ADInstruments Bio Amp, Руководство пользователя

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Bio Amp Owner’s Guide
22
Connecting to the PowerLab
To connect a front-end to the PowerLab, first ensure that the PowerLab is
turned off. Failure to do this may damage the PowerLab, the front-end, or
both.
Connect each signal output on the rear panel of the Bio Amp, Dual Bio Amp
or Octal Bio Amp, to an analog input on the front panel of the PowerLab
using a BNC cable. If the PowerLab has differential (rather than single-ended)
inputs the BNC cable must connect to a positive analog input of the
PowerLab. ADInstruments applications will not find the front-end on starting
up if a negative input is used.
Connect the I
2
C output of the PowerLab to the I
2
C input of the front-end
using the I
2
C cable provided. Figure 2–1 shows how to connect up a single
front-end to your recording unit.
Check that the plugs for the I
2
C bus are screwed in firmly. Check the BNC
cable for firm connections as well. Loose connectors can cause erratic front-
end behavior, or may cause the front-end to fail to work at all. The BNC cable
can be tucked under the front-end to keep it out of the way if desired.
Multiple separate front-ends can be connected to a PowerLab. The number of
front-ends that can be connected depends on the number of input channels
on the PowerLab, since each signal output from the front-ends connects to
one of the analog inputs of the PowerLab.
Only one front-end such as a Stimulus Isolator can be connected to the
(positive) output of the PowerLab. The initial front-end should be connected
PowerLab I
2
C output
Front-end I
2
C input
I
2
C connector
cable
BNC connector cable Front-end Signal Output
Figure 2–1
Connecting a front-end to
the PowerLab: a PowerLab
has only one I
2
C output,
and each front-end has one
I
2
C output and one I
2
C input