Test system for voltage distortion spectrum testing from 150kHz to 500kHz

Abstract

This utility model discloses a test system for voltage distortion spectrum testing from 150kHz to 500kHz, comprising a network switch, a low-frequency signal source, an audio power amplifier, a coupling transformer, an attenuator, a calibration resistor, and an EMI measurement receiver; the low-frequency signal source is electrically connected to the audio power amplifier; the audio power amplifier is electrically connected to the primary winding of the coupling transformer via the attenuator; the calibration resistor is electrically connected to the attenuator; the EMI measurement receiver is electrically connected to the secondary winding of the coupling transformer; the network switch is communicatively connected to both the low-frequency signal source and the EMI measurement receiver via Ethernet.

Description

Technical Field

[0001] This utility model belongs to the field of electronic equipment technology, specifically relating to a test system for voltage distortion spectrum testing from 150kHz to 500kHz. Background Technology

[0002] Among the various parameters of aircraft power supply characteristics, the ability of electronic equipment to withstand voltage distortion from within the system is a crucial parameter for evaluating product electrical performance. The existing testing standard, GJB181, specifies voltage distortion requirements of 25Hz to 500kHz, with limits ranging from 0.1V to 0.001V. However, the standard only states the requirement without providing a testing scheme. Actual supporting testing standards (such as HB20326), considering test methods and operability, do not require voltage distortion spectrum testing above 150kHz. Existing voltage distortion spectrum testing systems can only test up to 150kHz and cannot complete low-value distortion spectrum tests.

[0003] Existing voltage distortion testing systems use oscilloscopes to monitor distortion signals. However, due to the extremely low signal magnitude, these signals are often overwhelmed by noise generated in the link during practical use, making it impossible to capture the low-level distortion signals required by the standard amidst the noise. Furthermore, existing coupling transformers from domestic manufacturers cannot reach frequencies up to 500kHz. All of these factors create difficulties for testing low-level voltage distortion in the 150kHz–500kHz range. Utility Model Content

[0004] The purpose of this utility model is to provide a test system for voltage distortion spectrum testing from 150kHz to 500kHz, which changes the structure of the original test system to solve the above-mentioned problems.

[0005] To address the aforementioned problems in the existing technology, the technical solution adopted by this utility model is as follows:

[0006] A test system for voltage distortion spectrum testing from 150kHz to 500kHz includes a network switch, a low-frequency signal source, an audio power amplifier, a coupling transformer, an attenuator, a calibration resistor, and an EMI measurement receiver.

[0007] The low-frequency signal source is electrically connected to the audio power amplifier;

[0008] The audio power amplifier is electrically connected to the primary winding of the coupling transformer via an attenuator;

[0009] The calibration resistor is electrically connected to the secondary winding of the coupling transformer;

[0010] The EMI measurement receiver is electrically connected to the secondary winding of the coupling transformer;

[0011] The network switch is connected to the low-frequency signal source and the EMI measurement receiver via Ethernet.

[0012] Furthermore, the EMI measurement receiver is connected to the secondary winding of the coupling transformer via a coaxial cable and a coaxial cable adapter.

[0013] The beneficial effects of this invention are as follows: The use of an EMI measurement receiver for detection testing improves the accuracy of signal acquisition; the introduction of AMETEK's multi-functional AC / DC power supply system components replaces the coupling transformers for frequencies above 150kHz, which are unavailable domestically; and the use of an attenuator in the output link reduces the noise floor, thereby simplifying signal monitoring. Attached Figure Description

[0014] Figure 1 This is a block diagram of the calibration structure of the test system in this utility model;

[0015] Figure 2 This is a block diagram of the test structure of the test system in this utility model. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and reference numerals.

[0017] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0018] The terms “first,” “second,” “third,” etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0019] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0021] Example 1:

[0022] like Figure 1 As shown, the test system for voltage distortion spectrum testing from 150kHz to 500kHz includes a network switch, a low-frequency signal source, an audio power amplifier, a coupling transformer, an attenuator, a calibration resistor, and an EMI measurement receiver.

[0023] The low-frequency signal source is electrically connected to the audio power amplifier;

[0024] The audio power amplifier is electrically connected to the primary winding of the coupling transformer via an attenuator;

[0025] The calibration resistor is electrically connected to the secondary winding of the coupling transformer;

[0026] The EMI measurement receiver is electrically connected to the secondary winding of the coupling transformer;

[0027] The network switch is connected to the low-frequency signal source and the EMI measurement receiver via Ethernet.

[0028] This invention designs a test system using an EMI measurement receiver as the signal monitoring device, a low-frequency signal source and an audio power amplifier as the signal application devices, and a CN200N200 transformer from AMETEK's multi-functional AC / DC power supply test system as the transformer. Due to the low signal output requirements, an attenuator corresponding to the corresponding frequency band is added to the signal application link to increase the output of the signal source and power amplifier, and reduce the noise floor in the link, thus making it possible to conduct low-level voltage distortion spectrum tests from 150kHz to 500kHz.

[0029] The EMI measurement receiver is connected to the secondary side of the coupling transformer via a coaxial cable and a coaxial cable adapter.

[0030] Example 2:

[0031] like Figure 2 As shown, the test system for voltage distortion spectrum testing from 150kHz to 500kHz includes a network switch, a low-frequency signal source, an audio power amplifier, a coupling transformer, an attenuator, and a power supply for the test object.

[0032] The low-frequency signal source is electrically connected to the audio power amplifier;

[0033] The audio power amplifier is electrically connected to the primary winding of the coupling transformer via an attenuator;

[0034] The attenuator is connected to the positive terminal of the test sample, and the negative terminal of the test sample is connected to the power supply of the test sample.

[0035] The network switch is electrically connected to both the low-frequency signal source and the test computer.

[0036] The coupling transformer is a CN200N200 coupling transformer.

[0037] When setting up the system, the low-frequency signal source should be connected to the audio power amplifier using a coaxial cable. Then, the amplifier's output cable should be connected to the primary winding of the coupling transformer via an attenuator. Cables should then be routed from the secondary winding to the load. The EMI test receiver should be connected to the high-order line and return line of the secondary winding using a coaxial cable and an adapter to monitor the signal. Finally, the EMI test receiver and low-frequency signal source should be connected to a network switch via a network cable, thereby connecting to the test computer.

[0038] Before conducting the test, a simulated load with the same resistance as the test object is used for pre-test calibration, and the audio power amplifier is adjusted to a fixed amplification ratio. Then, a programmable signal source is used, and the receiver is adjusted to peak detection mode, calibrated according to the limits specified in the standard. The test software will automatically record the output of the low-frequency signal source. After calibration, the receiver connection is removed, and the high-level power supply line of the test object is connected to the calibration resistor. The calibrated signal output curve is automatically output, thus completing the test.

[0039] This utility model is not limited to the above-mentioned optional embodiments. Anyone can derive other forms of products under the guidance of this utility model. However, regardless of any changes made in its shape or structure, any technical solution that falls within the scope of the claims of this utility model shall be protected by this utility model.

Claims

1. A test system for voltage distortion spectrum testing from 150kHz to 500kHz, characterized in that, This includes network switches, low-frequency signal sources, audio power amplifiers, attenuators, coupling transformers, calibration resistors, and EMI measurement receivers; The low-frequency signal source is electrically connected to the audio power amplifier; The audio power amplifier is electrically connected to the primary winding of the coupling transformer via an attenuator; The calibration resistor is electrically connected to the secondary winding of the coupling transformer; The EMI measurement receiver is electrically connected to the secondary winding of the coupling transformer; The network switch is connected to the low-frequency signal source and the EMI measurement receiver via Ethernet.

2. The test system for voltage distortion spectrum testing from 150kHz to 500kHz according to claim 1, characterized in that, The coupling transformer is a CN200N200 coupling transformer.

3. The test system for voltage distortion spectrum testing from 150kHz to 500kHz according to claim 1, characterized in that, The EMI measurement receiver is connected to the secondary side of the coupling transformer via a coaxial cable and a coaxial cable adapter.

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