Electronics Forum | Mon Nov 07 20:27:33 EST 2005 | davef
* Singulation (Wand 708.459.2400fax2421, Circuit Technology 708.705.2140fax2141 John Bambule, Pioneer - Dietecs (508)-643-2297 Fax: 2295 Gerry Larson) * Routing (Cencorp 303.530.0891 bill stranathan 303.772.5933x227, 0Z0 Automation 800.366.0401 Chip
Electronics Forum | Tue Jun 20 22:52:46 EDT 2000 | gary
How to calculate the delta T ? What's the allowable range for delta T value? we r not calculating this in our process, instead we r maintaining the pre-heat temp which we measure from topside of the bd. Thanks in advance
Electronics Forum | Wed Jun 21 03:58:46 EDT 2000 | Wolfgang Busko
Hi Dave, how does that calculate when you consider a topside temperature of for example 120�C like mentioned for NC-flux a while ago and a pot temperature of 250�C ? Just wondering Wolfgang
Electronics Forum | Wed Jun 21 20:29:34 EDT 2000 | Dave F
Wolfgang: You're correct, I've obviously goofed this up, somehow!!! (sound of scurrying in yellowed soldering notes) Let me try and find the source for this to redeem myself.
Electronics Forum | Wed Jun 21 23:47:28 EDT 2000 | gary
my topside preheat is 97 deg. C and my peak temp. is 230 deg. C with a duration of 4 secs. What would be my Delta ? I suppose 230 minus 97 is equal to 133 deg C...is that right? regards
Electronics Forum | Sun Jun 25 22:58:49 EDT 2000 | gary
thanks for the feedback....but what's your delta T and how will you know that you are within the delta T range ?...I think this is the main point of the above topic...can you elaborate more on how did your company get Delta T ? thanks and regards,
Electronics Forum | Mon Jun 26 14:36:44 EDT 2000 | Tekguy2000
Then if you have R-Paks on the solder-side start all over again!!