Richard,
	By far, the easiest way to get good, reliable results is to instrument a board with thermocouples and record the temperatures of the assembly as it passes through the reflow system.  This way, you can know exactly what is happening when, and can make changes to the system settings if needed.  If you would like to know how to mount these thermocouples and how you might go about recording the temperatures, contact me off line.

John Guy
ACI / EMPF
714 N. Senate Ave.
Indianapolis, IN 46202-3112
voice:	(317) 655-EMPF ext.130
fax:	(317) 655-3699
e-mail: 	[log in to unmask]

-----Original Message-----
From:	[log in to unmask] [SMTP:[log in to unmask]]
Sent:	Monday, July 21, 1997 7:24 PM
To:	[log in to unmask]
Subject:	Reflow oven temperature

     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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