BIS Dialog Bispectral Index (BIS) (Optional)
19 - 10 V Series Operating Instructions
19.2.8 Auto Impedance Check
Factory default setting for the Impedance Check is On. It checks:
• The combined impedance of the signal electrodes plus the reference electrode. This is done
automatically and continuously and does not affect the EEG wave. As long as the impedances are
within the valid range, there is no prompt message of this check or its results. If the impedances
are not within the valid range, the message Check Sensor displays on the digital tile.
• The impedance of the ground electrode. This is done every ten minutes and takes approximately
four seconds. It causes an artifact in the EEG wave, and the message Ground Check In Progress
displays on the monitor during the check. If the ground electrode does not pass this check,
another check is initiated. This continues until the ground electrode passes the check.
If the auto impedance check interferes with other measurements, it can be switched off.
1. Select the BIS digital tile.
2. Select the Setup tab.
3. Select the Impedance Check button.
4. Select Off.
CAUTION: Configuring the Impedance Check to Off disables automatic prompts to
the user of impedance value changes. Doing this may lead to incorrect
BIS values.
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