A-M Systems
131 Business Park Loop, P.O. Box 850 Carlsborg, WA 98324
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Telephone: 800-426-1306 * 360-683-8300 * FAX: 360-683-3525
E-mail: [email protected] * Website:
General Description
Instrument Features
The
AC/DC Differential Amplifier, Model 3000
is a single-channel, differential amplifier
that can be used with or without a head stage probe. The instrument is designed for
low-noise recordings from excitable tissue. It is intended for extracellular recording
and/or stimulating in conjunction with microelectrodes. It can be used in a number of
research or teaching applications requiring extracellular neurophysiological recording
from excitable tissue, such as nerve, muscle (EMG), EEG, EKG, and ERG recordings.
The instrument is not intended for clinical measurements using humans.
The
Model 3000
contains a high-gain, low-noise differential amplifier stage followed by
low frequency, high-frequency, and notch filters. Three operating modes are available
to accommodate recording, stimulating, and verification of electrode impedance.
Record Mode offers six levels of signal gain (x50, x100, x500, x1000, x5000, and
x10,000). Stimulus Mode allows the current passing through the electrode to be
measured during stimulation at six levels of gain (5V/mA, 10V/mA, 0.05V/µA, 0.1V/
µA, 0.5V/µA, 1V/µA). Impedance Mode utilizes an internally calibrated current source
to allow in situ verification of electrode impedance and adjustment of capacitance
compensation. Units that are sold with a head stage are pre-configured to work with
the headstage, and the front panel gain values include the gain of the headstage.
Controls and Connectors
Input Controls
PROBE:
This 15-pin connector receives a signal either directly from the electrodes (non
head stage version) or from the Head Stage probe for further processing.
INPUT SELECT (DIFF-MONO-GND)
(non headstage version only)
:
This switch sets the
input for differential operation, monopolar operation, or grounds the inputs to the
amplifier.
INPUT LEADS
(standard)
:
Supplied with the Model 3000 is a DB-15 connector with three
leads. The black wire is the “+” electrode lead. The white wire is the “-” reference
lead. The silver wire is a driven shield, and
should not be grounded!
This wire
serves to minimize signal loss due to capacitance.
HEADSTAGE PROBE
(optional)
:
The Headstage Probe has three sockets for connection
to electrodes.
PROBE+
is used to connect to the electrode (usually a high impedance
recording microelectrode; It is the larger 2mm jack).
PROBE-
is used to connect to the
indifferent lead. Either the
PROBE GND
connector, or the front panel
GND
must be
Summary of Contents for 3000
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