| 摘要 |
<p>The paper sample (4) is held in a two chamber measuring head (1) and air is withdrawn from one side (2) by a pump (14). The air flow is measured by pressure difference (9,10) and regulated by a valve (11) to produce a computer nominated chamber pressure(CP). The air flow signal is applied to a computer (PC) through a range of variably calibrated amplifiers (An), a multiplexor (MUX) and digital to analogue convertor (CA/N)</p> |
