40 Easy Oven Setup REFLOW TRACKER
Generating Recipe Predictions
After setting up the process limits (see above), click or select Easy Oven
Setup > Recipe Predict to carry out a recipe prediction. By using data from your
solder-paste specification, Insight will create recipes which are predicted to
produce temperature profiles to match the solder’s preferred usage conditions.
When a prediction has been performed, the results are displayed in the main
Graph and Analysis Windows where further trials and analysis can be carried
out.
Only one prediction can be open at a time. If you already have a prediction
open, you must close it before you can start a new prediction.
In order to ensure successful predictions, unheated oven zones must
be specified.
On starting a prediction, the Select Process Limits dialog opens:
1. Highlight in the list the process limits file appropriate to your recipe
prediction. The process limits files shown for selection are those contained
in the default directory, but you can also click Browse to locate files which
you may have stored elsewhere. On the right of the dialog is shown a
summary of the parameters contained in the selected process limits file,
with a picture indicating whether the limits are for a simple tent profile or
for a ramp/soak/spike profile.
2. Click OK in the dialog. The recipe prediction is then carried out.
Refining the Predictions
The predicted recipes are then listed in the Analysis Window in order of
rank (shown by a star rating) according to the closeness of their expected
result to the specified process limits; in calculating the recipes, the parameters
in the limits that are given the highest importance are peak temperature and
time above liquidus. Next to each recipe’s rating is also shown its line speed
and the average of its oven-zone temperature settings.
To list predicted recipes in an alternative order – by descending order of line
speed, or of average temperature – click on the relevant column header. Click
the header a second time to reverse the order.
Highlighting a recipe in the list displays the following for it:
• The predicted profile that the recipe is expected to produce. Marked on
the graph are the permitted ranges for peak temperature and time
above liquidus as specified in the process limits used. In addition, a tangent
on the profile indicates the point of maximum slope for any probe; the
number of the probe with this maximum slope is shown on a label adjacent.
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