Impedance Test - Maico MB 11 Classic Operation Manual

Operation Manual MB 11 Classic

6.4.1 Impedance Test

Figure 16
Impedance traffic lights at top of measurement window
The impedance is the resistance between the measuring electrodes (Vertex
and Nape (or Mastoid) and the ground electrode. This impedance is
influenced by the resistance of the electrodes and the resistance of the skin.
The impedance should be in the range of 250 Ohm to 15.000 Ohm for each
electrode reading. Impedance in this range will allow the best EEG quality.
The top of the test screen shows the impedance traffic light (Figure 16). Here
the tester can see easily the status of the impedance test for each of the
three electrodes. The green color symbolizes good impedance, yellow means
not optimal and red signals poor impedance.
The impedance values measured for Vertex / Ground and Mastoid (or Nape)/
Ground lines are shown in the status line in the lower left corner at the
screen.
In case of red light the impedance needs to be corrected. Check the
connection of the electrode to this site, and, if necessary use additional skin
preparation material to clean the site better.
In some cases it takes a few seconds until the electrode gel takes effect.
The impedance test is passed when all three electrodes show green or yellow
for approximately 7 seconds. After passing the impedance test the
measurement starts automatically and the impedance traffic light changes
into the signal quality traffic light.
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