eDAQ Picostat, User Manual

Page: 15 / 122

Chapter 2 — The Potentiostat 11
The construction of the Faraday cage can range from a simple
cardboard box covered with aluminium foil, in which the
electrochemical cell is located, to a more sophisticated copper mesh
enclosure or sheet-metal box. But in all cases, it is essential that the
Faraday cage be electrically grounded to act as an effective shield
against electrical interference.
The Potentiostat itself is grounded via its connection to the e-corder unit
which is in turn earthed via the three pin mains power connector. It is of
course important that the power socket that you are using is well
earthed.
Connecting the Potentiostat
Your Potentiostat will have been supplied with an I
2
C cable (DB–9 pin
connectors at either end), and three cables with BNC connectors at
either end.
First make sure that the e-corder is turned off. Then connect the I
2
C
cable to the I
2
C connector on the back panel of the e-corder , and the
other the other end to the I
2
C Input connector on the back panel of the
Potentiostat. Use the three BNC cables to connect the back panel of the
Potentiostat to the front panel of the
e-corder as shown in Table 2–2 .
With these connections, when you use the software to set a more
positive voltage, a more oxidising potential will be applied at the
working electrode.
Potentiostat rear panel e-corder front panel
I Out Input 1
E Out Input 2
E In
Potentiostat rear panel e-corder front panel
I Out Input 1
E Out Input 2
E In Output –
Table 2–2
Potentiostat to e-corder
connections as shown in
Figure 2–5 and Figure
2–6 .
Table 2–3
Potentiostat to e-corder
connections, reverse
polarity.