CN118980862A - A resistance precision measurement system and method based on synchronous sampling - Google Patents
A resistance precision measurement system and method based on synchronous sampling Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/14—Measuring resistance by measuring current or voltage obtained from a reference source
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Abstract
The invention relates to the technical field of metering test instruments, and particularly discloses a resistance precision measurement system and method based on synchronous sampling, wherein the system comprises the following steps: the high-precision current source, the measured resistor and the comparison resistor are mutually connected into a serial loop; the two high-precision voltage measuring instruments are respectively connected in parallel with the two ends of the measured resistor and the comparison resistor and are used for measuring the voltages of the two resistors in real time with high precision; and the synchronous trigger signal source is connected with the trigger ends of the two high-precision voltage measuring instruments at the same time, and is used for synchronously triggering the voltage sampling of the two high-precision voltage measuring instruments. The high-precision current source outputs forward current and reverse current periodically, can be used for eliminating the influence caused by current bias and thermoelectric potential in a system, effectively removes measurement interference between two resistors caused by factors such as resistance drift and current fluctuation in a synchronous sampling mode, and can realize high-precision measurement of the resistors under different current ranges.
Description
Technical Field
The invention relates to the technical field of metering test instruments, in particular to a resistance precise measurement system and method based on synchronous sampling.
Background
Along with the development of science and technology and the improvement of instrument precision, the requirements for precisely measuring the electrical quantity are higher and higher. After the international system of units (SI) quantization has been changed in 2019, the basic units are redefined and all defined on basic physical constants. Resistance is one of the most common electrical components, and high-accuracy resistance plays a vital role in the fields of precision measurement and the like. The reproduction of the resistance unit is based on quantized Hall effect, and only depends on two error-free basic physical constants of the Planck constant h and the basic charge e, and does not change with time and space. Currently, research on a precision measurement method of resistance is becoming an important research direction in the field of precision electromagnetic metering.
At present, the national standard of the direct current resistor of each country in the world is established based on the quantum Hall effect, and the quantum Hall resistor is mainly prepared by adopting gallium arsenide-aluminum gallium arsenide heterogeneous materials to realize the reproduction of a resistor unit. However, as the quantum Hall effect is discovered by the graphene materials, the preparation of the quantum Hall resistor device based on graphene has great advantages and prospects in reproducing the resistance value, however, due to the complexity of the preparation process, the sizes of many graphene materials are smaller, the flowing current is limited, and in the test transmission process, very small current within 10uA can be always introduced. The extremely small current flow presents challenges to the test system and conventional laboratory resistor transfer devices such as direct current resistor bridges (DCC) are not suitable for resistance measurements under low current conditions due to the high current surges generated during pre-balancing and commutation. Therefore, how to build in a laboratory environment is convenient, the transplanting operation is simple, and meanwhile, the precise measurement of the resistance under different current flowing ranges can be met, so that the problem to be solved is urgent.
Based on the technical background, the invention researches a resistor precision measurement system and method based on synchronous sampling.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a resistor precision measurement system and a resistor precision measurement method based on synchronous sampling, which adopt a single current source to input and are connected in series with a standard resistor to be compared and a measured resistor, adopt a high-precision digital voltmeter to measure voltages at two ends of the compared resistor and the measured resistor, simultaneously design a synchronous trigger signal to the digital voltmeter to realize synchronous measurement, and can convert the voltage ratio between the two resistors to finish the measurement of the measured resistor.
To achieve the above object, a first aspect of the present invention provides a precision resistance measurement system based on synchronous sampling, including:
the high-precision current source, the measured resistor and the comparison resistor are mutually connected into a serial loop;
the two high-precision voltage measuring instruments are respectively connected in parallel with the two ends of the measured resistor and the comparison resistor and are used for measuring the voltages of the two resistors in real time and high precision;
and the synchronous trigger signal source is connected with the trigger ends of the two high-precision voltage measuring instruments at the same time, and is used for synchronously triggering the voltage sampling of the two high-precision voltage measuring instruments.
A second aspect of the present invention provides a precision resistance measurement method based on synchronous sampling in the above system, including:
the high-precision current source, the measured resistor and the comparison resistor are mutually connected into a serial loop;
Synchronously triggering two high-precision voltage measuring instruments by using a synchronous trigger signal output by a synchronous trigger signal source;
and the voltages of the measured resistor and the comparison resistor are measured in real time with high precision by using two high-precision voltage measuring instruments.
The beneficial effects of the invention include:
(1) The resistor precision measurement system based on synchronous sampling provided by the invention adopts a single current source to input and is connected in series with the standard resistor to be compared and the measured resistor, adopts a high-precision digital voltmeter to measure the voltages at two ends of the compared resistor and the measured resistor, designs a synchronous trigger signal to the digital voltmeter to realize synchronous measurement, and can convert the voltage ratio between the two resistors to finish the measurement of the measured resistor.
(2) The resistor precision measurement system based on synchronous sampling provided by the invention has the advantages that the high-precision current source periodically outputs forward current and reverse current, the influence caused by current bias and thermoelectric potential in the system can be eliminated, the measurement interference caused by factors such as resistance drift and current fluctuation between two resistors is effectively removed in a synchronous sampling mode, and the resistor high-precision measurement under different current ranges can be realized.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings.
Fig. 1 is a schematic structural diagram of a synchronous sampling-based resistor precision measurement system according to the present invention.
Description of the reference numerals
1-High-precision current source, 2-measured resistor, 3-comparison resistor, 4-synchronous trigger signal source and 5-two high-precision voltage measuring instruments.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the preferred embodiments of the present invention are described below, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein.
The invention provides a resistance precision measurement system based on synchronous sampling, as shown in figure 1, comprising:
the high-precision current source 1, the measured resistor 2 and the comparison resistor 3 are mutually connected into a series circuit;
The two high-precision voltage measuring instruments 5 are respectively connected in parallel with the two ends of the measured resistor 2 and the comparison resistor 3 and are used for measuring the voltages of the two resistors in real time and high precision;
And the synchronous trigger signal source 4 is connected with the trigger ends of the two high-precision voltage measuring instruments 5 at the same time, and is used for synchronously triggering the voltage sampling of the two high-precision voltage measuring instruments 5.
According to the invention, a single current source is adopted for input and is connected with a standard resistor to be compared and a measured resistor in series, a high-precision digital voltmeter is adopted for measuring voltages at two ends of the comparison resistor and the measured resistor, and a synchronous trigger signal is designed to the digital voltmeter to realize synchronous measurement.
According to the invention, the high-precision current source 1 periodically outputs forward current and reverse current, which are used for eliminating the influence caused by current bias and thermoelectric potential in a system.
According to the invention, the output range of the high-precision current source 1 is 1 uA-1A magnitude, and the current accuracy is better than 1 nA.
Preferably, the frequency of the synchronous trigger signal output by the synchronous trigger signal source 4 is 10 uHz-10 kHz.
According to the invention, the two high-precision voltage measuring instruments 5 measure positive pressure or negative pressure simultaneously, the measuring ranges are 1 uV-10V, and the input impedance is larger than 1GΩ.
According to the invention, when the high-precision current source 1 is in the forward and reverse current commutation process, the sampling voltages of the two high-precision voltage measuring instruments 5 are invalid.
Preferably, the voltage sampling of the two high-precision voltage measuring instruments 5 is triggered synchronously to ensure that the voltages obtained by sampling the measured resistor 2 and the comparison resistor 3 are synchronous, so that the influence between the two resistors caused by resistance drift and current fluctuation is removed.
The high-precision current source outputs forward current and reverse current periodically, can be used for eliminating the influence caused by current bias and thermoelectric potential in a system, effectively removes measurement interference between two resistors caused by factors such as resistance drift and current fluctuation in a synchronous sampling mode, and can realize high-precision measurement of the resistors under different current ranges.
According to the present invention, the method for obtaining the resistance value of the measured resistor 2 includes:
The ratio between the voltages obtained by sampling the measured resistor 2 and the comparison resistor 3 is obtained;
And obtaining the resistance value of the measured resistor 2 by conversion according to the resistance value based on the ratio between the voltages.
The invention also provides a resistance precision measurement method based on synchronous sampling in the system, which comprises the following steps:
The high-precision current source 1, the measured resistor 2 and the comparison resistor 3 are mutually connected into a series circuit;
synchronously triggering two high-precision voltage measuring instruments 5 by using a synchronous trigger signal output by the synchronous trigger signal source 4;
the voltages of the measured resistor 2 and the comparison resistor 3 are measured in real time with high precision by using two high precision voltage measuring instruments 5.
According to the present invention, there is also provided:
The ratio between the voltages obtained by sampling the measured resistor 2 and the comparison resistor 3 is obtained;
And obtaining the resistance value of the measured resistor 2 by conversion according to the resistance value based on the ratio between the voltages.
The present invention will be described in more detail with reference to examples.
Examples
As shown in fig. 1, the embodiment provides a resistor precision measurement system based on synchronous sampling, which comprises a high-precision current source 1, a measured resistor 2, a comparison resistor 3, a synchronous trigger signal 4 and a high-precision voltage measurement instrument 5;
The high-precision current source 1 in the embodiment is a Keithley current source, has good accuracy, stability and reliability, can provide 1nA to 100 mA current, and has current accuracy superior to 1nA;
The high-precision voltage measuring instrument 5 is a multi-bit digital multimeter 8508A of Fluke company, and the optimal 8-bit half resolution is achieved;
The synchronous trigger signal source 4 is a signal generator of Keysight company, which can be used for square waves of 10 uHz-10 kHz;
in this embodiment, the system connection mode:
The 6221 type current source output is connected in series with the comparison resistor and the tested resistor; two 8508A digital multimeters are respectively connected in parallel at two ends of a resistor to be measured and a standard resistor, sampling voltages at two ends of the resistor are subtracted by selecting an F-R mode on 8508A, so that differential pressure data corresponding to the resistor can be obtained, and meanwhile, in order to ensure voltage measurement accuracy, an 8.5-bit resolution gear under a direct current mode is selected; the synchronous trigger signal source 33522A is connected to the trigger ends of the two 8508A, and the synchronous trigger signal source 33522A can ensure that the two instruments can synchronously sample by generating a fixed frequency square wave;
the measurement experiment procedure at small current (I1 uA) is as follows:
6221 current source 1 introduces current I to the resistor to be tested and the standard resistor, in this embodiment, the current is 1uA, and the reversing of the forward and reverse currents is completed every 2 min;
Two 8508A digital multimeters measure the voltage of the resistance to be measured and the voltage of the two ends of the standard resistance, input terminals on the front panel and the rear panel are connected to the two ends of the resistance, an F-R mode is selected on a 8508A control panel, and an 8.5-bit resolution gear under a direct current mode is selected;
The 33522A signal generator outputs square wave signals with the frequency of 0.1 Hz and the peak-to-peak value of 5V to two pieces of equipment simultaneously;
the upper computer is adopted to read the voltage sampling values of the two 8508A in real time, and then data processing is carried out;
Removing the voltage of the comparison resistor and the measured resistor measured in each current reversing process, and dividing the voltage of the comparison resistor measured synchronously by the voltage of the measured resistor;
the experimental procedure for measurement at high current I (100 uA) is as follows:
6221 current source 1 introduces current I into the resistor to be tested and the standard resistor, in this embodiment, the current is selected to be 100uA, and the reversing of the forward current and the reverse current is completed every 2 min;
Two 8508A digital multimeters measure the voltage of the resistance to be measured and the voltage of the two ends of the standard resistance, input terminals on the front panel and the rear panel are connected to the two ends of the resistance, an F-R mode is selected on a 8508A control panel, and an 8.5-bit resolution gear under a direct current mode is selected;
The 33522A signal generator outputs square wave signals with the frequency of 0.1 Hz and the peak-to-peak value of 5V to two pieces of equipment simultaneously;
the upper computer is adopted to read the voltage sampling values of the two 8508A in real time, and then data processing is carried out;
And removing the voltage of the comparison resistor and the measured resistor measured in each current reversing process, and dividing the voltage of the comparison resistor measured synchronously by the voltage of the measured resistor.
The resistor precision measurement system based on synchronous sampling provided by the embodiment of the invention, wherein the high-precision current source periodically outputs forward current and reverse current, can be used for eliminating the influence caused by current bias and thermoelectric potential in the system, effectively removes measurement interference between two resistors caused by factors such as resistance drift, current fluctuation and the like in a synchronous sampling mode, and can realize high-precision measurement of the resistor under different current ranges.
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described.
Claims (10)
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1605876A (en) * | 2004-11-26 | 2005-04-13 | 清华大学 | Direct current resistance comparison measurement method and measuring instrument |
| CN103235189A (en) * | 2013-04-28 | 2013-08-07 | 哈尔滨理工大学 | High-precision micro resistor measurement method based on double-current voltage ratio method and measurement system for realizing method |
| CN204630676U (en) * | 2015-03-25 | 2015-09-09 | 江南大学 | A kind of platinum resistance temperature measurement mechanism of wide-range high-precision |
| CN106093577A (en) * | 2016-06-03 | 2016-11-09 | 中国计量科学研究院 | Measuring method and measuring circuit are quickly compared in a kind of impedance |
| CN110907691A (en) * | 2019-12-05 | 2020-03-24 | 中国人民解放军92942部队 | Wide-range direct-current voltage measuring device based on resistance voltage division time-sharing sampling self-calibration |
| CN117214542A (en) * | 2023-10-27 | 2023-12-12 | 重庆市计量质量检测研究院 | Direct current resistance measuring method, measuring device and automatic direct current resistance measuring system |
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- 2024-09-11 CN CN202411271131.3A patent/CN118980862A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1605876A (en) * | 2004-11-26 | 2005-04-13 | 清华大学 | Direct current resistance comparison measurement method and measuring instrument |
| CN103235189A (en) * | 2013-04-28 | 2013-08-07 | 哈尔滨理工大学 | High-precision micro resistor measurement method based on double-current voltage ratio method and measurement system for realizing method |
| CN204630676U (en) * | 2015-03-25 | 2015-09-09 | 江南大学 | A kind of platinum resistance temperature measurement mechanism of wide-range high-precision |
| CN106093577A (en) * | 2016-06-03 | 2016-11-09 | 中国计量科学研究院 | Measuring method and measuring circuit are quickly compared in a kind of impedance |
| CN110907691A (en) * | 2019-12-05 | 2020-03-24 | 中国人民解放军92942部队 | Wide-range direct-current voltage measuring device based on resistance voltage division time-sharing sampling self-calibration |
| CN117214542A (en) * | 2023-10-27 | 2023-12-12 | 重庆市计量质量检测研究院 | Direct current resistance measuring method, measuring device and automatic direct current resistance measuring system |
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