1 positive pole are connected with a common mode inductance L1 output end, and diode VD1's is negative
Pole connection diode VD2 positive pole, diode VD2 negative pole after resistance R101, R102 parallel connection being connected in series with being connected rear end
Load, resistance R101, R102 for the being connected in series other end are born with being connected rear end after resistance R103, R104 parallel connection being connected in series
Carry, resistance R103, R104 for being connected in series other end connection common mode inductance L1 another output end.Common mode inductance L1 Neng Dui cities
Electricity carries out decompression conversion, and rectification-balancing circuitry can carry out shaping filter, and maintenance voltage balance and stability to the voltage of formation, open
Close power transformer T1 and coupling decompression further then carried out to the voltage of formation, form the voltage being suitable to needed for electric energy meter work,
Ensure the working stability of electric energy meter.
Liquid crystal display 4 passes through including chip of LCD N31, the power port VDD of the chip of LCD N31
The RC filter circuits of ground connection are connected with control unit 3, and chip of LCD N31 input/output terminal SDA, clock end SCL is direct
Input/output terminal LCD_SDA, clock end LCD_SCL with control unit are connected.Liquid crystal display 4 is according to control unit 3
Transmission information carries out corresponding data and shown, facilitates operator to read data.
In addition to above-mentioned improvement, other similar improvement are also contained in the improvement threshold of the present invention, are not just existed herein
Repeat.Although an embodiment of the present invention has been shown and described, it will be appreciated by those skilled in the art that：The present invention is not being departed from
Principle and objective in the case of can to these embodiments carry out it is a variety of change, modification, replace and deformation, the scope of the present invention
Limited by claim and its equivalent.
Claims (10)
- A kind of 1. modular electric energy meter, it is characterised in that：Each independent integrates multiple functional units of the electric energy meter；The functional unit realizes signal communication by inserting mode and electric energy meter pcb board (1) socket connection.
- 2. modular electric energy meter according to claim 1, it is characterised in that：The functional unit is modular structure, described The plug (62) outwardly to stretch out formed with groove (61), the interior setting of the groove (61) of modular structure, There is the inserting column (63) for coordinating grafting with the groove (61) on the pcb board (1), have on the inserting column (63) and supply plug (62) insert and contact the jack (64) of conducting with pcb board (1) suitable for plug (62).
- 3. modular electric energy meter according to claim 2, it is characterised in that：Jack (64) diameter is inserted along plug (62) Enter gradually increase after direction is first gradually reduced, corresponding be embedded with is easy to plug (62) end fully to be connect with pcb board (1) on pcb board (1) Touch the sheet metal (11) of conducting.
- 4. modular electric energy meter according to claim 2, it is characterised in that：Pcb board (1) surface, which is outwardly formed, to be suitable to The metallic channel (12) of plug (62), the inserting column (63) are located at the metallic channel (12) described in plug (62) insertion and firm clamping Periphery.
- 5. according to the modular electric energy meter any one of claim 2-4, it is characterised in that：The plug (63) is contact pin Structure or flake structure, the end of the contact pin or thin slice is in plane.
- 6. modular electric energy meter according to claim 5, it is characterised in that：The modular electric energy meter includes and pcb board (1) control unit (3), the basis that are worked for power subsystem (2), the control unit of unit power supply of socket connection The information that control unit (3) is transmitted carries out the liquid crystal display (4) that data show, civil power is converted into the carrier wave of operating voltage Unit (5).
- 7. modular electric energy meter according to claim 6, it is characterised in that：The carrier units (5) include conversion chip (J41), the conversion chip (J41) passes through the first divider resistance (R41), the second divider resistance (R42), the 3rd divider resistance (R43), the 4th divider resistance (R44) and receiving terminal (PLC_RXD), transmitting terminal (PLC_TXD), the reset terminal of control unit (PLC_RST), triggering end (PLC_EVENOUT) is corresponding connects, first divider resistance (R41), the second divider resistance (R42), the 3rd divider resistance (R43) is with being connected pull-up resistor between the corresponding ports of control unit, and the 4th divider resistance (R44) is even Connect pull down resistor.
- 8. modular electric energy meter according to claim 7, it is characterised in that：The power subsystem (2) includes being sequentially connected Common mode inductance (L1), rectification-balancing circuitry (Q), switching mode power supply transformer (T1), civil power is converted into operating voltage.
- 9. modular electric energy meter according to claim 8, it is characterised in that：Rectification-the balancing circuitry (Q) includes being used for The first diode (VD1) of rectification, the second diode (VD2) and for serve balanced voltage first resistor (R101), Two resistance (R102), 3rd resistor (R103), the 4th resistance (R014), the positive pole and common mode inductance of the first diode (VD1) (L1) output end connection, the negative pole of the first diode (VD1) connect the positive pole of the second diode (VD2), the two or two pole The negative pole of (VD2) is managed with being connected backend load after the first resistor (R101) being connected in series, second resistance (R102) parallel connection, is connected The first resistor (R101) of connection, the other end of second resistance (R102) and the 3rd resistor (R103) being connected in series, the 4th electricity Backend load is connected after resistance (R104) is in parallel, the 3rd resistor (R103) that is connected in series, the other end of the 4th resistance (R104) connect Connect another output end of common mode inductance (L1).
- 10. modular electric energy meter according to claim 9, it is characterised in that：The liquid crystal display (4) includes liquid crystal Display chip (N31), the RC filter circuits and control of the power port (VDD) of the chip of LCD (N31) by ground connection Unit connects, and the input/output terminal (SDA) of chip of LCD (N31), clock end (SCL) are directly defeated with the input of control unit Go out end (LCD_SDA), clock end (LCD_SCL) is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711040172.1A CN107727900A (en) | 2017-10-30 | 2017-10-30 | A kind of modular electric energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711040172.1A CN107727900A (en) | 2017-10-30 | 2017-10-30 | A kind of modular electric energy meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107727900A true CN107727900A (en) | 2018-02-23 |
Family
ID=61202904
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711040172.1A Pending CN107727900A (en) | 2017-10-30 | 2017-10-30 | A kind of modular electric energy meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107727900A (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05217934A (en) * | 1992-02-07 | 1993-08-27 | Kawasaki Steel Corp | Formation of contact hole |
| CN201075442Y (en) * | 2006-11-20 | 2008-06-18 | 耿诗涵 | Anti-electric shock safety plug and socket |
| CN101561299A (en) * | 2008-04-18 | 2009-10-21 | 湖北盛佳电器设备有限公司 | Modularized metering device |
| CN201392354Y (en) * | 2009-04-27 | 2010-01-27 | 湖北盛佳电器设备有限公司 | Electric energy metering device of modularized assembly |
| CN201608714U (en) * | 2009-12-01 | 2010-10-13 | 宁波三星电气股份有限公司 | Carrier communication circuit |
| CN103022767A (en) * | 2012-12-12 | 2013-04-03 | 高自然 | Improved plug and socket |
| CN203805461U (en) * | 2013-12-17 | 2014-09-03 | 当阳金三峡联通印务有限公司 | Gear locking device of roll paper gravure printing machine |
| CN104332764A (en) * | 2014-07-28 | 2015-02-04 | 中航光电科技股份有限公司 | Sheet-type contact piece and electric connector using same |
| CN104504129A (en) * | 2014-12-31 | 2015-04-08 | 潍坊五洲浩特电气有限公司 | Information inquiring terminal of household intelligent electric meter |
| CN204287318U (en) * | 2014-12-24 | 2015-04-22 | 嘉兴东鸿电子科技有限公司 | A kind of modular guide tracked Multifunctional single-phase electric energy meter |
| CN105006688A (en) * | 2015-08-14 | 2015-10-28 | 浙江法斯特电梯有限公司 | Anti-drop single-jack plug socket |
| CN207457318U (en) * | 2017-10-30 | 2018-06-05 | 宁波三星医疗电气股份有限公司 | A kind of modular electric energy meter |
-
2017
- 2017-10-30 CN CN201711040172.1A patent/CN107727900A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05217934A (en) * | 1992-02-07 | 1993-08-27 | Kawasaki Steel Corp | Formation of contact hole |
| CN201075442Y (en) * | 2006-11-20 | 2008-06-18 | 耿诗涵 | Anti-electric shock safety plug and socket |
| CN101561299A (en) * | 2008-04-18 | 2009-10-21 | 湖北盛佳电器设备有限公司 | Modularized metering device |
| CN201392354Y (en) * | 2009-04-27 | 2010-01-27 | 湖北盛佳电器设备有限公司 | Electric energy metering device of modularized assembly |
| CN201608714U (en) * | 2009-12-01 | 2010-10-13 | 宁波三星电气股份有限公司 | Carrier communication circuit |
| CN103022767A (en) * | 2012-12-12 | 2013-04-03 | 高自然 | Improved plug and socket |
| CN203805461U (en) * | 2013-12-17 | 2014-09-03 | 当阳金三峡联通印务有限公司 | Gear locking device of roll paper gravure printing machine |
| CN104332764A (en) * | 2014-07-28 | 2015-02-04 | 中航光电科技股份有限公司 | Sheet-type contact piece and electric connector using same |
| CN204287318U (en) * | 2014-12-24 | 2015-04-22 | 嘉兴东鸿电子科技有限公司 | A kind of modular guide tracked Multifunctional single-phase electric energy meter |
| CN104504129A (en) * | 2014-12-31 | 2015-04-08 | 潍坊五洲浩特电气有限公司 | Information inquiring terminal of household intelligent electric meter |
| CN105006688A (en) * | 2015-08-14 | 2015-10-28 | 浙江法斯特电梯有限公司 | Anti-drop single-jack plug socket |
| CN207457318U (en) * | 2017-10-30 | 2018-06-05 | 宁波三星医疗电气股份有限公司 | A kind of modular electric energy meter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103167691A (en) | Light emitting diode (LED) driving power supply and dimming system | |
| CN201716851U (en) | Special transformer collecting terminal provided with modularized communication module | |
| CN207457318U (en) | A kind of modular electric energy meter | |
| CN203278279U (en) | Multifunctional mobile power supply | |
| CN201583831U (en) | Shift series type digital display meter | |
| CN103954312A (en) | Data acquisition paperless recorder | |
| CN105954623A (en) | Modulation and testing system for universal frequency source type plugging element and testing method thereof | |
| CN206178004U (en) | Single -phase state net remote intelligent table printed circuit board | |
| CN107727900A (en) | A kind of modular electric energy meter | |
| CN201918941U (en) | Daughter circuit board for conversion of interface signals of electronic commutation motor | |
| CN208589619U (en) | It can be with the intelligent conversion socket of voice control | |
| CN202772864U (en) | Key and indicator light control circuit, and television | |
| CN210270872U (en) | Portable serial port detector | |
| CN208806787U (en) | A kind of telemetering terminal power supply circuit | |
| CN1174198C (en) | Network water heater | |
| CN201107618Y (en) | Digital type multifunctional touch controller | |
| CN202102033U (en) | Metering module having plug and play function | |
| CN205319950U (en) | Computer power supply | |
| CN201397351Y (en) | Modularized assembled electric power metering device | |
| CN204631125U (en) | A kind of three-phase LCD Multi-functional digital display electrical measuring meter | |
| CN201001108Y (en) | High voltage isolation electronic switch | |
| CN205486709U (en) | Multi -functional household power consumption information acquisition device | |
| CN203824565U (en) | Paperless data acquisition recorder | |
| CN109039352A (en) | A kind of telemetering terminal power supply circuit | |
| CN203643005U (en) | Frequency signal converter for ultrasonic flow meter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |