Warning: mysql_query() [function.mysql-query]: Unable to save result set in D:\wwwroot\2031\wwwroot\includes\db.inc.php on line 67
Database error: Invalid SQL: select count(id) from pwn_comment where pid='34505' and iffb='1'
MySQL Error: 1194 (Table 'pwn_comment' is marked as crashed and should be repaired)
#0 dbbase_sql->halt(Invalid SQL: select count(id) from pwn_comment where pid='34505' and iffb='1') called at [D:\wwwroot\2031\wwwroot\includes\db.inc.php:73] #1 dbbase_sql->query(select count(id) from {P}_comment where pid='34505' and iffb='1') called at [D:\wwwroot\2031\wwwroot\comment\module\CommentContent.php:65] #2 CommentContent() called at [D:\wwwroot\2031\wwwroot\includes\common.inc.php:518] #3 printpage() called at [D:\wwwroot\2031\wwwroot\comment\html\index.php:13]
Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in D:\wwwroot\2031\wwwroot\includes\db.inc.php on line 80

Warning: mysql_query() [function.mysql-query]: Unable to save result set in D:\wwwroot\2031\wwwroot\includes\db.inc.php on line 67
Database error: Invalid SQL: select * from pwn_comment where pid='34505' and iffb='1' order by id limit 0,10
MySQL Error: 1194 (Table 'pwn_comment' is marked as crashed and should be repaired)
#0 dbbase_sql->halt(Invalid SQL: select * from pwn_comment where pid='34505' and iffb='1' order by id limit 0,10) called at [D:\wwwroot\2031\wwwroot\includes\db.inc.php:73] #1 dbbase_sql->query(select * from {P}_comment where pid='34505' and iffb='1' order by id limit 0,10) called at [D:\wwwroot\2031\wwwroot\comment\module\CommentContent.php:167] #2 CommentContent() called at [D:\wwwroot\2031\wwwroot\includes\common.inc.php:518] #3 printpage() called at [D:\wwwroot\2031\wwwroot\comment\html\index.php:13]
Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in D:\wwwroot\2031\wwwroot\includes\db.inc.php on line 80
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发布于:2019-3-27 15:14:17  访问:227 次 回复: 篇
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Soldering Station Price
Nevertheless, in both construction kinds, the component leads are still electrically and mechanically fixed towards the PCB with molten metal solder.
With respect to the level of panels that need to be put together will regulate how the components will be soldered. When it is for the high manufacturing volume, then soldering elements to your Printed Circuit Board is best done by machine positioning. Machine placement is completed with bulk wave reflow or soldering ovens. Otherwise, in the event that production quantity is for little amount prototypes, soldering by hand works fine generally in most situations (Ball Grid Arrays are in reality impossible to solder by hand).
Often, through-hole and construction that is surface-mount to be performed in a single PCB assembly because some needed electronic components only obtainable in through-hole packages, while some are just available in surface-mount packages. Additionally, this is a justification to use both of this techniques through the same installation because through-hole mounting can actually offer more energy for the electronic components which are likely to undergo some stress that is physical. Then it can be more wise to use surface-mount techniques in order to take up less space on your board if you know that your PCB isn`t going to go through any physical stress.
After the components were completely constructed in the PCB, it is always better to test to make certain that the board functions correctly also to the performance required. Here are some of this methods that they are tested once they have now been assembled.
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1) A simple inspection that is visual be sure that there are no electric elements out of put on the circuit board. It is also a time that is good make sure every one of the soldering. (energy is off)
2) Analog Signature review: once you applie a AC that is current-limited sinewave two points of this electric components and circuit. (power is down)
3) Performing an In-Circuit Test: checking different measurements that are physical the board like voltage, frequency, etc. (power is on)
4) Performing a test that is functional verifying that the circuit board really does just what it really is intended for. (energy is on)
If some of the printed circuit boards fail some of the above tests, not all is lost. You can find out where in fact the issue is happening and replace the failing components and/or board to allow for this to pass through. This might be often named reworking.
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