Specialized Tools for Electrophysiology and Cell Biology Research

(NL844) 4-Channel Pre-Amplifier

Product Summary

The NL844 pre-amplifier is specifically designed to operate in conjunction with the NL820A Isolator. Its low noise and high impedance differential inputs make it particularly suitable for use as a headstage pre-amplifier close to the preparation, ideal for isolated EMG, EEG or ECG applications.

  • Very low noise
  • Up to four channels can be used
  • Fast recovery time from stimulus artifact pulses

The NL844 features 4 pairs of colour coded 1.5mm DIN "touch proof" sockets for electrode connection as well as a COM input. The unit can be operated in 1, 2, 3 or 4 channel modes with unused channels switched off using the rear panel toggle switches.

This unit is particularly suited for use where there are very large stimulus artifacts, for example when used close to a magnetic stimulator coil. The input circuit automatically adjusts to the DC input conditions plus a non-linear filter modifies its time constant if the differential input signal exceeds its normal ± 0mV working range. Therefore, fast, short artifacts do not block the subsequent stages. This results in an amplifier with a very fast recovery time from stimulus artifact pulses.

Gain x100, x1,000, x10,000 (operated in channel pairs)
Low Frequency Cut 3, 10, 30 Hz (operated in channel pairs)
High Frequency Cut With NL820A > 35 kHz -3dB
Input Impedance 100 MO
Input Channels 4
Common Mode 10,000:1 (-80 dB) (with NL820A -120 dB)
Noise 5 ¼V RMS full bandwidth
Lead Length 2.5 m

Customers from Europe and Australia can use the Multi Channel Systems - Online Shop to order Warner products or create quotes.

Order No. Model No. Product Description USA Price Order
65-0362 NL844 4-Channel preamplifier Login Login

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