Grass Model 15LT Physiodata Amplifier System
with Model 15A54 Quad Neuroamplifier(s)

by Grass Technologies

Grass Amplifier
Description
The Grass Model 15LT amplifier system is integrated and tested with your VERIS System prior to shipping from EDI. The 15A54 bipolar AC neuroamplifer is a high performance amplifier designed specifically for neurophysiological measurements. It is controlled entirely by the VERIS software, eliminating any possibility of incorrect setting of dials and/or switches that can occur with manual amplifiers. As many as four 15A54 quad amplifiers can be included with the Model 15LT system, providing up to 16 recording channels.

Features & Specifications:

Model 15LT Amplifier System
  • Unique electrode interface system simplifies electrode to amplifier connection (shown above).
  • Built-in calibration and electrode impedance test.
    • The calibrator provides both AC and DC calibration voltages from 5 µV to 1 mV under computer control.
    • AC calibration frequencies of 0.3, 1, 3, 10, 30, 100, 300 and 1000 Hz are standard.
  • A Trace Restore function is included for returning all amplifier outputs to zero.

Model 15A54 Quad Neuroamplifier Module
  • Each module provides four amplifiers (recording channels).
  • True 250 volt subject isolation.
  • Four-pole active low pass Bessel filters for outstanding filtering performance and minimum phase distortion.
  • Input Characteristics
    • Amplification: 50 minimum to 200,000 maximum
    • Amplification Settings: 5, 10, 20, 50, 100 and 200; x10 and x1000, ±2% accuracy
    • Low Cutoff Frequencies (-6 dB): 0.01, 0.1, 0.3, 1, 3, 10, 30 and 100 Hz
    • High Cutoff Frequencies (-6 dB): 0.03, 0.1, 0.3, 1 and 6 kHz
    • Input Impedance: 20 Megohm, differential, 35 pF at connector per terminal
    • Common Mode Rejection: 30,000:1 (90 dB) at 60 Hz
    • Noise:
      • 3 µV peak to peak, referred to input, inputs shorted, 100 Hz bandwidth
      • 10 µV peak to peak, referred to input, inputs shorted, 6 kHz bandwidth
  • Output Characteristics
    • Type: Single-ended, clipped at approximately 10 volts peak to peak
    • Output Impedance: 300 ohms
    • Output DC Level: ² 20 mV adjustable
    • Connector: 37 pin DSUB