eDAQ Picostat, Руководство пользователя

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46 eDAQ Potentiostats
I
2
C Connectors
The QuadStat back panel, Figure 4–2 , has two DB-9 pin ‘I
2
C bus’
connectors labelled Input and Output. The Input connector provides
power to the QuadStat and carries the various control signals (for gain
range and filter selection) to and from the
e-corder connection. A cable
is provided with the QuadStat for this purpose. The pin assignments are
shown in
Figure 4–4 .
The Output connector can be used for the attachment of another
QuadStat, or other eDAQ Amp.
More information about the I
2
C connector can be found in your
e-corder Manual .
Grounding Connector
The QuadStat back panel, Figure 4–2 , has a 4 mm grounding socket.
This enables connection of a Faraday cage (with the green grounding
cable included with the QuadStat) the use of which can greatly
diminish electrical noise.
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. In all cases, it is essential that the
Faraday cage be electrically grounded to act as an effective shield
against electrical interference.
The QuadStat 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
also important that the power socket that you are using is well earthed.
You can try grounding the Faraday cage via its own connection to
earth,
or via the QuadStat ground cable — but not by both methods
simultaneously. The purpose of this ground cable to the Faraday cage is
to provide an easy means of grounding the cage — please note that it
is not for grounding the QuadStat itself. If your Faraday cage is already
earthed by its own ground connection then you should not use the
QuadStat ground cable! Use of the QuadStat cable in this instance will