A-M Systems

The Microelectrode AC Amplifier (Model 1800) is a two-channel, differential amplifier with head stage probes that are intended for extracellular recording and/or stimulating with microelectrodes. This Instrument is designed to work 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 using human subjects.

Features

   Metal microelectrode amplifier
   Two amplifiers in one instrument
   Two head stage probes
   Low cost
   Recording gains: x100, x1000 or x10,000
   Low noise (25 µV peak to peak 10 Hz -10 kHz)

   High common-mode rejection (>70 dB @ 60 Hz)
   High line frequency rejection with notch filter (>110 dB @ 60 Hz) (50 Hz optional)
   High input impedance (100,000 MOhm )
   Low input bias current (100 pA typical; 300 pA maximum)
   Adjustable low and high frequency filters
   Power: 110 VAC @ 60 Hz (220 VAC @ 50 Hz)

MODE SELECTION This switch allows  the user to select one of three Modes for each channel of the amplifier: IMP Mode (Impedance Check), REC Mode (Record), and STIM Mode (Stimulate). 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 capacitance during the electrode impedance check. The output signal is 100 mV per MOhm . In the 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 through the electrode.  Output signal is 100 mV per µA.

GAIN SELECTION  In the Record Mode, the gain of each amplifier may be independently set by adjusting the GAIN switch to x 100, x 1000, or x 10,000.

Physical Dimensions:   43.2 cm x 12.1 cm x 28.6 cm

AC Power:   This is the standard power source. Either 110 V/AC or 220 V/AC may be used. 

Line frequency:   60 Hz standard, 50 Hz optional (no extra cost). These are  set at the factory and must be indicated at the time the order is placed.

HEAD STAGE    Input: 2.0 mm female pin connector. Body: 1.36 cm diameter x 4 10.2 cm length., Mounting Rod: 4.7 mm diameter x 9.5 cm length. 
                         Input Cable: 1.5 m Superflex silicone jacketed cable.

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