The TF10-POT fixture integrates with the parametric relay test system ArtWorks software environment to provide the operator with a manual adjustment control. This control can be programmed to adjust either the DUT coil voltage or current before or during a test sequence whilst the relay contact pattern is being displayed to the user on the screen. Typically this can be useful when the operator needs to make manual contact force or pull-in drop out adjustments during the assembly stage of the relay.