Fluke Datapaq Reflow Tracker User Manual page 42

Troubleshooting the Predictions
Poor predictions can be due to problems or errors in any of the components of
a prediction. Care must always be taken when entering data or performing runs.
Common reasons for bad predictions are as follows.
• Invalid zone length measurements – The oven's actual zone lengths
and those entered into the oven file are different.
• Setting up active/passive zones improperly – Check that you have
correctly defined oven zones as either active (heated) or passive (unheated).
• Entering wrong recipe settings into the oven – The oven recipe
settings (oven-temperature set points) and the actual set points on the oven
during the profile run are different.
• Entering wrong line speed for the oven – The actual time spent in
each oven zone will be different from that calculated.
• Not allowing the oven to warm up or settle sufficiently – This will
result in actual temperatures that are different from the set temperatures or
greater fluctuation in temperature while the oven settles.
• Noisy oven – Some ovens are inherently unstable or have large
temperature differences across the belt width. Use Statistical Process
Control (p. 27) or Surveyor (p. 43) to monitor your oven's
performance.
• Inconsistent attachment of thermocouples to the PCB – The
temperature as measured by the thermocouple is very dependent on the
method used to attach it to the PCB.
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Easy Oven Setup
REFLOW TR ACK ER