CN103163380B - Micro-ohm resistance measurement system based on LabVIEW developing platform - Google Patents
Micro-ohm resistance measurement system based on LabVIEW developing platform Download PDFInfo
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Abstract
The invention provides a micro-ohm resistance measurement system based on a LabVIEW platform and aims to solve the technical problem that low resistance (contact resistance between a movable contact and a static contact of a circuit breaker, a lead resistance and the like) is inaccurately measured in the field of electronic measurement. The system comprises hardware and software, wherein the hardware consists of an alternating current constant current source, a reference signal source, a low-noise pre-amplifier, a data acquisition card, a direct current power supply and a computer; and the software consists of a data acquisition control module, a LabVIEW digital filtering module, a LabVIEW cross correlation module and a data postprocessing module. According to the system, a virtual instrument cross correlation detection technology is adopted, so that the micro-ohm resistance is effectively measured; a personalized automatic measurement system which is flexibly and conveniently programmed, concise and high-efficiency, inhibits noise and has high useful signal recovery and extraction capability, measurement accuracy and resolution and stable performance is built; and the system has real-time displaying, storage and playback functions.
Description
Technical field
The invention belongs to electronic measuring technology field, relate to micro-phm level electric resistance measuring system and method.
Background technology
In the various activities of engineering, scientific research and production practices, the measurement of micro-phm level electric resistance (contact resistance, conductor resistance etc. between the dynamic and static contact of isolating switch), for energy-saving and emission-reduction, the aspects such as the safe and stable operation of raising electric system and economic benefit have very important significance, and meet the requirement of following intelligent grid.Traditional micro-ohm resistance detection Theories and methods mainly contains: direct current constant flow method, direct-flow double bridge method, heavy current pulse current method etc.Various traditional micro-resistance detection instrument has been made based on these methods, but there is following shortcoming in these methods: DC-method measuring accuracy is low, bridge method complex operation, can not direct reading, for many be do not allow to add very large measurement electric current by micrometer resistance, big current can damage measured device or set off an explosion.
In recent years, along with the fast development of computer technology, electronic technology, the communication technology, Computerized Information Processing Tech, traditional instrument forward software implementation, digitizing and virtual future development.Virtual instrument (Virtual-instruments, VI) concept is proposed at first by National Instruments (NI), the same with traditional instrument, it can be divided into data acquisition, Data Analysis Services, display result three zones module.The maximum feature of virtual instrument is combined with instrument hardware by computer resource, in system, share software and hardware resources.Based on the advantage of virtual instrument in data acquisition, analysis, storage, the present invention uses LabVIEW to programme, AC constant-current source and software cross-correlation detection method is adopted to measure micro-resistance, devise a set of micro-phm level electric resistance measuring system, it is strong that useful signal ability is extracted in restraint speckle and recovery, improves the measuring accuracy of micro-resistance further, has measurement easy and simple to handle, reading is directly perceived, automatic analysis screening and judge, store playback function.The occasions such as factory, research institute, laboratory can be widely used in.
Summary of the invention
The present invention is directed in electronic surveying field and how this technical matters is accurately measured to Minitype resistance (contact resistance between the dynamic and static contact of isolating switch, conductor resistance rate etc.), and the deficiencies in the prior art, propose a kind of micro-phm level electric resistance measuring system based on LabVIEW platform, system is made up of hardware and software two parts.Hardware is made up of AC constant-current source, derived reference signal, low-noise preamplifier, data collecting card, direct supply, computing machine etc.; LabVIEW analysis software is controlled to form with measurement module and software filtering module, cross-correlation module, Data Post program by man-machine interface program, collection.System adopts virtual instrument cross-correlation detection technology, achieve the effective measurement to micro-phm level electric resistance, form that convenient, succinct efficient, the restraint speckle of flexible in programming and recovery extract that useful signal ability is strong, accuracy of measurement and resolution is high, the automatic measurement system of the personalization of stable performance, there is real-time display, automatic analysis screening and judge, store playback function.
Technical solution of the present invention is as follows:
Based on the micro-phm level electric resistance measuring system of LabVIEW development platform, comprise resistance signal detection hardware system and LabVIEW cross-correlation analysis process software system two parts.Resistance signal detection hardware system is made up of AC constant-current source, derived reference signal, testing resistance, low-noise preamplifier, data collecting card, direct supply and computing machine.LabVIEW signal cross-correlation analysis process software system is made up of data acquisition module, LabVIEW digital filtering module, LabVIEW cross-correlation module and Data Post module, all forms based on LabVIEW development platform and the research and development of accompanying software bag thereof.
The output current that AC constant-current source produces by testing resistance, produces weak voltage signals at testing resistance two ends, this weak voltage signals after being amplified by low-noise preamplifier again by the first analog input channel collection of data collecting card to computing machine; The reference voltage signal that derived reference signal produces is input to AC constant-current source on the one hand, to control the electric current output frequency of AC constant-current source, makes reference voltage signal frequency identical with the electric current output frequency of AC constant-current source; The reference voltage signal that derived reference signal produces; Pass through the second analog input channel collection of data collecting card on the other hand to computing machine; Direct supply provides operating voltage to low-noise preamplifier.
The reference voltage signal that the output signal of low-noise preamplifier and derived reference signal produce, after data collecting card collection to computing machine, is completed by LabVIEW cross-correlation analysis process software system and treats that the resistance of micrometer resistance is measured.Wherein, data acquisition module realizes the controlling functions in data acquisition; LabVIEW digital filtering module carries out bandpass filtering to the reference voltage signal that the output signal of low-noise preamplifier and derived reference signal produce; LabVIEW cross-correlation module carries out cross-correlation detection and correction to the reference voltage signal that the output signal of the low-noise preamplifier after bandpass filtering and derived reference signal produce, and obtains the measurement result of testing resistance; Data Post module carries out aftertreatment to the measurement result of testing resistance, realizes display, stores and playback function.
Above-mentioned based in the micro-phm level electric resistance measuring system of LabVIEW development platform:
Described AC constant-current source the key technical indexes: 1) output range: 1mA ~ 1000mA; 2) frequency range: 100Hz ~ 10KHz is adjustable; 3) constant-current accuracy: ± 1%; 4) gear: 1mA, 5mA, 10mA, 50mA, 100mA, 500mA, 1000mA seven grades is adjustable.
Described testing resistance adopts 4 line mensurations to carry out connection, to reduce the measuring error that line drop brings.4 line mensurations are adopted to carry out connection, namely two current line are adopted, AC constant-current source is connected to the two ends of testing resistance, adopt two slotted lines, respectively the weak voltage signals at resistance two ends is connected to two input ends of low noise amplifier, both current line and slotted line strictly separate, and form independent loop separately.
Described low noise amplifier sampling two-stage is amplified, enlargement factor K1 or K2 be 1 times, 10 times or 100 times adjustable, whole enlargement factor K=K1 × K2 be 1 times, 10 times, 100 times, 1000 times or 10000 times adjustable.
Described derived reference signal the key technical indexes: 1) output level: 0 ~ 5V is adjustable; 2) frequency range: 100Hz ~ 10KHz is adjustable; 3) waveform: sinusoidal wave; 4) output impedance: 50 Ω.
Described DC power output voltage: ± 9V; Output current: 200mA; Ripple :≤10mV.
Described data collecting card parameter: I/O port number: analog input 4 tunnel, modulating output 2 tunnel; Analog input sampling rate: 1MS/s; Analog input resolution: 16.
The present invention utilizes virtual instrument technique, realizes detecting the cross-correlation analysis of feeble signal based on LabVIEW graphical programming software, reaches the measurement object to micro-phm level electric resistance.Correlation analysis is the common method of time-domain signal analysis and process, has restraint speckle and recover to extract useful signal ability strong, accuracy of measurement and resolution advantages of higher.Related measuring system based on LabVIEW has good specificity, interlinking and portability, it takes full advantage of the power of computing machine, its graphic user interface development function and flexibly feature make flexible, succinct efficient, the stable performance of software programming, there is the functions such as real-time display, storage, playback, be the automatic measurement system of a set of personalization, these features make the micro-phm level electric resistance measuring system based on LabVIEW development platform designed by the present invention have certain practical value.
Accompanying drawing explanation
Fig. 1 is hardware system block diagram of the present invention.
Fig. 2 is low-noise preamplifier schematic diagram of the present invention.
Embodiment
Below in conjunction with Figure of description, the present invention is described in further detail.
Based on the micro-phm level electric resistance measuring system of LabVIEW development platform, comprise resistance signal detection hardware system and LabVIEW cross-correlation analysis process software system two parts.Resistance signal detection hardware system is made up of AC constant-current source, derived reference signal, testing resistance, low-noise preamplifier, data collecting card, direct supply and computing machine.LabVIEW signal cross-correlation analysis process software system is made up of data acquisition module, LabVIEW digital filtering module, LabVIEW cross-correlation module and Data Post module, all forms based on LabVIEW development platform and the research and development of accompanying software bag thereof.
The output current that AC constant-current source produces by testing resistance, produces weak voltage signals at testing resistance two ends, this weak voltage signals after being amplified by low-noise preamplifier again by the first analog input channel collection of data collecting card to computing machine; The reference voltage signal that derived reference signal produces is input to AC constant-current source on the one hand, to control the electric current output frequency of AC constant-current source, makes reference voltage signal frequency identical with the electric current output frequency of AC constant-current source; The reference voltage signal that derived reference signal produces; Pass through the second analog input channel collection of data collecting card on the other hand to computing machine; Direct supply provides operating voltage to low-noise preamplifier.
The reference voltage signal that the output signal of low-noise preamplifier and derived reference signal produce, after data collecting card collection to computing machine, is completed by LabVIEW cross-correlation analysis process software system and treats that the resistance of micrometer resistance is measured.Wherein, data acquisition module realizes the controlling functions in data acquisition; LabVIEW digital filtering module carries out bandpass filtering to the reference voltage signal that the output signal of low-noise preamplifier and derived reference signal produce; LabVIEW cross-correlation module carries out cross-correlation detection and correction to the reference voltage signal that the output signal of the low-noise preamplifier after bandpass filtering and derived reference signal produce, and obtains the measurement result of testing resistance; Data Post module carries out aftertreatment to the measurement result of testing resistance, realizes display, stores and playback function.
Computing machine is the core of whole test macro, there is friendly human-computer interaction interface, it is again the carrier of micro-resistance test system software, data collecting card assigns on computing machine, add that the application software based on LabVIEW exploitation forms micro-phm level electric resistance test macro, achieve the collection Measurement and analysis with the total digitalization of computing machine, have that software and hardware resources is abundant, extendability is strong, measuring accuracy is high, easy to operate, cost performance advantages of higher.
Adopt AC constant-current source to measure micro-resistance, AC constant-current source is exported the two ends (in Fig. 1 A, B end) being connected to and treating micrometer resistance, the output current of constant current source is treating that micrometer resistance two ends form stable pressure drop.But little owing to treating micrometer resistance, its two ends output voltage is less, detected voltage signal is very faint often, and adjoint Noise and Interference is very large, so need amplify voltage to be measured by low-noise preamplifier.The weak voltage signals at resistance two ends is connected to the input end of low-noise preamplifier by C, D end, amplify this weak voltage signals by amplifier, the effect of low-noise preamplifier is that the noisy weak voltage signals of companion is amplified to the level being enough to promote capture card work.The output terminal of amplifier is connected to the analog input end of data collecting card.
For the noise that amplifier amplifies signals process is brought, can by adopting the way of design low-noise preamplifier or the cascade of utilization low noise operational amplifier, the noise of amplifier can be ignored compared with the noise of detected resistance both end voltage signal, thus the noise pollution that the noise reducing amplifier produces measured signal.But when when measured signal is very weak, the impact of ground unrest or interference is very large, the signal to noise ratio (S/N ratio) obtaining electric signal after being amplified by low-noise preamplifier is very low, it is inadequate for only designing a low-noise preamplifier.At this moment, except the additional noise produced except requiring amplifier is little as far as possible, also to manage the reduction of being tried one's best by the noise be mixed in measured signal, signal (or information entrained in signal) is extracted from noise, this just needs the method by some special Detection of Weak Signals, i.e. correlation detection, the present invention is realized by LabVIEW software cross-correlation detection.
AC constant-current source export have seven grades adjustable, adjust the gear of output current according to the resistance of testing resistance.This accurate AC constant-current source the key technical indexes: 1) output range: 1mA ~ 1000mA; 2) frequency range: 100Hz ~ 10KHz is adjustable; 3) constant-current accuracy: ± 1%; 4) gear: 1mA, 5mA, 10mA, 50mA, 100mA, 500mA, 1000mA seven grades is adjustable.
Derived reference signal provides a reference voltage signal, and this reference signal is identical with the electric current output frequency of AC constant-current source, and the voltage magnitude of the reference signal provided is adjustable, and signal amplitude after amplifying with testing resistance two ends measuring-signal is suitable.For ensureing that signal source frequency is identical with AC constant-current source frequency, control AC constant-current source with the output of signal source, the output of derived reference signal is connected to the other analog input end of data collecting card.The key technical indexes of this signal source: 1) output level: 0 ~ 5V is adjustable; 2) frequency range: 100Hz ~ 10KHz is adjustable; 3) waveform: sinusoidal wave; 4) output impedance: 50 Ω.
Testing resistance adopts 4 line mensurations to carry out connection, to reduce the measuring error that line drop brings.4 line mensurations are adopted to carry out connection, namely two current line are adopted, AC constant-current source is connected to the two ends of testing resistance, adopt two slotted lines, respectively the weak voltage signals at resistance two ends is connected to two input ends of low noise amplifier, both current line and slotted line strictly separate, and form independent loop separately.
The input end of amplifying circuit is connected to treats that micrometer resistance C, D hold, pre-low-noise amplifier selects the OP07 integrated package in discharge circuit, the occasions such as its feature is as follows: OP07 is a kind of Low-offset operational amplifier with low maladjustment voltage, low offset current and low drift, and it is widely used in stable integration, accurate addition, compares, threshold voltage detects, feeble signal is accurately amplified.Amplifier sampling two-stage series connection amplifies, and select 5 ranges to carry out the measurement of micro-resistance, changed the enlargement factor of operational amplifier OP07 by K switch 1, K2, amplifier amplifies 1 times, 10 times, 100 times, 1000 times and 10000 times to input voltage respectively.The selection of enlargement factor K switch 1, K2 gear is selected, as Fig. 2 according to the size of testing resistance and current source current.
Direct supply is connected on low-noise preamplifier, for amplifier circuit provides power supply.DC power output voltage: ± 9V; Output current: 200mA; Ripple :≤10mV.
Data collecting card is assigned on computers, the output voltage signal of derived reference signal and the amplification output signal of amplifier are connected respectively to the analog input terminal of data collecting card, the output signal of amplifier and the output signal of derived reference signal is gathered by data collecting card, be transferred in computing machine, carry out data processing by LabVIEW cross-correlation analysis process software, complete and treat that the resistance of micrometer resistance is measured.Data collecting card parameter: I/O port number: analog input 4 tunnel, modulating output 2 tunnel; Analog input sampling rate: 1MS/s; Analog input resolution: 16.
The part such as cross-correlation analysis detection completes on PC, adopts the process of LabVIEW software programming realization to micro-resistance signal.Described LabVIEW signal cross-correlation analysis process software comprises data acquisition module, LabVIEW digital filtering module, LabVIEW cross-correlation module and Data Post module composition, all forms based on LabVIEW development platform and the research and development of accompanying software bag thereof.Wherein, data acquisition module realizes the controlling functions in data acquisition; LabVIEW digital filtering module carries out bandpass filtering to the reference voltage signal that the output signal of low-noise preamplifier and derived reference signal produce; LabVIEW cross-correlation module carries out cross-correlation detection and correction to the reference voltage signal that the output signal of the low-noise preamplifier after bandpass filtering and derived reference signal produce, and obtains the measurement result of testing resistance; Data Post module carries out aftertreatment to the measurement result of testing resistance, realizes display, stores and playback function.
Realize being called correlation detection technology to the detection of signal according to correlation principle, essentially, coherent detection carries out detecting based on the statistical property between signal and noise.Related function is the one tolerance of two time-domain signal similaritys, and it can realize carrying out computing cross-correlation to detection signal and reference signal.Utilize reference signal frequency relevant to frequency input signal, uncorrelated with noise frequency, thus useful signal is extracted from noise.Coherent detection mainly utilizes compression bandwidth, restraint speckle to greatest extent, to reach the object detecting feeble signal.
LabVIEW signal cross-correlation analysis process software front panel design 5 input controls: acquisition parameter is arranged, wave filter is arranged, zeroing is arranged, enlargement factor is selected, electric current is selected.
Collection signal is shown by the form of waveform, Pagination Display is adopted to switch between interface in front panel, from left to right respectively: the waveform after processing after filtering containing noisy collection measuring-signal waveform, measuring-signal, containing noisy collection reference waveform signal, standard reference signal waveform after treatment and the waveform after cross correlation function analytic operation.
The measured value of micro-resistance is found out intuitively by numerical value display control.The result measured comprises 5 amounts: namely often measure the resistance mean value that the reference signal voltage value, signal frequency, measurement signal voltages value, resistance instantaneous value and the repetitive measurement that once obtain obtain.
With the program of LabVIEW software simulating comprise signal input collections, low-pass filter, cross-correlation detection are revised to relevant, on average, show, store, the several part of playback.
Input signal (measured signal) selects the DAQ assistant in plate to obtain from data collecting card by SignalExpress, and " enlargement factor " adjusting knob is used for regulating the enlargement factor of input signal, should be identical with the enlargement factor of hardware amplifying circuit.
The acquisition of reference signal is also select external reference, makes external reference signal collect system by data collecting card.The adjustment of reference signal has been regulated by hardware " reference signal ", and reference signal amplitude collects the input signal (measured signal) in computing machine amplitude after should amplifying with amplifier is suitable.Reference signal is transformed to standard reference signal through process, and the amplitude of standard reference signal is 1, and frequency is still identical with input signal.
Sample information comprises the hits of sampling rate per second (Fs) and each sample waveform, and the sample information of reference signal should be consistent with to the sample information of measured signal.
Because the voltage at testing resistance two ends is feeble signal and under being in larger Noise and Interference environment, or even by the signal that Noise and Interference floods, the noise that prime reply signal superposes does preliminary filtering process.The bandpass filter that filtering uses LabVIEW to provide, the numerical value input control by front panel regulates the higher cutoff frequency of filtering and low cutoff frequency, also can regulate type and the exponent number of wave filter in flow chart.Use 7 rank butterworth filters in system, input signal after filtering after, the low-frequency cycle undesired signal of 50Hz is almost eliminated completely, and noise signal has decay to a certain degree.Reference signal after filtering after, the low-frequency cycle undesired signal of 50Hz is also almost eliminated completely.But the introducing of wave filter makes measuring-signal amplitude have decay to a certain degree, now needs to revise.The conversion of input signal is converted to double-precision array form by dynamic mode.
The function of the cross-correlation analysis of measuring-signal and reference signal is provided by the time-domain analysis template in LabVIEW.Cross-correlation VI is arranged in Functions>Analyze>Signal Processing>Time Domain>, calls the cross correlation function calculating that CrossCorrelation function carries out discrete series
In actual measurement, N number of sampled value of signal x (t) can only be obtained, so by continuous time signal x (t) and y (t) constant duration △ t sampling value, then time t=n △ t, time delay τ=m △ t (m=0,1,2, N-1), obtain signal x (t) and y (t) discrete-time series x (n △ t) and y (n △ t), be abbreviated as x (n) and y (n), wherein n=0,1,2 ... N-1.
The algorithm of cross-correlation is realized by calling Functions>Signal Processing>Time Domain>Cross Correlation.vi subtemplate in LabVIEW.
In the cross-correlation analysis process of measuring-signal and reference signal, because signal analysis requires that circulation is carried out, and all desirably man-machine interaction of whole process, therefore, below plate program design in adopt While loop structure.
Used the Bundle icon on Cluster subtemplate in cross-correlation analysis process, object is that the starting point of figure transverse axis, transverse axis scale division value and cross-correlation function value are combined into an entirety.Bundl figure indicates three input quantities: first transverse axis starting point; It two is scale division values of transverse axis, and it is by the inverse of sample frequency, and namely sampling interval decides; It three is the cross-correlation function value that will show, i.e. ordinate value.After such setting, the attribute of Graph icon is just set by the input parameter of Bundle icon, and abscissa unit becomes the time from original sampling number.Final Wave data with bunch form provide, comprise initial time t0, a sampling time interval dt and array be made up of sampled data.
The cross correlation function of two periodic signals of measuring-signal and reference signal remains the periodic signal of same frequency, and remains the amplitude information of former measuring-signal.If the frequency changing two sinusoidal signals is different frequency, can observe that the periodic signal of two non-same frequencys is uncorrelated mutually.But be a curve waiting the amplitude decay in cycle with the squiggle that cross correlation function Cross Correlation.vi in LabVIEW software tries to achieve.Reason is in the process of data acquisition, and the time T of each data acquisition is finite value, and namely the part outside that segment signal intercepted is thought null value by software.Therefore need to be revised when applying, correction algorithm is divided by N-τ to each correlation of the related function obtained in LabVIEW.Wherein, N is the length of the related function output group that LabVIEW obtains, and τ is the position of time shift, and d is the number percent that output related function head and the tail are clipped, and n is the number of samples after brachymemma.After revising, the squiggle of trying to achieve be one comprise measuring-signal information wait the cycle, etc. the curve of amplitude, the cycle or frequency identical with measuring-signal, amplitude is also equal with the amplitude of measuring-signal.
Data that are treated and that calculate are shown by display section.Collection signal is shown by the form of waveform, respectively: the waveform after processing after filtering containing noisy collection measuring-signal waveform, measuring-signal, containing noisy collection reference waveform signal, standard reference signal waveform after treatment and the waveform after cross correlation function analytic operation.
Through the computing of cross correlation function, the measured value of micro-resistance is exported by numerical value display control.The result measured comprises 5 amounts: namely often measure the reference signal voltage value, the signal frequency that once obtain, the resistance mean value that measurement signal voltages value, resistance value and repetitive measurement obtain.
Tradition lock-in amplifier need carry out the minimum low-pass filtering of bandwidth in rear class.Use in native system and be averaged repetitive measurement value, the effect of acquisition is with to carry out low-pass filtering similar, and the number of times measured by control software design circulation controls the number of times that it is averaging required amount, and its numerical value can only be integer.When the number of times circulated is more, the reaction time is longer, but the value obtained is more accurate; And when circulation number of times more hour, the reaction time is relatively shorter, but the value obtained has larger fluctuation.This point is also similar on the impact of low-pass filter with time constant.
Data preserve submodule and SaveData.VI, and it is processed into unified form wanting the data of preserving, and is saved in text or Excel when system exits.
Collection control described in system and measurement module, software filtering module, cross-correlation detection module, relevantly to revise and averaging module, display, storage, playback module, all form based on LabVIEW development platform and the research and development of accompanying software bag thereof.
Collection described in system controls with measurement, software filtering, cross-correlation detection, relevantly to revise, on average, show, store, the function such as playback, utilize corresponding function subprogram (VI) to be formed based on LabVIEW development platform.
The present invention utilizes virtual instrument technique, to realize based on LabVIEW graphical programming software cross-correlation analysis, to the detection of feeble signal, reaching the measurement object to micro-phm level electric resistance.Correlation analysis is the common method of time-domain signal analysis and process, has restraint speckle and recover to extract useful signal ability strong, accuracy of measurement and resolution advantages of higher.Related measuring system based on LabVIEW has good specificity, interlinking and portability, it takes full advantage of the power of computing machine, its graphic user interface development function and flexibly feature make flexible, succinct efficient, the stable performance of software programming, there is the functions such as real-time display, storage, playback, be the automatic measurement system of a set of personalization, these features make the micro-phm level electric resistance measuring system based on LabVIEW development platform designed by the present invention have certain practical value.
Claims (8)
1., based on the micro-phm level electric resistance measuring system of LabVIEW development platform, comprise resistance signal detection hardware system and LabVIEW cross-correlation analysis process software system two parts; Resistance signal detection hardware system is made up of AC constant-current source, derived reference signal, testing resistance, low-noise preamplifier, data collecting card, direct supply and computing machine; LabVIEW cross-correlation analysis process software system is made up of data acquisition module, LabVIEW digital filtering module, LabVIEW cross-correlation module and Data Post module, all forms based on LabVIEW development platform and the research and development of accompanying software bag thereof;
The output current that AC constant-current source produces by testing resistance, produces weak voltage signals at testing resistance two ends, this weak voltage signals after being amplified by low-noise preamplifier again by the first analog input channel collection of data collecting card to computing machine; The reference voltage signal that derived reference signal produces is input to AC constant-current source on the one hand, to control the electric current output frequency of AC constant-current source, makes reference voltage signal frequency identical with the electric current output frequency of AC constant-current source; The reference voltage signal that derived reference signal produces passes through the second analog input channel collection of data collecting card on the other hand to computing machine; Direct supply provides operating voltage to low-noise preamplifier;
The reference voltage signal that the output signal of low-noise preamplifier and derived reference signal produce is after data collecting card collection to computing machine, and the resistance being completed testing resistance by LabVIEW cross-correlation analysis process software system is measured; Wherein, data acquisition module realizes the controlling functions in data acquisition; LabVIEW digital filtering module carries out bandpass filtering to the reference voltage signal that the output signal of low-noise preamplifier and derived reference signal produce; LabVIEW cross-correlation module carries out cross-correlation detection and correction to the reference voltage signal that the output signal of the low-noise preamplifier after bandpass filtering and derived reference signal produce, and obtains the measurement result of testing resistance; Data Post module carries out aftertreatment to the measurement result of testing resistance, realizes display, stores and playback function.
2. the micro-phm level electric resistance measuring system based on LabVIEW development platform according to claim 1, is characterized in that, described AC constant-current source the key technical indexes: 1) output range: 1mA ~ 1000mA; 2) frequency range: 100Hz ~ 10KHz is adjustable; 3) constant-current accuracy: ± 1%; 4) gear: 1mA, 5mA, 10mA, 50mA, 100mA, 500mA, 1000mA seven grades is adjustable.
3. the micro-phm level electric resistance measuring system based on LabVIEW development platform according to claim 1, is characterized in that, described testing resistance adopts 4 line mensurations to carry out connection, to reduce the measuring error that line drop brings; 4 line mensurations are adopted to carry out connection, namely two current line are adopted, AC constant-current source is connected to the two ends of testing resistance, adopt two slotted lines, respectively the weak voltage signals at resistance two ends is connected to two input ends of low-noise preamplifier, both current line and slotted line strictly separate, and form independent loop separately.
4. the micro-phm level electric resistance measuring system based on LabVIEW development platform according to claim 1, it is characterized in that, described low-noise preamplifier adopts two-stage to amplify, enlargement factor K1 or K2 be 1 times, 10 times or 100 times adjustable, whole enlargement factor K=K1 × K2 be 1 times, 10 times, 100 times, 1000 times or 10000 times adjustable.
5. the micro-phm level electric resistance measuring system based on LabVIEW development platform according to claim 4, is characterized in that, the OP07 integrated package in discharge circuit selected by low-noise preamplifier.
6. the micro-phm level electric resistance measuring system based on LabVIEW development platform according to claim 1, is characterized in that, described derived reference signal the key technical indexes: 1) output level: 0 ~ 5V is adjustable; 2) frequency range: 100Hz ~ 10KHz is adjustable; 3) waveform: sinusoidal wave; 4) output impedance: 50 Ω.
7. the micro-phm level electric resistance measuring system based on LabVIEW development platform according to claim 1, is characterized in that, described DC power output voltage: ± 9V; Output current: 200mA; Ripple :≤10mV.
8. the micro-phm level electric resistance measuring system based on LabVIEW development platform according to claim 1, is characterized in that, described data collecting card parameter: I/O port number: analog input 4 tunnel, modulating output 2 tunnel; Analog input sampling rate: 1MS/s; Analog input resolution: 16.
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