CN202794345U - Intelligent dust storm electric field measuring system with adjustable range based on shield probe - Google Patents
Intelligent dust storm electric field measuring system with adjustable range based on shield probe Download PDFInfo
- Publication number
- CN202794345U CN202794345U CN 201220503651 CN201220503651U CN202794345U CN 202794345 U CN202794345 U CN 202794345U CN 201220503651 CN201220503651 CN 201220503651 CN 201220503651 U CN201220503651 U CN 201220503651U CN 202794345 U CN202794345 U CN 202794345U
- Authority
- CN
- China
- Prior art keywords
- module
- electric field
- dust storm
- processing unit
- end processing
- 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.)
- Expired - Fee Related
Links
Images
Abstract
The utility model discloses an intelligent dust storm electric field measuring system with adjustable range based on a shield probe. The intelligent dust storm electric field measuring system comprises the shield probe which is in contact with a dust storm electric field and is used for acquiring site signals of the dust storm electric field, a front-end processing unit which is connected with the shield probe by signals and is used to primarily process the site signals from the shield probe, a back-end processing unit which is connected with the front-end processing unit and is used to comprehensively process primary process results from the front-end processing unit under a manual control working mode or an automatic control working mode, and a switching unit which is connected with the back-end processing unit and is used to switch working modes. The intelligent dust storm electric field measuring system with the adjustable range based on the shield probe can overcome defects that the prior art has poor capacity of dust storm prevention, and does not have anti-interference capability, and that intelligentized level is low, etc. The intelligent dust storm electric field measuring system is advantaged by good capacity of dust storm prevention and high intelligentized level, and is capable of shielding side-direction electric fields.
Description
Technical field
The utility model relates to dust storm electric field measurement equipment technical field, particularly, relates to a kind of range adjustable intelligent dust storm electric field measurement system based on the shielding probe.
Background technology
The dust storm electric field, refer to that a kind of magnitude that forms with a certain amount of electric charge owing to the motion grains of sand (dirt) is higher than the electric field of a fine atmospheric electric field 2-3 order of magnitude in wind sand environment, directly affect the formation and development process of stream, the variation of sediment discharge intensity and normal transmission and the reception of communication radar signal.How to measure accurately and real-time the dust storm electric field in different wind sand environments (stream, sandstorm and dust devil), become a popular problem of environmental mechanics research field.
At present, electric field measurement equipment commonly used mainly contains two kinds: a kind of is the capacitance-type vibration formula atmospheric electric field measuring equipment that utilizes electric field induction electric charge and the development of capacitor discharge principle, and another kind is the rotation protected type atmospheric electric field measuring equipment that utilizes the development of electric field shielding principle.This two classes atmospheric electric field measuring equipment all exists some problems to make its cisco unity malfunction when being applied to special wind sand environment electric field measurement, and wherein topmost problem has following three aspects:
⑴ the different-grain diameter that is mingled with in the wind sand environment and the grains of sand of shape can impact vibration and the rotary inductive parts of electric field measurement equipment probe front end in the process of measuring, its result affects correctness and the precision of experimental result so that the inductive means of probe can't steady operation;
⑵ the existing atmospheric electric field measuring equipment linearity is better, respond sensitive working range mainly in 100kv/m, and in wind sand environment, particularly had been found that the existence of 200kv/m-300kv/m size electric field in sandstorm, therefore existing atmospheric electric field measuring equipment also can't satisfy the measurement of wind sand environment electric field from the angle of range;
⑶ dust storm electric field is because environment and the condition of its generation are very complicated, therefore its direction of an electric field is not what determine, its direction in three dimensions and size are all in continuous variation, and existing atmospheric electric field measuring equipment does not possess the independent measurement ability to the electric field three-dimensional component, therefore just can not intactly provide the distributed in three dimensions result of dust storm electric field yet.
As seen, also be not suitable at present the dust storm electric field is carried out effectively and the specific electric measuring equipment of Measurement accuracy, be cause lack so far to the dust storm electric field comparatively system observation and to the bottleneck of comprehensive announcement of its rule.In realizing process of the present utility model, the inventor finds there is at least the sand-proof ability in the prior art, do not possess the defectives such as antijamming capability and intelligent degree are low.
The utility model content
The purpose of this utility model is, for the problems referred to above, proposes a kind of range adjustable intelligent dust storm electric field measurement system based on the shielding probe, to realize that the sand-proof ability is strong, can shield lateral electric fields and the high advantage of intelligent degree.
For achieving the above object, the technical solution adopted in the utility model is: a kind of range adjustable intelligent dust storm electric field measurement system based on the shielding probe, comprise with the dust storm electric field and contacting, and be used for gathering the shielding probe of dust storm electric field on-site signal, be connected with described shielding probe signal, and be used for the on-site signal that comes the self-shileding probe is carried out the front-end processing unit of primary treatment, be connected with described front-end processing unit, and be used for the back-end processing unit that under the working method of manually control or automatically control, the primary treatment result from front-end processing unit carried out overall treatment, and be connected with described back-end processing unit, and the switch unit that is used for the switch operating mode.
Further, described front-end processing unit comprises the elementary filter and amplification module that is connected between described shielding probe and the back-end processing unit.
Further, when working method is manually control, described back-end processing unit comprises the rear end filtration module that is connected with described elementary filter and amplification module, the analog switch module that connects successively, sampling maintenance and peak detection block, A/D module, main control module and the client that is used for sending user instruction, and 1st to the N range amplification module of parallel join between described rear end filtration module and analog switch module; Described main control module also is connected with the analog switch module, the two-way connection between client and the main control module; N is natural number.
Further, described client comprises computing machine, or the handheld terminal that can communicate by letter with main control module.
Further, described main control module comprises single-chip microcomputer, and towards the interface module of external user.
Further, when working method is automatically control, described back-end processing unit comprises the voltage comparator that is connected with described elementary filter and amplification module, the modulation detection module and the signal processing module that connect successively, and 1st channel filtering amplification module and the 2nd channel filtering amplification module of parallel join between described voltage comparator and modulation detection module;
Be provided with not gate before the chip select signal of described the 1st channel filtering amplification module or the 2nd channel filtering amplification module, the 1st channel filtering amplification module links to each other with the 2nd channel filtering amplification module, and elementary filter and amplification module also is connected with the 1st channel filtering amplification module.
Further, described signal processing module comprises digital acquisition device (for example, can adopt auspicious rich magnificent RBH-8251 data acquisition unit).
Further, described signal processing module comprises A/D module and the main control module that is connected with described modulation detection module successively.
Further, described main control module comprises single-chip microcomputer or computing machine.
Further, described shielding probe comprises the vibrating capacitance probe that the protected type outer plate is fixing.
The range adjustable intelligent dust storm electric field measurement system based on the shielding probe of each embodiment of the utility model, owing to comprise with the dust storm electric field and contacting, and be used for gathering the shielding probe of dust storm electric field on-site signal, be connected with the shielding probe signal, and be used for the on-site signal that comes the self-shileding probe is carried out the front-end processing unit of primary treatment, be connected with front-end processing unit, and be used for the back-end processing unit that under the working method of manually control or automatically control, the primary treatment result from front-end processing unit carried out overall treatment, and be connected with the back-end processing unit, and the switch unit that is used for the switch operating mode; Be applicable to the electric field measurement system in the magnitude situation, can then be used for intelligence adjusting range passage by automatic range switching, when small-range, adopt more high-precision sense channel, after externally the electric field sudden change increases, automatically switch to the range amplification channel of larger one-level, the realization external electrical field is measured more accurately; Thereby can overcome sand-proof ability in the prior art, not possess antijamming capability and the low defective of intelligent degree, to realize that the sand-proof ability is strong, can shield lateral electric fields and the high advantage of intelligent degree.
Other features and advantages of the utility model will be set forth in the following description, and, partly from instructions, become apparent, perhaps understand by implementing the utility model.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Description of drawings
Accompanying drawing is used to provide further understanding of the present utility model, and consists of the part of instructions, is used from explanation the utility model with embodiment one of the present utility model, does not consist of restriction of the present utility model.In the accompanying drawings:
The principle of work synoptic diagram of Fig. 1 when to be the utility model based on the range adjustable intelligent dust storm electric field measurement system of shielding probe be manual control model;
The principle of work synoptic diagram of Fig. 2 when to be the utility model based on the range adjustable intelligent dust storm electric field measurement system of shielding probe be automatic control mode.
Embodiment
Below in conjunction with accompanying drawing preferred embodiment of the present utility model is described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the utility model, and be not used in restriction the utility model.
Embodiment one
According to the utility model embodiment, provide a kind of range adjustable intelligent dust storm electric field measurement system based on the shielding probe.As shown in Figure 1, present embodiment comprises the shielding probe that contacts and be used for gathering dust storm electric field on-site signal with the dust storm electric field, is connected and is used for the on-site signal that comes the self-shileding probe is carried out the front-end processing unit of primary treatment with the shielding probe signal, and is connected and is used for the back-end processing unit that under the manual working method of controlling, the primary treatment result from front-end processing unit carried out overall treatment with front-end processing unit.
Above-mentioned front-end processing unit comprises the elementary filter and amplification module that is connected between shielding probe and the back-end processing unit; This shielding probe comprises the vibrating capacitance probe that the protected type outer plate is fixing.
Above-mentioned back-end processing unit comprises the rear end filtration module that is connected with elementary filter and amplification module, the analog switch module that connects successively, sampling maintenance and peak detection block, A/D module, main control module and the client that is used for sending user instruction, and 1st to the N range amplification module of parallel join between rear end filtration module and analog switch module; Main control module also is connected with the analog switch module, the two-way connection between client and the main control module; N is natural number.This client comprises computing machine, or the handheld terminal that can communicate by letter with main control module; Main control module comprises single-chip microcomputer, and towards the interface module of external user.
The range adjustable intelligent dust storm electric field measurement system based on the shielding probe that Fig. 1 shows is a kind of manual multirange dust storm electric field measurement system.In this range adjustable intelligent dust storm electric field measurement system based on the shielding probe, signal flows to: the induced signal of vibrating capacitance probe sensing chip, elementary filter and amplification module by vibrating capacitance probe front end, enter the rear end filtration module, then access N road range amplification module, this N road range amplification module is connected into again the analog switch module.The signal of analog switch module output, the sampling maintenance and the peak detection block that enter the rear end are digital signal through the A/D module converts afterwards, enter single-chip microcomputer and store and export.
In the range adjustable intelligent dust storm electric field measurement system based on the shielding probe that Fig. 1 shows, hand range selects principle to be:
In this range adjustable intelligent dust storm electric field measurement system based on the shielding probe, the user can according to the needs of oneself, arrange the range passage by corresponding software in single-chip microcomputer.According to user-selected range, entered the single-chip microcomputer of back-end processing unit by the computer input instruction, the CPU OPADD gating signal of single-chip microcomputer is to the analog switch module, then one road range amplification module corresponding to gating signal is connected, front end signal will be by the range amplification module of gating, enter sampling maintenance and the peak detection block of rear end, after the A/D module converts is digital signal, the input single-chip microcomputer carries out further classified storage, outputs to client (such as computing machine) for user's usage data again.
Embodiment two
According to the utility model embodiment, provide a kind of range adjustable intelligent dust storm electric field measurement system based on the shielding probe.As shown in Figure 2, present embodiment comprises the shielding probe that contacts and be used for gathering dust storm electric field on-site signal with the dust storm electric field, is connected and is used for the on-site signal that comes the self-shileding probe is carried out the front-end processing unit of primary treatment with the shielding probe signal, and is connected and is used for the back-end processing unit that under the automatic working method of controlling, the primary treatment result from front-end processing unit carried out overall treatment with front-end processing unit.Here, front-end processing unit comprises the elementary filter and amplification module that is connected between shielding probe and the back-end processing unit; The shielding probe comprises the vibrating capacitance probe that the protected type outer plate is fixing.
Above-mentioned back-end processing unit comprises the voltage comparator that is connected with elementary filter and amplification module, the modulation detection module and the signal processing module that connect successively, and 1st channel filtering amplification module and the 2nd channel filtering amplification module of parallel join between voltage comparator and modulation detection module; Be provided with not gate before the chip select signal of the 1st channel filtering amplification module or the 2nd channel filtering amplification module, the 1st channel filtering amplification module links to each other with the 2nd channel filtering amplification module, and elementary filter and amplification module also is connected with the 1st channel filtering amplification module.This signal processing module comprises digital acquisition device; Perhaps, this signal processing module comprises A/D module and the main control module that is connected with modulation detection module successively.Main control module comprises single-chip microcomputer or computing machine.
The range adjustable intelligent dust storm electric field measurement system based on the shielding probe that Fig. 1 shows is a kind of automatic range switching dust storm electric field measurement system.In this range adjustable intelligent dust storm electric field measurement system based on the shielding probe, signal flows to: the induced signal of vibrating capacitance probe sensing chip, elementary filter and amplification module by vibrating capacitance probe front end, enter the voltage comparator of rear end, by with the comparison of reference voltage, judge the residing scope of front end signal, by the relatively rear outputs level signals of voltage comparator, switching signal as the 1st channel filtering amplification module or the 2nd channel filtering amplification module, front end signal is according to corresponding start signal, enter the filter and amplification passage of work, then enter modulation detection module, finally send into digital acquisition device.
In the range adjustable intelligent dust storm electric field measurement system based on the shielding probe that Fig. 1 shows, the automatic range switching principle is:
⑴ in the back-end processing unit, and the start signal that still is the 1st channel filtering amplification module is that the start signal of 0, the 2 channel filtering amplification module is all 0.Not gate (before changing the 1st channel filtering amplification module into not gate is set, principle is also identical) was set before the chip select signal of the 2nd channel filtering amplification module.
⑵ can produce the induced signal of an alternation after the vibrating capacitance probe of front end is sensed external electric field, through behind the pre-filtering amplifying circuit of front end, enter voltage comparator.The voltage comparator reference voltage is made as b, if front end input signal a＜b, voltage comparator output low level then, the 1st channel filtering amplification module (small-range passage) unlatching work, the 1st channel filtering amplification module that signal enters small-range carries out filter and amplification.If front end input signal a 〉=b, voltage comparator is exported high level signal so, and the 1st channel filtering amplification module of small-range is closed and quit work, and the 2nd channel filtering amplification module unlatching work of wide range.The primary signal of front end input rear end, the filter and amplification module that enters the wide range passage.
⑶ final, no matter which passage to finish the signal of filter and amplification at, finally all enters last modulation detection module, then sends into digital acquisition device.After the process digital acquisition device is transformed to digital signal, sends into computer terminal and carry out the data processing.
Embodiment three
According to the utility model embodiment, provide a kind of range adjustable intelligent dust storm electric field measurement system based on the shielding probe.As illustrated in fig. 1 and 2, present embodiment comprises the shielding probe that contacts and be used for gathering dust storm electric field on-site signal with the dust storm electric field, is connected and is used for the on-site signal that comes self-shileding to pop one's head in is carried out the front-end processing unit of primary treatment with the shielding probe signal, be connected and be used for the back-end processing unit that under the working method of manually control or automatically control, the primary treatment result from front-end processing unit carried out overall treatment with front-end processing unit, and is connected with the back-end processing unit and for the switch unit of switch operating mode.This front-end processing unit comprises the elementary filter and amplification module that is connected between shielding probe and the back-end processing unit; The shielding probe comprises the vibrating capacitance probe that the protected type outer plate is fixing.
When working method is manually control, above-mentioned back-end processing unit comprises the rear end filtration module that is connected with elementary filter and amplification module, the analog switch module that connects successively, sampling maintenance and peak detection block, A/D module, main control module and the client that is used for sending user instruction, and 1st to the N range amplification module of parallel join between rear end filtration module and analog switch module; Main control module also is connected with the analog switch module, the two-way connection between client and the main control module; N is natural number.This client comprises computing machine, or the handheld terminal that can communicate by letter with main control module; Main control module comprises single-chip microcomputer, and towards the interface module of external user.
When working method is automatically control, above-mentioned back-end processing unit comprises the voltage comparator that is connected with elementary filter and amplification module, the modulation detection module and the signal processing module that connect successively, and 1st channel filtering amplification module and the 2nd channel filtering amplification module of parallel join between voltage comparator and modulation detection module; Be provided with not gate before the chip select signal of the 1st channel filtering amplification module or the 2nd channel filtering amplification module, the 1st channel filtering amplification module links to each other with the 2nd channel filtering amplification module, and elementary filter and amplification module also is connected with the 1st channel filtering amplification module.This signal processing module comprises digital acquisition device; Perhaps, this signal processing module comprises A/D module and the main control module that is connected with modulation detection module successively.This main control module comprises single-chip microcomputer or computing machine.
In sum, the range adjustable intelligent dust storm electric field measurement system based on shielding probe of each embodiment of the utility model is in view of singularity such as the large electric field value of dust storm electric field, large impact power.Be provided with a kind of electric field measurement system of tackling in different magnitude situations, wherein the hand range switching mode can arrange the range passage at computer port by the user; The automatic range switching mode is then regulated the range passage for intelligence, when small-range, adopts more high-precision sense channel, after externally the electric field sudden change increases, automatically switches to the range amplification channel of larger one-level, and the realization external electrical field is measured more accurately; The vibrating capacitance probe that should adopt based on the range adjustable intelligent dust storm electric field measurement system of shielding probe is based on the fixing vibrating capacitance probe of protected type outer plate, has sand-proof, the function of shielding lateral electric fields; The back-end processing unit has adopted the CPU of single-chip microcomputer to process, and has realized intelligent measuring.
It should be noted that at last: the above only is preferred embodiment of the present utility model, be not limited to the utility model, although with reference to previous embodiment the utility model is had been described in detail, for a person skilled in the art, it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.
Claims (10)
1. range adjustable intelligent dust storm electric field measurement system based on shielding probe, it is characterized in that, comprise with the dust storm electric field and contacting, and be used for gathering the shielding probe of dust storm electric field on-site signal, be connected with described shielding probe signal, and be used for the on-site signal that comes the self-shileding probe is carried out the front-end processing unit of primary treatment, be connected with described front-end processing unit, and be used for the back-end processing unit that under the working method of manually control or automatically control, the primary treatment result from front-end processing unit carried out overall treatment, and be connected with described back-end processing unit, and the switch unit that is used for the switch operating mode.
2. the range adjustable intelligent dust storm electric field measurement system based on the shielding probe according to claim 1 is characterized in that described front-end processing unit comprises the elementary filter and amplification module that is connected between described shielding probe and the back-end processing unit.
3. according to claim 1 and 2 based on shielding the range adjustable intelligent dust storm electric field measurement system of popping one's head in, it is characterized in that, when working method is manually control, described back-end processing unit comprises the rear end filtration module that is connected with described elementary filter and amplification module, the analog switch module that connects successively, sampling maintenance and peak detection block, A/D module, main control module and the client that is used for sending user instruction, and 1st to the N range amplification module of parallel join between described rear end filtration module and analog switch module; Described main control module also is connected with the analog switch module, the two-way connection between client and the main control module; N is natural number.
4. the range adjustable intelligent dust storm electric field measurement system based on the shielding probe according to claim 3 is characterized in that described client comprises computing machine, or the handheld terminal that can communicate by letter with main control module.
5. the range adjustable intelligent dust storm electric field measurement system based on shielding probe according to claim 3 is characterized in that described main control module comprises single-chip microcomputer, and towards the interface module of external user.
6. according to claim 1 and 2 based on shielding the range adjustable intelligent dust storm electric field measurement system of popping one's head in, it is characterized in that, when working method is automatically control, described back-end processing unit comprises the voltage comparator that is connected with described elementary filter and amplification module, the modulation detection module and the signal processing module that connect successively, and 1st channel filtering amplification module and the 2nd channel filtering amplification module of parallel join between described voltage comparator and modulation detection module;
Be provided with not gate before the chip select signal of described the 1st channel filtering amplification module or the 2nd channel filtering amplification module, the 1st channel filtering amplification module links to each other with the 2nd channel filtering amplification module, and elementary filter and amplification module also is connected with the 1st channel filtering amplification module.
7. the range adjustable intelligent dust storm electric field measurement system based on the shielding probe according to claim 6 is characterized in that described signal processing module comprises digital acquisition device.
8. the range adjustable intelligent dust storm electric field measurement system based on the shielding probe according to claim 6 is characterized in that described signal processing module comprises A/D module and the main control module that is connected with described modulation detection module successively.
9. the range adjustable intelligent dust storm electric field measurement system based on the shielding probe according to claim 8 is characterized in that described main control module comprises single-chip microcomputer or computing machine.
10. the range adjustable intelligent dust storm electric field measurement system based on the shielding probe according to claim 1 and 2 is characterized in that, described shielding probe comprises the vibrating capacitance probe that the protected type outer plate is fixing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220503651 CN202794345U (en) | 2012-09-29 | 2012-09-29 | Intelligent dust storm electric field measuring system with adjustable range based on shield probe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220503651 CN202794345U (en) | 2012-09-29 | 2012-09-29 | Intelligent dust storm electric field measuring system with adjustable range based on shield probe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202794345U true CN202794345U (en) | 2013-03-13 |
Family
ID=47821587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220503651 Expired - Fee Related CN202794345U (en) | 2012-09-29 | 2012-09-29 | Intelligent dust storm electric field measuring system with adjustable range based on shield probe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202794345U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102879650A (en) * | 2012-09-29 | 2013-01-16 | 兰州大学 | Intelligent range-adjustable sandstorm electric field measuring system based on shielded probe |
| CN104062487A (en) * | 2013-03-20 | 2014-09-24 | 鸿富锦精密工业(武汉)有限公司 | Voltage detection system |
-
2012
- 2012-09-29 CN CN 201220503651 patent/CN202794345U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102879650A (en) * | 2012-09-29 | 2013-01-16 | 兰州大学 | Intelligent range-adjustable sandstorm electric field measuring system based on shielded probe |
| CN102879650B (en) * | 2012-09-29 | 2015-05-27 | 兰州大学 | Intelligent range-adjustable sandstorm electric field measuring system based on shielded probe |
| CN104062487A (en) * | 2013-03-20 | 2014-09-24 | 鸿富锦精密工业(武汉)有限公司 | Voltage detection system |
| CN104062487B (en) * | 2013-03-20 | 2016-08-24 | 国家电网公司 | Voltage detecting system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201508409U (en) | Intelligent battery data logging device | |
| CN101408553B (en) | Rotary peed-measuring and frequency outputting device | |
| CN102353831A (en) | Geomagnetic storm detection and early warning system for protecting safe running of power grid | |
| CN103412185A (en) | Lightning current detecting device | |
| CN103454486A (en) | Lightning arrester performance parameter detecting device | |
| CN211785733U (en) | Three-phase multifunctional metering system | |
| CN202794345U (en) | Intelligent dust storm electric field measuring system with adjustable range based on shield probe | |
| CN203365535U (en) | Vehicle current collection system and car having same | |
| CN102879650B (en) | Intelligent range-adjustable sandstorm electric field measuring system based on shielded probe | |
| CN107132167A (en) | High precision two line system industrial dust detection means | |
| CN201716103U (en) | Vibration detection device for micro-variation capacitance pole tower | |
| CN202794323U (en) | Thunder monitoring system and thunder monitoring terminal | |
| CN202904029U (en) | Low-power nuclear signal pulse amplitude analyzer | |
| CN205374585U (en) | Current collection device | |
| CN103529241A (en) | Interface circuit for acceleration sensor | |
| CN102621409A (en) | Ship power grid power quality monitoring system research based on DSP (digital signal processor) | |
| CN205484836U (en) | Multichannel pulse amplitude analyzer | |
| CN203310438U (en) | Sulfur hexafluoride online monitoring device | |
| CN201611372U (en) | Portable distribution transformer comprehensive test instrument | |
| CN202794355U (en) | Intelligent dust storm electric field measuring system based on three-dimensional probe and three-dimensional probe | |
| CN204535750U (en) | A kind of energy-saving type frequency conversion device on-Line Monitor Device | |
| CN109557332B (en) | Rotation speed signal conversion device based on Taylor algorithm | |
| CN203519640U (en) | Acceleration sensor interface circuit | |
| CN103049154A (en) | Touch signal acquisition method for capacitive touch switch | |
| CN201373763Y (en) | Self-adjusting site perceiving intelligent level gage |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130313 Termination date: 20150929 |
|
| EXPY | Termination of patent right or utility model |