Dynamic Probing Super Heavy (DPSH) using 63.5kg hammer mounted to a Terrier 2000 drive sampling rig. This is used to drive probing rods into the ground, where blows are counted in 100mm increments and plotted graphically against depth. No information on the characteristics of the soils is obtained during this form of investigation as it is not possible to recover samples for inspection. Therefore the test is effectively blind and should not be considered for use in isolation as an exploration method.

The test method is principally used to profile the depth of unconsolidated deposits, where depths of up to 20m can be achieved in favourable conditions. It is normally used to infill gaps in the site investigation data between exploratory holes.