透气性测试方法可分为压差法（Differential-pressure method）与等压法（Equal-pressure method）。广泛使用的是压差法，可分为真空压差法和正压差法（体积法）。
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differential pressure method 压差法
static differential pressure method 静压差法
differential-pressure measuring method 差压测量法
differential pressure concentration method 差压浓度法
pressure differential method 压差法
differential air pressure casting method 差压铸造法
differential maximum bubble pressure method 差分最大气泡压力法
Pressure-differential method for sleeve-to-tube joining 发明名称
Third, the piezoelectric method is sensitive to pipe vibration, whereas the differential-pressure method is hardly affected by this kind of disturbance to some extent.
压电式对于管道振动十分敏感，而在一定范围内差压式的输出信号几乎不受管道振动干扰的影响。
The precision of liquid column manometer was described. The correct use method and error correction of U tube manometer and double tube differential pressure gauge were analysed.
叙述了液柱式压力计的精度，对U形管压力计和双管差压计的正确使用方法及误差修正做了简要分析。
The zero and linearity characteristic of differential pressure transducer is corrected with method of water column correction to ensure higher precision differential pressure data.
采用水柱校正法对差压传感器的零点及线性特性进行校正以保证高精度的差压数据。
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