10-38
Figure 10-24.
A.C. current response for
TACV/P
.
In
TACV/P
, the current is sampled at the end of each half-cycle. One variation of
TACV/P
is
DTACV/P
(
D
= Differential), in which a different current sampling
routineis used in order to eliminate the charging current (Figure 10-25 and Figure 10-
26). However, the non-linear relationship between the charging current and the
applied potential may preclude complete subtraction. Therefore, the detection limits
of
DTACV/P
may not be as low as those of other differential techniques (e.g.,
DPV/P
).
APPLIED POTENTIAL
E
ac
CAPACITIVE CURRENT
I
dc
FARADAIC CURRENT
I
dc
SAMPLING TIME
t
Figure 10-25.
Current sampling routines for
DTACV/P
.
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