The Keithley Instruments Model 6517B-ILC-3 Interlock Cable is designed to connect the interlock of the Model 6517B Electrometer with the Model 8009 High Resistivity Test Fixture. All of the electrode constants are preprogrammed into the Model 6517B when the Model 8009 test fixture is selected from the Model 6517B front panel or over the IEEE bus. To use the Model 6517B-ILC-3, plug one end of the cable into the INTERLOCK connector on the rear panel of the Model 6517B and connect the other end of the cable into the INTERLOCK connector of the Model 8009 test fixture.