Why worry about the temperature if the top of the chip is 20 degrees C above eutectic - 183 C(at the balls)...if a machine works at convection oven temperatures, with high power, then there's no need to worry...Also, a CSP is a very forgiving chip.
APE (www.apecorp.com) manufactures their machines to work at convection oven temperatures....we use a high power heater...this makes it easy to lower the temperature on the unit.
High power also shortens the time it takes to remove or replace the chip. When you buy a machine look at the power of the heater! Is it 500 watts or 1200 watts.
I think of it in terms of heating a room with space heaters. The higher the wattage, the lower you can set the temperature of the heaters. If you want to leave the temperature the same (when comparing a 500 watt heater to a 1200 watt heater) then the air in the room will reach the comfort level much quicker.
Dave
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