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An Auxiliary Measuring Device for Measuring the Insertion Loss of Power Filter of Shielding Facilities

A power supply filter, auxiliary measurement technology, applied in the direction of measurement device, measurement of electrical variables, measurement of resistance/reactance/impedance, etc., can solve the problems of destroying the insertion loss of the filter, destroying the electromagnetic isolation of the filter, etc. control effect

Active Publication Date: 2021-06-11
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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  • An Auxiliary Measuring Device for Measuring the Insertion Loss of Power Filter of Shielding Facilities
  • An Auxiliary Measuring Device for Measuring the Insertion Loss of Power Filter of Shielding Facilities
  • An Auxiliary Measuring Device for Measuring the Insertion Loss of Power Filter of Shielding Facilities

Examples

Experimental program
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Embodiment 1

[0033] like 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 allowable...

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 auxiliary measuring device for measuring the insertion loss of a power supply filter of a shielding facility, which is characterized in that it comprises a hollow copper cylinder, the lower end of which is open, and the upper end is closed by a copper plate, and the auxiliary measuring device is installed in place Finally, there is a good electrical connection between the lower end of the copper cylinder one and the metal shield of the filter; the RF connector is provided on the copper plate; the copper nut cylinder is provided inside the copper cylinder one, and the copper nut cylinder is connected to the RF connector through the wire. The inner conductor of the connector is connected, and the screw terminal of the input or output end of the filter extends into the copper cylinder and bites together with the copper nut cylinder, so that the RF connector is connected to the input or output of the filter; copper An insulator is provided between the nut cylinder and the inner wall of the copper cylinder one. The invention can not only measure the insertion loss according to the standard GB / T7343, but also effectively control the electromagnetic coupling that may exist between the 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 Patents(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