BeneVision N22/N19 Patient Monitor Operator’s Manual 27 - 7
27.7.4 Switching Off the Filter
The filter can filter EEG interference. It is switched on by default.
To disable the filter, follow this procedure:
1. Select the BIS numeric area or waveform area to enter the
BIS menu.
2. In the
BIS menu, select the Setup tab.
3. Switch off
Filter.
27.7.5 Setting the Displayed BIS Parameters
Besides the BIS value, you can also display up to four secondary parameters in the BIS numeric area. To select the
displayed parameters, follow this procedure:
1. Select the BIS numeric area or waveform area to enter the
BIS menu.
2. In the
BIS menu, select the Select Parameter tab.
3. From the
BIS Tile area, select a secondary parameter block, and then select a secondary parameter from the
Parameters area.
27.8 Sensor Check
27.8.1 Automatic Sensor Check
Once the BIS sensor is connected, an automatic sensor check starts to check the sensor type, status, and
impedance of all the electrodes, including the signal electrodes, the reference electrode and the ground
electrode. During the sensor check, the message “Sensor Check In Progress” displays in the information area. If
this message continuously displays, enter the sensor check menu and check if the impedance of each electrode is
acceptable.
After the initial sensor check, the monitor performs automatic check during BIS monitoring. Automatic sensor
check includes the following items:
■ The combined impedance of the signal electrodes plus the reference electrode. This is done automatically
and continuously and does not affect the EEG waveform. As long as the impedances are within the valid
range, there is no prompt message of this check or its results.
■ The impedance of the ground electrode. This is done every ten minutes and takes approximately four
seconds. It causes artifact in the EEG waveform, 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.
The monitor continually checks impedance levels during a procedure by generating a 128 Hz test signal.
Occasionally this signal may interfere with other equipment. If this becomes a problem, you may need to disable
the auto checking. Impedance levels will still be tested at startup, but once they pass, they will not be tested
again until a new case is begun.
To disable automatic sensor check, follow this procedure:
1. Select the BIS numeric area or waveform area to enter the
BIS menu.
2. In the
BIS menu, select the Setup tab.
3. Switch off
Auto Check
• Automatic sensor check may need to be disabled if the 1 nA 128 Hz impedance check signal
interferes with other equipment.
• Switching the auto 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.
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