Eclipse Additional Information Page 13
2.4.1 Check the amplitudes of the EEG with LBK15
Double click on the EEG to get picture below.
Use and move the horizontal curtains in the EEG box to read the peak to peak amplitude of the EEG. Typi-
cally an amplitude of 2uV peak to peak is expected for electrical quit surroundings.
You can also troubleshoot which part makes noise while monitoring the EEG while moving the potential
noisy parts.
1. Select Threshold Click (included to all licenses) or the protocol you want to check out.
2. The Threshold Click uses a filtering of 1500-33Hz.
3. Uncheck the residual noise stop criteria to let the test run for a longer time (the Threshold Click protocol
will stop the test when the residual noise is down to 40nV which often is after 800 sweeps in this test).
4. Select intensity, if using higher intensities > 80dB nHL take account for EMI from transducers.
5. Start the recording and analyze the results obtained.
Typically a residual noise of 16nV is expected after 4000 sweeps for electrical quit surroundings.
Note The LBK15 is an electrical circuit and will not mimic a patient 100% as human tissue interacts differ-
ently to electrical noise compared to a passive electrical circuit with 4 resistors (LBK15).
The LBK15 testing noise levels can be used as a good guideline for troubleshooting but indeed also for prac-
ticing the test protocols before a test subject is connected.
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