User Manual

3. EEG/PSG MEASUREMENT
Operator's Manual WEE-1000 3.13
Attaching the Electrode
You must follow these guidelines to obtain correct EEG recordings.
Required Electrodes
Do not perform EEG measurement without the Z, C3, C4, A1 and A2 electrodes.
Input Jack Z
Connect the lead from the electrode (Z electrode) attached on the patient’s nasion to input jack Z
on the electrode junction box. This input jack is used to eliminate AC interference.
The input jack Z is also used for checking electrode impedance.
Input Jacks C3 and C4
The C3 and C4 electrodes are the system reference electrodes for EEG measurement. Input jacks
C3 and C4 must be used for EEG measurement even if C3 and C4 are not programmed in any
montage.
Connect the leads from the electrodes on positions C3 and C4 to input jacks C3 and C4,
respectively.
Input Jacks A1 and A2
The A1 and A2 electrodes are the reference electrodes for skin-electrode impedance check. Input
jacks A1 and A2 in addition to Z, C3 and C4 must be used for the electrode impedance check.
When checking electrode impedance, connect the leads from the electrodes on positions A1 and
A2 to input jacks A1 and A2, respectively.
Checking Original Electrode Potentials for All Active Electrodes
Check the original electrode potential for all active electrodes by programming a montage with the
system reference (Select the 0 V button for reference electrode on the Montage dialog box). Refer
to “Programming Patterns” in Section 4 of the electroencephalograph operator’s manual..
The digital EEG displays the EEG waveform in each channel by subtracting two electrode
potentials selected to a montage. The subtracted result will be incorrect, if the electrode attachment
is not correct, the original electrode potential is flat, or unstable or artifact is superimposed on the
original electrode potential. Omit the measurement result if the displayed EEG waveform is
incorrect.
WARNING
• Do not connect the Z electrode lead plug on the electrode junction box to a
ground or equipotential ground. Otherwise, leakage current from another
instrument cause electrical shock to the patient.
• Only connect a BF type instrument to the DC connector on the telemetry unit.
Otherwise, leakage current from the other instrument causes electrical shock to
the patient.