CN205426973U - Anti electromagnetic pulse coupling interference 's passive probe - Google Patents

Abstract

The utility model relates to a passive probe for resisting electromagnetic pulse coupling interference, which belongs to the field of testing the strong electromagnetic pulse radiation effect of electronic equipment. The male inner conductor of the joint is electrically connected to one end of the inner conductor of the signal transmission line, the female inner conductor of the joint is electrically connected to the braided layer of the signal transmission line, the grounding wire is electrically connected to the other end of the braided layer of the signal transmission line, and the clamp shield is sleeved on the signal transmission line The first and second test fixtures are electrically connected to the inner conductor of the signal transmission line and the ground wire respectively. The advantages are: compared with ordinary oscilloscope probes, it has obvious anti-electromagnetic pulse coupling interference characteristics in a strong electromagnetic pulse radiation environment, making the measured signal accurate and reliable; at the same time, the slidable horn-shaped shielding cover ensures good shielding for the test fixture The effect is convenient and the alligator clip is clamped on the test point.

Description

A Passive Probe Against Electromagnetic Pulse Coupling Interference

technical field

The utility model belongs to the field of testing the strong electromagnetic pulse radiation effect of electronic equipment, and relates to a passive probe capable of resisting electromagnetic pulse coupling interference in a strong electromagnetic pulse radiation environment.

Background technique

There are mainly two methods for the research on the electromagnetic pulse effect of electronic equipment: simulation and experiment. During the test, extracting the signal waveform when the electronic equipment is disturbed is an important way to analyze the mechanism of the electromagnetic pulse effect of electronic equipment.

At present, none of the existing test probes on the market considers the electromagnetic pulse protection design. The probe signal line and the test fixture couple large electromagnetic interference in the environment of strong electromagnetic pulse radiation, so that the test signal is submerged in the probe coupled electromagnetic interference, and it is impossible to extract effective signals. waveform. The coupled pulse interference may even cause the test equipment to fail and fail to work normally. Moreover, the existing telescopic hook probe cannot be effectively clamped on the test point when testing equipment with relatively large vibration, which brings inconvenience to the test.

The problems of the above-mentioned test probes make it impossible to effectively extract the signal waveform after the equipment is disturbed in the environment of strong electromagnetic pulse radiation, which brings difficulties to the analysis of the mechanism of the electromagnetic pulse effect of the equipment. As a result, the research on the electromagnetic pulse effect at the equipment level currently only stays at the extraction of the sensitive threshold of the equipment and Sensitive parts identified.

Contents of the invention

The utility model provides a passive probe resistant to electromagnetic pulse coupling interference to solve the problem that the existing test probe cannot extract effective signal waveforms due to coupled electromagnetic interference.

The technical scheme adopted by the utility model is: the male inner conductor of the joint is electrically connected with one end of the inner conductor of the signal transmission line, the female inner conductor of the joint is electrically connected with the braided layer of the signal transmission line, and the grounding wire is electrically connected with the other end of the braided layer of the signal transmission line , the shielding cover of the fixture is sleeved on the signal transmission line, and is electrically connected to the braided layer of the signal transmission line through the elastic reed; the test fixture 1 and the test fixture 2 are respectively electrically connected to the inner conductor of the signal transmission line and the grounding wire.

The joints described in the utility model adopt N-type or F-type joints, the male inner conductor of the joint is made of brass plated with silver, and the female inner conductor is made of beryllium bronze plated with silver.

The signal transmission line of the utility model uses a coaxial line.

Test fixture one or test fixture two described in the utility model adopts 35mm crocodile clip, and the material is brass plated with silver.

The fixture shielding cover of the utility model adopts a slidable trumpet-shaped shielding structure, and the material is nickel-plated brass. The inner wall of the shielding cover is uniformly coated with an EVA insulating layer, and the narrow mouth of the horn-shaped shielding cover is embedded with elastic reeds.

The grounding wire described in the utility model adopts copper-plated silver braided wire, and the length is 15cm.

The utility model has the advantages of novel structure, the use of the coaxial line and the fixture shielding cover has a good shielding effect on the probe signal line and the test fixture, and has obvious anti-electromagnetic pulse coupling interference characteristics in the environment of strong electromagnetic pulse radiation, so that the measured The signal is accurate and reliable; the crocodile clip structure can ensure a reliable electrical connection with the test point in equipment with large vibrations, and the slidable trumpet-shaped shielding structure not only ensures a good shielding effect on the test fixture, but also facilitates the crocodile clip to be clamped on the test point.

Description of drawings

Fig. 1 is a structural representation of the utility model;

Fig. 2 is the sectional structure schematic diagram of the joint of the present utility model;

Fig. 3 is a cross-sectional schematic diagram of the signal transmission line of the present invention,

Fig. 4 is a schematic cross-sectional structure diagram of the trumpet-shaped shielding cover of the present invention.

detailed description

The male inner conductor 101 of the joint 1 is electrically connected to one end of the inner conductor 201 of the signal transmission line 2, the female inner conductor 102 of the joint 1 is electrically connected to the braided layer 203 of the signal transmission line 2, and the other end of the grounding wire 5 is connected to the braided layer 203 of the signal transmission line 2 For electrical connection, the clamp shield 3 is sleeved on the signal transmission line, and is electrically connected to the braided layer 203 of the signal transmission line through the elastic reed 303; the first test fixture 4 and the second test fixture 6 are respectively electrically connected to the inner conductor 201 of the signal transmission line and the grounding wire 5 ;

The connector 1 adopts N-type or F-type connectors, the nominal impedance of the connector is 50Ω, the frequency range is DC-18G, the maximum standing wave ratio is 1.20, and the maximum insertion loss is 0.3dB;

The signal transmission line 2 uses an RG142 type coaxial cable, which is an inner conductor 201, an insulator 202, a braided layer 203, and an insulating layer 204 from the inside to the outside. The test bandwidth of the coaxial cable is 0-3GHz, the characteristic impedance is 50Ω, and the insertion loss is less than or equal to 0.7, the maximum standing wave ratio is less than or equal to 1.2, the length is 1.2m, and the two ends of the coaxial line are defined as one end and the other end;

The first test fixture 4 or the second test fixture 6 adopts a 35mm alligator clip, and the material is brass plated with silver;

The clamp shielding cover 3 adopts a slidable trumpet-shaped shielding structure, wherein the material of the shielding layer 301 is nickel-plated brass with a thickness of 1mm; The inner wall of the narrow mouth is embedded with an elastic reed 303;

The grounding wire 5 is a copper-plated silver braided wire with a length of 15 cm.

The male inner conductor 101 of the N(F) type joint is welded to the inner conductor 201 at one end of the RG142 type coaxial line, the female inner conductor 102 of the N(F) type joint is welded to the braid layer 203 at one end of the RG142 type coaxial line, N( The connection between the F) type joint and the RG142 type coaxial line is tightened with a seamless hollow metal hoop with a length of 1cm.

Remove the outer insulating layer 204 from the other end of the RG142-type coaxial line to expose the braided layer 203. The length of the insulating layer 204 removed is 17 cm, and the ground wire 5 is welded to the exposed RG142 at a distance of 15 cm from the other end of the RG142-type coaxial line. On the braided layer 203 of the type coaxial line, the solder joints are wrapped with PVC insulating tape, and the ground wire 5 is heat-shrinkable with polyolefin heat-shrinkable tubes.

The clamp shielding cover 3 is set on the other end of the RG142 type coaxial cable, and the elastic reed 303 on the inner wall of the narrow opening of the clamping shielding cover 3 is electrically connected to the braiding layer 203 of the RG142 type coaxial cable. Swipe up.

The first test fixture 4 and the second test fixture 6 are welded to the inner conductor 201 at the other end of the RG142 coaxial line and the ground wire 5 respectively.

Claims (6)

1. the passive probe of an electromagnetic pulse-resisting coupled interference, it is characterized in that: the positive inner wire of joint and inner wire one end electrical connection of signal transmssion line, the cloudy inner wire of joint and the braid electrical connection of signal transmssion line, the braid other end electrical connection of earth lead and signal transmssion line, fixture radome is socketed on signal transmssion line, is electrically connected with signal transmssion line braid by elastic spring；Test fixture one and test fixture two electrically connect with signal transmssion line inner wire and earth lead respectively.

A kind of passive probe of electromagnetic pulse-resisting coupled interference, it is characterised in that: described joint uses N-type or F type joint, and joint sun inner wire uses pyrite silver-plated, and cloudy inner wire uses beryllium-bronze silver-plated.

A kind of passive probe of electromagnetic pulse-resisting coupled interference, it is characterised in that: described signal transmssion line coaxial line.

A kind of passive probe of electromagnetic pulse-resisting coupled interference, it is characterised in that: described test fixture one or test fixture two use 35mm alligator clamp, and material is that pyrite is silver-plated.

A kind of passive probe of electromagnetic pulse-resisting coupled interference, it is characterized in that: described fixture radome uses the most tubaeform shielding construction, material is pyrite nickel plating, and radome inwall uniform application EVA insulate glue-line, and tubaeform radome slot is embedded with elastic spring.

A kind of passive probe of electromagnetic pulse-resisting coupled interference, it is characterised in that: described earth lead uses the silver-plated litzendraht wire of copper, a length of 15cm.