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It's been years since I wrestled with wave solders. This is bringing back some bad memories. <g>
The only thing I wanted to point out about the original data sheet was that there was no mention of solder level. I used to see biggest variation in pot temperature as a function of the solder level - especially when the level dropped and new bars are added.
So you may want to take note as to when the data is collected versus when solder is added. Has the temperature of the solder bath had a chance to normalize? It's pure speculation on my part, but that could be a possible cause of the bi-modal data.
The only thing I wanted to point out about the original data sheet was that there was no mention of solder level. I used to see biggest variation in pot temperature as a function of the solder level - especially when the level dropped and new bars are added.
So you may want to take note as to when the data is collected versus when solder is added. Has the temperature of the solder bath had a chance to normalize? It's pure speculation on my part, but that could be a possible cause of the bi-modal data.