Method for testing radiated noises of digital gravity metering device

A measurement equipment and radiated noise technology, applied in the direction of noise coefficient or signal-to-noise ratio measurement, measuring electricity, measuring devices, etc., can solve the problem of high cost, achieve the effect of effective suppression, suppression of radiated noise, and saving of measurement costs

Active Publication Date: 2010-11-17
苏州泰思特电子科技有限公司
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Problems solved by technology

However, the cost of measuring electromagnetic radiation in an existing microwave anechoic chamber is relatively high, so how to develop a kind of radiation noise test m

Method used

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  • Method for testing radiated noises of digital gravity metering device
  • Method for testing radiated noises of digital gravity metering device
  • Method for testing radiated noises of digital gravity metering device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0041] Embodiment: a kind of radiation noise test method for digital gravimetric measuring equipment, comprises the following steps:

[0042] Step 1: Test the performance of common-mode insertion loss and differential-mode rejection ratio of the conducted noise separation network in the radiated noise frequency band to confirm that the conducted noise separation network meets the measurement requirements in the radiated noise frequency band;

[0043] Step 2: Calculate the corresponding transfer impedance Z(ω) according to the high-frequency current clamp structure, and the specific calculation formula of the transfer impedance Z(ω) is:

[0044] Z ( ω ) = R 2 R 2 + jω L 2 · jωM

[0045] In the formula, R 2 for, L 2 is, ...

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Abstract

The invention discloses a method for testing radiated noises of a digital gravity metering device, which comprises the following steps of: calculating corresponding transfer impedance according to a high-frequency current clamp structure; putting a measuring loop in the high-frequency current clamp on a power cord of the digital gravity metering device so as to extract a first noise voltage and a second noise voltage in the power cord; performing a vector operation and a vector difference operation on the first noise voltage and the second noise voltage by using a noise separation network so as to obtain a difference mode conducted noise voltage and a common mode conducted noise voltage; performing operation on the difference mode conducted noise voltage, the common mode conducted noise voltage and the transfer impedance of the high-frequency current clamp to obtain a difference mode conducted noise current and a common mode conducted noise current; and acquiring an electric field which emits the radiation noises in a free space according to a common mode noise current formula. In the method, the common mode noise current of a single-chip digital gravity metering device is measured by using the high-frequency current clamp and the noise separation network, and the radiated noises are predicted through the common mode noise current.

Description

technical field [0001] The invention relates to a radiation noise testing method for digital gravity measuring equipment, which belongs to the field of electromagnetic compatibility testing and power line communication. Background technique [0002] Electronic equipment products must pass corresponding standard tests before they are marketed, one of which is the standard test for radiated electromagnetic interference. The radiated noise of digital gravimetric measuring equipment based on single-chip microcomputer is mainly caused by the radiation of its transmission cable. However, the cost of measuring electromagnetic radiation in an existing microwave anechoic chamber is relatively high, so how to develop a simple method for the radiation noise testing method of digital gravity measuring equipment for the characteristics of single-chip digital gravity measuring equipment is the problem of the present invention. . Contents of the invention [0003] The purpose of the pr...

Claims

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Application Information

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IPC IPC(8): G01R31/00G01R29/26
Inventor 赵阳黄学军董颖华颜伟
Owner 苏州泰思特电子科技有限公司
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