Introduction
14
Figure 2-1
Typical Electrochemical Test System Using an IMX8 Multiplexer
The
system computer
is a critical component of the system. It controls the IMX8 by sending it simple
commands through a USB connection.
The most important function of these commands is to select which cell is
active
(connected to the
system
potentiostat
). You can think of an IMX8 as a complex switch. One of the eight
cell cables
on the IMX8 is
switched so that it connects to the potentiostat’s cell cable. All of the wires (including sense leads and shields) in
the cell cable are switched. Other commands select the IMX8’s control mode for the cells that are
inactive
(not
presently connected to the potentiostat).
The
system computer
also controls the
system potentiostat
. Most modern potentiostats generate digital
signals. Primarily, a standard USB connection is used to digitally control these potentiostats. In the case of
analog potentiostats, analog signals from a D/A and A/D computer interface can be sent. When a cell is
connected to the system potentiostat cell leads, the computer causes a test to be run on that cell. The test can
be as simple as a single current or potential measurement or as complex as a cyclic scan or acquisition of an EIS
spectrum. The computer software and
system potentiostat
are responsible for taking the measurement and
storing it.
The
system potentiostat
in Figure 2-1 is shown as a “black box”. The IMX8 is designed to work with virtually
any potentiostat. The relays in the IMX8 can carry currents up to 1.5 A, allowing use of the IMX8 with most
high-performance potentiostats.
In a typical IMX8 experiment, the
system computer
cycles through the cells. Each cell is connected in turn to
the
system potentiostat
and used to collect a measurement. Usually, the computer delays at the end of each
cycle through the cells so that the measurements on each cell are separated by a fixed time period.
Содержание IMX8
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