A Stacking Jumper Lead/Electrode can be used to short together two of the electrode input jacks. It is important to remember that for proper operation of most amplifiers, all of the input jacks must have something connected to them.
 
To use a two-channel EEG amplifier for single-channel EEG recording, insert electrodes into the electrode input jacks for Signal A and Reference A. Once these are connected, use the Stacking Jumper Lead/Electrode to short together the unused electrode jacks of Channel B. By inserting one end of the Stacking Jumper Lead/Electrode into Signal B and the other end into Reference B, we will cause Channel B to flatline instead of receiving high amplitude noise artifact.
 
To use the device for two-channel EEG recording with linked ear references, insert the two active electrodes into the electrode jacks for Signal A and Signal B. Once these are connected, insert the Stacking Jumper Lead/Electrode into the electrode jacks for Reference A and Reference B. You may then insert two electrodes into the jacks of the Stacking Jumper Lead/Electrode to link the references together. Alternatively, you may only insert one electrode in the jacks of the Stacking Jumper Lead/Electrode. This will send the reading from the electrode to both Reference ports, rather than just one port. 
 
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