CN207440159U - A kind of novel portable signal tester - Google Patents
A kind of novel portable signal tester Download PDFInfo
- Publication number
- CN207440159U CN207440159U CN201720541481.6U CN201720541481U CN207440159U CN 207440159 U CN207440159 U CN 207440159U CN 201720541481 U CN201720541481 U CN 201720541481U CN 207440159 U CN207440159 U CN 207440159U
- Authority
- CN
- China
- Prior art keywords
- signal
- electrically connected
- control unit
- circuit
- analog multiplier
- 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
- 238000000034 method Methods 0.000 claims abstract description 12
- 230000006698 induction Effects 0.000 claims abstract description 11
- 238000013519 translation Methods 0.000 claims abstract description 7
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims abstract description 6
- 238000012545 processing Methods 0.000 claims description 3
- 241000208340 Araliaceae Species 0.000 claims 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 claims 1
- 235000003140 Panax quinquefolius Nutrition 0.000 claims 1
- 235000008434 ginseng Nutrition 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 4
- 230000035945 sensitivity Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The utility model discloses a kind of novel portable signal testers, it is related to tester technical field；The reference signal generation unit generates the reference signal identical with power frequency to be measured and is divided into two-way：Input analog multiplier all the way, all the way through AC DC translation circuits be transformed to direct current signal in order to control unit ADC provide reference voltage；The induction coil is electrically connected with advance signal process circuit, the advance signal process circuit is electrically connected with analog multiplier, the analog multiplier is electrically connected with low-pass filter circuit, the low-pass filter circuit is connected with the ADC of control unit, and described control unit is electrically connected with display unit；The utility model is easy to carry, and can realize accurate measurement, easy to use, easy to operate, efficient.
Description
Technical field
The utility model is related to a kind of novel portable signal testers, belong to tester technical field.
Background technology
Existing contactless weak current system usually has the following disadvantages：Accuracy of detection is not high enough, existing non-to connect
Touch current detecting system is usually applicable only to the detection of high current, the special core current sense only based on current transformer
Device（Such as the mono- nanocrystalline magnet core of Fe, Cu, Nb, Si, B）The detection of mA grades of electric currents can be achieved；Complex process, usually using special material
Manufactured sensor；There is limitation in sensing station, usually require that conductor to be measured passes through the center of sensor, therefore with certain
Use limitation.
Utility model content
In view of the above-mentioned problems, the technical problem to be solved by the present invention is to provide a kind of novel portable signal testings
Instrument.
A kind of novel portable signal tester of the utility model, it include induction coil, reference signal generation unit,
Advance signal process circuit, analog multiplier, AC-DC translation circuits, low-pass filter circuit, control unit, display unit；It is described
Reference signal generation unit generates the reference signal identical with power frequency to be measured and is divided into two-way：Analog multiplier is inputted all the way,
All the way through AC-DC translation circuits be transformed to direct current signal in order to control unit ADC provide reference voltage；The induction coil is with before
Signal processing circuit electric connection is put, the advance signal process circuit is electrically connected with analog multiplier, the analogue multiplication
Device and low-pass filter circuit are electrically connected, and the low-pass filter circuit is connected with the ADC of control unit, described control unit with
Display unit is electrically connected.
Preferably, the induction coil is made of coil and skeleton.
Compared with prior art, the beneficial effects of the utility model are：It is easy to carry, and can realize accurate measurement, it uses
It is convenient, it is easy to operate, it is efficient.
Description of the drawings
For ease of explanation, the utility model is described in detail by following specific implementations and attached drawing.
Fig. 1 is the structure diagram of the utility model；
Fig. 2 is the instrumentation plan of the utility model；
Fig. 3 is the circuit diagram of low-pass filter circuit in the utility model；
Fig. 4 is the flow chart of the utility model；
Fig. 5 is the schematic diagram that phase amplifying circuit is locked in the utility model.
Specific embodiment
To make the objectives, technical solutions and advantages of the present invention clearer, below by showing in attached drawing
Specific embodiment describes the utility model.However, it should be understood that these descriptions are merely illustrative, and it is not intended to limit this reality
With new scope.In addition, in the following description, the description to known features and technology is omitted, to avoid unnecessarily mixing
Confuse the concept of the utility model.
As shown in Figs. 1-5, present embodiment uses following technical scheme：It includes induction coil, reference signal is given birth to
It is single into unit, advance signal process circuit, analog multiplier, AC-DC translation circuits, low-pass filter circuit, control unit, display
Member；The reference signal generation unit generates the reference signal identical with power frequency to be measured and is divided into two-way：Input simulation all the way
Multiplier, all the way through AC-DC translation circuits be transformed to direct current signal in order to control unit ADC provide reference voltage；The sensing
Coil is electrically connected with advance signal process circuit, and the advance signal process circuit is electrically connected with analog multiplier, described
Analog multiplier is electrically connected with low-pass filter circuit, and the low-pass filter circuit is connected with the ADC of control unit, the control
Unit processed is electrically connected with display unit.By multiplier and ADC, measured signal is multiplied with reference signal, and AC signal is filtered
It removes, direct current signal is sampled and is converted into digital signal and exported and shown under control unit control.
The induction coil is made of coil and skeleton；The effect of skeleton is support coil and electromagnetic damping.In order to reduce
Electromagnetic damping is brought non-linear, using plastic skeleton.Coil is coiled into enameled wire by coil winding machine.The number of turn of induction coil is got over
More, sensitivity is higher, and distribution capacity is bigger, therefore uses the number of turn of circular coil as 200 circles, a diameter of 0.22mm of enameled wire.
In order to reduce the requirement to straight wire length to be measured, coil diameter should be made as far as possible small；Coil generate induced electromotive force with it is hollow
Coil is directly proportional perpendicular to the sectional area of the magnetic line of force, therefore it is about Φ=8.16mm to select internal coil diameter, outer diameter be about Φ=
14.27mm；In order to which the magnetic line of force for making current induced magnetic field passes perpendicularly through coil plane as far as possible, there is higher sensitivity, should make
Coil thickness is as far as possible small, and it is about 1cm to select coil thickness.
The main function of the advance signal process circuit is that preliminary amplification and preliminary is carried out to the signal of sensor output
High frequency, low-frequency noise are filtered out, entering lock phase amplifying circuit for signal prepares.Due to system be non-contact measurement, useful letter
It number is obtained according to electromagnetic induction principle by induction coil, impedance is low and stablizes, therefore the pre-amplification circuit of system is simultaneously
There need not be very high input impedance.Advance signal process circuit mainly includes preamplifier and bandpass filter, this two
Partial circuit is realized by operational amplifier LF347.
The purpose of filtering is noise and the interference of inhibition and useful signal different frequency, is allowed to be reduced to the journey of work permission
Degree improves signal-to-noise ratio.RC active filters are made of active device, resistance R and capacitance C, its main feature is that loss is small, performance is good,
It is small.
The type of equation design wave filter includes：Voltage controlled voltage source type filter circuit, the filter of unlimited gain multiple feedback type
Wave circuit and double second order loop filter circuits.Voltage controlled voltage source type filter circuit by active device property desired level influenced compared with
It is small, it is simple in structure；But its high sensitivity, and it is directly proportional to quality factor q, then circuit performance is easily influenced by external condition,
When working under critical condition, self-oscillation is also easy to produce.Unlimited gain multiple feedback type filter circuit stability is high；But to active device
Part characteristic requirements are high, and open-loop gain can be substantially reduced when signal frequency is higher, then quality factor q does not allow excessively high.Double two
Rank loop circuit circuit performance stablize, sensitivity is low, and sensitivity not with the variation of circuit gain, quality factor or centre frequency and
Variation, therefore allow high Q values.
The selection of filter circuit configuration：With higher Q values while in order to make circuit performance excellent, and sensitivity compared with
It is low, double second order loop circuits are selected as filter circuit.Double second order loop circuits are illustrated in figure 3, three-level illustrated circuit is connected, it can
Realize the wave filter of 6 ranks.Wherein, the centre frequency f of every grade of circuit0=50k Hz, gain KP=10。
The selection of wave filter active device：Circuit signal to be processed is disturbed high frequency weak signal, useful signal
The sinusoidal signal that frequency is 50kHz or so, amplitude is several millivolts~tens millivolts, therefore it is required that operational amplifier have it is wide
Bandwidth and suitable input/output bound；LF347N is a low-power consumption of National Semiconductor's production, high speed, junction type field effect
Should pipe input operational amplifier.Its unity gain bandwidth is 4MHz, input impedance 10M, input bias current and noise
Electric current is low, and total harmonic distortion is small, and settling time is fast.The amplifier uses both end power supplying, it is made to work in ± 15V supply voltages.It is full
Sufficient wave filter design requirement, by each device, circuit diagram connects into thtee-stage shiplock form as shown in Figure 3, is sent out with HG1630A type functions
It is 40kHz~60kHz sinusoidal signals that raw device, which generates frequency, and u is observed with DS3062M types digital oscilloscope0(t) output waveform, can
Obtain the bandpass filter amplitude versus frequency characte.The bandpass filter for measuring visible design is about 100 to the gain of 50kHz AC signals
Times, the requirement of estimated quality factor is basically reached, to the attenuation of 46kHz and 54.5kHz signals up to 20dB, meeting design will
It asks.
Further, the analogue amplifier is lock phase amplifying circuit, locks principle such as Fig. 5 institutes of phase amplifying circuit
Show.
The operation principle of present embodiment is：When one timing of circuit system structure, turn number N, coil section product
S, gain coefficient K1、K2, L and ADC precision n can be considered constant, for the signal of fixed frequency, electricity is handled by advance signal
Displacement caused by road is also certain value, when one timing of detection coil and the relative distance of conducting wire to be measured, systematic survey and electricity to be measured
It is directly proportional to flow amplitude, it is unrelated with the absolute size of reference signal amplitude.It can be seen that using system proportional measuring method, with warp
Reference signal after conversion provides ADC reference voltages, can effectively reduce by reference signal amplitude fluctuations and the fluctuation of ADC reference voltages
The measurement error of introducing.The system of design to be 50kHz to frequency, the faint alternating current that amplitude is several milliamperes of zero point exists
It is effectively detected in the range of certain space.
The standardized element that the utility model uses can commercially, shaped piece according to specification and attached drawing
Record can carry out customized, the specific connection mode of each part is using bolt ripe in the prior art, rivet, weldering
It connects and waits conventional means, machinery, part and equipment use in the prior art, conventional model, in addition circuit connection is using existing
Conventional connection mode in technology, this will not be detailed here.
It is obvious to a person skilled in the art that the utility model is not limited to the details of above-mentioned exemplary embodiment, and
And in the case of the spirit or essential attributes without departing substantially from the utility model, it can realize that this practicality is new in other specific forms
Type.Therefore, in all respects, the present embodiments are to be considered as illustrative and not restrictive, this practicality is new
The scope of type is indicated by the appended claims rather than the foregoing description, it is intended that will fall containing in the equivalent requirements of the claims
All changes in justice and scope are embraced therein.Any reference numeral in claim should not be considered as limitation
Involved claim.
Moreover, it will be appreciated that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
Using specification as an entirety, the technical solutions in each embodiment can also be properly combined, forms those skilled in the art
It is appreciated that other embodiment.
Claims (2)
1. a kind of novel portable signal tester, it is characterised in that：It includes induction coil, reference signal generation unit, preceding
Put signal processing circuit, analog multiplier, AC-DC translation circuits, low-pass filter circuit, control unit, display unit；The ginseng
It examines the signal generation unit generation reference signal identical with power frequency to be measured and is divided into two-way：Input analog multiplier all the way, one
Road through AC-DC translation circuits be transformed to direct current signal in order to control unit ADC provide reference voltage；The induction coil with it is preposition
Signal processing circuit is electrically connected, and the advance signal process circuit is electrically connected with analog multiplier, the analog multiplier
It is electrically connected with low-pass filter circuit, the low-pass filter circuit is connected with the ADC of control unit, and described control unit is with showing
Show that unit is electrically connected.
2. a kind of novel portable signal tester according to claim 1, it is characterised in that：The induction coil is by line
Circle and skeleton composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720541481.6U CN207440159U (en) | 2017-05-16 | 2017-05-16 | A kind of novel portable signal tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720541481.6U CN207440159U (en) | 2017-05-16 | 2017-05-16 | A kind of novel portable signal tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207440159U true CN207440159U (en) | 2018-06-01 |
Family
ID=62394949
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720541481.6U Expired - Fee Related CN207440159U (en) | 2017-05-16 | 2017-05-16 | A kind of novel portable signal tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207440159U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113125883A (en) * | 2021-03-30 | 2021-07-16 | 中国科学院国家空间科学中心 | Performance test system and method for third-order digital correlator |
-
2017
- 2017-05-16 CN CN201720541481.6U patent/CN207440159U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113125883A (en) * | 2021-03-30 | 2021-07-16 | 中国科学院国家空间科学中心 | Performance test system and method for third-order digital correlator |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Ripka | Electric current sensors: a review | |
| CN103575960B (en) | giant magnetoresistance effect current sensor | |
| CN106018942B (en) | It is a kind of for measuring the current sensor array and measurement method of three-phase current | |
| CN107315150B (en) | Orthogonal fundamental mode fluxgate sensor | |
| Grosz et al. | Analytical optimization of low-frequency search coil magnetometers | |
| US8729886B2 (en) | Device for measuring alternating current magnetic susceptibility and method of measuring the same | |
| CN202614920U (en) | Magnetic sensor based on giant magneto-impedance phase response | |
| CN113341211B (en) | Fluxgate current sensor and measuring method thereof | |
| JP2014173980A (en) | Magnetic measuring apparatus | |
| CN111256865A (en) | TMR-based dual-frequency excitation magnetic nano temperature measurement method | |
| Chen et al. | A power sensor tag with interference reduction for electricity monitoring of two-wire household appliances | |
| CN104849679A (en) | Magnetic probe and magnetic field sensor having same | |
| KR20220118437A (en) | High-precision, non-invasive current sensor system | |
| CN202066953U (en) | Magnetic sensor | |
| CN203535102U (en) | Colossal magnetoresistance effect current sensor | |
| CN207440159U (en) | A kind of novel portable signal tester | |
| Liu et al. | Design and implementation of a tuning-matching framework for a high-sensitivity broad band proton precession magnetometer sensing coil | |
| CN107884838A (en) | A kind of magnetic electric compound material base magnetic field sensor with sensitivity | |
| CN101923152B (en) | Room temperature calibration method for equivalent error area of gradiometer | |
| Ripka et al. | Tuned current-output fluxgate | |
| Riveros et al. | Design, implementation and experimental characterisation of a high sensitivity GMI gradiometer with an interference compensation system | |
| CN209147918U (en) | It is a kind of to send a reception differential type current vortex displacement detection device | |
| Yang et al. | A new digital single-axis fluxgate magnetometer according to the cobalt-based amorphous effects | |
| Wang et al. | Bio-magnetic sensor circuit design based on giant magneto-impedance effect | |
| Qi et al. | A Novel Tunneling Magnetoresistive Current Sensor Based on Reference Magnetic Field Source |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180601 Termination date: 20190516 |