8
pH/mV Amp
The Signal Outputs
The pH/mV Amp back panel has two BNC connectors labelled pH
Output and Temp Output.
The pH/mV Amp provides two signals, the electrode (pH) signal
indicates the potential at the electrode, while the temperature signal
indicates the temperature of the temperature probe. These signals are
independent of one another and do
not
have to be recorded
simultaneously.
I
2
C Connector
The back panel,
Figure 2–2
, has two DB-9 pin ‘I
2
C bus’ connectors
labelled Input and Output. The Input connector enables connection to
the
e-corder
(or to the output of other eDAQ Amps). This connection
provides power to the pH/mV Amp and carries the various control
signals (for gain range and filter selection) to and from the
e-corder
.
The pin assignments are shown in
Figure 2–3
.
Connecting to the e-corder
Your pH/mV Amp will have been supplied with an I
2
C cable (DB-9 pin
connectors at either end), and two 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 end to the I
2
C Input connector on the back panel of the pH/mV
Amp. Use BNC cables to connect the signal outputs on the back panel
of the pH/mV Amp to the front panel of the
e-corder
as shown in
Figure
2–4
. Please note that you can use the pH Output (electrode signal) or
the Temperature Output by itself: you do not need to have both signal
outputs connected.
Check that all connections are firm. Loose connections may cause
failure to recognize the eDAQ Amp by the software, erratic behavior,
or loss of signal.
Summary of Contents for e-corder pH/mV Amp
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