Dry friction clutches are among the means used for application (moving off from rest without difficulty) and interruption of torque flow. 

In addition to the above-mentioned axial characteristic curves, torque characteristic curves are therefore also extremely important 

• zero crossing (average value of angle of rotation between loading and unloading) 
• pre-damper and main damper characteristic curve (angle or torque controlled)     
• partial curve (similar to pre-damper and main damper curve; here for determining friction coefficient) 
• drag torque (min. permissible torque after declutching). 

In addition to torque characteristic curves the following axial curves are determined: 

• characteristic curve of facing/cushioning springs (force/travel characteristic curve of spring between the clutch plates) 
• non-parallelism (measurement of non-parallelism at pre-load) 
• thickness of clutch plates (measurement of plate thickness at pre-load)

The test plant has the following features: 

• horizontal layout (component mounting alignment) 
• two-axis system with two independently controlled drive shafts. 

Force/torque measuring platform capable of measuring very low torques (from 1 Nm, e.g. drag torque, zero crossing) and very large moments (up to 1000Nm, e.g. main damper characteristic curve) with simultaneous measurement of axial force of up to 20kN.