ADInstruments pH Amp, Руководство пользователя

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Chapter 2 Setting Up
19
Multiple Front-ends
Multiple ADInstruments front-ends can be connected to a PowerLab.
The number that can be connected depends on the number of input
channels on the PowerLab, since each front-end signal output requires
an analog input channel of the PowerLab. The initial ADInstruments
front-end should be connected as shown in Figure 2–1. The remainder
are linked via I
2
C cables, connecting the I
2
C Output of the previous
front-end to the I
2
C Input of the next, as shown in Figure 2–2. The
signal outputs of each ADInstruments front-end are connected to a
seperate input of the PowerLab.
Using ADInstruments Programs
Front-ends are used with PowerLabs and ADInstruments programs
such as LabChart and Scope. The combined amplification and filtering
of the pH Amp, the PowerLab and the program are presented as a
single set of software controls, replacing the Input Amplifier dialog
with the pH Amp dialog. The LabChart Help Center and
Scope User’s
Guide describe the Input Amplifier and Stimulator dialogs, and
explain some of the terms and concepts used here.
The documentation for LabChart and Scope does not cover front-end-
specific features. These features are described in detail here for
LabChart. Differences between LabChart and Scope should be fairly
obvious from perusing the
Scope User’s Guide . For the most part,
dialogs for the different application programs are much the same.
Temp Output pH Output Temp Output pH Output
I
2
C output I
2
C input
PowerLab I
2
C output I
2
C connector cable
Figure 2–2
Connecting two pH Amps
to a PowerLab: a
connection is made from
the I
2
C Output on the first
front-end to the I
2
C Input
on the second front-end