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Solder paste thickness measurement with laser machine

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SIR

#39917

Solder paste thickness measurement with laser machine | 23 February, 2006

We have an AUREL CS1222 machine to measure the thickness of the solder paste deposited on a bare board by a stencil printer. This device has a laser beam that has to be put on the pad where you want to measure the solder paste thickness. The measure is done manually measuring the step between the piece of laser beam on the solder paste and piece of laser beam on the nearest solder resit (on the board). The problem is that you'll never have uniform deposition of solder resist on the board, and also the finish on the pads of the board will vary, the result is that you have too much variation in the measure. Someone uses this method and has some advice?

Thanks

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#39938

Solder paste thickness measurement with laser machine | 23 February, 2006

I have dealt with it before and usually it's consistent, so you use some simple math to work around the issues.

Now, if you have so much variability between different locations on your board for resist thickness, HASL thickness, etc., that it fouls up your paste thickness measurement consistency, maybe you have other problems?

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