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Peak temperature of Reflow

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#76136

Peak temperature of Reflow | 11 August, 2016

Dear All

I have a question for the reflow machine. I'm using Vitronics(Mr933+)reflow. The peak temperature of the (Chip, LED, SOT) component higher than (QFP,LGA) about 4 degree when i measured proflie. All of them on the same board . I don't know why is there a difference? Pls, help me to answer.

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#76138

Peak temperature of Reflow | 11 August, 2016

Different points on the board couple have different thermal masses.

Look here: http://www.ecd.com/portals/5/products/vmole/V-MOLE-Verify-3-Thermocouple.pdf

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#76139

Peak temperature of Reflow | 11 August, 2016

Dear Davef

Thanks for your information. I already have measured it at the same position for 2 kind of component but the result does not change.

Pls help me...

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#76140

Peak temperature of Reflow | 12 August, 2016

In short physics. A large Black object will absorb more energy than a smaller non-black object. Thus the temperature will remain lower around the black object as it heats up !

sarason

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#76141

Peak temperature of Reflow | 12 August, 2016

In general, smaller objects heat up faster than larger objects because they are lower mass. For example if you heat up one liter of water in pan and two liters of water in another pan with the same heat energy applied, the smaller mass will heat up faster. Same way with your reflow oven.

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