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Programmable AC Amplifier 4110
Description
The Dynamics 4110 dual channel programmable AC Amplifier is
a dual-channel, high gain device. It was designed for use in
neuro-physiology and physiology research using surface, intracellular,
extracelluar, or micro-machined silicon electrodes. This amplifier
comes complete with high and low pass filters for working with
very sensitive low level signals. The 4110 is typically used
as a second stage high gain amplifier following an X1 or X10
pre-amplifier from the electrode to remove DC and low frequency
voltage signals.
Design Features
The Dynamics 4110 has four discrete user programmable high
pass filters set at 1, 5, 100, and 500 Hz. Four selectable low
pass filters set at 1, 5, 10 and 20 kHz are provided to prevent
high frequency noise from affecting the digitizing system. An
innovative multi-stage gain amplifier is used to handle the
high gain bandwidth requirement (20 kHz bandwidth X 50K gain
= 1 GHz bandwidth) and to provide fine gain control with gains
up to 50,000 in 65,000 discrete steps. An LED overload light
on the front panel serves as a quick visual indicator of signal
saturation.
Gain Setting
The 4110 is designed to quickly troubleshoot large channel
count applications. If a noisy signal is found, the input to
the amplifier can be disconnected and shorted using an on-board
relay to determine if the noise is generated before or after
the amplifier. A low level selectable 200mV or 2mV 1 kHz sine
wave oscillator can be switched into the input to verify that
the amplifier is operational and at a proper gain setting.
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