PHYWE Cobra4 - ECG; EMG; EOG

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Procedure using the software measure
Select the desired type of measurement, ECG, EOG or EMG
in Cobra4 measure as follows: Double click on “voltage ”
under the “Electrophysiology” entry in the navigation window.
The “Channel voltage ” window now opens. Select here the
“Settings” tabulator (see Fig. 2) and click on the wanted type
of measurement.
The gauge electronics adjusts to the zero line as soon as
connection of the measuring electrodes to the Sensor-Unit
has been made. During this transient oscillation phase, no
values are measured even if you have started measurement.
Further information on the steering of measured value re-
cording is given in the operating instructions of the respective
measurement recording instruments.
Fig. 2: “Channel voltage ” window.
5.2 ECG
Either reusable electrodes or single-use electrodes can be
used for ECG.
When a measurement is being made, it will be influenced by
even slight muscle activity. A relaxed sitting or lying position
is therefore necessary during measurement. When sitting, lay
the hands on the thighs.
When the three ECG reusable electrodes (article no.
65981-01) are to be used, prepare a 1 % potassium chloride
solution. Cut paper towels to areas of 3 cm x 8 cm, wet these
small sheets with the potassium chloride solution and then
position them as wetted paper contacts between the ECG
reusable electrodes and the skin.
Now use the rubber bands to fasten one each of the three
reusable electrodes to the inner sides of the two wrists and
directly above the ankle on the inner side of the left lower leg.
Plug the 2 mm thick ends of the three colour-coded single
measurement lines in the electrode sockets according to the
assignment shown in the display. You can now start meas-
urement.
The single-use electrodes (article no. 12559-01) have the ad-
vantage that they can be stuck directly onto the skin without
the need for any preparatory measures. When they are to be
used, first fit the alligator clips (article no. 12673-02) to the
single measurement lines, stick the single-use electrodes on
the skin at the positions described above, but without the pa-
per contacts etc., and clamp the alligator clips to the loose
ends of the single-use electrodes.
5.3 EMG
Either reusable electrodes or single-use electrodes can be
used for EMG.
When three EMG reusable electrodes (article no. 65981-02)
are to be used, use electrode cream (article no. 65981-05) to
improve the contact between skin and electrodes.
Use adhesive plaster to fasten the three reusable electrodes
to the muscles to be measured. Elbow or calf muscles are
suitable for this. Position the reusable electrodes at a suffi-
cient distance from each other one below the other. Now plug
the 2 mm thick ends of the three colour-coded single meas-
urement lines in die sockets of the EMG reusable electrodes
from above to below in the following succession: yellow, red,
green. You can now start measurement.
The single-use electrodes (article no. 12559-01) have the ad-
vantage that they can be stuck directly onto the skin without
the need for any preparatory measures. When they are to be
used, first fit the alligator clips (article no. 12673-02) to the
single measurement lines, stick the single-use electrodes on
the skin at the positions described above, but without the pa-
per contacts etc., and clamp the alligator clips to the loose
ends of the single-use electrodes.
5.4 EOG
The three EMG reusable electrodes (article no. 65981-02)
are also used for elektro-oculography. Use electrode cream
(article no. 65981-05) to improve the contact between skin
and electrodes as in EMG measurements.
Use adhesive plaster to fasten the reusable electrodes to the
following positions in the eye area; to an ear lobe (green sin-
gle measurement line), alongside the left eye (yellow line)
and alongside the right eye (red line). Now plug the 2 mm
thick ends of the three colour-coded single measurement
lines into the sockets of the EMG reusable electrodes. You
can now start measurement.
Single-use electrodes (article no. 12559-01) could also be
used but reusable electrodes are better suited to this applica-
tion, because their smaller area allows them to be more ex-
actly positioned. If single-use electrodes are to be used, fit
the alligator clips (article no. 12673-02) to the single meas-
urement lines, stick the single-use electrodes on the skin at
the positions described above and clamp the alligator clips to
the loose ends of the single-use electrodes.