Neural Data Acquisition System Chassis

Neural Data Acquisition System Chassis

Model OmniPlex D-DHP

New Features

  • Added ability to add comments during PL2 recordings.
  • Added PL2 recording protection.
  • Added adaptive template, band and 2D polygon sorting.
  • Added high speed scope display mode for current-channel spike view.
  • Added per-channel spectrogram toggling in MultiPlex view.
  • Added percent-sorted sort quality metric.
  • Added ability to order units by peak-to-peak template amplitude (template and band sorting).
  • Added ability to swap selected units.


The OmniPlex System is a compact, flexible platform for high performance data acquisition and powerful online spike sorting.  It offers low latency, superior common-mode rejection amplification and is well known for its user-friendliness. The OmniPlex System is a combination of the OmniPlex chassis, OmniPlex Software, and for new OmniPlex systems purchased today, a Digital Headstage Processor (DHP) subsystem – all described below. Other versions of the OmniPlex system could utilize an OmniAmp or DigiAmp A/D device.

  • The compact OmniPlex chassis is available in two sizes, Rack Mounted and Table Top, and houses cards for synchronization and timing between system components, acquisition subsystem links, digital inputs, and auxiliary analog inputs for non-neural experiment signals.
  • digital headstage processor for neural recording, omniplex, plexon, ephysThe OmniPlex System Controller operates the OmniPlex Software consisting of OmniPlex Server, the “software engine” for neural signal processing, and PlexControl, which is the main user interface providing data visualization and the user interface for interacting with the system.
  • The Digital Headstage Processor (DHP) for use with digital headstages is Plexon’s most advanced subsystem. The DHP now enables up to 512 channels of neural recording, decreased sensitivity to ambient electrical noise, and lighter headstage cables with fewer wires for greater freedom of animal movement. Further, it offers real-time upsampling to 40KHz and adjustment of multiplexer timing offsets (equivalent to simultaneous sampling) for improved sorting quality, trodal acquisition and software referencing  – unlike other digital headstage based systems. Alternatively, the predecessor to the DHP is Plexon’s DigiAmp™ subsystem for analog headstages. The DigiAmp Digitizing Amplifier is available in two sizes: the MiniDigi™ for 16, 32, 48 and 64 channels, and the DigiAmp for 64, 128, 192 and 256 channels. This subsystem is recommended when using analog headstages. Both provide 16-bit A/D conversion at 40kHz per channel for acquisition of the complete wide-band signal. Flexible digital filtering supports a wide variety of filter types (Bessel, Butterworth, Elliptic, 2-12 poles, plus adaptive power line noise filter) and cutoff frequencies, for extracting spikes and field potentials from the wide-band signal and for noise removal.
  • The DHP and the DigiAmp digitizing amplifier are both electrically isolated.

Sorted spike and continuous data acquired by the OmniPlex System is available to external clients (developed through the C/C++ or MATLAB® software development kits (SDKs)) as soon as 1-2 milliseconds after acquisition. This figure is the actual end-to-end latency through the entire OmniPlex System from spike detection input to hardware output, including an online user client program.

The DigiAmps and all modules in the chassis are synchronized via a high-resolution master timing module.  The same master timing module can be extended to synchronize timestamps with compatible equipment such as Plexon’s CinePlex® Behavioral Research System.

A Plexon Sales Engineer is happy to discuss your needs and how the OmniPlex could best support your ephys research goals.


​Selected technical specifications for the OmniPlex System are provided below. A Plexon Sales Engineer is happy to discuss your needs and how the OmniPlex could best support your neural recording and ephys research goals.



Specifications and Options



  • Digital Headstage Processor (DHP) subsystem
  • DigiAmp™ Digitizing Amplifier subsystem
  • DHP subsystem required for use with digital headstatges
  • DigiAmp subsystem required for use with analog headstages

A/D input conversion

40kHz per neural channel at 16-bit resolution

  • Simultaneous sampling
  • Continuous wide-band recording on all neural channels


25 µsec (40kHz)



  • Software selectable digital filtering
  • 2-12 pole filters, Butterworth, Bessel or Elliptic; notch filter

For isolation of field potential and spike frequency bands


Digital selected channel referencing including:

  • Common Average Referencing (CAR)
  • Common Median Referencing (CMR)

For online noise and artifact removal

Digital Inputs

up to 64 channels

Up to four 16 channel ports, individual TTL and/or strobed word data

Auxiliary non-neural A/D inputs

32 channels

16 bit A/D conversion for auxiliary non-neural signals, 250kHz max rate (with “fast” card)

Trodal sorting support

Stereotrode and tetrode


Channel mapping

User-definable mapping sets


Spike sorting

Automatic online in waveform space or directly in 2D/3D feature space

  • Waveform space includes time/voltage using boxes, templates, lines or bands
  • Feature space includes PCA, peak/valley and more
  • Powerful graphical tools for manually defining and adjusting sorting parameters online

File type recorded

Plexon .PL2 and .PLX files

Utility provides conversion between formats


  • Plexon MATLAB®/C++ online and offline SDKs
  • PlexNet (TCP/IP or UDP)
  • NeuroExplorer® online link


Chassis dimensions (inches)

Rack Mounted: 7 1/4 x 13 7/8 x 19 1/8

Table Top: 7 1/4 x 12 1/2 x 9 3/4


Related Products

Plexon OmniPlex Software
Plexon OmniPlex Software
Model OmniPlex Software

The OmniPlex® Neural Data Acquisition Systems rely on two important software programs: PlexControl, which is the main user interface, and OmniPlex Server, known as the system's "software engine". Together, they are referred to as the OmniPlex Software.

Plexon DataLogger
Plexon DataLogger
Model PX.DTL/DataLogger

The New DataLogger system is an untethered, battery powered neural recording system that allows wideband continuous recording at 40 kHz sampling rate. The DataLogger system consists of the Base unit, a 32 channel headstage, an infrared emitter, and the BaseControl software.

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