The Signal Quality Control - Maico MB 11 Classic Operation Manual

Operation Manual MB 11 Classic

6.4.2 The signal quality control

Figure 17
MB 11 - program test screen showing bad and good signal quality
The signal quality is determined by the ratio of artifacts versus accepted
samples of EEG data. Artifacts are large potentials that are rejected during
the recording. They can be caused by electrical noise in the environment,
muscle activity related to movement of the baby, muscle tension or loss of
acceptable electrode impedance. Excessive periods of artifact can prolong
the test time and may increase the chance of a "Refer" result.
After the impedance test is completed and data collection begins, the signal
quality light is displayed at the top of the test screen. Red indicates poor
recording quality (artifact), yellow indicates fair quality and green indicates
good signal quality. When the signal quality meets conditions to display a
yellow or green bar, the test proceeds. When the signal quality is poor (red
light) then artifacts are occurring which, in effect, pauses data collection.
The signal quality indicator light on the MB 11 Classic amplifier box also
shows a color indicator of signal quality that matches the display on the
screen.
If the signal quality remains poor for a prolonged period, check the contact
of the electrodes to the skin. If poor signal quality is caused by movements
from the baby and muscle artifact, the test will continue automatically as
soon as the baby is calm and the signal quality is good again. If necessary
due to excessive agitation of the baby, consider manually pausing the data
collection by pressing the "PAUSE" button and allow the baby to calm down
before continuing the screening.
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