Format : | Purified |
Amount : | 100 µg |
Isotype : | Mouse IgG2b |
Purification : | Affinity Chromatography |
Content : | 0.2 mg/ml in Tris buffer containing 0.05% Azide |
Storage condition : | Store mouse Isotype control at 4°C, stable for 6 months. |
A mouse isotype control is an antibody of the same class (isotype) of immunoglobulin as the specific mouse antibody, but is either myeloma-derived antibody of unknown specificity, or is raised against an antigen that is presumed not to be present on or in the cells under study. Isotype control antibodies are used for the estimation of non-specific binding of target primary antibodies to cell surface antigens.
FACS: 0.25-2 µg/10^6 cells
For Research Use Only. Not for use in diagnostic/therapeutics procedures.
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取下CPU时发现主板掉焊点、塑料排线座损坏,甚至在吹焊CPU时出现短路,更换新CPU或其它BGA封装IC也不能正常工作,其原因是维修人员不了解热风枪的特性所致。
现以850热风枪为例说明如下。
在吹塑料外壳功放时,最好把热风枪的温度调到5.5格,热风枪的风量刻度调到6.5~7格,实际温度是270~280℃,风枪嘴离功放的高度为8cm左右。吹功放的四边(因为金属导热快,锡很快就熔化)热量会很快进入功放的底部,这样就可将功放完好无损地取下。 焊入新功放时应先用风枪给主板加热,加热到主板下面的锡熔化时再放入功放,吹功放的四边即可。
吹CPU时应把热风枪的枪嘴去掉,热风枪的温度调到6格,风量刻度调到7~8格,实际温度是280~290℃,热风枪嘴离CPU的高度为8cm左右。然后用热风枪斜着吹CPU四边,尽量把热风吹进CPU下面,这样即可完好无损地取下CPU。
取下或焊上塑料排线座,注意掌握热风枪的温度和风量即可。 吹焊CPU时常会出现短路,更换新CPU或其它BGA封装IC时有时也会出现短路现象。笔者的经验是在吹焊CPU或其它BGA封装IC时,应对主板BGA IC位置主板下方清洗干净再涂上助焊剂,IC也同样清洗干净,还要注意IC在主板的位置一定要准确,使用热风枪风量要小,温度应为270~280℃。在吹焊IC时还应注意锡球的大小。锡球太大,吹焊时应使IC活动范围小些,这样IC下面的锡球就不容易粘到一起造成短路;若锡球较小,活动范围可大些。
接主板断线或掉点时,可以使用绿油、耐热胶、101、502胶等固定。用胶固定是一个好办法,无论断多少线和掉多少点,即使飞线,也可一次完成。
此外还应注意,主板上不要涂助焊剂,而应在CPU上涂助焊剂。开始接线时要用吸锡线把主板CPU处多余的锡吸净再接线,这样就不会出现凹凸不平的现象,定位更容易。定好位后,焊接时不要用任何工具固定CPU,CPU下面的锡熔化后若有微小的移动,如果能看出来就说明失败,如果在焊接时看不出CPU移动,那就表示成功了。
顺便说一下水浴锅内注多少水为为适宜,常规水浴锅注水应在整个内胆三分之二为适中,如水太少了,温度反冲偏大,会影响整机精度。太多了会溢出体外。说具体一点,水浴锅注水多少,这要在放入量杯,水不溢出体外即可。
参考资料:Hi.baidu/=。www.jingda17.net。DI
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