CN201477129U - Measuring system capable of realizing interface discharge - Google Patents
Measuring system capable of realizing interface discharge Download PDFInfo
- Publication number
- CN201477129U CN201477129U CN2009201607548U CN200920160754U CN201477129U CN 201477129 U CN201477129 U CN 201477129U CN 2009201607548 U CN2009201607548 U CN 2009201607548U CN 200920160754 U CN200920160754 U CN 200920160754U CN 201477129 U CN201477129 U CN 201477129U
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- discharge tip
- interface
- discharge
- tip
- ground
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Abstract
A measuring system capable of realizing interface discharge comprises an interface (20), an interface circuit (21), and a measuring instrument (22). The interface (20) comprises a signal interface terminal (201) and a ground interface terminal (202). The interface circuit (21) comprises a first discharge tip (211), a second discharge tip (212), a discharge clearance (213), and a welding-resistant window (214), wherein the first discharge tip (211) is connected with the signal interface terminal (201); the second discharge tip (212) is connected with the ground interface terminal (202); the welding-resistant window (214) leads the first discharge tip (211), the second discharge tip (212) and the discharge clearance (213) to be sufficiently exposed in the air; and the size of the discharge clearance (213) is adjusted according to safety standard or practical design requirement. When the interface (20) generates static charges, the discharge tip breaks down the air and discharges to the ground, thus inhibiting the static discharge and protecting the internal parts of the instrument. The measuring system has the characteristics of simple structure, small input capacitance, low cost and the like.
Description
Technical field
The utility model relates to the system field of measuring electric variable, specially refers to the system field of the measurement electric variable that can realize the interface circuit discharge.
Background technology
In the daily life, static is ubiquitous, from the contact of two different objects with separate, to flowing of dry air, all be the reason of generation of static electricity.If condition is suitable, static moment can take place, and the generation of static also can work the mischief to electronic devices and components.Electrostatic Discharge can cause various problems to the harm that electronic devices and components cause, the vitals of serious damaged product.
The interface of various surveying instruments all is the place that possible suffer static discharge; when carrying static, people remove to contact tool interface system; or all may make the interface static electrification with the object contact tool interface system that carries static; and be sent to instrument internal; if do not protected, the device of instrument internal is easy to be damaged.In order to address the above problem, a kind of measuring system of can docking port discharging is provided in the prior art, 1 pair of this system briefly introduces below in conjunction with accompanying drawing.
Please refer to Fig. 1, system 1 comprises interface 10, interface circuit 11, oscillograph 12.Comprise signaling interface end 101 in the interface 10, ground interface end 102.Comprise voltage dependent resistor (VDR) 111 in the interface circuit 11.
Voltage dependent resistor (VDR) 111 is " resistance value becomes with voltage in certain current/voltage scope " resistance devices of " resistance value is to voltage-sensitive " in other words.Its maximum characteristics are the voltage above being added in it when being lower than its threshold value UN, and the electric current that flows through it is minimum, is equivalent to one and closes dead valve, and when voltage surpassed threshold value UN, the electric current that flows through it increased sharply, and is equivalent to valve open.System 1 utilizes this specific character of voltage dependent resistor (VDR) 111 just, and it is arranged between signaling interface end 101 and the ground interface end 102.When if interface circuit 10 suffers static discharge, the resistance of voltage dependent resistor (VDR) 111 sharply diminishes, and electrostatic induced current flows to ground by voltage dependent resistor (VDR) 111, thereby has protected the safety of the device of interface circuit 10 back.
In system 1, interface circuit 10 is mainly used in and receives various input signals, and it can be the signal input part of instrument, SMA, input interfaces such as SMB or USB.Surveying instrument 12 can be various electric measuring instruments such as oscillograph, multimeter or signal generator.
As seen, prior art above-mentioned can play a protective role to the static discharge of measuring equipment.But, for some measuring equipments, because high resistant input, the size of input capacitance is bigger to the bandwidth influence, so if the voltage dependent resistor (VDR) electric capacity that connects between signaling interface end 101 and the ground interface end 102 is bigger, will have influence on the input capacitance of interface 10, so that reduce bandwidth, thus bring difficulty to design.If address the above problem, just need select the especially little voltage dependent resistor (VDR) of electric capacity for use, but such voltage dependent resistor (VDR) price general charged is all higher.
The utility model content
The purpose of this utility model is to overcome the shortcoming that exists in the prior art, provides a kind of usefulness can realize the measuring system of interface circuit discharge.
A kind of measuring system that realizes the interface circuit discharge, comprise an interface, one interface circuit, one surveying instrument, described interface comprises that one is used for the signaling interface end of received signal, and one is used for the ground interface end of ground connection, and described interface circuit is connected in the middle of described interface and the described surveying instrument, described signaling interface end is delivered to described surveying instrument with the signal that receives
In described interface circuit, comprise one first discharge tip, one second discharge tip, one discharging gap and a welding resistance window, described first discharge tip is connected with described signaling interface end, described second discharge tip is connected with described ground interface end, described first discharge tip is not connected with described second discharge tip, the not link of described first discharge tip is relative with the not link of described second discharge tip, described discharging gap is in the not link and not between the link of described second discharge tip of described first discharge tip, described welding resistance window covers described first discharge tip, above described second discharge tip and the described discharging gap
Described first discharge tip and described second discharge tip are discharged when described interface produces static over the ground,
Described welding resistance window fully is exposed in the air described first discharge tip, described second discharge tip and described discharging gap.
Measuring system described in the utility model, described first discharge tip and second discharge tip can be made of the PCB cabling.
Measuring system described in the utility model not only can realize interface circuit discharge, and has simple in structurely, and input capacitance is little, lower-price characteristic.
Description of drawings
Fig. 1 is the structural representation of measuring system 1 in the prior art.
Fig. 2 is the structural representation of measuring system 2 in the utility model most preferred embodiment.
Fig. 3 is the stereographic map of straight type bnc interface 3 in the most preferred embodiment.
Fig. 4 is the structural representation of BNC pad 4 in the most preferred embodiment.
Embodiment
Below in conjunction with description of drawings preferred forms of the present utility model.
Please refer to Fig. 2, the measuring system 2 that present embodiment is selected comprises interface 20, interface circuit 21, oscillograph 22.Interface 20 comprises signaling interface end 201, ground interface end 202, and interface circuit 21 comprises first discharge tip 211, the second discharge tip 212, discharging gap 213 and the welding resistance window 214.
Wherein, signaling interface end 201 is connected with oscillograph 22, ground interface end 202 is connected with ground, first discharge tip 211 is connected with signaling interface end 201, second discharge tip 212 is connected with ground interface end 202, discharging gap 213 is between first discharge tip 211 and second discharge tip 212, welding resistance window 214 cover first discharge tip 211, second discharge tip 212 and discharging gap 213 above.
In the present embodiment,
Signaling interface end 201 is used for received signal, and it is sent in the oscillograph 22, carry out signal Processing, first discharge tip 211 and second discharge tip 212 are discharged over the ground by discharging gap 213 when static takes place interface 20, welding resistance window 214 fully is exposed in the air first discharge tip 211, second discharge tip 212 and discharging gap 213, is beneficial to discharge.
In the present embodiment,
Please refer to Fig. 3, interface 20 is selected oscillographic signal input interface for use, promptly straight type bnc interface, and this straight type bnc interface 3 comprises that signal connects pin 31, grounding pin 32, grounding pin 33, grounding pin 34 and grounding pin 35.Wherein signal connects pin 31 and is used for received signal, grounding pin 32, and grounding pin 33, grounding pin 34 is connected with ground respectively with grounding pin 35.
In the present embodiment,
Please refer to Fig. 4, BNC pad 4 comprises welding hole 41, welding hole 42, welding hole 43, welding hole 44, welding hole 45, first discharge tip 211, second discharge tip 212 and welding resistance window 214.
Mode by the PCB cabling makes welding hole 41 and welding hole 42 stretch out first discharge tip 211 and second discharge tip 212 respectively, and welding resistance window 214 is exposed in the air first discharge tip 211 and second discharge tip 212, is not covered by solder mask.Here said solder mask is to be used for applying solder resist materials such as welding resistance green oil, thereby prevents that the place that does not need to weld is infected with scolding tin.Welding resistance window 214 is meant the place of exposing the needs welding on solder mask, and these places do not need to apply solder resist materials such as welding resistance green oil.
In the present embodiment,
In conjunction with reference to figure 3 and Fig. 4, the signal of straight type bnc interface 3 connects pin 31, grounding pin 32, and grounding pin 33, grounding pin 34 and grounding pin 35 are connected with welding hole 41, welding hole 42, welding hole 43, welding hole 44 and the welding hole 45 of BNC pad 4 respectively.And welding hole 43, welding hole 44 and welding hole 45 are identical with the effect of welding hole 42.
In the present embodiment,
Putting a gap 213 is to obtain according to the safety standard that concrete designing requirement maybe should be followed, for example, can carry out qualitative calculating according to the creepage distance of discharging gap in " the safety requirements part 1 of GB4793.1-2007 measurement, control and laboratory electrical installation: general requirement ", concrete distance can thereby whether the observation leakage current reaches the safety current that needs obtain by adding high pressure on straight type bnc interface 3.
When interface 20 has static to occur, gather a large amount of electric charges on first discharge tip 211 and second discharge tip 212, when acquiring a certain degree, the air between first discharge tip 211 and second discharge tip 212 is breakdown, discharge over the ground, thereby effectively suppressed static discharge.
Because the relative area of first discharge tip 211 and second discharge tip 212 is very little, the stray capacitance between them is just very little, so very little to the influence of oscillograph input capacitance.
Explanation as an example, interface 20 can be the interface of various electronic measuring instruments, SMA for example, interfaces such as SMB or USB.
Explanation as an example, interface circuit 21 can be an input amplifying circuit, communication interface circuit or driving circuit etc.
Explanation as an example, first discharge end 211 and second discharge end 212 can be made of the PCB cabling, also can be made of other modes, as long as two discharge ends are that copper sheet is made, and two discharge ends get final product relatively.
Above embodiment only is used to illustrate the utility model, but not is used to limit the utility model.
Claims (2)
1. measuring system that can realize interface discharge, comprise an interface, one interface circuit, one surveying instrument, described interface comprises that one is used for the signaling interface end of received signal, and one is used for the ground interface end of ground connection, and described interface circuit is connected in the middle of described interface and the described surveying instrument, described signaling interface end is delivered to described surveying instrument with the signal that receives
It is characterized in that, in described interface circuit, comprise one first discharge tip, one second discharge tip, one discharging gap and a welding resistance window, described first discharge tip is connected with described signaling interface end, described second discharge tip is connected with described ground interface end, described first discharge tip is not connected with described second discharge tip, the not link of described first discharge tip is relative with the not link of described second discharge tip, described discharging gap is in the not link and not between the link of described second discharge tip of described first discharge tip, described welding resistance window covers described first discharge tip, above described second discharge tip and the described discharging gap
Described first discharge tip and described second discharge tip are discharged when described interface produces static over the ground,
Described welding resistance window fully is exposed in the air described first discharge tip, described second discharge tip and described discharging gap.
2. measuring system according to claim 1 is characterized in that, described first discharge tip and second discharge tip are made of the PCB cabling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201607548U CN201477129U (en) | 2009-06-25 | 2009-06-25 | Measuring system capable of realizing interface discharge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201607548U CN201477129U (en) | 2009-06-25 | 2009-06-25 | Measuring system capable of realizing interface discharge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201477129U true CN201477129U (en) | 2010-05-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201607548U Expired - Lifetime CN201477129U (en) | 2009-06-25 | 2009-06-25 | Measuring system capable of realizing interface discharge |
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| Country | Link |
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| CN (1) | CN201477129U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103473203A (en) * | 2013-09-12 | 2013-12-25 | 上海斐讯数据通信技术有限公司 | USB (universal serial bus) interface circuit with electrostatic protection |
-
2009
- 2009-06-25 CN CN2009201607548U patent/CN201477129U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103473203A (en) * | 2013-09-12 | 2013-12-25 | 上海斐讯数据通信技术有限公司 | USB (universal serial bus) interface circuit with electrostatic protection |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100519 |
|
| DD01 | Delivery of document by public notice | ||
| DD01 | Delivery of document by public notice |
Addressee: Beijing Rigol Technologies, Inc. Document name: Notification of Expiration of Patent Right Duration |