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Sampling method based on software frequency tracking and broadband voltage/power calibration device

A frequency tracking and broadband technology, applied in measurement devices, measurement of electrical variables, measurement using digital measurement technology, etc., can solve the problems of low measurement accuracy, complex uncertainty analysis, and slow measurement speed.

Active Publication Date: 2014-12-24
BEIJING DONGFANG MEASUREMENT & TEST INST
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Problems solved by technology

[0008] The present invention also provides a wide-band voltage or current calibration device based on the sampling method of software frequency tracking, which solves the problem of low measurement accuracy of wide-band AC voltage (current) with a frequency range of 10 Hz to 1 MHz for many years, and adopts the AC-DC conversion method The measurement method has slow measurement speed and complex uncertainty analysis, providing an accurate and convenient calibration device for broadband AC voltage (current) measurement

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  • Sampling method based on software frequency tracking and broadband voltage/power calibration device
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  • Sampling method based on software frequency tracking and broadband voltage/power calibration device

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Embodiment Construction

[0034] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0035] Such as figure 1 Shown, a kind of sampling method based on software frequency tracking, described sampling is non-period sampling, comprises the following steps;

[0036] 1) According to the setting value of the measured periodic signal frequency, the initial sampling frequency f of the theoretical full-cycle sampling is calculated according to the pre-designed sampling point number n times of a cycle s ; For example, for a measured periodic signal with a known frequency of 50Hz, if the number of sampling points n in one cycle is selected as 512, then the initial sampling frequency f s =50*512=25.6kHz.

[0037] 2) Use the signal generator to output the sampling trigger signal to the sampling digital voltmeter, and set the output frequency of the signal generator according to the calculated initial sampling frequency;

[0038] 3) Start...

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Abstract

The invention provides a sampling method based on software frequency tracking. Non-full-period sampling is adopted, the deviation of the non-full-period sampling is decreased to be lower than a specified value, standard full-period sampling is achieved, and measurement accuracy of the non-full-period sampling is improved. The invention provides a broadband voltage / current calibration device and a broadband power / phase calibration device adopting the sampling method based on software frequency tracking. The broadband voltage / current calibration device comprises a broadband voltage / current source, a broadband resistance voltage / current divider, a sampling digital voltmeter, a signal generator and a computer, wherein the broadband voltage / current source is connected with the sampling digital voltmeter through the broadband resistance voltage / current divider, the output end of the signal generator is connected with an outer trigger port of the sampling digital voltmeter, and the computer is respectively connected with the signal generator, the sampling digital voltmeter and the broadband voltage / current source.

Description

technical field [0001] The invention relates to the technical field of AC electric quantity measurement, in particular to a sampling method based on software frequency tracking and a broadband voltage / power calibration device. Background technique [0002] With the application of computer technology in the field of AC power measurement technology and the improvement of the performance of high-speed A / D converters, most AC voltage (current) measurement methods use sampling digital measurement methods, which are roughly divided into DC sampling and AC sampling. [0003] DC sampling method, that is, the sampling is the rectified DC flow. When using the DC sampling method to measure voltage and current, the effective value of the electrical parameter is measured by measuring the average value. The software design of this method is simple, the computer is convenient, and the measured value can be obtained only by performing a proportional transformation on the sampled value. Ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/25G01R35/04G01R22/10
Inventor 胡志远金海彬游立彭诚
Owner BEIJING DONGFANG MEASUREMENT & TEST INST
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