I'm curious as to what kind of use this data is put to after its obtained.  Are there 'rules of 
thumb' which allow you to troubleshoot the oven settings based on raw data (i.e. I'm 
familiar with the < 3oC/sec temperature ramp rule for reflow ovens), or does it need to 
be processed in some manner (FEA analysis for example) before it can be used to fine 
tune the process?
Cheers,
		Andy


----------
From:  Frank Hinojos[SMTP:[log in to unmask]]
Sent:  Monday, July 21, 1997 2:03 PM
To:  [log in to unmask]; [log in to unmask]
Subject:  Re: Reflow oven temperature

     Richard,
     
     It is true that reflow parameters are important not only for the 
     soldering process but also for components!  We have used the Datapaq 
     Reflow Tracker with great success.  It is what is often termed a 
     "temperature mole".  The tracker rides in the furnace with the part 
     and has thermocouple probes which take measurements.  Trackers can 
     transmit data to a computer which yields real time analysis of the 
     part, i.e., temps, ramps, max peak, etc.
     
     Frank Hinojos
     Watkins-Johnson Co.


______________________________ Reply Separator _________________________________
Subject: Reflow oven temperature
Author:  [log in to unmask] at INTERNET
Date:    7/21/97 4:24 PM


     I am more familiar with test than board manufacture and would welcome 
     an answer to a simple question.  The quality of the connection depends 
     on a number of characteristics of a reflow oven - pre-heat, 
     temperature and time in the oven. CORRECT?
     
     If so, is there something I can attach to boards as they go through 
     the system to ensure that the settings are correct for the particular 
     boards?  I am thinking of a substance that changes characteristics, 
     say colour, at a rate depending on the temperature.  We manufacture 
     small quantities but large variety and thus the settings are 
     potentially needing changing regularly.
     
     I want to eliminate faults before I have to test.  I would normally 
     ask the in-house expert but he is taking a well earned rest.
     
     Thanks in advance.
     
     Richard Philp,
     
     Test Technologist
     
     Matra BAe Dynamics
     
     


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