Electronics Forum | Tue Jun 21 14:35:11 EDT 2005 | lind
does anyone know how to read SMT zener color code? I need to figure one out that is blue, green, and violet.
Electronics Forum | Mon Jul 16 15:47:52 EDT 2012 | davef
Here's what Desco says ... Humidity Indicator Card (HIC) A card on which a moisture-sensitive chemical is printed such that it will change color from blue to pink when the indicated relative humidity is exceeded. This is packed inside the moisture-se
Electronics Forum | Mon Jul 16 07:33:34 EDT 2012 | amitsindwani
Why to use 5% color spot in HIC if level 2a-5a are considered bad when 10% is NOT blue ? 10% will be NOT blue(or pink) only after 5% is pink. Then why to keep 5% in HIC ?
Electronics Forum | Mon Jul 16 16:37:29 EDT 2012 | kjs123p
Why to use 5% color spot in HIC if level 2a-5a > are considered bad when 10% is NOT blue ? 10% > will be NOT blue(or pink) only after 5% is pink. > Then why to keep 5% in HIC ? We change out the HIC and dessicant when the 5% turns pink to try to
Electronics Forum | Tue May 03 21:14:19 EDT 2011 | davef
Can we talk some to better understand the scope and breadth of the problem? * From your picture, it looks as if the problem shows-up on some pads, but not others. Is this accurate? * Is this lot related? * Is this related to a few items from a lot? *
Electronics Forum | Thu Mar 10 13:05:41 EST 2005 | patrickbruneel
This phenomenon is caused by a high amount of halogens (Cl, Br etc.) used in the flux activators or in the flux surfactants. We've seen effects creating all colors of the rainbow. Changing to No-Clean (halide-free) will eliminate this color effect.
Electronics Forum | Thu Mar 10 14:31:57 EST 2005 | russ
Patrick told you why, But here is some more info for ya, I would absolutely not recommend that wires be tinned with OA. The residue will never get cleaned underneath the insulation and all of your strands will strt to break in the near/far future.
Electronics Forum | Thu May 05 01:21:42 EDT 2011 | city4497s
Hi Davef The problem shows up on * random location including component pads * all PCB and different PCB supplier * different solder paste lot * both printing and dispensing process * all production shift * we have only 1 production line It black,
Electronics Forum | Thu Mar 10 10:06:08 EST 2005 | steve
OK all you Gurus here's one for ya. Customer is tinning wires with standard eutectic solder in a solder pot. There is a blue tint to the solder in the pot. After tinning with OA flux, which I will change to NC shortly, he has clear teflon insulation
Electronics Forum | Thu Mar 10 15:43:06 EST 2005 | steve
Thank you both for your assistance. I knew that I could count on you folks. The customer has purchased No-Clean flux and is using it as we speak. Hows that for customer service.... All in a days work... Thanks again You make me look good!!! Steve
