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Assistant measurement device for measuring insertion loss of power filter of shielding facility

A power filter and auxiliary measurement technology, which is applied in the direction of measuring devices, measuring electrical variables, measuring resistance/reactance/impedance, etc., can solve the problems of destroying filter insertion loss, destroying filter electromagnetic isolation, etc.

Active Publication Date: 2019-10-25
上海埃德电子股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this operation is not allowed on the filter product, because setting the RF connector destroys the electromagnetic isolation between the input and output of the filter, and also destroys the insertion loss of the filter

Method used

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  • Assistant measurement device for measuring insertion loss of power filter of shielding facility
  • Assistant measurement device for measuring insertion loss of power filter of shielding facility
  • Assistant measurement device for measuring insertion loss of power filter of shielding facility

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Such as Figure 7A and Figure 7BAs shown, it is an auxiliary device for measuring the insertion loss of the power filter of the shielding facility according to the standard GB / T7343 in this embodiment. It selects a 50-ohm SMA RF connector, specially for image 3 Designed for small square holes at both ends of the medium filter. When measuring the insertion loss of the shielded facility power filter according to the standard GB / T7343, it is required Figure 7A and Figure 7B Auxiliary devices can be used with Figure 4 The 8 screw terminals in can realize electric connection. if Figure 7A and Figure 7B The auxiliary device in is a female SMA connector 201, which also needs to be connected with a cable (not shown in the figure) equipped with an SMA male head, so as to realize the electrical connection between the screw terminal of the filter under test and the measuring instrument. When designing, the size of the SMA male cable and the size of the cable's allowa...

Embodiment 2

[0046] For high current shielded facility power filters, Figure 5 The screw terminals in may be M8, M10 or M12. The connected cables are thick and hard, and the installation of the cables is difficult. so image 3 The size of the two square holes at both ends of the filter, which are specially designed for the installation of cables, needs to be enlarged. Figure 12A and Figure 12B Another auxiliary device for measuring the insertion loss of the power filter of the shielding facility according to the standard GB / T7343.

[0047] Figure 12A and Figure 12B 201' is a 50 ohm N-type RF connector. Due to the limited area of ​​the copper plate 203, the fixed position of the insulator 207 is changed, and it is fixed by the screw 212 on the side of the copper cylinder 205.

[0048] Figure 12A and Figure 12B The hexagonal copper nut cylinder 208 and the insulator 207 are designed according to the external dimensions of M12. Under the principle of not changing the external d...

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Abstract

The invention relates to an assistant measurement device for measuring insertion loss of a power filter of a shielding facility. The assistant measurement device is characterized by comprising a firsthollow copper column body, a lower end of the first copper column body is opening and an upper end is closed by a copper plate; when the assistant measurement device is mounted in place, good electrical connection is formed between the lower end of the first copper column body and a metal shield of the filter; a RF connector is arranged on a copper plate; a cooper nut column is arranged in the first copper column body, the copper nut column is connected with an inner conductor of the RF connector, a bolt terminal of an input end or an output end of the filter stretches into the first copper column body and is occluded with the copper nut column, and thus, the RF connector is connected to the input end or the output end of the filter; and an insulator is arranged between the copper nut column and an inner wall of the copper column body. The assistant measurement device provided by the invention not only can measure insertion loss according to regulations of the standard GB / T7343, but also can effectively control electromagnetic coupling which may exist between input and output of the filter.

Description

technical field [0001] The invention relates to a measurement method for measuring the insertion loss of a shielding facility power supply filter according to the standard GB / T7343, and belongs to the technical field of measurement of suppression characteristics of passive EMC filters. Background technique [0002] The measurement of the insertion loss of the power filter of the shielding facility belongs to the category of the standard "GB / T 7343-2017 / IEC / CISPR17:2011 Measurement method for the suppression characteristics of passive EMC filter devices" (hereinafter referred to as GB / T 7343). [0003] According to the standard GB / T 7343, when testing the suppression characteristics of passive EMC filters, the filter under test should be placed in the test box described in Section 5.2.2.4 of the standard. Due to the bulky size of the power filter of the shielding facility, the mass is in the range of tens or even hundreds of kilograms. First of all, it is expensive to manufa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/26
CPCG01R27/2694
Inventor 柳光福
Owner 上海埃德电子股份有限公司