A high stability current source assessment method and system
A current source, output current technology, applied in the field of measurement and testing, can solve the problems of time change drift, use deviation, real output deviation from ideal values, etc., to achieve the effect of improving measurement uncertainty
Active Publication Date: 2020-04-21
BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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Problems solved by technology
With the influence of the environment and the aging of internal devices, the actual output of the current source will deviate from the ideal value and drift with time, causing obvious deviations in use
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[0025] In order to make the objectives, technical solutions, and advantages of the present application clearer, the technical solutions of the present application will be described clearly and completely in conjunction with specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of this application.
[0026] In order to understand the present invention, first distinguish the meaning of calibration and assessment. Calibration is generally to measure once (it can be multiple numbers) and give data. The assessment is to measure for a period of time (multiple times) or once at intervals, and to determine the long-term stability of the instrument under test by me...
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The invention discloses a highly-stable current source examination method and system. The method comprises the following steps that a highly-stable current source outputs a current, and the current passes through a direct current diverter to be converted into a direct current voltage; a programmable voltage reference outputs an ideal voltage; the difference value between the ideal voltage and the direct current voltage is measured and a direct current voltage calibration value is obtained; and data that calibration values changes with time are obtained by repeating the abovementioned steps. The system comprises a programmable voltage reference, a direct current diverter, a direct current voltmeter, a low thermal electric potential program control switch and a control computer. The programmable voltage reference outputs the ideal voltage. The direct current diverter is connected with the highly-stable current source to generate a direct current voltage. The direct current voltmeter measures the difference value between the ideal voltage and the direct current voltage. The low thermal electric potential program control switch is connected with the programmable voltage reference, the direct current diverter, and the direct current voltmeter. The control computer controls the programmable voltage reference and the low thermal electric potential program control switch, reads the reading of the dirct current voltmeter, and calculates the direct current voltage calibration value. The invention improves the measurement uncertainty of the highly-stable current source by an order of magnitude.
Description
Technical field [0001] This application relates to the field of measurement and testing, and in particular to a current source assessment method. Background technique [0002] To calibrate the output current of an electrical device, the most commonly used method is the direct measurement method, which is to use a digital ammeter to directly measure the output current for calibration. At present, the accuracy of DC current measurement of high-precision digital ammeters is ±0.01%~±0.005%. The indirect measurement method is to convert the output DC current into a DC voltage, and then accurately measure the DC voltage. The currently used high-stability current source The highest accuracy of the precision shunt is only ±0.001%. When the output current is calibrated by directly measuring the difference between two current sources, the output stability of the current source used for calibration will affect the accuracy of the calibration, and the current source will also be affected by...
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IPC IPC(8): G01R31/40G01R1/28
CPCG01R1/28G01R31/40
Inventor 朱珠康焱岳伟
Owner BEIJING INST OF RADIO METROLOGY & MEASUREMENT