CN101226225B - Method for searching channel number of tester on-line - Google Patents
Method for searching channel number of tester on-line Download PDFInfo
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- CN101226225B CN101226225B CN2008100652226A CN200810065222A CN101226225B CN 101226225 B CN101226225 B CN 101226225B CN 2008100652226 A CN2008100652226 A CN 2008100652226A CN 200810065222 A CN200810065222 A CN 200810065222A CN 101226225 B CN101226225 B CN 101226225B
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Abstract
The invention discloses a channel number search method of online tester, belonging to the online test technical field of printed circuit board, which mainly comprises arranging multiple channel board in an online tester, turning on the relays on all channel boards, turning off some relays, searching the target channel board of the grounding channel, and recording the serial number of the target channel board, searching the target relay on the target channel board relative to the grounding channel, and recording the serial number of the target relay, calculating out the channel number of the grounding channel. The invention can reduce the comparison times between public terminal voltage and zero threshold value in the search of channel number, to improve search speed, prolong the service life of online tester and improve search efficiency.
Description
Technical field
The present invention relates to the on-line testing field of printed circuit board (PCB), relate in particular to a kind of technology of on the on-line testing instrument, searching channel number fast.
Background technology
On-line testing (In-Circuit Test, ICT) be by to the electrical property of online components and parts and be electrically connected and test, checking whether good whether printed circuit board (PCB) exist defective and components and parts a kind of standard testing means, it mainly checks the opening of online single components and parts and each circuit network, short-circuit conditions.The on-line testing instrument provides the equipment of on-line testing.
The on-line testing instrument is implanted into a probe at each circuit network of tested veneer, and each probe connects passage of online tester.The on-line testing instrument reach the purpose of the tested veneer network voltage of control, and each passage has its position in whole on-line testing instrument of a channel number sign by the voltage on the passage control probe.A kind of structure of on-line testing instrument, as depicted in figs. 1 and 2, there are 4 channel plates to be inserted on the backboard side by side in this on-line testing instrument, every channel plate top connects the interface needle-bar by card extender, passage is distributed on the interface needle-bar, and each passage is derived by probe, when needs are searched the channel number of certain passage, only need probe ground connection, check the channel number that shows in the function software again interface channel.
Channel plate is DR plate (Driver/Receiver, a driving/dash receiver), is to be used for the veneer of control channel in the on-line testing instrument, and it is made up of a large amount of relays, and the general a plurality of passages of channel plate may command have the polylith channel plate in the on-line testing instrument.
It is a kind of debugging acid of on-line testing instrument that channel number is searched, and is used to search the channel number of unknown passage or the connection state of known passage.The principle of work that channel number is searched is as follows: in the on-line testing instrument, each passage connects the F node relay (Node Relay) on the channel plate, F node relay is the node relay on the F bus, it is the F relay, opening and closing by the F relay can control channel voltage, find the F relay of passage correspondence, just can calculate the channel number of this passage.
If the total n piece channel plate of on-line testing instrument, every channel plate has m F relay, and all F relays have a common port, as shown in Figure 3.The flow process of searching channel number on the on-line testing instrument is as shown in Figure 4: at first with the probe ground connection of interface channel, a F relay K xy of closed then a certain channel plate, Kxy represents the order sequence number of F relay, wherein x is the serial number of channel plate, and y is the serial number of the F relay in the channel plate; Measure the common port voltage u of F relay; If common port voltage is less than μ, μ is the no-voltage threshold value, illustrates that F relay K xy links to each other with tested passage, again according to described channel plate x, and the serial number y of F relay K xy on affiliated channel plate, calculating channel number, the computing formula of channel number is x * m+y; If common port voltage is more than or equal to μ, illustrate then that F relay K xy does not have with passage to be connected, then continue to close next F relay, until the common port voltage of F relay less than μ; All closed as all F relays, also do not find the F relay of a common port voltage less than u, the passage that explanation will be searched is invalid.
The lookup method of prior art lower channel number is, calculates according to the serial number Kxy of F relay.In the general passage search procedure, adopt order from small to large to close to the F relay: promptly, close earlier on No. 0 channel plate No. 0 F relay k00, k01 ... k0m changes F relay k10, the k11 of No. 1 channel plate then ... m F relay K nm on the n channel plate.
At the initial stage of on-line testing technical development,,, there is not obvious defects with the method for determining channel number according to the orderly close-down F relay that arrives from small to large because port number is less.But along with the development of on-line testing technology, the total number of channels of on-line testing instrument is increasing in recent years, develops into present 4000 more than the passage by 1000 passages in the past, makes existingly to determine that the method for channel number shows following drawback:
1. the time of on average searching passage is longer, particularly works as channel plate more for a long time, and total number of channels increases, and need repeatedly measure comparative voltage, and search efficiency is lower.
2. because the F relay is more, cause frequent the closing and opening of relay needs of channel plate, strengthened loss, greatly reduce the serviceable life of on-line testing instrument the on-line testing instrument.
Therefore, there is defective in prior art, needs further improvement and develops.
Summary of the invention
The object of the present invention is to provide a kind of channel number lookup method of on-line testing instrument, when making the channel number of searching the ground connection passage, can reduce the number of times of closing and open relay, obtain the channel number of passage fast.
Technical scheme of the present invention is as follows:
A kind of channel number lookup method of on-line testing instrument, it mainly may further comprise the steps:
A, be provided with the polylith channel plate in the on-line testing instrument, open the relay on all channel plates, the relay on the closed portion channel plate is searched the purpose channel plate at described ground connection passage place, and writes down the serial number of described purpose channel plate;
B, search purpose relay corresponding on the described purpose channel plate, and write down the serial number of described purpose relay with described ground connection passage;
C, calculate the channel number of described ground connection passage;
Wherein, described step C calculates according to following formula:
P＝x×m+y
In the following formula, P represents the channel number of ground connection passage, and x represents the serial number of purpose channel plate, and m represents the number of relay on the every channel plate, and y represents the serial number of purpose relay on the purpose channel plate.
Described lookup method, wherein, the process of searching described purpose channel plate in the described steps A specifically comprises:
The common port voltage of A1, measuring relay, and the size of more described common port voltage and no-voltage threshold value, if described common port voltage is less than the no-voltage threshold value, the purpose channel plate of described ground connection passage is arranged in the part channel plate of cut-off, otherwise is arranged in the part channel plate of opening;
A2, judge whether the described purpose channel plate of successful search, if then successful search is to described purpose channel plate; If not, open the relay on all channel plates, close the relay of the inner subchannel plate of described purpose channel plate in-scope, return steps A 1 again and search the purpose channel plate.
Described lookup method, wherein, described step B specifically comprises:
B1, open relays all on all channel plates, close the part relay on the wherein said purpose channel plate;
The common port voltage of B2, measuring relay, and the size of comparison and described common port voltage and no-voltage threshold value, if described common port voltage is less than the no-voltage threshold value, the purpose relay of described ground connection passage is arranged in the part relay of cutting out, otherwise is arranged in the part relay of opening;
B3, judge whether the described purpose relay of successful search, if write down the serial number of described purpose relay, if not, open the relay on all channel plates, close the part relay in the described purpose relay in-scope, return step B2 again and search the purpose relay.
Described lookup method, wherein, in the described steps A, described part channel plate of closing is half of all channel plates.
Described lookup method, wherein, in the described steps A 2, the part channel plate of described closed relay is half of described purpose channel plate place channel plate scope.
Described lookup method, wherein, among the described step B1, described part relay of cutting out is half of relay on the described purpose channel plate.
Described lookup method, wherein, among the described step B3, described part relay of cutting out is half in the described purpose relay scope.
Described lookup method, wherein, described relay is a F node relay.
Compared with prior art, the invention provides a kind of channel number lookup method of on-line testing instrument, adopted and opened all relays, close the relay on the polylith channel plate simultaneously, the common port voltage of measuring relay afterwards, by comparing common port voltage and zero gate limit value voltage, found the purpose channel plate at ground connection passage place; According to identical method of testing, found the purpose relay of ground connection passage at the purpose channel plate then; Last serial number x according to the purpose channel plate, the serial number y of purpose relay, and the number m of relay on the purpose channel plate, calculated the channel number of ground connection passage according to formula x * m+y, thereby significantly reduced the number of times of measuring comparative voltage, improve the efficient of searching, prolonged the serviceable life of on-line testing instrument, saved cost.
Description of drawings
Fig. 1 is under the prior art, the distribution plan of channel plate in the on-line testing instrument;
Fig. 2 is under the prior art, the distribution schematic diagram of F relay on the single channel plate plate;
Fig. 3 is under the prior art, and in the channel number search procedure, the F relay is according to the arrangement synoptic diagram of serial number;
Fig. 4 is under the prior art, carries out the process flow diagram that channel number is searched according to F relay serial number;
Fig. 5 a and Fig. 5 b are that the present invention carries out the process flow diagram that channel number is searched.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present invention is described in further detail.
The channel number lookup method of on-line testing of the present invention in search procedure, all dwindles half than the last time with each seek scope, and this method is called the binary search method.
Channel number lookup method of the present invention was divided into for three steps:
The first step adopts the binary search method earlier, searches the serial number of the affiliated purpose channel plate of ground connection passage, and described ground connection passage is the arbitrary passage on the channel plate.
Second step, adopt the binary search method, search on the described purpose channel plate serial number of the purpose relay corresponding with described ground connection passage.
In the 3rd step,, calculate the channel number of described ground connection passage according to the computing formula of channel number.
If the total n piece channel plate of on-line testing instrument, every channel plate has m F relay.Adopt the binary search method, when searching the purpose channel plate under the described ground connection passage, beginning the region of search most is n; Close the F relay on the first half channel plate earlier, i.e. relay on the 1-n/2 channel plate, the voltage u of measuring relay common port again, u is called common port voltage; Then common port voltage u and no-voltage threshold value μ are compared, obtain two kinds of results:
1,, can search in [1, n/2] interval employing binary search method that continues again narrowing down to [1, n/2] interval between the seek area if u＜μ illustrates that described ground connection passage is positioned at [0, n/2] between the seek area.
2,, can search in [n/2+1, n] interval employing binary search method that continues again narrowing down to [n/2+1, n] interval between the seek area if u＞μ or u=μ illustrate that described ground connection passage is positioned at [n/2+1, n] between the seek area.
Channel number lookup method of the present invention, common port voltage of every survey dwindles half between the seek area, and for bigger n, it is faster obviously to search channel number in order than prior art.
If be reduced into an x channel plate between the seek area, this moment is if u＜μ illustrates then and search successfully that described ground connection passage is positioned at the x channel plate; If u＞μ or u=μ illustrate and search failure, promptly do not have described ground connection passage, or described ground connection passage connects unusual.
In like manner search in the described x channel plate, with described ground connection passage corresponding target F relay.Beginning most the region of search is m, closes half F relay, i.e. 1-m/2 F relay in the described x channel plate earlier; Measure common port voltage u; Described common port voltage u and zero gate limit value voltage μ are compared, and its processing procedure is consistent with the method for searching described x channel plate; Search repeatedly, the y F relay that obtains in the described x channel plate is connected with described ground connection passage.
At last, according to the computing formula P=x * m+y of channel number, calculate the channel number P of described ground connection passage.
A specific embodiment of the present invention is as follows, and the on-line testing instrument has 64 channel plates, and promptly n=64 according to the order that channel plate is arranged, is No. 1, No. 2 successively ... No. 64; Every channel plate has 64 F relays, i.e. m=64, and according to F relay putting in order on channel plate, its serial number on single channel plate is No. 1, No. 2 successively ... No. 64.The channel number lookup method of the passage that is connected with probe on the on-line testing instrument, promptly the channel number lookup method of ground connection passage shown in Fig. 5 a and Fig. 5 b, specifically comprises the steps:
501, with described probe ground connection, just with described passage ground connection, promptly the passage that will search is the ground connection passage.
502, seek scope of the present invention is described 64 channel plates, is provided with between described purpose channel plate seek area, and minimum value is represented with low between described purpose channel plate seek area, and the initial value that described low is set is 1; Maximal value between described purpose channel plate seek area represents that with high the initial value that described high is set is 64, and described purpose channel plate is expressed as [1,64] between the seek area.
503, open the F relay on all channel plates.The F relay that the present invention opens on all channel plates is disposable opening, and compares with opening the F relay under the prior art one by one, and is easy to operate, and saved the time of cost in the test.
504, the intermediate value between described purpose channel plate seek area represents that with mid the value that mid is set is (low+high-1)/2.
505, adopt the binary search method, the F relay on all channel plates in [low, mid] between closed described purpose channel plate seek area, promptly closing the F relay on half channel plate in the seek scope, specifically is No. 1 channel plate, No. 2 channel plates ... F relay on No. 32 channel plates.F relay on the closing passage plate of the present invention is disposable cutting out, with under the prior art one by one the F relay of closing passage plate compare, simplified operation, reduced the time that spends in the test process simultaneously.
506, the voltage of measuring relay common port, i.e. common port voltage u.
507, judge whether the size of low value between described purpose channel plate seek area and high value is identical, if vary in size, enter step 508, if size is identical, enter step 511.
508, the no-voltage threshold value μ of this preferred embodiment gets 0.5v, and whether more described common port voltage u is less than no-voltage threshold value μ.If, enter step 509, if not, enter step 510.
509, to reset between purpose channel plate seek area, method to set up is with the minimum value low between former purpose channel plate seek area, to give the minimum value low between new purpose channel plate seek area; With the mid value between former purpose channel plate seek area, give the maximal value high between new purpose channel plate seek area.Return step 503 then.
510, to reset between the seek area of purpose channel plate, method to set up is with the mid+1 value between described former purpose channel plate seek area, to give the minimum value low between new purpose channel plate seek area; With the maximal value high between former purpose channel plate seek area, give the maximal value high between new purpose channel plate seek area.Return step 503 then.
511, judge that common port voltage u whether less than no-voltage threshold value μ, if not, enters step 512, if enter step 513.
512, search failure, illustrate there is not described ground connection passage on the channel plate that perhaps described ground connection passage connects unusual.
513, expression has found the purpose channel plate of described ground connection passage, and the channel number of described purpose channel plate is the low value, gives x with the low value here.Be that described ground connection passage is positioned at the x channel plate.
514, on described x channel plate, search and the corresponding purpose F relay of described ground connection passage, shown in Fig. 5 b.In this preferred embodiment, the seek scope of purpose F relay is 64 F relays on the described x channel plate, minimum value between purpose relay seek area is represented with low, maximal value represents that with high described purpose relay is expressed as [low, high] between the seek area.
515, the initial value that low between described purpose relay seek area is set is 1, and the initial value of high is 64.
516, open the F relay on all channel plates.
517, the intermediate value between described purpose relay seek area represents that with mid the value that mid is set is (low+high-1)/2.
518, the F relay between closed purpose relay seek area in [low, mid] promptly cuts out No. 1 F relay, No. 2 F relays on the described x channel plate ... No. 32 F relays.
519, measure common port voltage u.
520, judge whether the size of the low value search purpose relay interval and high value is identical, if big or small identical, enter step 524, if vary in size, enter step 521.
521, whether more described common port voltage u is less than no-voltage threshold value μ.If, enter step 522, if not, enter step 523.
522, reset between described purpose relay seek area, adopt the binary search method, with the minimum value low between former purpose relay seek area, give the minimum value low between new purpose relay seek area; With the mid value between former purpose relay seek area, give the maximal value high between new purpose relay seek area.Return step 516 then.
523, reset between described purpose relay seek area, adopt the binary search method, with the mid+1 value between former purpose relay seek area, give the minimum value low between new order relay seek area; With the maximal value high between former purpose relay seek area, give the maximal value high between new order relay seek area.Return step 516 then.
524, expression has found the purpose F relay of described ground connection passage, and described purpose F relay is the low value at the serial number of x channel plate, gives y with the low value here, and promptly described ground connection passage is connected with y F relay on the described x channel plate.
525, according to the computing formula x * m+y of channel number, calculate the channel number of described ground connection passage.
The channel number lookup method of on-line testing instrument of the present invention, adopt the binary search method at first to find out the purpose channel plate of ground connection passage, and then on described purpose channel plate, find the purpose F relay that is connected with described ground connection passage, use serial number x, the serial number y of purpose F relay on the purpose channel plate of described purpose channel plate at last, obtain the channel number of ground connection passage according to the computing formula x * m+y of channel number.The present invention has significantly reduced the number of times of measuring common port voltage and comparing with the zero gate limit value, thereby has improved seek rate in the search procedure of channel number, has prolonged the serviceable life of on-line testing instrument, has improved search efficiency simultaneously.
Should be understood that above-mentioned statement at preferred embodiment of the present invention is comparatively detailed, can not therefore think the restriction to scope of patent protection of the present invention, scope of patent protection of the present invention should be as the criterion with claims.
Claims (8)
1. the channel number lookup method of an on-line testing instrument, it mainly may further comprise the steps:
A, be provided with the polylith channel plate in the on-line testing instrument, open the relay on all channel plates, the relay on the closed portion channel plate is searched the purpose channel plate at ground connection passage place, and writes down the serial number of described purpose channel plate;
B, search purpose relay corresponding on the described purpose channel plate, and write down the serial number of described purpose relay with the ground connection passage;
C, calculate the channel number of ground connection passage;
Wherein, described step C calculates according to following formula:
P＝x×m+y
In the following formula, P represents the channel number of ground connection passage, and x represents the serial number of purpose channel plate, and m represents the number of relay on the every channel plate, and y represents the serial number of purpose relay on the purpose channel plate.
2. lookup method according to claim 1 is characterized in that, the process of searching described purpose channel plate in the described steps A specifically comprises:
The common port voltage of A1, measuring relay, and the size of more described common port voltage and no-voltage threshold value, if described common port voltage is less than the no-voltage threshold value, the purpose channel plate of ground connection passage is arranged in the part channel plate of cut-off, otherwise is arranged in the part channel plate of opening;
A2, judge whether the described purpose channel plate of successful search, if then successful search is to described purpose channel plate; If not, open the relay on all channel plates, close the relay of the inner subchannel plate of described purpose channel plate in-scope, return steps A 1 again and search the purpose channel plate.
3. lookup method according to claim 1 is characterized in that, described step B specifically comprises:
B1, open relays all on all channel plates, close the part relay on the wherein said purpose channel plate;
The common port voltage of B2, measuring relay, and the size of more described common port voltage and no-voltage threshold value, if described common port voltage is less than the no-voltage threshold value, the purpose relay of ground connection passage is arranged in the part relay of cutting out, otherwise is arranged in the part relay of opening;
B3, judge whether the described purpose relay of successful search, if write down the serial number of described purpose relay, if not, open the relay on all channel plates, close the part relay in the described purpose relay in-scope, return step B2 again and search the purpose relay.
4. lookup method according to claim 1 is characterized in that, in the described steps A, the part channel plate of closing is half of all channel plates.
5. lookup method according to claim 2 is characterized in that, in the described steps A 2, the part channel plate of described closed relay is half of described purpose channel plate place channel plate scope.
6. lookup method according to claim 3 is characterized in that, among the described step B1, described part relay of cutting out is half of relay on the described purpose channel plate.
7. lookup method according to claim 3 is characterized in that, among the described step B3, described part relay of cutting out is half in the described purpose relay scope.
8. lookup method according to claim 1 is characterized in that, described relay is a F node relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100652226A CN101226225B (en) | 2008-01-29 | 2008-01-29 | Method for searching channel number of tester on-line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100652226A CN101226225B (en) | 2008-01-29 | 2008-01-29 | Method for searching channel number of tester on-line |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101226225A CN101226225A (en) | 2008-07-23 |
| CN101226225B true CN101226225B (en) | 2011-01-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008100652226A Expired - Fee Related CN101226225B (en) | 2008-01-29 | 2008-01-29 | Method for searching channel number of tester on-line |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102325201B (en) * | 2011-10-27 | 2013-10-09 | 珠海派诺科技股份有限公司 | Method for allocating network addresses to slave node equipment in Modbus communication network |
| CN107147457A (en) * | 2017-07-17 | 2017-09-08 | 中磊电子（苏州）有限公司 | A kind of channel scanning method, device and wireless device |
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