CN103163380A - 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 comings and goings of engineering, scientific research and production practices, the measurement of micro-phm level electric resistance (contact resistance between the dynamic and static contact of isolating switch, conductor resistance etc.), 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 theory and method mainly contain: direct current constant flow method, direct-flow double bridge method, heavy current pulse current method etc.Various traditional little resistance detection instruments have been made based on these methods, but there is following shortcoming in these methods: the DC-method measuring accuracy is low, bridge method complex operation, direct reading, for many be not allow to add very large measurement electric current by micrometer resistance, large electric current can damage measured device or set off an explosion etc.
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.The concept of virtual instrument (Virtual-instruments, VI) is proposed at first by American National instrument company (NI), and is the same with traditional instrument, and it can be divided into data acquisition, the large functional module of result three is processed, shown in data analysis.The maximum characteristics of virtual instrument are that computer resource is combined with instrument hardware, share software and hardware resources in system.Based on virtual instrument in the advantage aspect data acquisition, analysis, storage, the present invention uses the LabVIEW programming, adopt AC constant-current source and software cross-correlation detection method to measure little resistance, designed a cover micro-phm level electric resistance measuring system, suppress noise and recover to extract the useful signal ability strong, further improve the measuring accuracy of little resistance, have measure easy and simple to handle, reading is directly perceived, automatic analysis screening and judgement, storage playback function.Can be widely used in the occasions such as factory, research institute, laboratory.
Summary of the invention
The present invention is directed in the electronic surveying field and how small resistance (contact resistance between the dynamic and static contact of isolating switch, conductor resistance rate etc.) is accurately measured this technical matters, and the deficiencies in the prior art, propose a kind of micro-phm level electric resistance measuring system based on the LabVIEW platform, system is comprised of hardware and software two parts.Hardware is comprised of AC constant-current source, derived reference signal, low-noise preamplifier, data collecting card, direct supply, computing machine etc.; The LabVIEW analysis software is comprised of with measurement module and software filtering module, cross-correlation module, Data Post program man-machine interface program, collection control.System adopts virtual instrument cross-correlation detection technology, realized the effective measurement to micro-phm level electric resistance, consist of flexible in programming convenient, succinct efficient, suppress noise and recover to extract that the useful signal ability is strong, accuracy of measurement and resolution is high, the Extraordinary automatic measurement system of stable performance, have real-time demonstration, automatic analysis screening and judgement, storage 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 comprised 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 interpretation software system is comprised 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 attached software package thereof.
The output current that AC constant-current source produces is by testing resistance, produces weak voltage signals at testing resistance two ends, after this weak voltage signals amplifies by low-noise preamplifier again the first analog input channel by data collecting card gather 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 the 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; The second analog input channel by data collecting card gathers to computing machine on the other hand; 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 gathers to computing machine through data collecting card, and system completes the resistance measurement for the treatment of micrometer resistance by LabVIEW cross-correlation analysis process software.Wherein, data acquisition module is realized the control function in data acquisition; The LabVIEW digital filtering module carries out bandpass filtering to the output signal of low-noise preamplifier and the reference voltage signal of derived reference signal generation; The reference voltage signal that the output signal of the low-noise preamplifier of LabVIEW cross-correlation module after to bandpass filtering and derived reference signal produce carries out cross-correlation detection and correction, obtains the measurement result of testing resistance; The Data Post module is carried out aftertreatment to the measurement result of testing resistance, realizes demonstration, storage and playback function.
In above-mentioned micro-phm level electric resistance measuring system based on the 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, seven grades of 1000mA are adjustable.
Described testing resistance adopts 4 line mensurations to carry out connection, the measuring error of bringing to reduce line drop.Adopt 4 line mensurations to carry out connection, namely adopt two electric current lines, 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, electric current line and slotted line both strictly separate, and consist of separately independent loop.
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: sine 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, simulation output 2 tunnel; Analog input sampling rate: 1MS/s; Analog input resolution: 16.
The present invention utilizes virtual instrument technique, realizes detecting based on the cross-correlation analysis of LabVIEW graphical programming software to feeble signal, reaches the measurement purpose to micro-phm level electric resistance.Correlation analysis is the common method of time-domain signal analysis and processing, has to suppress noise and recover to extract the 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 characteristics make that software programming is flexible, succinct efficient, stable performance, have the functions such as real-time demonstration, storage, playback, be a cover Extraordinary automatic measurement system, these characteristics make the designed micro-phm level electric resistance measuring system based on the LabVIEW development platform of the present invention have certain practical value.
Description of drawings
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 comprised 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 interpretation software system is comprised 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 attached software package thereof.
The output current that AC constant-current source produces is by testing resistance, produces weak voltage signals at testing resistance two ends, after this weak voltage signals amplifies by low-noise preamplifier again the first analog input channel by data collecting card gather 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 the 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; The second analog input channel by data collecting card gathers to computing machine on the other hand; 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 gathers to computing machine through data collecting card, and system completes the resistance measurement for the treatment of micrometer resistance by LabVIEW cross-correlation analysis process software.Wherein, data acquisition module is realized the control function in data acquisition; The LabVIEW digital filtering module carries out bandpass filtering to the output signal of low-noise preamplifier and the reference voltage signal of derived reference signal generation; The reference voltage signal that the output signal of the low-noise preamplifier of LabVIEW cross-correlation module after to bandpass filtering and derived reference signal produce carries out cross-correlation detection and correction, obtains the measurement result of testing resistance; The Data Post module is carried out aftertreatment to the measurement result of testing resistance, realizes demonstration, storage and playback function.
Computing machine is the core of whole test macro, has friendly human-computer interaction interface, it is again the carrier of little resistance test system software, data collecting card assigns on computing machine, add that the application software based on the LabVIEW exploitation consists of the micro-phm level electric resistance test macro, realized the collection Measurement and analysis with the total digitalization of computing machine, had 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 little resistance, AC constant-current source output is connected to the two ends (A, B end in Fig. 1) for the treatment of micrometer resistance, the output current of constant current source is treating that micrometer resistance two ends form stable pressure drop.But owing to treating that the micrometer resistance is little, its two ends output voltage is less, and detected voltage signal is very faint often, and the Noise and Interference of following is very large, so need to 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 that is enough to promote capture card work.The output terminal of amplifier is connected to the analog input end of data collecting card.
The noise that brings for amplifier amplifying signal process, can design low-noise preamplifier or use the way of low noise operational amplifier cascade by employing, make the noise of amplifier compare and to ignore with the noise of detected resistance both end voltage signal, thereby reduce the noise of amplifier to the noise pollution of measured signal generation.But when very weak and impact ground unrest or interference of measured signal was very large, the signal to noise ratio (S/N ratio) that obtains electric signal after amplifying by low-noise preamplifier was very low, and it is inadequate only designing a low-noise preamplifier.At this moment, except the additional noise that requires amplifier to produce is as far as possible little, also to manage and to be mixed in reducing that noise in measured signal tries one's best, in order to from noise, signal (or in signal entrained information) is extracted, this just need to be by the method for some special Detection of Weak Signals, be correlation detection, the present invention realizes by LabVIEW software cross-correlation detection.
AC constant-current source output 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, seven grades of 1000mA are 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 that provides is adjustable, and the signal amplitude after amplifying with testing resistance two ends measuring-signal is suitable.For guaranteeing that signal source frequency is identical with the 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: sine wave; 4) output impedance: 50 Ω.
Testing resistance adopts 4 line mensurations to carry out connection, the measuring error of bringing to reduce line drop.Adopt 4 line mensurations to carry out connection, namely adopt two electric current lines, 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, electric current line and slotted line both strictly separate, and consist of separately independent loop.
The input end of amplifying circuit is connected to treats micrometer resistance C, D end, pre-low-noise amplifier is selected the OP07 integrated package in discharge circuit, its characteristics are 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 the occasions such as stable integration, accurate addition, comparison, threshold voltage detection, the accurate amplification of feeble signal.Amplifier sampling two-stage series connection amplifies, and selects 5 ranges to carry out the measurement of little resistance, changes the enlargement factor of operational amplifier OP07 by K switch 1, K2, and amplifier amplifies 1 times, 10 times, 100 times, 1000 times and 10000 times to input voltage respectively.The selective basis testing resistance of enlargement factor K switch 1, K2 gear and the size of current source current are selected, as Fig. 2.
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 amplification output signal of the output voltage signal of derived reference signal and amplifier is connected respectively to the analog input terminal of data collecting card, gather the output signal of amplifier and the output signal of derived reference signal by data collecting card, be transferred in computing machine, carry out data by LabVIEW cross-correlation analysis process software and process, complete the resistance for the treatment of micrometer resistance and measure.Data collecting card parameter: I/O port number: analog input 4 tunnel, simulation output 2 tunnel; Analog input sampling rate: 1MS/s; Analog input resolution: 16.
The parts such as cross-correlation analysis detection are completed on PC, adopt LabVIEW software programming realization to the processing of little resistance signal.Described LabVIEW Signal cross correlation interpretation software comprises that data acquisition module, LabVIEW digital filtering module, LabVIEW cross-correlation module and Data Post module form, and all forms based on LabVIEW development platform and the research and development of attached software package thereof.Wherein, data acquisition module is realized the control function in data acquisition; The LabVIEW digital filtering module carries out bandpass filtering to the output signal of low-noise preamplifier and the reference voltage signal of derived reference signal generation; The reference voltage signal that the output signal of the low-noise preamplifier of LabVIEW cross-correlation module after to bandpass filtering and derived reference signal produce carries out cross-correlation detection and correction, obtains the measurement result of testing resistance; The Data Post module is carried out aftertreatment to the measurement result of testing resistance, realizes demonstration, storage and playback function.
Realize the detection of signal is called correlation detection technology according to correlation principle, say in essence, coherent detection is based on that statistical property between signal and noise detects.Related function is a kind of tolerance of two time-domain signal similaritys, and it can realize detection signal and reference signal are carried out computing cross-correlation.Utilize reference signal frequency relevant to frequency input signal, uncorrelated with noise frequency, thus extract useful signal from noise.Coherent detection mainly utilizes compression bandwidth, inhibition noise to greatest extent, to reach the purpose that detects feeble signal.
LabVIEW Signal cross correlation interpretation software front panel design 5 input controls: acquisition parameter setting, wave filter setting, zeroing arrange, enlargement factor is selected, electric current is selected.
Collection signal is that the form by waveform shows, adopt Pagination Display to switch between the interface in front panel, be respectively from left to right: contain waveform after noisy collection measuring-signal waveform, measuring-signal are processed through filtering, contain noisy collection reference waveform signal, canonical reference signal waveform after treatment and through the waveform after the cross correlation function analytic operation.
The measured value of little resistance is to show that by numerical value control finds out intuitively.The result of measuring comprises 5 amounts: i.e. the reference signal voltage value that every measurement once obtains, signal frequency, measurement signal voltages value, resistance instantaneous value and the resistance mean value that repeatedly measures.
The program that realizes with LabVIEW software comprise signal input collection, low-pass filter, cross-correlation detection with relevant correction, on average, demonstration, storage, the several parts of playback.
Input signal (measured signal) selects the DAQ assistant in plate to obtain from data collecting card by SignalExpress, and the enlargement factor that " enlargement factor " adjusting knob is used for regulating input signal should be identical with the enlargement factor of hardware amplifying circuit.
The acquisition of reference signal is also to select external reference, makes external reference signal collect system by data collecting card.The adjusting of reference signal is regulated by hardware " reference signal " and is completed, and the amplitude that collects the input signal (measured signal) in computing machine after the reference signal amplitude should be amplified with amplifier is suitable.Reference signal is transformed to the canonical reference signal through processing, and the amplitude of canonical reference signal is 1, and frequency is still identical with input signal.
Sample information comprises the hits of per second sampling rate (Fs) and each sample waveform, and the sample information of reference signal should be consistent with the sample information to measured signal.
Because the voltage at testing resistance two ends is feeble signals and is under larger Noise and Interference environment, or even the signal that is flooded by Noise and Interference, the noise that superposes on prime reply signal is done preliminary filtering and is processed.What filtering was used is the bandpass filter that LabVIEW provides, and can regulate higher cutoff frequency and the low cutoff frequency of filtering by the numerical value input control of front panel, also can regulate type and the exponent number of wave filter in flow chart.What use in system is 7 rank butterworth filters, and input signal is through after filtering, and the low-frequency cycle undesired signal of 50Hz almost completely is eliminated, and noise signal has decay to a certain degree.Reference signal is through after filtering, and the low-frequency cycle undesired signal of 50Hz also almost completely is eliminated.Yet the introducing of wave filter makes the measuring-signal amplitude that to a certain degree decay be arranged, and need to revise this moment.The conversion of input signal is converted to the 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.Simple crosscorrelation VI is arranged in Functions〉Analyze〉Signal Processing〉Time Domain 〉, call the cross correlation function calculating that the CrossCorrelation function carries out discrete series
In actual measurement, can only obtain N the sampled value of signal x (t), so with continuous time signal x (t) and y (t) constant duration △ t sampling value, 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), n=0 wherein, 1,2 ... N-1.
By calling Functions in LabVIEW〉Signal Processing〉Time Domain〉Cross Correlation.vi subtemplate realizes the algorithm of simple crosscorrelation.
In the cross-correlation analysis process of measuring-signal and reference signal, because signal analysis requires to loop, and whole process all wishes it is man-machine interaction, therefore, adopts in the back the While loop structure in the program design of plate.
Used the Bundle icon on the Cluster subtemplate in the cross-correlation analysis process, purpose is that the starting point of figure transverse axis, transverse axis scale division value and cross-correlation function value are combined into an integral body.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.Through after such setting, the attribute of Graph icon is just set by the input parameter of Bundle icon, and horizontal ordinate unit becomes the time by original sampling number.Final Wave data with bunch form provide, comprise zero-time t0, sampling time interval dt and an array that is consisted of by sampled data.
The cross correlation function of two periodic signals of measuring-signal and reference signal remains the periodic signal of same frequency, and has kept the amplitude information of former measuring-signal.If changing the frequency of two sinusoidal signals is different frequency, the periodic signal that can observe two non-same frequencys is uncorrelated mutually.But be a curve that waits the amplitude fading 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 software that segment signal that will intercept is thought null value.Therefore need to be revised when using, correction algorithm is that each correlation to the related function of obtaining in LabVIEW is divided by N-τ.Wherein, N is the length of the related function output group obtained of LabVIEW, and τ is the position of time shift, the number percent that d clips from beginning to end for the output related function, and n is the number of samples after brachymemma.Through after revising, the squiggle of trying to achieve be one comprise measuring-signal information wait the cycle, etc. the curve of amplitude, cycle or frequency are identical with measuring-signal, amplitude also equates with the amplitude of measuring-signal.
Data treated and that calculate show by the display part.Collection signal is that the form by waveform shows, is respectively: contain waveform after noisy collection measuring-signal waveform, measuring-signal are processed through filtering, contain noisy collection reference waveform signal, canonical reference signal waveform after treatment and through the waveform after the cross correlation function analytic operation.
Through the computing of cross correlation function, the measured value of little resistance is to show control output by numerical value.The result of measuring comprises 5 amounts: i.e. reference signal voltage value, signal frequency that every measurement once obtains, measurement signal voltages value, resistance value and the resistance mean value that repeatedly measures.
The tradition lock-in amplifier needs to carry out the minimum low-pass filtering of bandwidth in rear class.What use in native system is that measured value repeatedly is averaged, and the effect of acquisition is with to carry out low-pass filtering similar, controls by controlling the number of times that software cycles measures the number of times that it is averaging required amount, and its numerical value can only be integer.When the number of times that circulates was more, the reaction time was longer, but the value that obtains is more accurate; And when the number of times of circulation more hour, the reaction time is relatively shorter, but the value that obtains has than great fluctuation process.This point is also similar on the impact of low-pass filter with time constant.
It is SaveData.VI that data are preserved submodule, and it is processed into unified form to the data of wanting to preserve, and is saved in when withdrawing from system in text or Excel.
The described collection control of system and measurement module, software filtering module, cross-correlation detection module, relevant correction and average module, demonstration, storage, playback module all form based on LabVIEW development platform and the research and development of attached software package thereof.
The functions such as the described collection control of system and measurement, software filtering, cross-correlation detection, relevant correction, average, demonstration, storage, playback are based on the corresponding function subprogram of LabVIEW development platform utilization (VI) and form.
The present invention utilizes virtual instrument technique, realizes based on the detection of LabVIEW graphical programming software cross-correlation analysis to feeble signal, reaches the measurement purpose to micro-phm level electric resistance.Correlation analysis is the common method of time-domain signal analysis and processing, has to suppress noise and recover to extract the 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 characteristics make that software programming is flexible, succinct efficient, stable performance, have the functions such as real-time demonstration, storage, playback, be a cover Extraordinary automatic measurement system, these characteristics make the designed micro-phm level electric resistance measuring system based on the LabVIEW development platform of 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 comprised 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 interpretation software system is comprised 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 attached software package thereof;
The output current that AC constant-current source produces is by testing resistance, produces weak voltage signals at testing resistance two ends, after this weak voltage signals amplifies by low-noise preamplifier again the first analog input channel by data collecting card gather 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 the 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; The second analog input channel by data collecting card gathers to computing machine on the other hand; 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 gathers to computing machine through data collecting card, and system completes the resistance measurement for the treatment of micrometer resistance by LabVIEW cross-correlation analysis process software; Wherein, data acquisition module is realized the control function in data acquisition; The LabVIEW digital filtering module carries out bandpass filtering to the output signal of low-noise preamplifier and the reference voltage signal of derived reference signal generation; The reference voltage signal that the output signal of the low-noise preamplifier of LabVIEW cross-correlation module after to bandpass filtering and derived reference signal produce carries out cross-correlation detection and correction, obtains the measurement result of testing resistance; The Data Post module is carried out aftertreatment to the measurement result of testing resistance, realizes demonstration, storage and playback function.
2. the micro-phm level electric resistance measuring system based on the 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, seven grades of 1000mA are adjustable.
3. the micro-phm level electric resistance measuring system based on the LabVIEW development platform according to claim 1, is characterized in that, described testing resistance adopts 4 line mensurations to carry out connection, the measuring error of bringing to reduce line drop; Adopt 4 line mensurations to carry out connection, namely adopt two electric current lines, 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, electric current line and slotted line both strictly separate, and consist of separately independent loop.
4. the micro-phm level electric resistance measuring system based on the LabVIEW development platform according to claim 1, it is characterized in that, 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.
5. the micro-phm level electric resistance measuring system based on the LabVIEW development platform according to claim 4, is characterized in that, pre-low-noise amplifier is selected the OP07 integrated package in discharge circuit.
6. the micro-phm level electric resistance measuring system based on the 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: sine wave; 4) output impedance: 50 Ω.
7. the micro-phm level electric resistance measuring system based on the 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 the LabVIEW development platform according to claim 1, is characterized in that, described data collecting card parameter: I/O port number: analog input 4 tunnel, simulation output 2 tunnel; Analog input sampling rate: 1MS/s; Analog input resolution: 16.
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| CN115372408A (en) * | 2022-08-08 | 2022-11-22 | 东南大学 | Automatic 3 omega test system and method based on bridge and data acquisition card |
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