NEULOG ELECTROCARDIOGRAM LOGGER SENSOR GUIDE
The electrical voltage is measured on the skin using conducting leads and
converted into a graphic that is very standard and reproducible.
P
: Contraction of atria
Q
: Initial depolarization of the ventricle
R
: Early depolarization of the ventricles
S
: Late depolarization of the ventricles
T
: Repolarization of the ventricles
U
: Often hidden by the T wave – this wave has an unknown origin
This graph represents one complete heart beat from depolarization of the
Sinoatrial Node to repolarization of the ventricles.
Connecting to the ECG sensor:
The NeuLog electrocardiogram sensor uses three reusable clip leads for
easy connection to the arms and legs. The heart’s electrical fluctuations can
be measured as a voltage signal appears between the left and the right arms.
This is a noisy signal and very difficult to measure. Instead, it is much
better to use a reference electrode (usually connected to the left leg) and to
measure the voltages of the left arm and the right arm in reference to this
electrode and to amplify the difference between them. This is how it is done
in NUL-218.
Leads:
Black: Reference
Red: Left
Yellow: Right
In order to prevent any effect of electrical power or PC signal on the test
subject, the NUL-218 is completely electrical power and signal isolated.
How to connect:
1.
Connect the NeuLog ECG sensor to a smart device using one of the
following guides. (PC or Mac/Tablet/Viewer)
2.
Wet the red clip and place it on the subject’s left wrist with the metal
connector on the underside (palm side) of the arm.
3.
Wet the yellow clip and place it on the subject’s right wrist with the
metal connector on the underside (palm side) of the arm.
4.
Wet the black clip and place it on the subject’s left leg or forearm or
elbow.
5.
Connect the three alligator clips (red, yellow, black) directly to their
corresponding arm clip’s (red, yellow, black) metal piece that forms a
loop.
6.
You are now connected.
Note:
There are other configurations possible, this is just one possibility. If
the R wave shows a downward slope instead of upward, your connection’s
polarization is reversed though the absolute results are still the same.