CN205982429U - Virtual instrument's laboratory impedance measuring device - Google Patents
Virtual instrument's laboratory impedance measuring device Download PDFInfo
- Publication number
- CN205982429U CN205982429U CN201620935488.1U CN201620935488U CN205982429U CN 205982429 U CN205982429 U CN 205982429U CN 201620935488 U CN201620935488 U CN 201620935488U CN 205982429 U CN205982429 U CN 205982429U
- Authority
- CN
- China
- Prior art keywords
- impedance
- microprocessor
- conversion
- laboratory
- measurement
- 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
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The utility model relates to a virtual instrument's laboratory impedance measuring device, be connected through two port RAM and bus interface by microprocessor, microprocessor is through the encoded control, address accumulator and clock generator are connected with the crystal oscillator, the switch is changed with AD respectively, the encoded control, the phase sensitivity detection, the storage of drive signal wave form and impedance / vector voltage conversion connect, the phase sensitivity detection is through low pass filter a, AD conversion and latch are connected with microprocessor, the address accumulator is saved through the drive signal wave form, DA conversion and low pass filter b and impedance / vector voltage conversion are connected the constitution. It can be to inductance, electric capacity, resistance components and parts parameter measurement, measurement accuracy height to compare with current impedance measuring instrument, measuring range is wide, can independently select drive signal's voltage, frequency, selects suitable standard resistance, adopt phase sensitivity detection module to with frequency signal mirror looks, do not measure real part and the imaginary component of being surveyed the impedance respectively, have than strong anti -interference nature, can realize the rapid survey.
Description
Technical field
This utility model is related to a kind of measurement apparatus of electronic devices and components, especially relates to the impedance measurement dress of virtual instrument
Put it is adaptable to laboratory teaching and application.
Background technology
With the raising of electronic science and technology, people are to electronic product required precision more and more higher.Most electricity on the market
Sub- product is all to be made up of most basic electronic devices and components, mainly includes resistance, electric capacity, inductance.Wherein, impedance is components and parts
Intrinsic most basic characteristic, therefore during improving electronic product precision, the measurement of impedance is just particularly important.Separately
Outward, under different signal frequencies and level, its performance and index all can be affected components and parts.Therefore, we design realization
A kind of laboratory impedance measurement device, can be while measuring component parameter, and the composition of reflection components and parts and electrically has
Help the experimentation of laboratory, the research to high precision instrument is very helpful.
CN201583595U discloses " RCL element or its component equivalent impedometer " and adopts bridge method to realize to first device
The measurement of part parameter is although high precision, but measuring circuit is complicated, and bridge balance regulating time is long, is difficult to realize quick measurement；
CN203606434U is disclosed " impedance measuring circuit " and is combined with phase sensitive detection using single-chip microcomputer, by by impedance
Be converted to voltage to measure, its circuit structure is simple, but complex operation, need to calculate frequency range in advance, have certain
Limitation；
CN102175921A disclose " a kind of portable impedance measurement instrument based on FPGA " by impedance be divided into real part and
Imaginary part measures, and reduces the difficulty of measurement, but measurement process is complicated, needs the size selection standard electricity according to tested impedance
Resistance is it is impossible to enough realize automatic measurement.
Content of the invention
The purpose of this utility model is that for the deficiencies in the prior art, provides one kind to be applied to laboratory teaching and answer
The laboratory impedance measurement device of virtual instrument
The purpose of this utility model is achieved through the following technical solutions：
Design philosophy is to set by the way of FPGA and DDS frequency synthesis technique is combined with the voltammetry in impedance measurement
The virtual laboratory impedance measurement device that meter is realized.
The laboratory impedance measurement device of virtual instrument, is to be connected with EBI through dual port RAM by microprocessor, micro- place
The reason decoded control of device, address accumulator and clock generator are connected with crystal oscillator, switch respectively with A/D conversion, encoded control, phase
Quick detection, excitation signal waveforms storage and impedance/vector voltage conversion connect, phase sensitive detection low-pass filtered a, A/D conversion and
Latch is connected with microprocessor, and address accumulator is connected with phase sensitive detection through reference signal waveform storage, address accumulator warp
Excitation signal waveforms storage, D/A conversion and low-pass filtering b are connected with impedance/vector voltage conversion, and microprocessor is occurred with clock
Device connects and composes.
Beneficial effect：This utility model is virtual instrument with the combination of analog hardware circuit it is adaptable to laboratory research, work
The virtual impedance measuring system of industry fields of measurement.Have the characteristics that compared with existing impedance measuring Instrument：1. can be effective
The parameter to inductance, electric capacity, resistance element measure, and the combination parameter of inductance, electric capacity, resistance can be surveyed
Amount, and there is higher certainty of measurement, its certainty of measurement is ± 0.5%.2. measurement range is wide, can independently select pumping signal
Voltage, frequency, select suitable measuring resistance；Also above parameter can be arranged as required to, contribute to laboratory research components and parts
Performance and frequency, voltage between relation.3. adopt phase sensitive detection module to same frequency signal phase demodulation, respectively to tested impedance
Real part and imaginary part measure respectively, there is stronger anti-interference, be capable of quickly measuring.4. this device is using virtual
The visualization Display panel of instrument controller unit, simple to operate, and certainty of measurement is high, can change measurement bar according to measurement requirement
Part, has wide range of applications.
Brief description
Fig. 1 is the laboratory impedance measurement device structured flowchart of virtual instrument.
Fig. 2 is impedance/vector voltage change-over circuit figure.
Specific embodiment
With reference to the accompanying drawings and examples this utility model is described in further detail,
The laboratory impedance measurement device of virtual instrument, as shown in figure 1, be to be connect with bus through dual port RAM by microprocessor
Mouthful connect, the decoded control of microprocessor, address accumulator and clock generator be connected with crystal oscillator, switch change with A/D respectively,
Encoded control, phase sensitive detection, excitation signal waveforms storage and impedance/vector voltage conversion connect, and phase sensitive detection is low-pass filtered
A, A/D conversion and latch are connected with microprocessor, and address accumulator is connected with phase sensitive detection through reference signal waveform storage, ground
Location accumulator stores through excitation signal waveforms, D/A conversion and low-pass filtering b are connected with impedance/vector voltage conversion, microprocessor
Connect and compose with clock generator.
This impedance measurement device mainly uses microprocessor to be passed through dual port RAM IDT7130 and realizes and the connecing of system bus
Mouthful, and the communication with system controller module is realized by interrupt mechanism.The initialization that system is responsible for by microprocessor includes to double
Mouth RAM write enters configuration information, setting circuit original state, and processes the order that bus sends over, and controls corresponding circuit list
Unit.Its signal generator module mainly includes clock generator, address accumulator, waveform data memory, low-pass filtering and D/A
Conversion, the signal of generation is as pumping signal and reference signal.Need the voltage of measurement when obtaining after impedance inverter circuit
After signal, this voltage signal is multiplied by phase-sensitive detector with reference signal, by vector voltage be separated into two groups be projected in respectively 0 °,
90 ° and 180 °, the component on 360 ° of coordinate axess, vector voltage are carried out the separation of real part and imaginary part, reach the purpose of phase demodulation.Again
Convert analog signals into digital signal after Filtering Processing, and data is uploaded in upper layer data storehouse.Finally, utilize
LabVIEW software is programmed, and realizes to the process of data and the design of display interface.
Virtual impedance laboratory measurement device is the measurement by voltammetry realization to impedance, and its principle is by detected element
Connect with standard component, identical by their electric current, measure the voltage of detected element and standard component two ends, fixed by ohm
Rule obtains the resistance value of detected element.Because impedance is vector, need during measurement and modern computer technology phase
In conjunction with the difficulty in computation of reduction vector division, thus reach the purpose of quick measurement.The system is mainly by signal source module, survey
Amount circuit module, data processing module data display module are constituted.
Signal source module is mainly used to produce pumping signal and reference signal, and wherein pumping signal is mainly used to produce impedance
Pumping signal required for vector voltage conversion and the vector voltage signal after conversion, reference signal is as the voltage after conversion
A reference source with phase-sensitive detector.This module mainly includes address accumulator, reference signal waveform memorizer, excitation signal waveforms
The parts such as memorizer, D/A change-over circuit, filter circuit.Wave memorizer stores sinusoidal wave form data, address accumulator controls ripple
Reference signal required for shape memorizer output circuit and pumping signal, are easy to the measurement of follow-up measuring circuit.
Impedance measurement is mainly converted to vector voltage measurement by measuring circuit module, and its schematic diagram is as shown in Figure 2.In figure U0
For pumping signal, ZxFor measured piece, ZsFor measuring resistance, in order to expand measurement range, improve overall certainty of measurement, its acceptance of the bid
Quasi- part be chosen as tri- gears of 20 Ω, 1k, 50k.By measuring the voltage U at measured piece two endsx, standard component both end voltage Us, lead to
Cross Ohm's law definition can obtain：
Formula (1) is also denoted as：
Due to ZsFor standard component, its value is it is known that only need to measure UxReal part and imaginary part U1、U2And UsReal part and imaginary part
U3、U4Can be obtained by tested impedance Zx.
Data processing module includes data communication, phase sensitive detection, A/D conversion, Filtering Processing etc..
Virtual impedance laboratory measurement device is to realize data communication using system bus, is adopted by contrasting us
Rmc system bus, while reduces cost, meets overall functional requirement.Because tested voltage is vector, in order to reduce
The real part of vector voltage and imaginary part are carried out separating by the difficulty in computation of vector division using phase sensitive detection.Through phase-sensitive detector
Voltage after process needs A/D converter to be converted to digital signal for analog quantity, is processed by filtering etc. and can avoid interference
The error causing.
Data disaply moudle mainly includes the calling of built-in function, the design of virtual controlling display interface, flow chart design three
Part.The transmission of data, internal system setting, realization of systemic-function etc. are realized by calling of built-in function.Work as data transfer
During to software, need data is processed, be easy to show, what the data after processing was capable of precise sharpness is shown in display
On interface.Virtual controlling shows there is good human-computer interaction interface, meets the requirement of measurement.
Claims (1)
1. a kind of laboratory impedance measurement device of virtual instrument is it is characterised in that be through dual port RAM and bus by microprocessor
Interface connects, and the decoded control of microprocessor, address accumulator and clock generator are connected with crystal oscillator, and switch is turned with A/D respectively
Change, encoded control, phase sensitive detection, excitation signal waveforms storage and impedance/vector voltage conversion connect, phase sensitive detection is through low pass filtered
Ripple a, A/D conversion and latch are connected with microprocessor, and address accumulator is connected with phase sensitive detection through reference signal waveform storage,
Address accumulator stores through excitation signal waveforms, D/A conversion and low-pass filtering b are connected with impedance/vector voltage conversion, microprocessor
Device is connected and composed with clock generator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620935488.1U CN205982429U (en) | 2016-08-25 | 2016-08-25 | Virtual instrument's laboratory impedance measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620935488.1U CN205982429U (en) | 2016-08-25 | 2016-08-25 | Virtual instrument's laboratory impedance measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205982429U true CN205982429U (en) | 2017-02-22 |
Family
ID=58035117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620935488.1U Expired - Fee Related CN205982429U (en) | 2016-08-25 | 2016-08-25 | Virtual instrument's laboratory impedance measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205982429U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109040938A (en) * | 2018-08-24 | 2018-12-18 | 上海飞灵信息科技有限公司 | A kind of the electricity performance measurement analyzer and management platform of portable acoustic transducer |
| CN109342820A (en) * | 2018-11-23 | 2019-02-15 | 南京理工大学 | A kind of contact impedance test macro |
| CN110123320A (en) * | 2019-05-13 | 2019-08-16 | 南京航空航天大学 | A kind of portable frequency sweep impedance bioelectrical measurement system and its measurement method |
-
2016
- 2016-08-25 CN CN201620935488.1U patent/CN205982429U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109040938A (en) * | 2018-08-24 | 2018-12-18 | 上海飞灵信息科技有限公司 | A kind of the electricity performance measurement analyzer and management platform of portable acoustic transducer |
| CN109342820A (en) * | 2018-11-23 | 2019-02-15 | 南京理工大学 | A kind of contact impedance test macro |
| CN110123320A (en) * | 2019-05-13 | 2019-08-16 | 南京航空航天大学 | A kind of portable frequency sweep impedance bioelectrical measurement system and its measurement method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205982429U (en) | Virtual instrument's laboratory impedance measuring device | |
| CN104965009B (en) | A kind of Hydrogen Concentration Detector | |
| CN201837683U (en) | High-precision alternating-current impedance testing device | |
| CN102621491A (en) | Motor parameter detector | |
| CN106526332A (en) | System and method for detecting capacitor of scanning line of capacitive touch screen | |
| CN201909811U (en) | Three-phase watt-hour meter based on MSP430 singlechip | |
| CN106249038A (en) | A kind of General portable far-end high-power rudder electromechanics pressure, current measurement and calibrating installation | |
| CN206400004U (en) | The single-phase 3 line intelligent electric meter of high current | |
| CN202522693U (en) | Device for detecting measure accuracy degree of electric energy meter | |
| CN202494744U (en) | Device for detecting quality of electric energy | |
| CN202794284U (en) | Multifunctional intelligent electric power meter | |
| CN205643688U (en) | Single -phase electric energy meter detection device | |
| CN203433041U (en) | An electric energy meter provided with a communication function | |
| CN102608560A (en) | Detection device for measuring accuracy of electric energy meter | |
| CN203204073U (en) | Digital phase-difference measuring instrument | |
| CN203909178U (en) | Multifunctional digital electric power meter | |
| CN203414503U (en) | Self-checking adapter of automatic detection system based on PXI bus | |
| CN202948052U (en) | Digital voltammeter based on measuring chip | |
| CN203249733U (en) | Hydraulic indicator error checking device | |
| CN219085040U (en) | Transformer capacity tester | |
| CN2821570Y (en) | Electromechanical integrated detector for digital weak electrolyte dissociation constant | |
| CN203894403U (en) | Multifunctional electric energy meter calibrating and control device | |
| CN209198519U (en) | A kind of simple digital multimeter that experimental teaching is applicable | |
| CN203084038U (en) | Circular single-phase LCD (Liquid Crystal Display) watt-hour meter | |
| CN204882712U (en) | Electric wire netting harmonic electric energy measuring device based on DSP |
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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170222 Termination date: 20170825 |