CN2697660Y - Tester for circuit board on-line investigating instrument - Google Patents
Tester for circuit board on-line investigating instrument Download PDFInfo
- Publication number
- CN2697660Y CN2697660Y CN 03247205 CN03247205U CN2697660Y CN 2697660 Y CN2697660 Y CN 2697660Y CN 03247205 CN03247205 CN 03247205 CN 03247205 U CN03247205 U CN 03247205U CN 2697660 Y CN2697660 Y CN 2697660Y
- Authority
- CN
- China
- Prior art keywords
- switching motherboard
- resistance
- measuring
- voltage table
- switch elements
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
The utility model discloses a tester for circuit board on-line investigating instrument, comprising a measuring driving board, a measuring bus line, and a switch board. The measuring driving board is provided with a voltage meter and a current source. The measuring driving board, the measuring bus line, and the switch board are controlled by the PC machine of the investigating instrument. The switch board is connected with the measured circuit board through the winding displacement and the needle bed. Both ends of the voltage meter on the measuring driving board and both ends of the current source are respectively connected with the relay switch on the switch board through the correspondent connecting line on the measuring bus line. The magnitude of voltage of the both ends of resistor of the voltage meter is measured through the independent circuit measuring so that when the on-line investigating instrument measures the small resistor, the magnitude of voltage of the measured resistor can accurately react to obtain the exact resistance value.
Description
Technical field
The utility model relates to a kind of printed circuit board (PCB) on-line testing instrument, specifically, relates to the proving installation of printed circuit board (PCB) on-line testing instrument.
Background technology
In the prior art, the PC of printed circuit board (PCB) on-line testing instrument connects measurement drive plate 2, the switching motherboard 3 of proving installation by control bus 4, measure between drive plate 2 and the switching motherboard 3 and be connected by measurement bus 5, the needle-bar 7 that is connected with resistance passes through winding displacement 8 and is connected with switching motherboard 3, as Fig. 1.In existing disclosed a kind of measurement mechanism, measure voltage table, current source two ends on the drive plate and connect the back earlier respectively and measure bus and is connected, and be connected with relay on the switching motherboard by the measurement bus, switching motherboard passes through winding displacement, needle-bar is connected with circuit board.Adopt this connected mode, through measuring, on the switching motherboard between the contact resistance of relay, switching motherboard and needle-bar on the resistance of winding displacement, junction block, the needle-bar contact resistance three sum of testing needle about one ohm.Resistance about this ohm when the resistance of tester test is big, though can in metering circuit, produce some dividing potential drops, considerably less, measured value is influenced very little, do not remember can ignore; But, when the measured resistance resistance is very little, as: during 0.5 Ω, dividing potential drop in the resistance generation on the metering circuit is very big, make the voltage that measuring voltage can't actual response measured resistance two ends, because the resistance of measured resistance is the ratio of tested voltage and electric current, then the resistance value of Huo Deing also will not be its resistance accurately.
The utility model content
The purpose of this utility model is to provide a kind of proving installation that can accurately measure the printed circuit board (PCB) on-line testing instrument of small resistor resistance.
The utility model is achieved in that a kind of proving installation of printed circuit board (PCB) on-line testing instrument, comprise and measure drive plate, measurement bus, switching motherboard, measure drive plate and be provided with voltage table, current source, described measurement drive plate, measurement bus, switching motherboard are controlled by the PC of tester, described switching motherboard is connected with the circuit-under-test plate by winding displacement, needle-bar, and the voltage table two ends on the described measurement drive plate, current source two ends are connected respectively with relay switch on the switching motherboard by the line of correspondence on the described measurement bus respectively.
Per four relay switches are formed a basic switch elements on the described switching motherboard, and the relay switch on each basic switch elements is respectively by the output terminal corresponding connection of bus with described voltage table, reometer; Each basic switch elements has an output terminal, has four basic switch elements on the described switching motherboard at least.
Voltage table of the present utility model is measured measured resistance both end voltage value by independent circuits, makes the on-line testing instrument when measuring small resistor, but the magnitude of voltage on the accurate response measured resistance, thus obtain resistance value accurately.
Description of drawings
Fig. 1 is a printed circuit board (PCB) on-line testing instrument fundamental diagram;
Fig. 2 is the equivalent circuit diagram during the proving installation test resistance in the prior art;
Equivalent circuit diagram when Fig. 3 is the utility model test resistance;
Fig. 4 is the utility model specific embodiment circuit diagram.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is done and to be described in further detail:
With reference to Fig. 2, R among the figure
A, R
A' be the equivalent resistance of the contact resistance of testing needle on the resistance of contact resistance, switching motherboard 3 and 7 winding displacements 6 of needle-bar of relay on the switching motherboard 3 and the needle-bar 7, be generally about one ohm, Rx is the equivalent resistance of measured resistance on the circuit board.Voltage table 9, current source 8 two ends connect respectively among Fig. 2, and its output terminals A, B pass through R
A, R
A' be connected with Rx, the voltage that voltage table 9 records is R
A, R
A', the voltage summation on the Rx, promptly the ratio of the current value of the reading of voltage table 9 and current source 8 is R
A, R
A', the Rx sum.If the resistance of Rx is than R
A, R
A' big a lot, R then
A, R
A' can ignore and not remember, measured value can react the resistance of Rx more accurately; If measured resistance Rx resistance and R
A, R
A' resistance is approaching even littler, R then
A, R
A' can not ignore and do not remember, the actual resistance of measured value and Rx can differ greatly.
With reference to Fig. 3, the voltage table 9 on the measurement drive plate 2 of proving installation 1, current source 8 output terminals A, B, C, D respectively with measure bus 5 on line A0, B0, C0, D0 be connected; On switching motherboard 3, each four relay switch K
A1, K
B1, K
C1, K
D1And K
A2, K
B2, K
C2And K
D2, K
A3, K
B3, K
C3And K
D3, K
A4, K
B4, K
C4, K
D4Form a basic switch elements 10,11,12,13, relay switch on each basic switch elements is respectively by line A1, B1, C1, D1 and A2, B2, C2 and D2, A3, B3, C3 and D3, A4, B4, C4, D4 are connected with bus 5, promptly with described voltage table 9 two ends, the corresponding connection in reometer 8 two ends, each basic switch elements 10,11,12,13 has output terminal CH1, a CH2, CH3, CH4; Have four basic switch elements on the described switching motherboard at least.Described measurement drive plate 2, the closure of measuring the interior relay switch of each basic switch elements on bus 5, the switching motherboard, disconnection realize by PC control respectively.
Fig. 4 is the utility model equivalent circuit diagram, R among the figure
A, R
A', R
B, R
B' be the equivalent resistance of the contact resistance of testing needle on the contact resistance of relay on the switching motherboard and the needle-bar, Rx is the equivalent resistance of measured resistance on the circuit board.Output terminals A, the B of current source 8 pass through R
A, R
A' be connected with Rx, output terminal C, the D of voltage table 9 pass through R
B, R
B' be connected with Rx.Proving installation adopts such method of attachment, though voltage table 9 output terminal C, D pass through R
B, R
B' be connected with Rx, but because the internal resistance of voltage table is very big, generally be not less than ten megohms, this loop is equivalent to open circuit, the resistance value that is obtained by the ratio of the magnitude of voltage of voltage table 9 and the current value of current source 8 make the reading of voltage table equal the voltage at Rx two ends substantially, so can be reacted the resistance of tested small resistor Rx accurately.
The utility model course of work is: with reference to accompanying drawing 3,4, the action of the relay switch on the voltage table on the measurement drive plate of proving installation, current source, measurement bus, the switching motherboard in the basic switch elements is realized by PC control.Basic switch elements on the PC gauge tap plate, make a relay switch closure in the basic switch elements as required, the output terminal that is basic switch elements can correspondingly as required be exported a voltage table end or current source end, so per four basic switch elements can be formed a measuring unit, as the relay switch K of basic switch elements 10,11,12,13
A1, K
B2, K
C3, K
D4Respectively closed, output terminal CH1, CH2 and CH3, CH4 corresponding current source and voltage table two ends are connected with measured resistance on the circuit board by winding displacement, needle-bar, and realization is to the measurement of test resistance.
Claims (2)
1, a kind of proving installation of PCB Online testing instrument, comprise the measurement drive plate, measure bus, switching motherboard, measure drive plate and be provided with voltage table, current source, described measurement drive plate, measure bus, switching motherboard is by the PC control of tester, described switching motherboard passes through winding displacement, needle-bar is connected with the circuit-under-test plate, it is characterized in that: measure the voltage table two ends on the drive plate, the current source two ends are connected described voltage table by measuring line corresponding on the bus respectively with relay switch on the switching motherboard respectively, reometer is connected with the measured resistance two ends by different independent loops respectively.
2, proving installation according to claim 1, it is characterized in that: per four relay switches are formed a basic switch elements on the described switching motherboard, and the relay switch on each basic switch elements is respectively by the output terminal corresponding connection of bus with described voltage table, reometer; Each basic switch elements has an output terminal, has four basic switch elements on the described switching motherboard at least.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03247205 CN2697660Y (en) | 2003-06-16 | 2003-06-16 | Tester for circuit board on-line investigating instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03247205 CN2697660Y (en) | 2003-06-16 | 2003-06-16 | Tester for circuit board on-line investigating instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2697660Y true CN2697660Y (en) | 2005-05-04 |
Family
ID=34755304
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03247205 Expired - Fee Related CN2697660Y (en) | 2003-06-16 | 2003-06-16 | Tester for circuit board on-line investigating instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2697660Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100489549C (en) * | 2005-08-26 | 2009-05-20 | 鸿富锦精密工业（深圳）有限公司 | Wire short /open circuit test set |
| CN101281232B (en) * | 2008-05-22 | 2010-06-02 | 株洲南车时代电气股份有限公司 | System and method for testing locomotive general-purpose circuit board function |
| CN101806857A (en) * | 2010-04-27 | 2010-08-18 | 中国人民解放军总装备部军械技术研究所 | Online fault diagnostic apparatus for circuit board |
| CN101490572B (en) * | 2006-05-12 | 2011-08-31 | 泰科电子公司 | Apparatus and method for detecting a location of conductive pins with respect to a circuit board |
-
2003
- 2003-06-16 CN CN 03247205 patent/CN2697660Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100489549C (en) * | 2005-08-26 | 2009-05-20 | 鸿富锦精密工业（深圳）有限公司 | Wire short /open circuit test set |
| CN101490572B (en) * | 2006-05-12 | 2011-08-31 | 泰科电子公司 | Apparatus and method for detecting a location of conductive pins with respect to a circuit board |
| CN101281232B (en) * | 2008-05-22 | 2010-06-02 | 株洲南车时代电气股份有限公司 | System and method for testing locomotive general-purpose circuit board function |
| CN101806857A (en) * | 2010-04-27 | 2010-08-18 | 中国人民解放军总装备部军械技术研究所 | Online fault diagnostic apparatus for circuit board |
| CN101806857B (en) * | 2010-04-27 | 2012-06-20 | 中国人民解放军总装备部军械技术研究所 | Online fault diagnostic apparatus for circuit board |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100489549C (en) | Wire short /open circuit test set | |
| CN203587761U (en) | Frequency converter mainboard tester | |
| CN202018494U (en) | Four-wire printed circuit board (PCB) test jig | |
| CN2874526Y (en) | GPS navigation plate detector | |
| CN111505562B (en) | Test system for metering performance self-monitoring capability of electric energy meter | |
| CN204595098U (en) | Micro-resistance testing device | |
| CN112379251A (en) | Relay circuit fault testing system and method | |
| CN110196381A (en) | A kind of cable general purpose automatic test system based on cpci bus | |
| CN2697660Y (en) | Tester for circuit board on-line investigating instrument | |
| CN208350898U (en) | A kind of quantum chip port impedance test device | |
| CN112526443A (en) | Testing device with error self-detection function for electric energy meter | |
| CN201852886U (en) | Multifunctional earth resistance tester | |
| CN105021919B (en) | Capacitance plate test card, test macro | |
| CN110412354A (en) | A kind of flat wire cable length direct current resistance m easurem ent device and measurement method | |
| CN208537602U (en) | A kind of emulation clamp on amperemeter | |
| CN201535784U (en) | Aging test substrate | |
| CN105890808A (en) | Temperature calibrator for main transformer | |
| CN220671612U (en) | Device for calibrating fuel cell impedance measurement | |
| CN201355528Y (en) | Multimeter demonstrator | |
| CN219417621U (en) | Transformer test fixture for single-phase intelligent ammeter | |
| CN209231421U (en) | A kind of feature resistance value is tested automatically and judgement system | |
| CN216816833U (en) | Comprehensive tester for electricity inspection | |
| CN220305454U (en) | Sectional program type wire needle test fixture | |
| CN220626600U (en) | Structure for detecting connection and conduction of stepping motor | |
| CN219121512U (en) | Thing networking water gauge detects frock |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |