| 摘要 |
A whole-body plethysmograph having a calibration of the pressure gauge is provided, which includes an air tight, lockable cubicle for the reception of a person to be examined, a cubicle-pressure pressure gauge that responds to the interior pressure of the cubicle. A mouthpiece is provided with a valve, by means of which the respiratory air flow can be barred, and a closure-pressure pressure gauge is connected to the mouthpiece for measuring the pressure in the mouth of a person, as well as an evaluation unit connected to both the cubicle-pressure pressure gauge and the closure-pressure pressure gauge. A piston pump is connected to said cubicle, so as to be air tight. The piston pump is surrounded by the air tight box, to which the closure-pressure pressure gauge is, at times, connected for calibration and the pressure fluctuations generated by the piston pump are used to calibrate the cubicle-pressure pressure gauge and the closure-pressure pressure gauge.
|
