7
I
GENERAL INFORMATION
A. INTRODUCTION
The DAGAN Model 2400 EXTRACELLULAR PREAMPLIFIER CURRENT
PUMP is a low noise preamplifier system for extracellular recording
with both glass and metal microelectrodes or micropipettes.
The high input impedance assures faithful reproduction from
electrodes ranging into the hundreds of megohms. In addition to
producing low noise voltage preamplification, the 2400 is unique in
that it also provides an audio amplifier for audible monitoring of the
preamplifier output and two types of current injection to the
microelectrode. One type is used for high current cell staining and
the second is a precise ideal constant current source capable of both
front panel and external analog programming control of magnitude
and polarity. It is potentially useful for cell staining, iontophoretic
drug injection and as a stimulating current (polarize or depolarize).
In addition the Model 2400Z uses the CURRENT PUMP for
microelectrode resistance measurements.
The 2400 also provides optimum bandwidth tailoring for maximum
signal to noise ratio by incorporating both active high pass and low
pass push button switch selection filters. And to reject AC line noise,
an independently, operated LINE NOTCH FILTER provides a 200 to 1
reduction in 60 Hertz interference. When powering the 2400 from
standard AC power lines, no batteries are ever needed to achieve
the low noise performance.
The 2400 is packaged within an attractive, heavy-duty cabinet for
either rack or bench mounting. When used by itself or as a
component of a larger system, this instrument will truly become an
indispensable laboratory tool.
B. INSTRUMENT & ACCESSORIES
The Model 2400A is shipped with the following standard accessories:
Rack adapter (handles/bracket assemblies).
Probe mounting rod for micromanipulator
