Erta Ale is a remote and rarely visited volcano that is known currently to have an active lava lake in its summit crater. Erta Ale has undergone seven eruption events in the past 125 years.
Re: What are the differences between Signal ground, Chasis ground and Earth?? Signal Ground is a reference point from which that signal is measured, due to the inevitable voltage drops when current flows within a circuit, some 'ground' points will be slightly different to others. There may be several signal grounds in a circuit.
The hexaxial reference system is a diagram that is used to determine the heart's electrical axis in the frontal plane. A very slight Right Axis Deviation, possibly due to height and not a posterior block, approximately 110Â° from lead I+. One can tell the rough angle by which lead is isoelectric (or biphasic); in this case lead 1 is most biphasic and thus we know the axis is roughly perpendicular to this lead.