CN105021881A - High precision wide range current and voltage grading measure method - Google Patents
High precision wide range current and voltage grading measure method Download PDFInfo
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- CN105021881A CN105021881A CN201510465243.7A CN201510465243A CN105021881A CN 105021881 A CN105021881 A CN 105021881A CN 201510465243 A CN201510465243 A CN 201510465243A CN 105021881 A CN105021881 A CN 105021881A
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Abstract
The invention discloses a high precision wide range current and voltage grading measure method, which belongs to the measure field of weak current and voltage signal. The invention provides the high precision measure method for wide range signals that can't be realized in prior art. In the invention, n current and voltage sensors that have different measuring ranges and different precision are used to measure the same signal to be measured; the n current and voltage sensors are used to measure the signal to be measured according to measure precision order from low to high; the primary sensor that has large measuring range and low precision is used to measure first and the accurate part of the result is taken; then the determined accurate part of the actually measured signal is compensated through a current and voltage reference source and the residual signals are used for next grade measuring until the sensor that has the minimum measuring range and the highest precision is used for measuring; the data is fused, so that the high precision measurement of signals that have heavy current and large voltage in week field is realized.
Description
Technical field
The invention belongs to the fields of measurement of light current electric current, voltage signal, the field of high-precision measurement of particularly suitable big current, large voltage signal.
Background technology
In the current-voltage measurement field of current weak electric signal, the instrument such as multimeter, current measuring instrument is generally adopted to measure.These traditional surveying instruments, due to the restriction by measurement mechanism and device performance, cannot take into account range and precision, as accurately measured pA rank to amplitude more than the current signal of 1A simultaneously.And in fields of measurement, it is very necessary for realizing the high-precision current voltage detecting of this " amplitude " signal.
Through examination pertinent literature, Chinese Patent Application No.: 201410521569.2, patent name: a kind of high precision electric current transducer testing circuit and detection method thereof.A kind of the first current sensor and having by having relatively large journey of this Patent design forms compared with the second current sensor of small-range and ADC converter, the method uses sensors of large measurement range, uses small-range sensor when small magnitude signal when amplitude signal, cannot carry out high-acruracy survey to wide range signal.
Chinese invention patent application number: 201410182909.3, patent name is: a kind of high precision electro current detection circuit and apply the current-limiting apparatus of this circuit, a kind of high precision electro current detection circuit of this patented invention comprises device under test, amplifier and load and detects electric current, but cannot detect big current signal.
Summary of the invention
The present invention seeks to the problem that cannot complete the high-acruracy survey work of wide range signal in order to solve prior art, providing a kind of classification measuring method of high precision and large measuring range current/voltage.
The classification measuring method of high precision and large measuring range current/voltage of the present invention, the method utilizes n different range, the current/voltage sensor of different accuracy is measured same measured signal; And n current/voltage sensor is undertaken sorting by measuring accuracy order from low to high measure measured signal successively;
This measuring method comprises the following steps:
Step one, PC control the 1st grade of current/voltage sensor measurement measured signal, after measurement result removes last fault bit, obtain the 1st grade of measurement result Res (1), and be uploaded to host computer, the degree of accuracy of the 1st grade of measurement result Res (1) is thousand points of positions;
Step 2, host computer generate control signal, the 1st road compensating signal is produced by current/voltage reference source, 1st road compensating signal is the signal of the equal amplitude with the 1st grade of measurement result Res (1), measured signal and the 1st road compensating signal is made difference acquisition the 1st road M signal;
Step 3, PC control the 2nd grade of current/voltage sensor measurement measured signal, measurement result and the 1st road M signal poor, after removing last fault bit, obtain the 2nd grade of measurement result Res (2), and being uploaded to host computer, the degree of accuracy of the 2nd grade of measurement result Res (2) is thousand points of positions;
Step 4, host computer generate control signal, the 2nd road compensating signal is produced by current/voltage reference source, 2nd road compensating signal is that the 1st grade of measurement result Res (1) is added with the 2nd grade of measurement result Res (2) and signal, measured signal and the 2nd road compensating signal is made difference acquisition the 2nd road M signal;
Complete other current/voltage sensor measurement according to the process of step 3 and step 4, then perform step 5;
Step 5, by host computer, multistage measurement result to be processed, and exports final measurement Res_final:
Wherein: Res_bias is current/voltage reference source output signal deviation.
Advantage of the present invention: the high precision and large measuring range current-voltage measurement method precision based on classification measurement strategies of the present invention is high, range large, adopts the strategy that classification is measured, and while measurement range is large, ensure that high measuring accuracy.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of high precision and large measuring range current/voltage classification measuring method of the present invention.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1, the classification measuring method of the high precision and large measuring range current/voltage described in present embodiment, the method utilizes n different range, the current/voltage sensor of different accuracy is measured same measured signal; And n current/voltage sensor is undertaken sorting by measuring accuracy order from low to high measure measured signal successively;
This measuring method comprises the following steps:
Step one, PC control the 1st grade of current/voltage sensor measurement measured signal, after measurement result removes last fault bit, obtain the 1st grade of measurement result Res (1), and be uploaded to host computer, the degree of accuracy of the 1st grade of measurement result Res (1) is thousand points of positions;
Step 2, host computer generate control signal, the 1st road compensating signal is produced by current/voltage reference source, 1st road compensating signal is the signal of the equal amplitude with the 1st grade of measurement result Res (1), measured signal and the 1st road compensating signal is made difference acquisition the 1st road M signal;
Step 3, PC control the 2nd grade of current/voltage sensor measurement measured signal, measurement result and the 1st road M signal poor, after removing last fault bit, obtain the 2nd grade of measurement result Res (2), and being uploaded to host computer, the degree of accuracy of the 2nd grade of measurement result Res (2) is thousand points of positions;
Step 4, host computer generate control signal, the 2nd road compensating signal is produced by current/voltage reference source, 2nd road compensating signal is that the 1st grade of measurement result Res (1) is added with the 2nd grade of measurement result Res (2) and signal, measured signal and the 2nd road compensating signal is made difference acquisition the 2nd road M signal;
Complete other current/voltage sensor measurement according to the process of step 3 and step 4, then perform step 5;
Step 5, by host computer, multistage measurement result to be processed, and exports final measurement Res_final:
Wherein: Res_bias is current/voltage reference source output signal deviation.
Current measurement precision is followed successively by MA, kA, A, mA, μ A, pA from low to high; Voltage measurement accuracy is followed successively by MV, kV, V, mV, μ V, pV from low to high.
The scheme of present embodiment comprises measurement component at different levels, high-precision current voltage-reference, host computer three parts.
Described measurement component at different levels is made up of the current/voltage sensor of some different ranges, different accuracy, and residing for the sensor that range is larger, precision is lower, measuring sequence is more forward.Implement classification measurement strategies by carrying out coordinating with reference source part, peripheral circuit part and epigynous computer section again, thus realize the high-acruracy survey of big current, large voltage signal.
Current/voltage reference source is one or several high-precision curtage source, need survey the compensation that signal carries out each measure portion as the reference source in classification measurement strategies to reality.
Host computer receives the measurement result of measurement component at different levels and splices each several part result and integrate thus provide finally complete measurement result; And in each measuring phases, control current/voltage reference source carry out corresponding compensation to signal need be surveyed.
Use the strategy that classification is measured, namely measure the primary sensor that elder generation is large by range, precision is low and get the exact part in result, by current/voltage reference source, the fixed exact part in measured signal is compensated afterwards, and the measurement of next stage is carried out until the sensor measurement that range is minimum, precision is the highest terminates to residual signal, carry out data fusion again, thus realize the high-acruracy survey of the big current to light current field, large voltage signal.
As shown in Figure 1, first maximum by measurement range, that resolution is minimum measurement component 1 is measured to measured signal, chooses wherein accurate partly as Part I---the measurement result 1 of measurement result, and returns to host computer; Host computer generates control signal, is produced and the signal of the equal amplitude of measurement result 1, and does with measured signal the range differing from and reduce to measure needed for next stage, measured signal is become M signal 1 by high-precision current voltage-reference.The measurement component 2 that, precision less by range is higher again carries out next stage measurement, thus provide whole result center section measurement result 2 and continue through reference source compensate to measured signal generate M signal 2.One-level level like this is measured until the measurement component n that range is minimum, measuring accuracy is the highest measures end, each several part measurement result is carried out data splicing, integration by host computer, can final measurement be obtained, complete the detection for high precision and large measuring range electric current, voltage signal.
Embodiment two: present embodiment provides a specific embodiment.In present embodiment, measurement component is current sensor, and measured signal is current signal.
Assuming that measured signal is 1.0012345678928 ... A, surveying instrument is respectively the 1st grade of current sensor, the 2nd grade of current sensor, 3rd level current sensor, the 4th grade of current sensor, its range and resolution are respectively ± 10A, 1mA, ± 10mA, 1 μ A, ± 10 μ A, 1nA, with ± 10nA, 0.1pA, be sort by precision order from small to large.Current reference source resolution is 10nA.
First, measured signal is measured by the 1st grade of current sensor, measurement result is 1.001A, ignore the lowest order containing error, then the 1st grade of current sensor survey result exact part---Res (1) is 1.00A, then the electric current (the 1st road compensating signal) of PC control current reference source generation-1.00A is applied on measured signal, thus generation the 1st road M signal is: 1.234567892mA (i.e. 0.001234567892A).Measured to measured signal by the 2nd grade of current sensor again, measurement result is 1.235mA, ignore the lowest order containing error, then the 2nd grade of current sensor survey result exact part---Res (2) is 1.23mA, then PC control current reference source generates electric current (i.e. the 2nd road compensating signal of-1.00123A, that 1st grade of measurement result Res (1) is added with the 2nd grade of measurement result Res (2) and signal) be applied on measured signal, thus generate the 2nd road M signal and be: 4.567892 μ A.Measured to measured signal by 3rd level current sensor again, measurement result is 4.569 μ A, ignore the lowest order containing error, then 3rd level current sensor survey result exact part---Res (3) is 4.56 μ A, now host computer should control current reference source and generates the electric current (the 3rd road compensating signal: Res (1)+Res (2)+Res (3)) of-1.00123456A and be applied on measured signal, thus generates the 3rd road M signal and be: 7.892nA.But because current reference source precision is 10nA, therefore there is error at lowest order during the electric current of current reference source generation-1.00123456A, therefore also need the output valve of method to current reference source measured by classification to measure, thus obtaining the accurate output valve of current reference source, precision need reach 10nA.Suppose that the actual current that current reference source generates is-1.00123454A, then the reality generated the 3rd road M signal is 7.892nA, and recording current reference source output signal deviation Res_bias is-0.00000002A.
Finally, measured by the 4th grade of current sensor, measurement result is 7.8926nA, ignores the lowest order containing error, then the 4th grade of current sensor survey result exact part---Res (4) is 7.892nA.4 measurement results (Res_1 ~ Res_4) being carried out stack combinations finally by host computer, to obtain measurement result be 1.001234587892A.Current reference source output signal deviation again by recording compensates measurement result 1.001234587892A, namely obtains the measurement result that final precision is pA---1.001234567892A.The process formula of host computer to data can be summarized as:
Wherein Res_final is final measurement, and Res (i) is the exact part of the measurement result of the i-th part measurement component, and Res_bias is current reference source output signal deviation.
Above the classification measuring method of high precision and large measuring range current/voltage provided by the invention is described in detail, the measurement component used is not limited in existing all kinds of electric current, voltage-measuring equipment, also comprises the electric current, the voltage measurement method that are realized by equivalent manners.For those skilled in the art, without departing from the premise in the spirit of the present invention to any apparent change that he does, all by formation to infringement of the present invention, corresponding legal liabilities will be born.
Claims (2)
1. the classification measuring method of high precision and large measuring range current/voltage, is characterized in that, the method utilizes n different range, the current/voltage sensor of different accuracy is measured same measured signal; And n current/voltage sensor is undertaken sorting by measuring accuracy order from low to high measure measured signal successively;
This measuring method comprises the following steps:
Step one, PC control the 1st grade of current/voltage sensor measurement measured signal, after measurement result removes last fault bit, obtain the 1st grade of measurement result Res (1), and be uploaded to host computer, the degree of accuracy of the 1st grade of measurement result Res (1) is thousand points of positions;
Step 2, host computer generate control signal, the 1st road compensating signal is produced by current/voltage reference source, 1st road compensating signal is the signal of the equal amplitude with the 1st grade of measurement result Res (1), measured signal and the 1st road compensating signal is made difference acquisition the 1st road M signal;
Step 3, PC control the 2nd grade of current/voltage sensor measurement measured signal, measurement result and the 1st road M signal poor, after removing last fault bit, obtain the 2nd grade of measurement result Res (2), and being uploaded to host computer, the degree of accuracy of the 2nd grade of measurement result Res (2) is thousand points of positions;
Step 4, host computer generate control signal, the 2nd road compensating signal is produced by current/voltage reference source, 2nd road compensating signal is that the 1st grade of measurement result Res (1) is added with the 2nd grade of measurement result Res (2) and signal, measured signal and the 2nd road compensating signal is made difference acquisition the 2nd road M signal;
Complete other current/voltage sensor measurement according to the process of step 3 and step 4, then perform step 5;
Step 5, by host computer, multistage measurement result to be processed, and exports final measurement Res_final:
Wherein: Res_bias is current/voltage reference source output signal deviation.
2. the classification measuring method of high precision and large measuring range current/voltage according to claim 1, is characterized in that, current measurement precision is followed successively by MA, kA, A, mA, μ A, pA from low to high; Voltage measurement accuracy is followed successively by MV, kV, V, mV, μ V, pV from low to high.
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