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Model 1800 Microelectrode AC Amplifier is a two-channel, differential
amplifier equipped with Head Stage probes and is intended
for extracellular recording and/or stimulating with high impedance
metal microelectrodes in research and teaching applications.
Extracellular neurophysiological recordings with high impedance
microelectrodes can easily be done from excitable tissues
such as nerve and muscle. The instrument is not intended for
clinical measurements in human subjects.
Special Features:
Mode Selection: This switch allows the user to select one
of three Modes for each channel of the amplifier: Impedance
Check (IMP), Record (REC), or Stimulate (STIM). During Impedance
Check, an internal 1 kHz oscillator automatically applies
a calibrated current through the electrode and the amplifier
monitors the voltage in order to check impedance.
Capacity: This control is used to neutralize the capacitance
during electrode impedance check. In record mode, the instrument
amplifies the differential input signal by an amount selected
by the Gain switch. In the Stimulate mode, a stimulus is applied
directly to the electrode through the Stimulus connector,
and the amplifier monitors the current passing throught the
electrode.
Gain Selection: In the Record mode, the gain of each amplifier
may be independently set by adjusting the Gain switch to x100,
x1000, or x10,000.
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