[TriEmbed] need stupid pet trick immediately
pete at soper.us
Wed Oct 15 15:56:51 CDT 2014
Thanks very much to all!
As of now I'm getting stupendously better performance from the T-962
oven than what I was moaning about Monday night. Cutting out air leaks,
propping the boards up with a air gap over the drawer metal, and making
a custom profile that lies and compensates for the profoundly messed up
reckoning of time of the oven have combined to make me pretty happy
about the future with this ($#Q!!$$@$$@!), uh, inexpensive Chinese
Here are the readings from three thermocouples on three corners of the
the synchronous counter board I'm preparing to solder. This has 10
74HC192 and three 74HC373 chips plus 13 bypass caps. (TSSOP chips and
0603 caps). The soak-time ramp rate is very fast compared to the
(straight line Kester recommended) profile, so I need to do some more
tweaking, but it isn't clear how much difference this will really make.
The peak temperature is a bit high, but there's some margin to play with
there wrt what the components can stand (I'm using plain solder and
they're all designed for lead-free these days). Degrees C on Y, elapsed
seconds on X.
But to give you an idea of where things were earlier, here are
measurements with the same thermocouples (plus one that obviously popped
loose) while a little breakout board was being soldered. The orange dots
show the timing and temperatures that Kester recommends for the solder
paste I'm using. The oven was super-slow warming the boards up and held
high heat (or feeble, too-low heat) for very long periods, then cooled
the boards way way too slow. Other than that the performance was
And yet the tiny board in the middle of the drawer soldered well
enough that it works.
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