1
ELECTROCHEMISTRY
AND
SI1287
Electrochemical
measurements rely
on the
electrical
aspect of chemical processes
to
provide
readable
data. This is based on Faraday’s law which
relates the change
in mass
per unit area of
a
substance,
to
the magnitude
of the current flowing
through it. Measurements
are made of the voltage and current
acting in
an
electrochemical
"cell", whose basic form
is a
pair
of metal electrodes
immersed
in an electrolyte.
The wide range of studies
to which electrochemical measurements
can be
usefully applied
includes: corrosion, effectiveness
of protective coatings,
batteries, and biological processes.
For these
measurements the SI1287 Electrochemical
Interface can provide
accurate d.c. polarization
to establish the rate of ionization in
the cell and
frequency response
analysis to study the cell impedance
characteristics. The full
spectrum of electrochemical measurement
techniques can thus
be employed to
establish or
study the mechanisms of various electrochemical
phenomena.
2 FEATURES
OF THE SI1 287
The SI1287 Advanced
Electrochemical Interface is an exceptional
adaptable
instrument.
It can stand alone,
or form
the center of
a
powerful
measurement
system.
The SI1287 can
be used either as a
potentiostat
or galvanostat, with
selectable
control
loop bandwidth
to ensure stable
operation
for
various
types of cell. Full
compensation and
correction facilities are
provided
to enable
you to extract the
most useful information
from your
experimental
data,
with
the utmost precision.
Control of
the SI1287 is managed manually from the front
panel keyboard, or
by
simple commands that
are applied from a controller, such as a personal
computer,
via the GPIB. Data
from the SI1287 may be output in the form
most suitable for
your analysis
requirements. ASCII
and
binary
coded data is available,
as
well
as
ASCII coded
status messages.
3 THE
STRUCTURE OF THE SI1 287
Figure 1.1
is a block diagram of the SI1287. The structure
can be considered in
three parts:
-
Polarization control
-
Voltage (Reference
electrode) measurement
-
Current measurement.
In addition to the blocks shown in
Figure
1.1,
the SI1287 also includes:
•
two
independent DVMs,
•
results store,
•
front panel
display and keyboard,
•
battery for
retaining the set up and results store when
power is removed.
CSB/SI1287 User Guide/Issue
AA
1.3
To Next Page
Loading...