CN103604969A - Universal meter and control method thereof - Google Patents
Universal meter and control method thereof Download PDFInfo
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- CN103604969A CN103604969A CN201310527958.1A CN201310527958A CN103604969A CN 103604969 A CN103604969 A CN 103604969A CN 201310527958 A CN201310527958 A CN 201310527958A CN 103604969 A CN103604969 A CN 103604969A
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Abstract
The invention discloses a universal meter and a control method thereof. The universal meter includes a rechargeable meter pen, a main-control/communication meter pen and a cable which connects the rechargeable meter pen and the main-control/ communication meter pen. The main-control/ communication meter pen is in communication connection with an external terminal through a USB interface or wireless methods such as WIFI and the like so that repeated replacement of batteries is not needed and environment pollution caused by frequent replacement of the batteries is reduced. Therefore, the universal meter is economical and environment-friendly, capable of reducing the dimension of the universal meter substantially and convenient to carry; and the universal meter is capable of transmitting measurement data to a PC, a flat computer, a handset and a notebook computer in a real-time manner through WIFI so that more directly observable measurement results can be displayed; moreover, a dual-body combination structure is adopted and the tip of the meter pen can be hidden in combination so that a possibility of accidental injures of the tips of the prior universal meters is avoided.
Description
Technical field
The present invention relates to surveying instrument technical field, relate in particular to a kind of multimeter and control method thereof.
Background technology
Traditional multimeter conventionally employing table body adds the pattern of external test pencil, and it is inner that its battery is arranged on table body conventionally, causes equipment volume large, and battery needs constantly to change, and so neither environmental protection is also uneconomical.In addition, existing multimeter only comprises a LCDs and shows the most basic measurement result at apparatus body, data cannot be derived in real time, analyze and preserve.
Summary of the invention
The object of the present invention is to provide a kind of volume little, avoid frequently changing battery and can be by external multimeter and the control method thereof of output intuitively to show of measurement result.
In order to achieve the above object, the present invention proposes a kind of multimeter, comprising: a chargeable test pencil, master control/communication test pencil and connect described chargeable test pencil and the cable of the master control/test pencil of communicating by letter; Described master control/communication test pencil communicates to connect by USB interface or wireless mode and exterior terminal.
Preferably, described wireless mode is at least WIFI; Described exterior terminal is at least PC, panel computer, mobile phone, notebook computer.
Preferably, described chargeable test pencil comprises: the first test pencil housing, be arranged on rechargeable battery, first circuit board, the first connector in described the first test pencil housing, and detachable the first test pencil head that is arranged on described the first test pencil housing front end, wherein:
Described rechargeable battery, the first connector and the first test pencil head are electrically connected to described first circuit board respectively;
Described cable is connected to the tail end of described the first test pencil housing and is electrically connected to described the first connector.
Preferably, described master control/communication test pencil comprises the second test pencil housing, is arranged on second circuit board, the second connector, the 3rd connector in described the second test pencil housing, and detachable the second test pencil head that is arranged on described the second test pencil housing front end, wherein:
Described the second connector, the 3rd connector and the second test pencil head are electrically connected to described second circuit board respectively;
Described cable is connected to the tail end of described the second test pencil housing and is electrically connected to described the second connector;
Described the second connector is provided with USB interface, by usb data line and described exterior terminal, communicates to connect.
Preferably, described master control/communication test pencil also comprises that described reset key is arranged on a side of described the second test pencil head for opening or close the reset key of multimeter, and coordinates installation with described the second test pencil housing; Described reset key is electrically connected to described second circuit board.
Preferably, described chargeable test pencil is L-type with the master control/test pencil of communicating by letter, and both form binary fabricated structure after being fastened and connected, and hides the test pencil of test pencil head is separately most advanced and sophisticated; The volume of described binary fabricated structure is less than 105mm*34mm*13.5mm.
Preferably, the integrated circuit on described second circuit board comprises: front-end protection circuit, signal sample circuit, communication control circuit and electric power management circuit, wherein:
Described electric power management circuit is electrically connected to described front-end protection circuit, signal sample circuit and communication control circuit respectively, for providing power supply to described front-end protection circuit, signal sample circuit and communication control circuit;
Described signal sample circuit is electrically connected to described communication control circuit, for gathering measured point signal, and described measured point signal is sent to described communication control circuit;
Described communication control circuit communicates to connect by USB interface and the exterior terminal of wireless mode or described the second connector, for described measured point signal is sent to described exterior terminal.
Preferably, the electric discharge of the rechargeable battery recharge of described chargeable test pencil is more than 300 times; The traffic rate of described master control/communication test pencil and exterior terminal at least comprises 1Mbps, 11Mbps, 24Mbps, 54Mbps, and automatically according to data volume, adjusts speed; Support open, WEP, WPA, WPA2 under 2.4GHz frequency to encrypt WIFI communication.
The present invention also proposes a kind of control method of multimeter, and described multimeter comprises: chargeable test pencil, master control/communication test pencil and connect described chargeable test pencil and the cable of the master control/test pencil of communicating by letter; The method comprises the following steps:
After chargeable test pencil being connected with master control/communication test pencil when connection cable, press reset key, opening power is supplied with, and now multimeter starts;
After multimeter starts, master control/communication test pencil of multimeter is searched for attachable exterior terminal;
After searching attachable exterior terminal, described multimeter mates with exterior terminal, and after the match is successful, multimeter is by described master control/communication test pencil and exterior terminal is set up TCP or UDP communicates to connect;
When exterior terminal, according to user's operational order, select after measurement function, described multimeter receives by master control/communication test pencil the measurement code that described exterior terminal is sent;
Described master control/communication test pencil is carried out measurement function according to the measurement code obtaining in conjunction with described chargeable test pencil, and gives described exterior terminal by measurement feedback, by described exterior terminal, the measurement result of obtaining is analyzed, is shown.
Preferably, the method also comprises:
When described exterior terminal receives after the operational order of closing described measurement function of user on operation interface, stop sending and measuring code to master control/communication test pencil of described multimeter; Or
When described exterior terminal receives after the power-off operation instruction of user on operation interface, to master control/communication test pencil transmission shutdown code of described multimeter.
A kind of multimeter and control method thereof that the present invention proposes, this multimeter comprises chargeable test pencil, master control/communication test pencil and connects chargeable test pencil and the cable of the master control/test pencil of communicating by letter; Master control/communication test pencil can communicate to connect by the wireless modes such as USB interface or WIFI and exterior terminal, battery be can repeat to change thus, frequent the change environmental pollution that battery causes, economic environmental protection reduced, but also can significantly dwindle multimeter volume, easy to carry; And measurement data can be passed through to WIFI real-time Transmission to PC, panel computer, mobile phone, notebook computer, embody more intuitive measurement result; In addition, adopt binary fabricated structure, during combination, can hide test pencil tip, avoid the accidental injury possibility at existing multimeter tip.
Accompanying drawing explanation
Fig. 1 is the structural representation of multimeter preferred embodiment of the present invention;
Fig. 2 is the schematic perspective view after the chargeable test pencil of the multimeter shown in Fig. 1 fastens with the master control/test pencil of communicating by letter;
Fig. 3 is the STRUCTURE DECOMPOSITION schematic diagram of the chargeable test pencil shown in Fig. 1;
Fig. 4 is the STRUCTURE DECOMPOSITION schematic diagram of the master control/communication test pencil shown in Fig. 1;
Fig. 5 is the schematic block circuit diagram of the master control/communication test pencil shown in Fig. 4;
Fig. 6 is a kind of principle of work schematic diagram of multimeter of the present invention;
Fig. 7 is the schematic flow sheet of the control method preferred embodiment of multimeter of the present invention.
In order to make technical scheme of the present invention clearer, clear, below in conjunction with accompanying drawing, be described in further detail.
Embodiment
Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
As shown in Figure 1, Fig. 1 is the structural representation of multimeter preferred embodiment of the present invention.The embodiment of the present invention proposes a kind of multimeter, comprising: a chargeable test pencil A, master control/communication test pencil B and connect described chargeable test pencil A and the cable C of the master control/test pencil B that communicates by letter; Described master control/communication test pencil B communicates to connect by USB interface or wireless mode and exterior terminal.
Wherein, described wireless mode can be WIFI, bluetooth etc.; Described exterior terminal can be PC, panel computer, mobile phone, notebook computer, and corresponding software is externally installed in terminal.
Take WIFI as example, and the traffic rate of described master control/communication test pencil B and exterior terminal can be 1Mbps, 11Mbps, 24Mbps, 54Mbps, and automatically according to data volume, adjusts speed; In addition, the present embodiment multimeter also supports open, WEP, WPA, WPA2 under 2.4GHz frequency to encrypt WIFI communication.
Particularly, as shown in Figure 2, the chargeable test pencil A of the present embodiment multimeter is L-type with the master control/test pencil B that communicates by letter, and both form binary fabricated structure after being fastened and connected, hide the test pencil of test pencil head is separately most advanced and sophisticated, can avoid thus the accidental injury at existing multimeter tip may;
In addition, the volume of described binary fabricated structure is less than 105mm*34mm*13.5mm, as a kind of embodiment, this binary fabricated structure can be rectangular parallelepiped, the size of this rectangular parallelepiped is as follows: length is less than or equal to 105mm, width is less than or equal to 34mm, highly be less than or equal to 13.5mm, can significantly dwindle multimeter volume thus, make multimeter easy to carry.
More specifically, as shown in Figure 3, described chargeable test pencil A comprises: the first test pencil housing 5, be arranged on rechargeable battery 2, first circuit board 3, the first connector 4 in described the first test pencil housing 5, and detachable the first test pencil head 1 that is arranged on described the first test pencil housing 5 front ends, wherein:
Described rechargeable battery 2, the first connector 4 and the first test pencil head 1 are electrically connected to described first circuit board 3 respectively;
One end 6 of described cable C is connected to the tail end of described the first test pencil housing 5 and is electrically connected to described the first connector 4.
The rechargeable battery 2 recharge electric discharges of described chargeable test pencil A more than 300 times, can repeat to change battery thus, reduce frequent the change environmental pollution that battery causes, economic environmental protection.
As shown in Figure 4, described master control/communication test pencil B comprises the second test pencil housing 70, be arranged on second circuit board 40, the second connector 60, the 3rd connector 50 in described the second test pencil housing 70, and detachable the second test pencil head 20 that is arranged on described the second test pencil housing 70 front ends, wherein:
Described the second connector 60, the 3rd connector 50 and the second test pencil head 20 are electrically connected to described second circuit board 40 respectively;
The other end 8 of described cable C is connected to the tail end of described the second test pencil housing 70 and is electrically connected to described the second connector 60;
Described the second connector 60 is provided with USB interface, by usb data line and described exterior terminal, communicates to connect.
Described master control/communication test pencil B also comprises that described reset key 30 is arranged on a side of described the second test pencil head 20 for opening or close the reset key 30 of multimeter, and coordinates installation with described the second test pencil housing 70; Described reset key 30 is electrically connected to described second circuit board 40.
The assembling process of the present embodiment multimeter is as follows:
First assemble chargeable test pencil A and master control/test pencil B communicates by letter;
For the assembling of chargeable test pencil A, first, the first connector 4 is soldered to first circuit board 3, rechargeable battery 2 is soldered to first circuit board 3;
Then, the assembly of rechargeable battery 2, the first connector 4 and first circuit board 3 is inserted in the first test pencil housing 5;
Afterwards, the front end that the first test pencil head 1 that the first test pencil tip 7 is housed is packed into the first test pencil housing 5;
Then, one end of cable C 6 is inserted to the afterbody of the first test pencil housing 5, be electrically connected to the first connector 4.
Thus, complete the assembling of chargeable test pencil A.
For the assembling of master control/communication test pencil B, first, the second connector 60 is soldered to second circuit board 40;
By reset key 30 and the second test pencil housing 70 combinations;
Then, the assembly of the second connector 60, the 3rd connector 50 and second circuit board 40 is inserted in the second test pencil housing 70;
Afterwards, pack the second test pencil head 20 that the second test pencil tip 70 is housed the front end of the second test pencil housing 70 into, and make reset key 30 be connected to the side of the second test pencil head 20, be electrically connected to second circuit board 40;
Then, the other end of cable C 8 is inserted to the afterbody of the second test pencil housing 70, be electrically connected to the second connector 60.
Thus, complete the assembling of master control/communication test pencil B, and by cable C, chargeable test pencil A is combined as to complete multimeter with the master control/test pencil B that communicates by letter.
As shown in Figure 5; in master control/communication test pencil B of the present embodiment multimeter, on second circuit board 40, be integrated with following functional circuit; this functional circuit comprises: front-end protection circuit 201, signal sample circuit 202, communication control circuit 203 and electric power management circuit 204, wherein:
Described electric power management circuit 204 is electrically connected to described front-end protection circuit 201, signal sample circuit 202 and communication control circuit 203 respectively, for providing power supply to described front-end protection circuit 201, signal sample circuit 202 and communication control circuit 203;
Described signal sample circuit 202 is electrically connected to described communication control circuit 203, for gathering measured point signal, and described measured point signal is sent to described communication control circuit 203;
Described communication control circuit 203 communicates to connect by USB interface and the exterior terminal of wireless mode or described the second connector 60, for described measured point signal is sent to described exterior terminal.
The circuit theory following (communicate by letter and give an example by WIFI with handheld terminal with multimeter) of the multimeter of the present embodiment:
1, after multimeter is connected according to Fig. 1, electric power management circuit 204 is in off-mode, by pressing reset key " M " key is multimeter device power-up;
2, electric power management circuit 204 is to communication control circuit 203 power supplies, equipment starts to search for attachable handheld terminal (mobile phone, panel computer etc.), continuous search schedule time such as 30 seconds after, as searched not yet attachable handheld terminal, electric power management circuit 204 cuts off communication control circuit 203 power supplys voluntarily, and equipment recovers off-mode;
3, when multimeter searches after attachable handheld terminal, the software of being installed by handheld terminal, completes mating of multimeter and handheld terminal, and sets up TCP or UDP communication;
4, the selected a kind of measurement function of handheld terminal, and by WIFI, measurement code is sent to multimeter, the communication control circuit 203 of multimeter will be carried out measurement function, and electric power management circuit 204 is to signal sample circuit 202 out-put supplies, until measurement result is returned to communication control circuit 203;
5, communication control circuit 203 is sent to handheld terminal by measurement result, by the software on handheld terminal, carries out data processing, analysis, drawing, demonstration;
6, click this kind of measurement function button of closing of handheld terminal software interface, handheld terminal will stop being sent and measuring code to multimeter by WIFI;
7, click handheld terminal software interface " shutdown " and button, handheld terminal will send shutdown code to multimeter by WIFI, after communication control circuit 203 decodings, be closed the action of complete machine power supply by electric power management circuit 204 execution;
In addition, if do not carry out the operation of above-mentioned steps 7, but by pressing in multimeter open state length " M " key, electric power management circuit 204 will directly be carried out power-off operation.
The present embodiment multimeter operational flow diagram, in detail as shown in Figure 6.
When using multimeter, its specific operation process is as follows:
1, the upper computer software on exterior terminal is opened.
2, by multimeter by fit state, taking apart is two test pencils: chargeable test pencil A and the master control/test pencil B that communicates by letter, connect two test pencils with connection cable C.
3, can reset key 30 by master control/communication test pencil B inner side, multimeter is started shooting.
4, wait for upper computer software interface display: multimeter connects.
5, at upper computer selecting measurement function, as resistance, DC voltage etc.
6, the test pencil tip of chargeable test pencil A is placed in to measured signal source initiating terminal, end is finished to as for measured signal source in the test pencil tip of master control/communication test pencil B.
7, observe result, waveform and the data analysis of upper computer software interface display.
8 press " M " key, close multimeter, host computer interface display: multimeter disconnects.
The performance parameter of the present embodiment multimeter is as shown in table 1 below:
Table 1
The present embodiment passes through such scheme, master control/communication test pencil B can communicate to connect by the wireless modes such as USB interface or WIFI and exterior terminal, can repeat to change thus battery, reduce the frequent environmental pollution that battery causes of changing, economic environmental protection, but also can significantly dwindle multimeter volume, easy to carry; And measurement data can be passed through to WIFI real-time Transmission to PC, panel computer, mobile phone, notebook computer, embody more intuitive measurement result; In addition, adopt binary fabricated structure, during combination, can hide test pencil tip, avoid the accidental injury possibility at existing multimeter tip.
As shown in Figure 7, preferred embodiment of the present invention proposes a kind of control method of multimeter, the multimeter of the method based on described in above-described embodiment and implementing, so this multimeter can comprise: chargeable test pencil, master control/communication test pencil and connect described chargeable test pencil and the cable of the master control/test pencil of communicating by letter; Particularly, the method comprises:
Step S101, after multimeter starts, master control/communication test pencil of multimeter is searched for attachable exterior terminal;
After chargeable test pencil being connected with master control/communication test pencil when stube cable, press reset key, opening power is supplied with, and now multimeter starts.
Step S102, after searching attachable exterior terminal, described multimeter mates with exterior terminal, and after the match is successful, multimeter is by described master control/communication test pencil and exterior terminal is set up TCP or UDP communicates to connect;
Step S103, selectes after measurement function according to user's operational order when exterior terminal, and described multimeter receives by master control/communication test pencil the measurement code that described exterior terminal is sent;
Step S104, master control/communication test pencil is carried out measurement function according to the measurement code obtaining in conjunction with described chargeable test pencil, and gives described exterior terminal by measurement feedback, by described exterior terminal, the measurement result of obtaining is analyzed, is shown.
Follow-up, when described exterior terminal receives after the operational order of closing described measurement function of user on operation interface, exterior terminal stops sending and measuring code to master control/communication test pencil of described multimeter.
In addition,, when described exterior terminal receives after the power-off operation instruction of user on operation interface, exterior terminal sends shutdown code to master control/communication test pencil of multimeter.
The detailed operation principle that the present embodiment multimeter and exterior terminal are mutual, please refer to above-described embodiment, does not repeat them here.
Embodiment of the present invention multimeter and control method thereof, this multimeter comprises chargeable test pencil, master control/communication test pencil and connects chargeable test pencil and the cable of the master control/test pencil of communicating by letter; Master control/communication test pencil can communicate to connect by the wireless modes such as USB interface or WIFI and exterior terminal, battery be can repeat to change thus, frequent the change environmental pollution that battery causes, economic environmental protection reduced, but also can significantly dwindle multimeter volume, easy to carry; And measurement data can be passed through to WIFI real-time Transmission to PC, panel computer, mobile phone, notebook computer, embody more intuitive measurement result; In addition, adopt binary fabricated structure, during combination, can hide test pencil tip, avoid the accidental injury possibility at existing multimeter tip.
Above are only the preferred embodiments of the present invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or flow process conversion that utilizes instructions of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical field, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. a multimeter, is characterized in that, comprising: a chargeable test pencil, master control/communication test pencil and connect described chargeable test pencil and the cable of the master control/test pencil of communicating by letter; Described master control/communication test pencil communicates to connect by USB interface or wireless mode and exterior terminal.
2. multimeter according to claim 1, is characterized in that, described wireless mode is at least WIFI; Described exterior terminal is at least PC, panel computer, mobile phone, notebook computer.
3. multimeter according to claim 2, it is characterized in that, described chargeable test pencil comprises: the first test pencil housing, be arranged on rechargeable battery, first circuit board, the first connector in described the first test pencil housing, and detachable the first test pencil head that is arranged on described the first test pencil housing front end, wherein:
Described rechargeable battery, the first connector and the first test pencil head are electrically connected to described first circuit board respectively;
Described cable is connected to the tail end of described the first test pencil housing and is electrically connected to described the first connector.
4. multimeter according to claim 2, it is characterized in that, described master control/communication test pencil comprises the second test pencil housing, be arranged on second circuit board, the second connector, the 3rd connector in described the second test pencil housing, and detachable the second test pencil head that is arranged on described the second test pencil housing front end, wherein:
Described the second connector, the 3rd connector and the second test pencil head are electrically connected to described second circuit board respectively;
Described cable is connected to the tail end of described the second test pencil housing and is electrically connected to described the second connector;
Described the second connector is provided with USB interface, by usb data line and described exterior terminal, communicates to connect.
5. multimeter according to claim 4, it is characterized in that, described master control/communication test pencil also comprises that described reset key is arranged on a side of described the second test pencil head for opening or close the reset key of multimeter, and coordinates installation with described the second test pencil housing; Described reset key is electrically connected to described second circuit board.
6. according to the multimeter described in any one in claim 1-5, it is characterized in that, described chargeable test pencil is L-type with the master control/test pencil of communicating by letter, and both form binary fabricated structure after being fastened and connected, and hides the test pencil of test pencil head is separately most advanced and sophisticated; The volume of described binary fabricated structure is less than 105mm*34mm*13.5mm.
7. multimeter according to claim 4, is characterized in that, the integrated circuit on described second circuit board comprises: front-end protection circuit, signal sample circuit, communication control circuit and electric power management circuit, wherein:
Described electric power management circuit is electrically connected to described front-end protection circuit, signal sample circuit and communication control circuit respectively, for providing power supply to described front-end protection circuit, signal sample circuit and communication control circuit;
Described signal sample circuit is electrically connected to described communication control circuit, for gathering measured point signal, and described measured point signal is sent to described communication control circuit;
Described communication control circuit communicates to connect by USB interface and the exterior terminal of wireless mode or described the second connector, for described measured point signal is sent to described exterior terminal.
8. multimeter according to claim 3, is characterized in that, the rechargeable battery recharge electric discharge of described chargeable test pencil is more than 300 times; The traffic rate of described master control/communication test pencil and exterior terminal at least comprises 1Mbps, 11Mbps, 24Mbps, 54Mbps, and automatically according to data volume, adjusts speed; Support open, WEP, WPA, WPA2 under 2.4GHz frequency to encrypt WIFI communication.
9. a control method for multimeter, is characterized in that, described multimeter comprises: chargeable test pencil, master control/communication test pencil and connect described chargeable test pencil and the cable of the master control/test pencil of communicating by letter; The method comprises the following steps:
After chargeable test pencil being connected with master control/communication test pencil when connection cable, press reset key, opening power is supplied with, and now multimeter starts;
After chargeable test pencil being connected with master control/communication test pencil when stube cable, press reset key, opening power is supplied with, and now multimeter startup is worked as, and after multimeter starts, master control/communication test pencil of multimeter is searched for attachable exterior terminal;
After searching attachable exterior terminal, described multimeter mates with exterior terminal, and after the match is successful, multimeter is by described master control/communication test pencil and exterior terminal is set up TCP or UDP communicates to connect;
When exterior terminal, according to user's operational order, select after measurement function, described multimeter receives by master control/communication test pencil the measurement code that described exterior terminal is sent;
Described master control/communication test pencil is carried out measurement function according to the measurement code obtaining in conjunction with described chargeable test pencil, and gives described exterior terminal by measurement feedback, by described exterior terminal, the measurement result of obtaining is analyzed, is shown.
10. the control method of multimeter according to claim 9, is characterized in that, also comprises:
When described exterior terminal receives after the operational order of closing described measurement function of user on operation interface, stop sending and measuring code to master control/communication test pencil of described multimeter; Or
When described exterior terminal receives after the power-off operation instruction of user on operation interface, to master control/communication test pencil transmission shutdown code of described multimeter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310527958.1A CN103604969A (en) | 2013-10-31 | 2013-10-31 | Universal meter and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310527958.1A CN103604969A (en) | 2013-10-31 | 2013-10-31 | Universal meter and control method thereof |
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| CN103604969A true CN103604969A (en) | 2014-02-26 |
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| CN201310527958.1A Pending CN103604969A (en) | 2013-10-31 | 2013-10-31 | Universal meter and control method thereof |
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| CN104833832A (en) * | 2015-05-16 | 2015-08-12 | 苏州致广电子有限公司 | Wireless multimeter |
| CN104931757A (en) * | 2015-05-05 | 2015-09-23 | 武汉振道世纪科技有限公司 | Electrombile intelligent charging measurement and control universal meter |
| CN108732402A (en) * | 2018-07-16 | 2018-11-02 | 上海理工大学 | intelligent meter pen type multimeter |
| CN113655271A (en) * | 2021-08-17 | 2021-11-16 | 广东电网有限责任公司 | Portable universal meter with wireless transmission function |
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| CN113655271A (en) * | 2021-08-17 | 2021-11-16 | 广东电网有限责任公司 | Portable universal meter with wireless transmission function |
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Application publication date: 20140226 |