ABSTRACT
In order to measure the system compressibility and correct for it during the data reduction process, the probe is inserted in the calibration steel tube. The pressure is increased in steps to 500 kPa, 1500 kPa, 2500 kPa. A zero volume of the probe must be defined so that all tests start with the probe having the same deflated volume. This can be done as follows. At the end of the check for saturation and leaks, the probe is in the calibration steel tube under 2500 kPa of pressure. A zero volume of the probe must be defined so that all tests start with the probe having the same deflated volume. Once the probe is at the zero volume, the volume reading scale is brought to zero by adding or wasting the necessary amount of water.
