19
Understanding Readings
There are a multitude of
recording errors when the
A1 reference earclip is not
connected to the subject.
The most common are:
• Impedances match or
nearly match at a low value
but do not appear on the
display or in the impedance
head map. (fig. 1)
• No traces appear and
impedance values are zero.
(fig. 2)
• No traces appear and
impedance values are high.
(fig. 3)
Improper Setup: No Connected Reference
fig. 1
fig. 2
fig. 3
