Test Speed: Ramp and Step Curve Types

 

RAMP

The rate of pressure increase can influence the measured pore size. It takes time to empty pores, especially for thick samples and tortuous pores. Faster pressure ramp rates will lead to the pressure increasing before larger pores have emptied, creating the appearance of smaller pores. Excellent repeatability can be achieved by maintaining a constant ramp rate. For greater pore diameter accuracy, use a lower ramp rate.

STEP

The step mode allows flow to stabilize at each pressure before advancing to the next pressure. The test proceeds more slowly, but with greater pore size accuracy.

A higher resolution setting collects more points, but at the cost of longer measurement time.