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Ed308,
The granite has a lot of inertia. To kill the vibration set it on a piece of carpet scrap or make it a wood base and buy commercial vibration mounts for it.
The Acculab scale I got lacked a Faraday sheild, so I lined the bottom of the bench with foil and grounded it. To keep line noise out of the equation, I connect it through a line filter and an old surplus Sola resonant voltage regulating transformer, but I just had all that in my junk collection. You don't need it, but if you have an old computer UPS with a dead battery, putting that in line with the scale will give you both filtering and surge protection.
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