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Method and device for automatically converting measuring range in alternating current measurement

An automatic range and conversion method technology, applied in the field of automatic range conversion methods and devices in AC testing, can solve problems such as accidents, inaccurate results, and inability to quickly respond to changes in the peak value of the measured AC signal, and achieve automatic range and automatic conversion. Effect

Inactive Publication Date: 2012-05-30
SHENZHEN CLOU ELECTRONICS
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  • Abstract
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for quickly identifying the magnitude of the AC signal that can quickly, Method and device for automatically converting range

Method used

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  • Method and device for automatically converting measuring range in alternating current measurement
  • Method and device for automatically converting measuring range in alternating current measurement
  • Method and device for automatically converting measuring range in alternating current measurement

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Embodiment Construction

[0025] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0026] Such as figure 1 As shown, in the automatic range conversion method and device embodiment in the AC test of the present invention, the range conversion method includes the following steps:

[0027] S11 Obtaining the current sampling value: In this step, as the beginning of the automatic range conversion method in the AC test, the sampling value of the AC signal is obtained, and the sampling value is obtained by directly sampling the AC signal under test. Amplitude is the amplitude of the AC signal at the time of sampling. In this embodiment, the sampling of the AC signal will not be interrupted once the test is started, and the sampling speed is also set in advance, for example, sampling 1024 times in one cycle of the AC signal. In this step, it is possible to sample at any position in one cycle of the AC signal, and the difference in the sampli...

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Abstract

The invention relates to a method for automatically converting a measuring range in alternating current measurement. The alternating current measurement comprises the following steps: sampling a measured alternating current signal at certain sampling velocity, and carrying out analog-to-digital conversion on the sampled signal; representing different amplitudes of sampling values obtained in different measuring ranges by adopting binary digits with the same digit during the analog-to-digital conversion; directly comparing the binary digit representing the sampling amplitude of the sampling value with a first set value; and selecting the measuring range according to the comparison result. The invention also discloses an automatic measuring range conversion device. Implementation of the method and the device for automatically converting the measuring range in the alternating current measurement has the advantages of quickly and automatically converting the measuring range.

Description

technical field [0001] The invention relates to the field of alternating current parameter testing, in particular to a method and device for automatic range conversion in alternating current testing. Background technique [0002] Since the AC signal is a signal whose size and direction change with time period, for example, a sine wave, when it is sampled, the value of each sampling point is different, there are peaks and troughs. Generally, the effective value of its periodic signal is used as the amplitude of the signal to reflect the size of the signal. The traditional method is: convert the AC signal into a DC signal through the transmitter, and then send the DC signal to the AD for sampling to calculate the effective value, or directly conduct AC sampling to calculate the effective value of the signal. However, when testing an AC signal, the effective value of the signal can only be obtained after several cycles in the above method. That is, the rms value cannot quickl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/25G01R15/09
Inventor 曾春山
Owner SHENZHEN CLOU ELECTRONICS
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