Model 1800 2-Channel Microelectrode AC Amplifier

Price: $1600.00


EXTRACELLULAR RECORDING/STIMULATING WITH HIGH-IMPEDANCE METAL MICROELECTRODE

Each channel of the Model 1800 contains a high-gain, low-noise differential
amplifier stage followed by low-pass, high-pass, and notch filters.

A-M Systems Model 1800

Low Noise

1 µV p-p
Greater Than 100 dB CMRR

Easy to Use

Analog Controls
Record or Stimulate Modes

Customizable

Spike & LFP/EEG Recording
Gain and Filters

The Model 1800 Microelectrode AC Amplifier is a two-channel, differential amplifier intended for extracellular recording and/or stimulating with high impedance metal microelectrodes in research and teaching applications. Ideal for single-cell spike recordings, it can also 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.

Each channel of the Model 1800 contains a high-gain, low-noise differential amplifier stage followed by low-pass, high-pass, and notch filters. Three operating modes are available to accomodate recording, stimulating, and verification of electrode impedance. Record Mode offers three levels of signal gain (x100, x1,000, x10,000). Stimulus Mode allows the current passing through the electrode to be measured during stimulation. Impedance Mode utilizes an internally calibrated current source to allow in situ verification of electrode impedance.

In addition, we can modify the Model 1800 to record both spike and LFP\EEG from the same electrode-headstage combination, by routing the post headstage signal to both Model 1800 channels, where each channel has independent gain and filtering. This modification is done in such a way as to preserve complete functionality of both channels, in case you want to revert to normal usage modes. Please contact us for pricing and ordering information.

Model 1800 Headstage

For proper operation, the purchase of two Model 1800-compatible headstages (Catalog#: 700500) is required.

The Model 1800 includes:

  • Operator's manual
  • Rack mount hardware

  • Amplifier for metal microelectrodes
  • Two amplifiers in one instrument
  • Recording gain options: x100, x1,000, x10,000
  • Low noise (1.0 µV p-p typical, 10 Hz–10 kHz)
  • High common-mode rejection ratio (100 dB at 60 Hz)
  • High line frequency rejection with notch filter (>110 dB at 60 Hz)
  • High input impedance (100,000 MΩ)
  • Low input bias current (±3 pA typical; ±20 pA maximum)
  • Adjustable low and high frequency filters

Headstages Required for Model 1800

The Model 1800 requires the use of pre-amplifying headstages. Headstages are purchased separately, and are calibrated to the base unit at the time of purchase. The headstage for the Model 1800 is small and convenient. It is 0.535 inches (1.395 cm) in diameter and 4 inches (10.2 cm) long.

It includes a 0.187 inch (4.7 mm) diameter mounting rod and 5 feet (1.5 m) of Superflex silicone-jacketed cable which resists mild alkalis, acids and solvents. This cable can be increased to a total length of 12 feet if needed. Please contact us for information and pricing.

Current Model 1800 Headstages are furnished with short interconnects designed to mate with any metal electrodes that terminates in Cooper/Wire-Pro/Amphenol style Reliatac 220-P02 connectors (our product number 520200), including all of A-M Systems metal electrodes.

To use glass micropipette electrodes with the Model 1800 headstage, a compatible microelectrode holder should be purchased. Any pipette holder with a 2 mm pin can mate directly with the headstage without the use of the interconnect. Older Model 1800 headstages (sold prior to March 2013) accept slightly smaller pins for the (+) signal input, and can mate directly to our 1.6 mm pin holders.

Model 1800 Amplifier Modifications

Like all of our instruments, it is possible to modify the gain or filter frequencies of the Model 1800 to meet your specific requirements.

Headstage cables can be extended up to 12' for an additional fee. It is best if this is done at the time of purchase, as the extended cable length does impact performance, and can be corrected by our standard calibration procedure. If you choose to extend the cables at a later date, you would need to return the base unit as well as the headstages for the modification and re-calibration.

TTL Mode Control

For users who would like to control the mode of the Model 1800, we can install a rear panel BNC to enable computer (TTL) control of the channel mode (REC or STIM). This modification can be installed on one or both channels.

Simultaneous Spike & LFP/EEG Recording

Many users would like to record both spike activity and LFP/EEG signals simultaneously from the same electrode. This modification routes the post headstage signal to both channels of the 1800, where the user can set filters and gains indendently in order to record their signals of interest. This modification is done in such a way as to preserve complete functionality of both channels, in case you want to revert to normal usage modes.

Please contact us for pricing and ordering information regarding any of the modifications.

Catalog # Product Price
749918 Extended Warranty, 2 Years-Model 1800 with two headstages
Price: $225.00
700500 Model 1800 Headstage
Price: $355.00
749218 Headstage Cable Extension (Max 12 Feet) for Model 1800
Price: $112.00
520200 Male Miniature Pin Connector Fits Model 1800 / 3000 Headstage Leads
Price: $76.00
521200 Male Pin Connector (fits Model 1800, 3000 Headstages)
Price: $35.00
701900 Headstage Input Connector Cable Set (for Models 1700/1800/3000 Headstages)
Price: $35.00
701700 3' Input Cable (5-pin connector to dual-banana plug)
Price: $63.00
701800 3' Input Cable (5-pin connector to BNC)
Price: $63.00
688000 Rack Mount Hardware for 3.5" Instruments
Price: $25.00
A-M Systems instruments are not approved for use with human subjects in either a clinical or research environment.
Catalog #:700000
Price: $1,600.00
Loading...