General Electric (blast) oven are equipped with temperature uniformity parameters: natural convection type oven for working temperature limit by 3%, drying box forced convection as working temperature limit by 2.5%. But the electric vacuum drying oven temperature uniformity parameter is not set, this is why?
Vacuum oven gas molecular motion to rely on room temperature reached uniform has almost no possibility.
Therefore, from the concept of we can't have usually electric (blast) stipulated by the oven temperature uniformity of the definition of the vacuum oven up.
In the vacuum state under the specific requirements is of no significance. The amount of heat radiation and inversely proportional to the square of the distance. The same object, the heat radiation of the heating surface distance accept 20cm premises only distance 10cm heating surface at the 1/4. The difference is quite large. When this phenomenon and the winter sun, sun to the side of the sun is warm, not to bask in the sun side cooler is a reason. Because the vacuum oven is very difficult to make the point in the structure of heat radiation in the studio space uniform, also lack of assessment method of authority, this may be an important reason of electrothermal vacuum drying oven standard is not provided with the temperature uniformity parameters.