Metrohm viva 1.0 Manual - Manual (Page 878)

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viva 1.0
t(i)
U
start
U
1
U
step
t
step
U
2
i
an
i
cath
U
U
t
U
step
Potential step (see Chap-
ter 5.5.2.3.2.4, page 406)
t
step
Potential step time (see
Chapter 5.5.2.3.2.4, page
406)
U
start
Start potential (see
Chapter 5.5.2.3.2.4, page
406)
U
1
1st vertex potential (see
Chapter 5.5.2.3.2.4, page
406)
U
2
2nd vertex potential
(see Chapter 5.5.2.3.2.4,
page 406)
i
an
Anodic current
i
cath
Cathodic current
CVS is used in the electroplating industry as a method for determining
organic additives in electroplating baths. This method is an indispensable
part of production control for many types of technical coatings and partic-
ularly in the manufacturing of printed circuit boards for electronic equip-
ment. The most important fields of application are acidic copper baths
and tin-lead baths. Quantitative determination of the additives takes place
via their influence on the deposition of the main component of the elec-
troplating bath. As the measurement utilizes a procedure that corresponds
to the production process, the activity of the additives and thus their
effectiveness in the electroplating process is measured directly.
Calibration factor
The calibration factor is a quantity that is characteristic for the suppressor
used under the given conditions (measuring parameters, metal concentra-
tion, temperature, etc.). It corresponds to the sensitivity of the method
and indicates the suppressor concentration in the measuring cell necessary
for achieving the evaluation ratio specified in the calibration method DT.
The calibration factor is obtained from a measurement with a suppressor
standard solution and is then used to calculate the suppressor concentra-
tion in an electroplating bath sample. (see Chapter 5.6.7.7.20, page 614).