MTS Model 286-31 Transient Permeability Pore Pressure Intensifier - Manual (Page 75)

Running a Transient Permeability Flow Test
286.31 Transient Permeability Pore Pressure Intensifier Operation 75
11. If needed, fine-tune the pressure differential between Reference Volume 1
and Reference Volume 2.
Adjust the Transducer Input 1, Transducer Input 2, and Permeability
Output valves. Do not close them, but turn them enough to change their
valve positions.
This can be done now and when you are running the test.
12. If the rest of your system is ready, start your data acquisition procedure.