XLTEK EEG32U Amplifier User and Service Manual
34
Impedance Check
An Impedance Check is performed to ensure that the electrode contact with the patient is satisfactory. You can perform an
impedance check at any time during a study. The impedance check will exhibit high accuracy only if at least six patient leads
plus Common electrode are connected.
To Activate an Impedance Check
Do one of the following:
• On the keyboard, press the minus (-) key on the number pad.
• Choose Controls > Impedance Check.
• Press the Impedance button on the amplifier, hold it for at least 2 seconds and then release
Running an Impedance Check
When an impedance check is initiated, the software scans all channels (in auto scan mode). You can monitor the contact of a
single channel by locking onto it and then adjusting the electrode contact to acceptable impedance levels. LEDs on the EEG32U
amplifier show red light for a channel that failed impedance check and green for channels that passed it.
To… Do this…
Start the impedance check Choose Controls > Impedance Check
Lock onto a channel Click Lock Channel. Then, adjust the electrode connection until satisfactory
levels are achieved
Proceed to a full impedance check Click Release Lock
End the impedance check Click End
Save the impedance check as part of the
study
Click End and Start Recording
Interpreting an Impedance Check
An impedance check displays bar graphs that show the impedance of each electrode connection. A green bar indicates the
reading is below the threshold. A red bar indicates the reading is above the threshold. To set the impedance threshold, click
one of the Threshold buttons in the Threshold Group box on the right side of the Check Impedance screen. To read a numerical
value for the impedance in kOhms, double click on the amplifier picture on the screen after closing Impedance Check. This
brings up a table that lists the impedances for all channels that were checked.
NOTE: If the impedance check is run with a Protocol, the threshold is determined in the Action settings in the Protocol tab of
the Edit > Settings box. Otherwise, the threshold is determined by manually clicking the option buttons in the Threshold section
of Impedance Check dialog box.
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