Metrohm 797 VA Computrace - Manual (Page 67)

3.2 VA measurement modes
797 VA Computrace – Software
55
Voltage step time > Modulation time + 450 ms (HMDE/RDE)
Voltage step time > Modulation time + 470 ms (DME)
Voltage step time > Modulation time + Drop size * 40 ms + 450
ms
(SMDE)
•
Modulation time > 2 / Frequency
• The measurement time
t (i) is defined as follows:
t (i) = Modulation time / 2
CVS - Cyclic Voltammetric Stripping
General:
CVS
or Cyclic Voltammetric Stripping is used to determine
organic additives in electroplating electrolytes. The CVS measuring
mode can be set for the exploratory and determination mode by
selecting
CVS - Cyclic Voltammetric Stripping for the Mode parame-
ter in the EXPLORATORY SPECIFICATION or WORKING METHOD
SPECIFICATIONS window .
Description:
For Cyclic Voltammetric Stripping, the potential of an RDE (e.g. Pt)
is cycled at a constant rate in a plating bath. The current
i is meas-
ured as a function of the voltage U . The curves registered in the
last cycles are stored and its peaks can be evaluated using linear,
polynomial, horizontal or exponential baselines.
i
an
U
i
cath
U
t
Conditioning
Plating
Stripping
Cleaning
Cleaning
Conditioning
Stripping
Plating