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Owner’s Guide
23
The single Bio Amp is supplied with a 3-lead Bio Amp cable with lead wires. The Dual Bio
Amp is supplied with a 5-lead Bio Amp cable and separate lead wires; it uses a shared
ground signal for its Bio Amp inputs. The supplied cables are of the type used for ECG
or EMG studies: Tronomed D-1340 or Tronomed D-1540 cables respectively. The cable
has a yoke with three or five sockets for the lead wires. Note that the active pins of a
shielded cable are those closest to the label.
The lead wires supplied are of the type used for ECG studies. They click into place in
the cable yoke, and have snap connectors at the other end to connect to typical ECG
electrodes. The leads are color-coded for identification. The labels on the Bio Amp cable
also have color spots to help sort out which cables connect where and what they are
measuring. (The colors are arbitrary, since the PowerLab system is for general-purpose
recording.)
Connections to the Octal and Quad Bio Amp inputs can be made with the supplied lead
wires. The input sockets are for unshielded, single-ended lead wires with a 2 mm inside
diameter with 1.5 mm pins.
ADInstruments supplies other types of lead wires that connect to the Bio Amp cable
yoke. Also available are disposable and reusable electrodes, electrode cream (for
reusable electrodes), and abrasive gel, for lightly abrading the skin before the electrodes
are attached.
The Bio Amp Cable Input
Connections are made to the Bio Amp using the three shrouded 1.5 mm male pin
sockets on the front panel. The sockets are of a sort commonly used with life science
connection leads, and their arrangement is shown below.
Two types of leads are provided: one set of 3 individual leads terminating in alligator
clips (commonly used for animal or in vitro recordings) and one shielded Bio Amp cable
with detachable snap-on leads (commonly used for human recordings).
Ref
+
-
Ground/Reference
(green)
Positive input
(red) Negative input
(black)
The sockets provide two pins for a diff erential input signal (+ or red, – or black), and an
input for an isolated Ground/reference (Ref or green). The Ground/reference electrode
should always be attached to the subject under investigation (or to the recording
preparation), providing a zero reference for the diff erential amplifier. Then the active
(+) and reference (-) electrodes should be securely attached to the subject or recording
preparation, for example, ECG recording leads on opposite sides of the chest, or needle
electrodes at diff erent sites over a nerve.
The Bio Amp cable for the Dual Bio Amp, plugs into the six-pin input socket on the front
panel of the Dual Bio Amp. A notch in the plug ensures that polarity is correct. Only the
Figure 3–4
The pin
assignments
for the single
Bio Amp input
connector