CN109633231A - A kind of adaptive range circuit of ammeter, ammeter and the adaptive range switching method of ammeter - Google Patents
A kind of adaptive range circuit of ammeter, ammeter and the adaptive range switching method of ammeter Download PDFInfo
- Publication number
- CN109633231A CN109633231A CN201811639399.2A CN201811639399A CN109633231A CN 109633231 A CN109633231 A CN 109633231A CN 201811639399 A CN201811639399 A CN 201811639399A CN 109633231 A CN109633231 A CN 109633231A
- Authority
- CN
- China
- Prior art keywords
- ammeter
- pin
- range
- circuit
- connects
- 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
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/08—Circuits for altering the measuring range
- G01R15/09—Autoranging circuits
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
Abstract
The present invention discloses a kind of adaptive range switch circuit of ammeter, comprising: comparison circuit obtains comparison result for the measured value of ammeter to be compared with the range value of ammeter；Range swithching circuit, result controls the on-off in the multiple range circuits in parallel with the ammeter based on the comparison.The present invention can be realized the adaptive range switching of ammeter.
Description
Technical field
The present invention relates to ammeter technical field, more particularly to a kind of adaptive range circuit of ammeter, ammeter with
And the adaptive range switching method of ammeter.
Background technique
Ammeter is a kind of instrument for measuring electric current, and ammeter is divided into traditional electromagnetic induction indicator type current meter and number
Formula ammeter, in terms of traditional electromagnetic induction indicator type current meter is used primarily in school instruction, the reading ability of exercise student ', number
In terms of word formula ammeter is used primarily in measuring study, uses and not only facilitate, but also have the advantages that precision is higher.
Currently, conventional digital formula ammeter needs manual switching range when measuring electric current, it is not only inconvenient, but also require
There are very big inconveniences no more than the range, when application for the measured value of ammeter, and existing multi gear indicator type current meter is by more
A gauge outfit composition, volume is larger, is unfavorable for minimizing.
It is, therefore, desirable to provide a kind of adaptive range circuit of ammeter, ammeter and electricity for capableing of automatic switching range
The adaptive range method of flow table.
Summary of the invention
In order to achieve the above objectives, first aspect present invention proposes a kind of adaptive range switch circuit of ammeter, comprising:
Comparison circuit obtains comparison result for the measured value of ammeter to be compared with the range value of ammeter；
Range swithching circuit, result controls the logical of the multiple range circuits in parallel with the ammeter based on the comparison
It is disconnected.
Preferably, the comparison circuit includes:
The comparator of model LM393, the measurement output end of pin 2 and pin 5 the connection ammeter of the comparator,
The pin 7 of the comparator connects the range swithching circuit.
Preferably, the range swithching circuit includes:
The pin 4 of the impulse generator of model 7555, the impulse generator connects the pin 7 of the comparator；
The pin 14 of the pulse counter of model CD4017, the pulse counter connects drawing for the impulse generator
Foot 3, the pulse output pin of the pulse counter connect the output end in the range circuit.
Preferably, further includes:
The pin 5 of the logic unit of model CD4011, the logic unit connects the pin 4 of the comparator, described
The pin 6 of logic unit connects the pulse output pin of the pulse counter, and the pin 4 of the logic unit is separately connected institute
The pin 1 and pin 2 of logic unit are stated, the pin 3 of the logic unit connects the erasing pin of the pulse counter.
Preferably, further includes:
Power circuit, the power output end of the power circuit respectively with the comparison circuit, range swithching circuit and
The power input of logic unit connects.
Second aspect of the present invention proposes a kind of ammeter, comprising:
Shell；And
The adaptive range switch circuit of the ammeter；
Wherein, the ammeter both ends are connected in parallel with multiple range circuits, so that the ammeter has multiple amounts
Journey value.
Preferably, it is provided with manual switch on the shell, for described in the manual touch in response to operator and control
Logic unit works.
Preferably, display screen is provided on the shell.
Preferably, range indicator light is provided on the shell.
Third aspect present invention proposes a kind of adaptive range switching method of ammeter, comprising the following steps:
The measured value of ammeter is compared with the range value of ammeter, obtains comparison result；
Result switches over the range value of ammeter based on the comparison.
Beneficial effects of the present invention are as follows:
Technical solutions according to the invention have the advantages that definite principle, design are simple, and staff when in use, compares
The range value of the measured value of ammeter and ammeter can be compared to obtain comparison result automatically by circuit, and range swithching
Circuit can then control the on-off in the multiple range circuits in parallel with the ammeter based on comparative result, to realize electric current
The adaptive range of table switches purpose, and structure is simple and increases the ease of use and adaptability of ammeter.
Detailed description of the invention
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing.
Fig. 1 shows a kind of structural frames of the adaptive range switch circuit of ammeter of one embodiment of the present of invention proposition
Figure；
Fig. 2 shows the circuit diagrams of comparator and logic unit；
Fig. 3 shows the circuit diagram of impulse generator；
Fig. 4 shows the circuit diagram of pulse counter and range circuit；
Fig. 5 shows the circuit diagram of power circuit；
Fig. 6 shows a kind of structural schematic diagram of ammeter of another embodiment of the invention proposition；
Fig. 7 shows a kind of process for the adaptive range switching method of ammeter that another embodiment of the invention proposes
Figure.
In figure: 100, shell；110, manual switch；120, display screen；130, range indicator light.
Specific embodiment
In order to illustrate more clearly of the present invention, the present invention is done further below with reference to preferred embodiments and drawings
It is bright.Similar component is indicated in attached drawing with identical appended drawing reference.It will be appreciated by those skilled in the art that institute is specific below
The content of description is illustrative and be not restrictive, and should not be limited the scope of the invention with this.
Fig. 1 shows a kind of structural frames of the adaptive range switch circuit of ammeter of one embodiment of the present of invention proposition
Figure, as shown in Figure 1, mainly including comparison circuit and the range swithching circuit being electrically connected with comparison circuit, wherein comparison circuit
It is mainly used for being compared to the range value of the measured value of ammeter and ammeter to obtain comparison result, and range swithching circuit
Then result controls the on-off in multiple range circuits in parallel with the ammeter both ends based on the comparison, it should be noted that
Ammeter is connected in parallel with multiple range circuits, so that the ammeter can have multiple range values, that is to say, that multiple
Range circuit is parallel to the both ends of ammeter respectively, and when ammeter switching range value, and ammeter can be with the amount that currently connect
Range loop turns off, and is again connected to another range circuit, to achieve the purpose that switching range value.
Fig. 2 is the circuit diagram of comparison circuit, specifically, comparison circuit includes: the ratio for the model LM393 that can be sold in the market
Compared with device, the pin 1 of the comparator be separately connected the 14th resistance R14 first end and the 14th diode D14 first
End, the first end of the second end connection thirteenth resistor R13 of the 14th diode D14, the second termination of thirteenth resistor R13
Ground, the pin 2 of the comparator connect the measurement output end of ammeter, and the pin 3 of the comparator is separately connected the 14th electricity
It hinders the second end of R14 and the first end of the 18th resistance R18, the pin 4 of the comparator is separately connected the 18th resistance R18
Second end and ground connection, the pin 5 of the comparator connect the measurement output end of ammeter, the pin 6 of the comparator connects
The 17th rheostat R17, the 17th rheostatic second end ground connection are met, the pin 7 of the comparator is separately connected the range
The second end of the first end of conversion circuit and the 16th rheostat R16, the 16th rheostat R16 connects the 17th resistance R17
First end, the pin 8 of the comparator is separately connected the 16th rheostatic second end and power input.
Fig. 3 shows a part of the range swithching circuit according to the present embodiment, and another part is shown in FIG. 4, and Fig. 4 is
Range swithching circuit and circuit diagram including the range circuit in the present embodiment.
Specifically, range swithching circuit includes: the impulse generator and in the market for the model 7555 that can be sold in the market
The pulse counter (as shown in Figure 4) for the model CD4017 that can be sold, wherein the pin 1 of impulse generator is grounded, pulse generation
The pin 2 of device is separately connected the first end of first capacitor C1 and the pin 6 of impulse generator, and the pin 3 of impulse generator connects
The pin 14 of pulse counter is connect, the pin 4 of impulse generator connects the pin 7 of comparator, and the pin 6 of impulse generator connects
The first end of 7th resistance R7, the pin 7 of impulse generator connect the second end of the 7th resistance R7, the pin 8 of impulse generator
The 5th resistance R5 first end is connected, the second end of the 5th resistance R5 connects the first end of the 7th resistance R7；And pulse counter
Pin 8 is grounded, and the pin 14 of pulse counter connects the pin 3 of the impulse generator, and the pulse output of pulse counter is drawn
Foot connect range circuit output end, in the specific example of Fig. 3, the pulse output pin of pulse counter be respectively pin 1,
Pin 2, pin 4, pin 7 and pin 10.
Further, range circuit includes: MOS switch chip and the range resistance that connect with the MOS switch chip,
Wherein, in the specific example of Fig. 4, the quantity of MOS switch chip is two, the BSO220 that model can be sold in the market, is needed
To illustrate that the quantity of MOS switch chip can be set according to the demand of staff, wherein the first MOS switch chip
Pin 1, pin 2 and the pin 3 of MOSFET1 be separately connected the second end of the second diode D2, eleventh resistor R11 first
The pin 2 of end and pulse counter, the second end of eleventh resistor R11 connect the first end of the 6th light emitting diode D6, the
The pin 4 of one MOS switch chip SEFT1 is separately connected the first end of the tenth resistance R10, the second end of the 6th light emitting diode D6
And the pin 4 of pulse counter, the second end of the tenth resistance R10 connect the first end of the 5th light emitting diode D5, the 5th hair
The pin 4 of the second end connection pulse counter of optical diode D5, the pin 1 of the second MOS switch chip MOSFET2, pin 2 with
And pin 3 is separately connected the second end, the 9th first end of resistance R9 and drawing for pulse counter of the 5th light emitting diode D5
Foot 7, the second end of the 9th resistance R9 connect the first end of the 4th light emitting diode D4, the second end point of the 4th light emitting diode D4
Not Lian Jie the pin 7 of pulse counter, the second end of the 7th diode D7, the second end of the 8th diode D8 and ground connection,
The pin 1 of the first end connection pulse counter of seven diode D7 and the pin 13 of pulse counter, the 8th diode D8's
First end connects the pin 10 of pulse counter, and the pin 4 of the second MOS switch chip MOSFET2 is separately connected the 9th resistance R9
Second end, the first end of the 6th resistance R6, the first end of the 8th resistance R8, the second end of the 4th light emitting diode D4 and
The second end of eight diode D8, the second end of the 6th resistance R6 are separately connected the second end of third light emitting diode D3 and connect
Ground, the first end of third light emitting diode D3 connect the second end of the 8th resistance R8, and the first end of the 8th resistance R8 connects third
The second end of light emitting diode D3, the of pin 5 and pin 6 connection the second resistance R2 of the first MOS switch chip MOSFET1
One end, the second end of the second end connection 3rd resistor R3 of second resistance R2, the pin 7 of the first MOS switch chip MOSFET1 with
And pin 8 connects the first end of 3rd resistor R3, the second end of 3rd resistor R3 is separately connected the measurement output end (figure of ammeter
The end IN in 4), the second end (pin 2 of the CON2 in figure) of ammeter, the first end of the second diode D2 and the one or two pole
The second end of pipe D1, the first end of first diode D1 connect the second end of the second diode D2 and the first end of ammeter
(pin 1 of the CON2 in Fig. 4), the second end of first diode D1 are separately connected the measurement output end (IN in Fig. 4 of ammeter
End) and ammeter second end (pin 2 of the CON2 in figure), the pin 5 of the second MOS switch chip MOSFET2 and draw
Foot 6 connects the first end of first resistor R1, the measurement output end (IN in Fig. 4 of the second end connection ammeter of first resistor R1
End), the pin 7 and pin 8 of the second MOS switch chip MOSFET2 connect the first end of the 4th resistance R4, the 4th resistance R4's
Second end connects the measurement output end (end IN in Fig. 4) of ammeter, and the pin 1 of the first MOS switch chip MOSFET2, draws
Foot 2, pin 3, the pin 1 of pin 4 and the second MOS switch chip MOSFET2, pin 2, pin 3, pin 4 connect ammeter
First end.
The present embodiment is described further below with reference to practical application scene, specifically, when the present embodiment is worked
The range value of the measured value of the ammeter of input and ammeter can be compared by Cheng Zhong, comparator, and work as measured value not
When more than range value, ammeter can export low level to range swithching circuit, and range swithching circuit will not open work, and when survey
Magnitude is gradually increased to when being more than range value, and comparator can export high level to impulse generator, and impulse generator receives high electricity
Pulse train can be generated after flat, and each pulse can successively be such that each pulse output pin of pulse counter is sequentially generated
High level, and high level caused by each pulse output pin can drive volume range loop access so that ammeter is cut
New range value is shifted to, until the range value of ammeter is greater than measured value, at this moment, impulse generator will stop working, thus
Achieve the purpose that switch the adaptive range of ammeter, has improved the adaptability of the convenience and ammeter that use, circuit
Structure is simple, and entire circuit can be realized by using analog circuit, and it is easy in microwave measurement environment to avoid digital circuit
The problem of by High-frequency Interference, staff can also carry out Range Extension to ammeter according to self-demand, improve general
Property.
But when the range value of ammeter is larger, and measured value is smaller.Staff pass through electric current meter reading when,
May there is a problem of that deviation is larger, therefore, in order to solve this problem, in a preferred embodiment of the present embodiment
In, the circuit includes reset circuit, wherein the reset circuit includes the logic list for the model CD4011 that can be sold in the market
Member.
It is back to Fig. 2, in the specific example of Fig. 2, the logic unit of model CD4011 is defeated by four independent two
Enter end and NAND gate is constituted, logic function are as follows: when input terminal all " 1 ", export as " 0 "；When as long as input terminal has " 0 "
When, it exports as " 1 "；It when two input terminals are all " 0 ", exports as " 1 ", wherein the pin 3 of the logic unit connects described
The erasing pin (pin 15 in Fig. 5) of pulse counter, the pin 4 of logic unit be separately connected the pin 2 of logic unit with
And pin 1, the pin 5 of logic unit are separately connected the second end and power input of the 14th diode D14, logic unit
Pin 6 be separately connected the first end of twelfth resistor R12, the 9th diode D9, the tenth diode D10, the 11st diode
D11, the 12nd diode D12 and the 13rd diode D13, wherein the 9th diode D9, the tenth diode D10, the 11st
Diode D11, the 12nd diode D12 and the 13rd diode D13 are separately connected the pulse output pin of pulse counter,
The second end of twelfth resistor R12 is grounded, and the pin 7 of logic unit is grounded, and the pin 14 of logic unit connects power input.
Specifically, the output of pin 3 of comparator is the lower limit value of the range value of ammeter, and the pin 6 of comparator is defeated
It is out the upper limit value of the range value of ammeter, and when the measured value of electric current is less than the lower limit value of the range value of ammeter, than
Compared with the pin 5 that device can export high level to logic unit by pin 4, and what the pulse output pin of pulse counter was exported
High level can also be input to the pin 6 of logic unit, when two input terminal input high levels of logic unit, logic unit
Pin 4 can export a low level, and low level can be divided to by pin 1 and pin 2 and input for two low levels, from logic unit
One high level can be input to the erasing pin of pulse counter by pin 3, so that pulse counter can regenerate
Pulse train carries out the switching to range, to quickly realize switching of the ammeter from wide range to small-range.
Preferably, further includes:
Power circuit, the power output end of the power circuit respectively with the comparison circuit, range swithching circuit and
The power input of logic unit connects.
In being specifically illustrating of Fig. 5, power circuit includes power supply chip and power supply, in the model duration of power supply chip
The 78L089 that can be sold, wherein the pin 1 of power supply chip is separately connected the first end of power supply and the second end of the second capacitor C2,
The pin 2 of power supply chip is grounded, and the connection of pin 3 of power supply chip is separately connected power output end (end VCC in Fig. 5) and the
The first end of three capacitor C3, the second end of third capacitor C3 be separately connected the second capacitor C2 first end and power supply second
End.
Fig. 6 shows a kind of structural schematic diagram of ammeter of another embodiment of the invention proposition, as shown in fig. 6, institute
Stating ammeter includes:
Shell；And
The adaptive range switch circuit of the ammeter；
Wherein, the ammeter is connected in parallel with multiple range circuits, so that the ammeter has multiple range values.
Preferably, it is provided with manual switch on the shell, for described in the manual touch in response to operator and control
Logic unit works.
Specifically, in the specific example of Fig. 6, manual switch KEY, wherein the first end and logic list of manual switch
The pin 5 of member connects, and the second end of manual switch is connect with power input.
Preferably, display screen is provided on the shell.
Preferably, range indicator light is provided on the shell.
Fig. 7 shows a kind of process for the adaptive range switching method of ammeter that another embodiment of the invention proposes
Figure, as shown in Figure 7, which comprises
The measured value of ammeter is compared with the range value of ammeter, obtains comparison result；
Result switches over the range value of ammeter based on the comparison.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention may be used also on the basis of the above description for those of ordinary skill in the art
To make other variations or changes in different ways, all embodiments can not be exhaustive here, it is all to belong to this hair
The obvious changes or variations that bright technical solution is extended out are still in the scope of protection of the present invention.
Claims (10)
1. a kind of adaptive range switch circuit of ammeter characterized by comprising
Comparison circuit obtains comparison result for the measured value of ammeter to be compared with the range value of ammeter；
Range swithching circuit, result controls the on-off in the multiple range circuits in parallel with the ammeter based on the comparison.
2. the adaptive range switch circuit of ammeter according to claim 1, which is characterized in that the comparison circuit packet
It includes:
The comparator of model LM393, the measurement output end of pin 2 and pin 5 the connection ammeter of the comparator are described
The pin 7 of comparator connects the range swithching circuit.
3. the adaptive range switch circuit of ammeter according to claim 2, which is characterized in that the range swithching circuit
Include:
The pin 4 of the impulse generator of model 7555, the impulse generator connects the pin 7 of the comparator；
The pin 14 of the pulse counter of model CD4017, the pulse counter connects the pin 3 of the impulse generator,
The pulse output pin of the pulse counter connects the output end in the range circuit.
4. the adaptive range switch circuit of ammeter according to claim 3, which is characterized in that further include:
The pin 5 of the logic unit of model CD4011, the logic unit connects the pin 4 of the comparator, the logic
The pin 6 of unit connects the pulse output pin of the pulse counter, and the pin 4 of the logic unit is separately connected described patrol
The pin 1 and pin 2 of unit are collected, the pin 3 of the logic unit connects the erasing pin of the pulse counter.
5. the adaptive range switch circuit of ammeter according to claim 1, which is characterized in that further include:
Power circuit, the power output end of the power circuit respectively with the comparison circuit, range swithching circuit and logic
The power input of unit connects.
6. a kind of ammeter characterized by comprising
Shell；And
The adaptive range switch circuit of ammeter according to any one of claims 1 to 5；
Wherein, the ammeter is connected in parallel with multiple range circuits, so that the ammeter has multiple range values.
7. ammeter according to claim 6, which is characterized in that manual switch is provided on the shell, for responding
In operator it is manual touch and control the logic unit and work.
8. ammeter according to claim 6, which is characterized in that be provided with display screen on the shell.
9. ammeter according to claim 6, which is characterized in that be provided with range indicator light on the shell.
10. a kind of adaptive range switching method of ammeter, which comprises the following steps:
The measured value of ammeter is compared with the range value of ammeter, obtains comparison result；
Result switches over the range value of ammeter based on the comparison.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811639399.2A CN109633231A (en) | 2018-12-29 | 2018-12-29 | A kind of adaptive range circuit of ammeter, ammeter and the adaptive range switching method of ammeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811639399.2A CN109633231A (en) | 2018-12-29 | 2018-12-29 | A kind of adaptive range circuit of ammeter, ammeter and the adaptive range switching method of ammeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109633231A true CN109633231A (en) | 2019-04-16 |
Family
ID=66054691
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811639399.2A Pending CN109633231A (en) | 2018-12-29 | 2018-12-29 | A kind of adaptive range circuit of ammeter, ammeter and the adaptive range switching method of ammeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109633231A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110286257A (en) * | 2019-06-20 | 2019-09-27 | 西安易朴通讯技术有限公司 | Electric current detecting method and device, electronic equipment and computer readable storage medium |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202075334U (en) * | 2011-06-09 | 2011-12-14 | 河北工业大学 | Peak voltage digital display meter |
| JP5163905B2 (en) * | 2009-03-16 | 2013-03-13 | 横河電機株式会社 | measuring device |
| CN203643495U (en) * | 2013-07-14 | 2014-06-11 | 中国科学院近代物理研究所 | Self-adaption wide range current voltage conversion equipment |
| CN105738673A (en) * | 2016-02-04 | 2016-07-06 | 北京经纬恒润科技有限公司 | Measuring range switching method and measuring range switching circuit |
| CN106226579A (en) * | 2016-07-26 | 2016-12-14 | 佛山敏石芯片有限公司 | It is automatically adjusted the current-to-voltage converting circuit of range |
| CN106568997A (en) * | 2016-11-15 | 2017-04-19 | 深圳市鼎阳科技有限公司 | Switching control method and device of multimeter current range |
| CN207318583U (en) * | 2017-03-24 | 2018-05-04 | 陕西尚品信息科技有限公司 | A kind of DC digital voltmeter based on integral a/d converter |
-
2018
- 2018-12-29 CN CN201811639399.2A patent/CN109633231A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5163905B2 (en) * | 2009-03-16 | 2013-03-13 | 横河電機株式会社 | measuring device |
| CN202075334U (en) * | 2011-06-09 | 2011-12-14 | 河北工业大学 | Peak voltage digital display meter |
| CN203643495U (en) * | 2013-07-14 | 2014-06-11 | 中国科学院近代物理研究所 | Self-adaption wide range current voltage conversion equipment |
| CN105738673A (en) * | 2016-02-04 | 2016-07-06 | 北京经纬恒润科技有限公司 | Measuring range switching method and measuring range switching circuit |
| CN106226579A (en) * | 2016-07-26 | 2016-12-14 | 佛山敏石芯片有限公司 | It is automatically adjusted the current-to-voltage converting circuit of range |
| CN106568997A (en) * | 2016-11-15 | 2017-04-19 | 深圳市鼎阳科技有限公司 | Switching control method and device of multimeter current range |
| CN207318583U (en) * | 2017-03-24 | 2018-05-04 | 陕西尚品信息科技有限公司 | A kind of DC digital voltmeter based on integral a/d converter |
Non-Patent Citations (2)
| Title |
|---|
| 王剑: ""一种用于A/D 转换的量程自动控制电路"", 《华东地质学院学报》 * |
| 金星: ""数字式仪表的量程自动转换装置的研制"", 《试验技术与管理》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110286257A (en) * | 2019-06-20 | 2019-09-27 | 西安易朴通讯技术有限公司 | Electric current detecting method and device, electronic equipment and computer readable storage medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206876841U (en) | A kind of gas meter, flow meter power supply voltage detecting circuit | |
| CN108521168A (en) | Information quick storage protection power source circuit when a kind of electric energy meter power down | |
| CN109633231A (en) | A kind of adaptive range circuit of ammeter, ammeter and the adaptive range switching method of ammeter | |
| CN2932394Y (en) | Metering device with a wide current measuring range | |
| CN209342800U (en) | A kind of current detecting instrument | |
| CN105866533B (en) | A kind of Multifunctional single-phase time-sharing electricity meter | |
| CN206975105U (en) | Portable DC load current real- time recorder | |
| CN2575882Y (en) | Device for climbing pole of 35 kV single-pole cable | |
| CN209102868U (en) | A kind of portable relay intelligent test device | |
| CN208209621U (en) | Information quick storage protection power source circuit when electric energy meter power down | |
| CN202362363U (en) | Wide range single-phase electric energy meter | |
| CN208207574U (en) | Intelligent Internet of things socket controller | |
| CN208721739U (en) | Single-phase electric energy metering device with defencive function | |
| CN209513909U (en) | Two-way electrical energy metering device and bidirectional electric energy metering system | |
| CN208026334U (en) | A kind of adaptive power saving tongue tube pulsed counting device | |
| CN208573431U (en) | A kind of application circuit of intelligent electric cooker | |
| CN202888790U (en) | Resettable over/under-voltage protector based on one-chip microcomputer | |
| CN205620468U (en) | Multi -functional single -phase compound rate ammeter | |
| CN206559230U (en) | Electric power control circuit in a kind of delay | |
| CN201332319Y (en) | Current input measuring range automatic switching circuit of electromotor protecting device | |
| CN204731340U (en) | A kind of portable Intelligent terminal for Internet of things equipment failure intelligent detecting instrument | |
| CN207992316U (en) | A kind of metering device of air-source water heater | |
| CN104467056A (en) | Charging circuit | |
| CN204389567U (en) | A kind of single-phase intelligent electric power digital display meter | |
| CN209979736U (en) | Digital display alternating current voltmeter |
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 | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190416 |
|
| RJ01 | Rejection of invention patent application after publication |