Noraxon offers two types of pre-amplified lead wires to be used with MyoSystem1400 and TeleMyo2400. The two-snap pre-eamplified lead wire (part #242) attaches to the two EMG surface electrodes at the muscle site. The three-snap pre-amplified lead wire (part #243) provides an additional electrode contact. This third snap serves as a ground reference for the whole measurement system. Typically, only one three-snap pre-amplified lead wire is required in a measurement system and all other channels can use two-snap pre-amplified lead wires. The three-snap pre-amplified lead wire supplies an "active cancellation" signal to the reference electrode. The signal is a "negative" version of the common mode signal present in the two differential input snaps. This cancellation method serves to reduce any common mode signal present on the subject and improves the system's overall noise performance.

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