| 摘要 |
A device for the electropneumatical testing of the air permeability wherein each cigarette is subjected to at least one test consisting of applying pneumatic pressure to one end of the cigarette and determining the resistance or the pressure drop at the input to the cigarette. The measured pneumatic pressure is transformed into electric measurement signals which are compared with electric reference or threshold signals. According to the invention, the electric measurement signals are compared with the electric reference signals which are shaped as saw-tooth signals and are generated in synchronism with the cigarette tests, that is with the measurement signals. The ascending portions of the saw-tooth reference signals have a rate of increasing magnitude which corresponds approximately to the rate of increase of the electric measurement signals.
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