CN202649316U - Field intensity indicator - Google Patents
Field intensity indicator Download PDFInfo
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- CN202649316U CN202649316U CN 201220301265 CN201220301265U CN202649316U CN 202649316 U CN202649316 U CN 202649316U CN 201220301265 CN201220301265 CN 201220301265 CN 201220301265 U CN201220301265 U CN 201220301265U CN 202649316 U CN202649316 U CN 202649316U
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Abstract
The utility model discloses a field intensity indicator, and relates to an electric field intensity measuring technique. The field intensity indicator comprises a power source module used for supplying power to the field intensity indicator, a main control module used for controlling the measurement and displaying the electric field intensity, and a radio frequency module used for completing the measurement of the electric field intensity. According to the field intensity indicator, the local oscillation source adopts a low-phase-noise frequency synthetic chip ADF4350 so as to acquire low-phase-noise local oscillation signals, and coordinates with a low noise amplifier so as to reduce the noise coefficient of the whole receiving circuit, and accordingly the measurement of small signals is realized. Aiming at the to-be-tested frequency point space electric field signals, a frequency spectrum mode, a dot frequency mode and a scanning mode can be selected so that a problem of singularity of a measuring mode in the prior art is overcome. According to the field intensity indicator, a metal structure is adopted so that signals generated by the field intensity indicator during operation can be shielded by the metal structure, and thus the normal operation of other devices is not interfered; and at the same time, the operation of the field intensity indicator is not interfered by external wireless signals. The product has an appropriate size and weight, and thus is easy to carry. In addition, a lithium battery is adopted for power supply, and thus the field intensity indicator is suitable for use in a field work occasion.
Description
Technical field
The utility model relates to the electric field intensity measuremenrt technology, particularly a kind of field intensity meter of measurement space electric field intensity.
Background technology
Existing field intensity meter is mainly used in field of broadcast televisions, and the frequency measurement scope is 46MHz ~ 870MHz, and can not measure the signal less than 30dBuv.Frequency measurement scope and small-signal measurement capability can not satisfy the requirement of radio communication fields of measurement.And measurement pattern is single, measures with single-frequency point, shows the single-frequency point measurement result, can't satisfy the needs of practical engineering application.Existing field intensity meter volume is large, is not easy to carry.
The utility model content
The purpose of this utility model is to provide a kind of field intensity meter, is used for overcoming the existing problem that the field intensity meter measurement range is little, pattern is single.
For achieving the above object, the utility model provides a kind of field intensity meter, comprising:
Be used for to the power module of described field intensity meter power supply;
Be used for the main control module of control and demonstration electric field intensity measuremenrt, link to each other with described power module;
Be used for finishing the radio-frequency module of electric field intensity measuremenrt, link to each other with described power module and main control module.
Further, the local vibration source of field intensity meter adopts the low frequency synthesis chip ADF4350 that makes an uproar mutually in the utility model, obtains low local oscillation signal of making an uproar mutually, and cooperates low noise amplifying circuit, reduce the noise figure of whole receiving circuit, thereby realized the measurement of small-signal.
For the frequency space electric field strength signal that will test, reception, master control borad by rf board calculates recording signal, the storage of the data of data storage cell, can select three kinds of display modes, be spectrum mode, point frequently pattern, scan pattern, overcome the single problem of measurement pattern in the prior art.
Effect of the present utility model is: product structure of the present utility model adopts metal construction, and the signal shielding that produces in the time of self can being worked can not disturb other equipment normal operation.Product size and weight are moderate, are easy to carry about with one; Adopt in addition lithium battery power supply, be fit to the field work occasion and use.
Description of drawings
The structural drawing of the field intensity meter that Fig. 1 provides for the utility model embodiment;
Fig. 2 is the structural drawing of power module among the utility model embodiment;
Fig. 3 is the structural drawing of main control module among the utility model embodiment;
Fig. 4 is the structural drawing of radio-frequency module among the utility model embodiment.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing the utility model is described in further detail.
The field intensity meter that present embodiment provides mainly comprises three parts, as shown in Figure 1, is respectively power module 1, main control module 2 and radio-frequency module 3, can adapt to electromagnetic compatibility and shielding protection, and the needs of cabling.
Concrete frequency by the keyboard input will be tested frequency by the serial communication of CPU and liquid crystal display, is presented on the liquid crystal display frequency information that will test frequency; While, CPU the frequency frequency information that will test was sent to the local oscillation circuit on the radio-frequency module, and control local oscillation circuit oscillation frequency makes the local oscillation circuit oscillation frequency corresponding one by one with the frequency that will test frequency.The frequency space electric field strength signal of testing enters radio-frequency module by antenna reception, radio-frequency module amplifies to the received signal, decay, together enter into frequency mixer with local oscillation signal, carry out mixing, the intermediate-freuqncy signal of output 10.7MHz, judge the level value (the signal electric field intensity that will test frequency equals the antenna gain factor and adds the intermediate-freuqncy signal level value) of the intermediate-freuqncy signal of 10.7MHz by radio frequency chip SI4734, and the CPU that measures actual level numerical value and send to main control module, CPU sends to liquid crystal display to the result who measures by the serial communication mode again and shows.
In the present embodiment, power module 1 mainly is divided into battery 11, battery charger 12 and voltage conversion circuit 13 parts, as shown in Figure 2.
Battery 11 adopts large capacity 7.4V lithium battery, keeps at least 4 hours working times.
Battery charger 12 adopts LTC1732-8.4, and the charging current of maximum 1.5A also can satisfy the needs of rapid charge.CPU defines by the level of judging A1-1 10 pin does not have the external power access, and the light on and off by lamp A1-3 judge whether that in charging bright representative is in charging, and the representative charging of going out is finished; Thereby obtain battery voltage value by converting simultaneously, the foundation of the not enough automatic shutdown of electric weight is judged in demonstration and conduct.
Voltage conversion circuit 13, be used for power supply input direct voltage with 12V ~ 9V to change into+5V and+9V ,+3.3V supply voltage offers main control module and radio-frequency module, mainly is comprised of A3-1, A3-2, A3-3 isolation module and A3-4 3.3V power supply chip.
Main control module 2 mainly comprises CPU21, GPS modular circuit 22, data storage cell 23, keyboard/display circuit 24 and usb circuit 25, as shown in Figure 3.
CPU21 is used for control and will tests that the frequency information of frequency signal shows and the demonstration of measurement result, and the control frequency information that will test frequency is sent to the local oscillation circuit on the radio-frequency module, the oscillation frequency of control local oscillation circuit.32 ARM microcontroller LPC2148 have been adopted.Adopt the integrated functional module of chip internal, reduced the total number of devices of equipment, improve the reliability of equipment.The abundant internal resource of CPU, powerful processing power have made things convenient for realization and the upgrading of systemic-function in addition.
GPS modular circuit 22 is used for receiving the GPS locating information, and CPU obtains GPS information by serial ports with inquiry mode, and field intensity meter can be presented at GPS information on the liquid crystal display, is prompted to accurately job position of operator.
Data storage cell 23 is used for storage to the various parameters of field intensity meter, adopts FeRAM memory chip (FM24CL64), guarantees that the power down of data is not lost, and guarantees the safe storage of critical data.
Keyboard/display circuit 24 is used for the concrete frequency that input will be tested frequency, and under the control of CPU, the frequency information that test frequency is presented on the liquid crystal display.Keyboard and display circuit have formed main human-computer interaction interface, and the operator operates field intensity meter by keyboard, mainly comprise various parameters and transformation working pattern etc. are set, and the operator is by various settings and the measurement data of liquid crystal display observation field intensity meter.Liquid crystal display is selected 4.3 cun intelligent liquid-crystal screens of JCR43HD-S type, adopts serial port ,+5V power supply; CPU communicates by letter with liquid crystal display by the MAX3232 serial port chip.Keyboard circuit adopts the 5*5 matrix, the sweep signal high level, and the detection signal high level is effective, and button triggers and adopts interrupt mode.Liquid crystal display shows three kinds of pattern measurement results: spectrum mode, point be pattern, scan pattern frequently.Spectrum mode is exactly each the Frequency point space electric field strength values that shows in one section frequency band; Point frequently pattern is exactly the space electric field strength values that only shows single frequency point; Scan pattern is exactly the space electric field strength values that shows the several frequencies that prestore.
Usb circuit 25 is used for by USB interface and compunication.
Radio-frequency module 3 comprises antenna 31, local oscillation circuit 33, controllable gain attenuator 32, and mixer chip 34, and signal strength measurement demodulation chip 35, as shown in Figure 4.
Antenna 31 is used for receiving and will tests frequency space electric field strength signal.
Controllable gain attenuator 32 forms the receiving circuit prime, be used for antenna reception to the amplitude that will test frequency space electric field strength signal adjust to the SI4734 linearity accept scope (47dBm ~-67dBm), guarantee that small-signal-107dBm and large-signal-27dBm can receive.
Local oscillation circuit 33 is used for producing the required local oscillation signal of mixer chip under the control of CPU, and the oscillation frequency of local oscillation signal is certain with the difference of the frequency that will test frequency, is 2.0893GHz.Local oscillation circuit 33 is comprised of chip ADF4350.The output frequency of local oscillation signal is respectively 2.0897GHz ~ 3.0893GHz, 1.7786GHz and 300MHz.
Mixer chip 34 is used for testing frequency space electric field strength signal and local oscillation signal carries out mixing, and the signal of a fixed frequency 10.7MHz of output is to signal strength measurement chip SI4734.
Signal strength measurement chip 35 adopts the SI4734 chip, judges the level numerical value of 10.7MHz signal by inner detecting circuit, and gained level numerical value is definite value with testing frequency space electric field strength signal difference, i.e. the numerical value of the antenna gain factor.And actual measurement result sent to CPU by I2C communication, CPU sends the result who measures to liquid crystal display by serial communication again and shows.
The metal shell of field intensity meter adopts aluminum alloy materials, does electric conductive oxidation at casing inner surface and processes, and makes things convenient for each circuit board ground connection in the shell, and plays good effectiveness.Shell is divided into 2 parts, a part is the main casing that has the various interface opening, with a loam cake, 3 circuit boards adopt slot to add the mode that screw reinforces and are positioned in the casing, liquid crystal display then is screwed in the front panel of casing inboard, and other interface also is fixed in corresponding casing opening part with corresponding screw and nut.
Present embodiment has been realized widening of survey frequency and the increase of measuring range, has realized the display mode of three kinds of measurement results: point is pattern, spectrum mode, scan pattern frequently.In the use procedure of radio network optimization engineering, provide convenient, fast, test function accurately.
In a word, the above is preferred embodiment of the present utility model only, is not be used to limiting protection domain of the present utility model.
Claims (7)
1. a field intensity meter is characterized in that, comprising:
Be used for to the power module of described field intensity meter power supply;
Be used for the main control module of control and demonstration electric field intensity measuremenrt, link to each other with described power module;
Be used for finishing the radio-frequency module of electric field intensity measuremenrt, link to each other with described power module and main control module.
2. field intensity meter according to claim 1 is characterized in that, described power module specifically comprises:
The battery that is used for power supply;
Battery charger for charging the battery links to each other with described battery;
Be used for power supply input direct voltage with 12V ~ 9V to convert to+5V ,+9V and+the 3.3V supply voltage, and offer the voltage conversion circuit of main control module and radio-frequency module, link to each other with radio-frequency module with described main control module.
3. field intensity meter according to claim 2 is characterized in that, described main control module specifically comprises:
Be used for control and will test frequency information demonstration and the measurement result demonstration of frequency signal, and the CPU of control radio-frequency module oscillation frequency;
Be used for the concrete frequency that input will be tested frequency, and under the control of CPU, make the frequency information that to test frequency be presented at keyboard/display circuit on the liquid crystal display, link to each other with described CPU;
Be used for storing described field intensity meter parameters data storage unit, link to each other with described keyboard/display circuit.
4. field intensity meter according to claim 3 is characterized in that, described main control module further comprises:
Be used for to receive the GPS locating information and GPS information is presented at GPS modular circuit on the liquid crystal display, link to each other with described CPU and keyboard/display circuit;
Be used for the usb circuit by USB interface and compunication, link to each other with described CPU.
5. according to claim 3 or 4 described field intensity meters, it is characterized in that described radio-frequency module specifically comprises:
Be used for receiving the antenna that to test frequency space electric field strength signal;
Be used for antenna reception to the amplitude that will the test frequency space electric field strength signal linearity of adjusting to described radio-frequency module accept the controllable gain attenuator of scope, link to each other with described antenna;
Local oscillation circuit chip ADF4350 for generation of local oscillation signal;
Be used for to test the mixer chip that frequency space electric field strength signal and described local oscillation signal carry out mixing and export a fixed frequency signal, link to each other with described controllable gain attenuator and local oscillation circuit chip;
Signal strength measurement chip for the level numerical value of judging described fixed frequency signal links to each other with described mixer chip.
6. field intensity meter according to claim 5 is characterized in that, liquid crystal display adopts spectrum mode, point frequently pattern or scan pattern display measurement result.
7. field intensity meter according to claim 5, it is characterized in that the metal shell of described field intensity meter comprises the main casing with interface opening, and a loam cake, the mode that circuit board adopts slot to add the screw reinforcing is positioned in the shell, and liquid crystal display is screwed in the front panel of shell inboard.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220301265 CN202649316U (en) | 2012-06-21 | 2012-06-21 | Field intensity indicator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220301265 CN202649316U (en) | 2012-06-21 | 2012-06-21 | Field intensity indicator |
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| CN202649316U true CN202649316U (en) | 2013-01-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220301265 Expired - Lifetime CN202649316U (en) | 2012-06-21 | 2012-06-21 | Field intensity indicator |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103529308A (en) * | 2013-09-17 | 2014-01-22 | 中国人民解放军装备学院 | Fuzzy method and equipment for electronic equipment equivalent radiation power test |
| CN103825665A (en) * | 2014-02-24 | 2014-05-28 | 联想(北京)有限公司 | Method and electronic device for antenna registration |
| CN107809636A (en) * | 2017-11-30 | 2018-03-16 | 安徽汇鑫电子有限公司 | Terrestrial DTV on-road emission test instrument |
| CN108362372A (en) * | 2017-12-21 | 2018-08-03 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Low frequency noise measurement system |
-
2012
- 2012-06-21 CN CN 201220301265 patent/CN202649316U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103529308A (en) * | 2013-09-17 | 2014-01-22 | 中国人民解放军装备学院 | Fuzzy method and equipment for electronic equipment equivalent radiation power test |
| CN103825665A (en) * | 2014-02-24 | 2014-05-28 | 联想(北京)有限公司 | Method and electronic device for antenna registration |
| CN103825665B (en) * | 2014-02-24 | 2016-01-27 | 联想(北京)有限公司 | A kind of method of antenna registration and electronic equipment |
| CN107809636A (en) * | 2017-11-30 | 2018-03-16 | 安徽汇鑫电子有限公司 | Terrestrial DTV on-road emission test instrument |
| CN108362372A (en) * | 2017-12-21 | 2018-08-03 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Low frequency noise measurement system |
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Granted publication date: 20130102 |
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| CX01 | Expiry of patent term |