CN206515391U - A kind of power and current detecting system based on ionosonde - Google Patents
A kind of power and current detecting system based on ionosonde Download PDFInfo
- Publication number
- CN206515391U CN206515391U CN201720211080.4U CN201720211080U CN206515391U CN 206515391 U CN206515391 U CN 206515391U CN 201720211080 U CN201720211080 U CN 201720211080U CN 206515391 U CN206515391 U CN 206515391U
- Authority
- CN
- China
- Prior art keywords
- electric capacity
- power
- circuit
- resistance
- pins
- 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
Abstract
The utility model is related to power and current measurement techniques field, specifically related to a kind of power and current detecting system based on ionosonde, a kind of power and current detecting system based on ionosonde, including single-chip microcomputer, radiofrequency signal, in addition to power detection module, current detection module and the display module being connected with single-chip microcomputer；The power detection module includes π type attenuation networks circuit, impedance matching circuit, power-sensing circuit, low-pass filter circuit I；The current detection module includes current detection circuit, low-pass filter circuit II and shunt resistance device R9.The detecting system is simple in construction, reliable, easy to operate, goes for power and current detecting and the monitoring of a variety of occasions, and convenient observation can allow user to understand equipment current operating state.
Description
Technical field
The utility model belongs to power and current measurement techniques field, more particularly to a kind of work(based on ionosonde
Rate and current detecting system.
Background technology
Power measurement be used for detect electrical equipment consumption power, be widely used in household electrical appliance, lighting apparatus, industry should
With etc. field.The operating efficiency of circuit can be determined by power measurement, power, the receiver of signal generator can also be determined
Sensitivity and amplifier the parameter such as gain, power is a key factor for characterizing device characteristics, by measuring power,
With this detection device working characteristics, it is significant so as to carry out accurate measurement to power in radio band.While power monitoring
An important step of equipment protection, can correctly, effectively, detect state change in time, be that can is protected
The key of shield.The method of power detection has：Diode detection power method, equivalent heat power detection method, real effective/direct current conversion
Detect power method and logarithmic amplification detection power method etc..
Utility model content
The purpose of this utility model is to provide a kind of operating current to equipment transmitting RF signal power value and system and entered
Row measurement, and can be with the current working condition of display device, the detecting system of convenient observation.
To achieve the above object, the technical solution adopted in the utility model is：A kind of power based on ionosonde
And current detecting system, including single-chip microcomputer, radiofrequency signal, in addition to power detection module, the current detecting being connected with single-chip microcomputer
Module and display module；
The power detection module includes π type attenuation networks circuit, impedance matching circuit, power-sensing circuit, low pass filtered
Wave circuit I；The π types attenuation network circuit input end is connected with radiofrequency signal, the input of output end and impedance matching circuit
It is connected, the output end of the impedance matching circuit is connected with power-sensing circuit input, the output of the power-sensing circuit
End is connected with the input of the low-pass filter circuit I, and the output end of the low-pass filter circuit I is connected with single-chip microcomputer；
The current detection module includes current detection circuit, low-pass filter circuit II and shunt resistance device R9；The electricity
The input of current detection circuit is connected in circuit by shunt resistance device R9, the output end and low pass of the current detection circuit
Filter circuit II input is connected, and the output end of the low-pass filter circuit II is connected with the single-chip microcomputer.
In above-mentioned power and current detecting system based on ionosonde, the π types attenuation network circuit bag
Resistance R1, resistance R2, resistance R3 are included, the radiofrequency signal connects resistance R1 and resistance R2 one end, and the resistance R2 other end connects
Connecting resistance R3 one end, the resistance R1 other ends, the R3 other end are grounded respectively.
In above-mentioned power and current detecting system based on ionosonde, the power-sensing circuit includes work(
Rate detection chip A1 and power filtering capacitor I, the power detection chip A1 use AD8318；The power filtering capacitor I bags
Include electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6；One end of the electric capacity C3 and electric capacity C4 one end connect the 4 of the AD8318
Number pin, electric capacity C3 and electric capacity the C4 other end are grounded respectively；Electric capacity C5 one end and electric capacity C6 one end connection are described
AD8318 No. 9 pins, the electric capacity C5 other end and the electric capacity C6 other end are grounded respectively.
In above-mentioned power and current detecting system based on ionosonde, the impedance matching circuit includes electricity
Hinder R4, electric capacity C1, electric capacity C2, electric capacity C8；One end connection electric capacity C1 of resistance R4 one end, resistance the R4 other end and electricity
The one end for holding C2 is grounded respectively, and the other end of the electric capacity C1 connects No. 14 pins of the AD8318, and the electric capacity C2's is another
One end connects No. 15 pins of the AD8318, and one end of the electric capacity C8 connects No. 5 pins of the AD8318, electric capacity C8's
The other end is grounded.
In above-mentioned power and current detecting system based on ionosonde, the low-pass filter circuit I includes
Resistance R8 and electric capacity C7, the resistance R8 one end connect No. 6 pins of the AD8318, the other end connection of the resistance R8
Electric capacity C7 one end, and as output level pin, the other end of the electric capacity C7 is grounded.
In above-mentioned power and current detecting system based on ionosonde, the current detection circuit includes electricity
Flow detection chip A2 and power filtering capacitor II；The current detecting chip A2 uses INA282；The power filtering capacitor II
Including electric capacity C10 and electric capacity C11；One end of the shunt resistance device R9 connects No. 1 pin of the INA282, the shunting electricity
The other end for hindering device R9 connects No. 8 pins of the INA282；One end of the electric capacity C10 and electric capacity C11 one end connection institute
INA282 No. 6 pins are stated, the other end of the electric capacity C10 and the electric capacity C11 other end are grounded respectively.
In above-mentioned power and current detecting system based on ionosonde, the low-pass filter circuit II includes
Resistance R10 and electric capacity C9, the resistance R10 one end connect No. 5 pins of the INA282, resistance the R10 other end and electricity
The one end for holding C9 is connected, and as output level pin, the other end of the electric capacity C9 is grounded.
The beneficial effects of the utility model：The detecting system is simple in construction, reliable, easy to operate, goes for a variety of
The power and current detecting of occasion and monitoring, convenient observation, can allow user to understand equipment current operating state.
Brief description of the drawings
Fig. 1 is the system block diagram of the utility model one embodiment；
Fig. 2 is the power detection module circuit diagram of the utility model one embodiment；
Fig. 3 is the current detection module circuit diagram of the utility model one embodiment；
Fig. 4 is the power detection curve map of the utility model one embodiment；
Fig. 5 is the current detecting curve map of the utility model one embodiment.
Embodiment
Embodiment of the present utility model is described in detail below in conjunction with the accompanying drawings.
The example of the embodiment is shown in the drawings, wherein same or similar label represents identical or class from beginning to end
As element or the element with same or like function.The embodiments described below with reference to the accompanying drawings are exemplary, only
For explaining the utility model, and it can not be construed to limitation of the present utility model.
Following disclosure provides many different embodiments or example is used for realizing different structure of the present utility model.For
Simplify disclosure of the present utility model, hereinafter the part and setting of specific examples are described.They are only merely illustrative, and
And purpose does not lie in limitation the utility model.In addition, the utility model can in different examples repeat reference numerals and/or word
It is female.This repetition is for purposes of simplicity and clarity, between discussed various embodiments itself are not indicated and/or are set
Relation.In addition, the utility model provides the example of various specific techniques and material, but those of ordinary skill in the art can
With the use of the applicability and/or other materials of recognizing other techniques.In addition, fisrt feature described below is special second
Levy it " on " structure can include the first and second features and be formed as the embodiment that directly contacts, other spy can also be included
The embodiment to be formed between the first and second features is levied, such first and second feature may not be direct contact.
In description of the present utility model, it is necessary to explanation, unless otherwise prescribed and limit, term " connected " " connection " answer
It is interpreted broadly, can is direct for example, it may be mechanically connecting or electrical connection or the connection of two element internals
It is connected, can also be indirectly connected to by intermediary, can be according to specific feelings for those of ordinary skill in the related art
Condition understands the concrete meaning of above-mentioned term.
Technical solutions of the utility model are as follows：A kind of power and current detecting system based on ionosonde, including
Single-chip microcomputer, radiofrequency signal, in addition to power detection module, current detection module and the display module being connected with single-chip microcomputer；
The power detection module includes π type attenuation networks circuit, impedance matching circuit, power-sensing circuit, low pass filtered
Wave circuit I；The π types attenuation network circuit input end is connected with radiofrequency signal, the input of output end and impedance matching circuit
It is connected, the output end of the impedance matching circuit is connected with power-sensing circuit input, the output of the power-sensing circuit
End is connected with the input of the low-pass filter circuit I, and the output end of the low-pass filter circuit I is connected with single-chip microcomputer；
The current detection module includes current detection circuit, low-pass filter circuit II and shunt resistance device R9；The electricity
The input of current detection circuit is connected in circuit by shunt resistance device R9, the output end and low pass of the current detection circuit
Filter circuit II input is connected, and the output end of the low-pass filter circuit II is connected with the single-chip microcomputer.
Further, the π types attenuation network circuit includes resistance R1, resistance R2, resistance R3, the radiofrequency signal connection electricity
Hinder R1 and resistance R2 one end, resistance R2 other end connection resistance R3 one end, the resistance R1 other ends, R3 other end difference
Ground connection.
Further, the power-sensing circuit includes power detection chip A1 and power filtering capacitor I, the power detection
Chip A1 uses AD8318；The power filtering capacitor I includes electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6；The electric capacity C3
One end and electric capacity C4 one end connect No. 4 pins of the AD8318, electric capacity C3 and electric capacity the C4 other end are grounded respectively；Electricity
Hold C5 one end and electric capacity C6 one end connects No. 9 pins of the AD8318, the electric capacity C5 other end and electric capacity C6's is another
End is grounded respectively.
Further, the impedance matching circuit includes resistance R4, electric capacity C1, electric capacity C2, electric capacity C8；The one of the resistance R4
End connection electric capacity C1 one end, the resistance R4 other end and electric capacity C2 one end are grounded respectively, and the other end of the electric capacity C1 connects
No. 14 pins of the AD8318 are connect, the other end of the electric capacity C2 connects No. 15 pins of the AD8318, the electric capacity C8
One end connect No. 5 pins of the AD8318, electric capacity C8 other end ground connection.
Further, the low-pass filter circuit I includes resistance R8 and electric capacity C7, the resistance R8 one end connection are described
AD8318 No. 6 pins, the other end connection electric capacity C7 of resistance R8 one end, and it is used as output level pin, the electricity
Hold C7 other end ground connection.
Further, in above-mentioned power and current detecting system based on ionosonde, the current detecting electricity
Road includes current detecting chip A2 and power filtering capacitor II；The current detecting chip A2 uses INA282；The power supply filter
Ripple electric capacity II includes electric capacity C10 and electric capacity C11；One end of the shunt resistance device R9 connects No. 1 pin of the INA282, institute
The other end for stating shunt resistance device R9 connects No. 8 pins of the INA282；One end of the electric capacity C10 and the one of electric capacity C11
The end connection INA282 No. 6 pins, the other end of the electric capacity C10 and the electric capacity C11 other end are grounded respectively.
Further, the low-pass filter circuit II includes resistance R10 and electric capacity C9, the resistance R10 one end connection
No. 5 pins of the INA282, the resistance R10 other end is connected with electric capacity C9 one end, and as output level pin, it is described
Electric capacity C9 other end ground connection.
When it is implemented, as shown in figure 1, a kind of power and current detecting system based on ionosonde include monolithic
Machine, in addition to power detection module, current detection module and the display module being connected with single-chip microcomputer.
Wherein, power detection module also includes π type attenuation networks circuit, impedance matching circuit, power-sensing circuit, low pass
Filter circuit I.The input of π type attenuation network circuits is connected with radiofrequency signal, the output end of pin network circuit and impedance matching
The input of circuit is connected, and the output end of impedance matching circuit is connected with power-sensing circuit input, power-sensing circuit
Output end is connected with low-pass filter circuit I inputs, and low-pass filter circuit I output end is connected with single-chip microcomputer；That is radiofrequency signal
Power be adjusted by π type attenuation networks to the detection range of power-sensing circuit, phase is exported by power-sensing circuit
Voltage signal is answered, the single-chip microcomputer is connected to by low-pass filter circuit I output end；π type attenuation network circuits are believed radio frequency
Number decayed, adjusted to the detection range of power-sensing circuit.Impedance matching circuit is by radiofrequency signal after overmatching
It is output to power-sensing circuit.Power-sensing circuit is detected to the power of radiofrequency signal, and it is defeated to be converted into corresponding level value
Go out.Low-pass filter circuit I is used to export power-sensing circuit corresponding level low-pass filtering.
Wherein, current detection module includes current detection circuit and low-pass filter circuit I and shunt resistance device R9；Electric current is examined
The input of slowdown monitoring circuit is connected in circuit by shunt resistance device R9, the output end and low-pass filter circuit of current detection circuit
II input is connected, and low-pass filter circuit II output end is connected with the single-chip microcomputer.
Current detection circuit is detected to system operating current and is converted into relevant voltage signal output.LPF electricity
Road II is used to export current detection circuit corresponding level low-pass filtering.
As shown in Fig. 2 in order to realize that the power by radiofrequency signal is converted into corresponding level value, in the present embodiment, work(
Rate detection circuit include power detection chip and power filtering capacitor I, power detection chip A1 model AD8318, it respectively draws
Pin is defined as：No. 1 pin, No. 2 pins, No. 8 pins, No. 11 pins, No. 12 pins are input grounding；No. 3 pins, No. 4 pins,
No. 9 pins are power supply anode；No. 5 pins are loop filtering electric capacity；No. 6 pins export for level；No. 7 pins select for pattern
Select；No. 10 pins are temperature-compensating；No. 13 pins export for temperature sensor；No. 14 pins, No. 15 pins input for radio frequency；16
Number pin is equipment control.
Also, power filtering capacitor I includes electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6；Electric capacity C3 one end and electric capacity
C4 one end connects AD8318 No. 4 pins, and electric capacity C3 and the C4 other end are grounded respectively, electric capacity C5 one end and electric capacity C6's
One end connects AD8318 No. 9 pins, and the electric capacity C5 other end and the electric capacity C6 other end are grounded respectively.
Also, π type attenuation networks circuit includes resistance R1, resistance R2, resistance R3, radiofrequency signal connection resistance R1 one end
And resistance R2 one end, resistance R2 other end connection resistance R3 one end, the resistance R1 other end, the R3 other end connect respectively
Ground.
Also, impedance matching circuit includes resistance R4, electric capacity C1, electric capacity C2, electric capacity C8, resistance R4 one end connection electric capacity
C1 one end, the resistance R4 other end and electric capacity C2 one end are grounded respectively, No. 14 of electric capacity C1 other end connection AD8318
Pin, the electric capacity C2 other end connects AD8318 No. 15 pins, and electric capacity C8 one end connects AD8318 No. 5 pins, electric capacity
C8 other end ground connection.
Also, low-pass filter circuit I includes resistance R8 and electric capacity C7, resistance R8 one end connects AD8318 No. 6 pins,
Resistance R8 other end connection electric capacity C7 one end, and as output level pin, the electric capacity C7 other end is grounded.
As shown in figure 3, in order to realize that the operating current by system is converted into corresponding level value, in the present embodiment, electricity
Current detection circuit includes current detecting chip, power filtering capacitor II and shunt resistance device；Current detecting chip A2 model
INA282, its pin definitions is：No. 1 pin：The negative input of shunt resistance device；No. 2 pins：Ground connection；No. 3 pins, No. 7 pins：
Reference voltage；No. 4 pins：Blank pipe pin；No. 5 pins：Output voltage；No. 6 pins：Power supply positive input；No. 8 pins：Shunt resistance
The positive input of device.
Moreover, power filtering capacitor II includes electric capacity C10 and electric capacity C11；Shunt resistance device R9 one end connection INA282
No. 1 pin, the shunt resistance device R9 other end connects INA282 No. 8 pins, electric capacity C10 one end and the one of electric capacity C11
End connection INA282 No. 6 pins, the electric capacity C10 other end and the electric capacity C11 other end are grounded respectively.
Moreover, low-pass filter circuit II includes resistance R10 and electric capacity C9, resistance R10 one end connection INA282 No. 5 pipes
Pin, the resistance R10 other end is connected with electric capacity C9 one end, and as output level pin, the electric capacity C9 other end is grounded.
The method for carrying out power detection using the detecting system described in the present embodiment is as follows, and power detection module passes through numeral
The power measured is converted into relevant voltage signal and is sent to single-chip microcomputer by signal output part, and single-chip microcomputer is according to the magnitude of voltage meter of acquisition
Calculate the power of radiofrequency signal；Single-chip microcomputer is according to the magnitude of voltage of acquisition, according to relational expression：VOUT1=X × VSLOPE/dB×20×log
(VIN/VINTERCEPT), calculate the performance number of radiofrequency signal；Wherein X is proportionality coefficient, VOUT1For output level value, VSLOPE/dB=-
25mV/dB,VINIt is the performance number of radiofrequency signal, VINTERCEPT=7dBV；
Resulting tables of data is shown in Table 1 when carrying out power detection to system based on above-mentioned detection method
Table 1
The data according to table 1, the power detection curve map of drafting are as shown in figure 4, during the changed power of radiofrequency signal, work(
The output voltage of rate detecting system changes therewith, completes power detection.
The method for carrying out current detecting using the detecting system described in the present embodiment is as follows, and current detection module passes through numeral
The operating current for the system that measures is converted into relevant voltage signal and is sent to single-chip microcomputer by signal output part, and single-chip microcomputer is according to acquisition
The operating current of magnitude of voltage computing system；
Single-chip microcomputer is according to the magnitude of voltage of acquisition, according to relational expression：VOUT2=kI × R, the operating current of computing system, wherein
VOUT2For output level value, k is proportionality coefficient, and I is the operating current of system, and R is shunt resistance device resistance.
R=100m Ω in this actual measurement example, it is resulting when table 2 is based on above-mentioned measuring method to system progress power detection
Tables of data.
Table 2
| Current value (A) | Output level value (V) |
| 0.35 | 1.748 |
| 0.36 | 1.795 |
| 0.37 | 1.842 |
| 0.38 | 1.893 |
| 0.39 | 1.948 |
The data according to table 2, the current detecting curve map of drafting are as shown in figure 5, during the operating current change of system, electricity
The output level of stream detecting system changes therewith, completes current detecting.
It should be appreciated that the part that this specification is not elaborated belongs to prior art.
Although describing embodiment of the present utility model, those of ordinary skill in the art above in association with accompanying drawing
It should be appreciated that these are merely illustrative of, various deformation or modification can be made to these embodiments, without departing from this practicality
New principle and essence.Scope of the present utility model is only limited by the claims that follow.
Claims (7)
1. a kind of power and current detecting system based on ionosonde, including single-chip microcomputer, radiofrequency signal, its feature exist
In, in addition to power detection module, current detection module and the display module being connected with single-chip microcomputer；
The power detection module includes π type attenuation networks circuit, impedance matching circuit, power-sensing circuit, LPF electricity
Road I；The π types attenuation network circuit input end is connected with radiofrequency signal, and output end is connected with the input of impedance matching circuit,
The output end of the impedance matching circuit is connected with power-sensing circuit input, the output end of the power-sensing circuit and institute
The input for stating low-pass filter circuit I is connected, and the output end of the low-pass filter circuit I is connected with single-chip microcomputer；
The current detection module includes current detection circuit, low-pass filter circuit II and shunt resistance device R9；The electric current inspection
The input of slowdown monitoring circuit is connected in circuit by shunt resistance device R9, the output end and LPF of the current detection circuit
Circuit I I input is connected, and the output end of the low-pass filter circuit II is connected with the single-chip microcomputer.
2. power and current detecting system as claimed in claim 1 based on ionosonde, it is characterised in that the π
Type attenuation network circuit includes resistance R1, resistance R2, resistance R3, and the radiofrequency signal connects resistance R1 and resistance R2 one end,
Resistance R2 other end connection resistance R3 one end, the resistance R1 other ends, the R3 other end are grounded respectively.
3. power and current detecting system as claimed in claim 2 based on ionosonde, it is characterised in that the work(
Rate detection circuit includes power detection chip A1 and power filtering capacitor I, the power detection chip A1 use AD8318；It is described
Power filtering capacitor I includes electric capacity C3, electric capacity C4, electric capacity C5, electric capacity C6；One end of the electric capacity C3 and electric capacity C4 one end connect
Connect No. 4 pins of the AD8318, electric capacity C3 and electric capacity the C4 other end are grounded respectively；Electric capacity C5 one end and the one of electric capacity C6
The end connection AD8318 No. 9 pins, the electric capacity C5 other end and the electric capacity C6 other end are grounded respectively.
4. power and current detecting system as claimed in claim 3 based on ionosonde, it is characterised in that the resistance
Anti- match circuit includes resistance R4, electric capacity C1, electric capacity C2, electric capacity C8；One end connection electric capacity C1 of resistance R4 one end, electricity
One end of the other end and electric capacity C2 that hinder R4 is grounded respectively, and the other end of the electric capacity C1 connects No. 14 pipes of the AD8318
Pin, the other end of the electric capacity C2 connects No. 15 pins of the AD8318, and one end of the electric capacity C8 connects the AD8318
No. 5 pins, electric capacity C8 the other end ground connection.
5. power and current detecting system as claimed in claim 4 based on ionosonde, it is characterised in that described low
Bandpass filter circuit I includes resistance R8 and electric capacity C7, the resistance R8 one end connection AD8318 No. 6 pins, the electricity
R8 other end connection electric capacity C7 one end is hindered, and as output level pin, the other end of the electric capacity C7 is grounded.
6. power and current detecting system as claimed in claim 1 based on ionosonde, it is characterised in that the electricity
Current detection circuit includes current detecting chip A2 and power filtering capacitor II；The current detecting chip A2 uses INA282；Institute
Stating power filtering capacitor II includes electric capacity C10 and electric capacity C11；One end of the shunt resistance device R9 connects the 1 of the INA282
Number pin, the other end of the shunt resistance device R9 connects No. 8 pins of the INA282；One end of the electric capacity C10 and electricity
The one end for holding C11 connects No. 6 pins of the INA282, and the other end of the electric capacity C10 and the electric capacity C11 other end connect respectively
Ground.
7. power and current detecting system as claimed in claim 6 based on ionosonde, it is characterised in that described low
Bandpass filter circuit II includes resistance R10 and electric capacity C9, the resistance R10 one end connection INA282 No. 5 pins, resistance
The R10 other end is connected with electric capacity C9 one end, and as output level pin, the other end of the electric capacity C9 is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720211080.4U CN206515391U (en) | 2017-03-06 | 2017-03-06 | A kind of power and current detecting system based on ionosonde |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720211080.4U CN206515391U (en) | 2017-03-06 | 2017-03-06 | A kind of power and current detecting system based on ionosonde |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206515391U true CN206515391U (en) | 2017-09-22 |
Family
ID=59869881
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720211080.4U Expired - Fee Related CN206515391U (en) | 2017-03-06 | 2017-03-06 | A kind of power and current detecting system based on ionosonde |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206515391U (en) |
-
2017
- 2017-03-06 CN CN201720211080.4U patent/CN206515391U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104569902B (en) | Digital type electric energy meter power consumption measuring device and method | |
| CN202486253U (en) | Electric leakage detecting circuit and device thereof | |
| CN207440174U (en) | A kind of conductance instrument | |
| CN205353210U (en) | It is applicable in internal resistance of cell on -line monitoring device of multiple battery type | |
| CN102200558A (en) | Starting-up/shutdown detection circuit | |
| CN206497149U (en) | A kind of novel microwave signal power detection module | |
| CN207180902U (en) | A kind of high precision temperature acquisition circuit | |
| CN202600064U (en) | Long-distance real-time online detector for lightning arrester | |
| CN204630969U (en) | Measure the device of soil moisture content and temperature | |
| CN203811663U (en) | Wireless current detection unit used for electricity larceny prevention | |
| CN206515391U (en) | A kind of power and current detecting system based on ionosonde | |
| CN109962871A (en) | ASK amplitude-modulated signal envelope detected system | |
| CN108536070A (en) | A kind of shelf depreciation and temperature detection integral intelligent instrument | |
| CN104330762B (en) | Line fault detection circuit for current transformer | |
| CN206650677U (en) | A kind of fault monitoring device of continuous wave radiofrequency signal and impulse modulation radiofrequency signal | |
| CN110441704A (en) | Battery detection circuit | |
| CN206364810U (en) | A kind of radio-frequency power test device | |
| CN105281190B (en) | A kind of radio-frequency power supply for laser | |
| CN206892258U (en) | It is a kind of to be automatically reminded to circuit and the partial discharge of transformer diagnosis and examining system with the circuit | |
| CN107192896A (en) | Measurement apparatus for High voltage power frequence electric field | |
| CN206559372U (en) | Examination hall is wirelessly practised fraud signal supervisory instrument | |
| CN109655663A (en) | A kind of S-band power-sensing circuit with more gain detection amplification modes | |
| CN206990685U (en) | Measurement apparatus for High voltage power frequence electric field | |
| CN207924056U (en) | Insulator leakage current monitors system | |
| CN207020247U (en) | A kind of RF signal power detection means |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170922 Termination date: 20180306 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |