Mindray BeneView T8, Operation Manual

Page: 159 / 290

Monitoring BIS
16-5
16.5 Continuous Impedance Check
By default, this check is switched on. It checks:
„ The combined impedance of the signal electrodes plus the reference electrode. This is
done continuously and does not affect the EEG wave. As long as the impedances are
within the valid range, no prompt message about this check is given.
„ 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
[
BIS Ground Checking
] is displayed 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 continuous impedance check interferes with other measurements, it can be switched off.
To do this:
1. Select the BIS parameter window to enter the [
BIS Setup]
menu.
2. Select [
Cont. Imped.Check
] and then select [
Off
].
CAUTION
z
Switching off the continuous impedance check off will disable automatic prompt to
the user of impedance value changes, which may lead to incorrect BIS values.
Therefore, this should only be done if the check interferes with or disturbs other
measurements.