We only use the ground signal in our t-Interface 20. If your amplifier uses a reference signal, then it is necessary to connect a reference disc electrode to the subject and the amplifier. If your amplifier does not use a reference signal, then you only need to apply a disc electrode to the subject and connect to the ground input on your amplifier. In either case, you also need to connect the t-Interface 20 ground (Green wire) to the ground input of your amplifier. Prepare and place the disc electrodes as you normally would, and connect them to your amplifier as you normally would. If you do not have two connected isolated ground ports on your amplifier, you will need to use a jumper to connect both the ground conventional disc electrode and the Green wire of the t-Interface 20 output cable to ground on your amplifier. We do not include conventional disc electrodes with our system.
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