A blinking LED display bar or beeps while in impedance meter mode indicate that your electrodes produce high galvanic voltages. The Impedance Meter will warn you if your electrode galvanic voltages are too high.

To solve this problem:

1. Check your electrode connections. Be sure to use only silver or gold per each channel.
2. Do not mix electrode types on the same channel.

If you did not mix up different electrodes within one channel and still get the warning, replace the electrodes. Worn-out or damaged electrodes tend to produce high voltages that are very noisy. That noise looks like an EEG and cannot be distinguished from the real EEG.

Important Note:
Electordes behave like little batteries. They produce a so-called galvanic voltage that depends on the electrode material, skin properties and the conductive gel used. It is important that the galvanic voltages at one channel are almost the same, i.e. the voltage difference is near zero. For that, use only electrodes of the same type per channel. Never mix e.g. silver and gold electrodes at one channel.

Examples for proper usage of various electrode types:

• All Gold electrodes
• All silver electrodes
• Channel 1 gold, channel 2 silver. The ground clip may be any gold or silver

Examples for bad electrode connection:

• Channel 1 plus=gold electrode, channel 1 minus=silver electrode