Pneumo – Two Respiration Input Channels
EDA – Galvanic Skin Response
Cardio – Blood Volume / Pulse Rate

We currently offer a Plethysmograph (PLE) Model 76599LX to measure finger pulse and blood volume, Activity Sensor Model 76879S to measure any movement by the subject to help identify countermeasures. A total of seven channels can be recorded at one time.

Charts are recorded in much the same manner as conventional polygraph instrumentation with a smooth scrolling display moving from right to left. The tracings recorded are in real-time and are truly rectilinear, so charts can be easily interpreted. See polygraph software page for a sample of the tracings. The system can be operated using a mouse / pointing device or the keyboard.

Product Specifications

  • Size: 10.25″ W x 3.25″ D x 1.25″ H (26.04cm x 8.26cm x 3.18cm)
  • Weight: 1 lb (454g)
  • Communication Interface: USB
  • Power Supply Requirements: Receives All Required Power Through USB Connection
  • Range: 10Kohms to 2.0Mohms
  • Isolation: 1500V RMS


Cardio Arm Cuff 1 0 to 110mmHG
Pneumograph Chest Assembly 2 +/-80mmHG
EDA 1 Current Applied to Skin 10µA, 0 to 4VDC
Auxiliary Input 3 0 to 4V Analog Input


  • At least a 1.5 GHz processor recommended
  • 3 GB RAM for 32-bit OS or 4 GB RAM for a 64-bit OS
  • 80 GB harddrive, with at least 20 GB free for video recording
  • Windows XP SP3 or greater, Windows Vista 32/64, or Windows 7 32/64
  • Super VGA (1024×768)
  • Support for DirectX 9 graphics with:
    • WDDM Driver
    • 128 MB of graphics memory
    • Pixel Shader 2.0 in hardware
    • 32 bits per pixel
  • DVD-ROM or DVD-RW drive
  • Audio Output
  • Keyboard and Microsoft ® Mouse or compatible pointing device
  • Available USB 2.0/3.0 Ports. Connecting a video camera to an external USB hub is not recommended.
  • Digital sound card required for multimedia capabilities
  • Digital video camera required for video capture. Logitech or Microsoft web camera recommended. Many popular IP (networked) cameras are supported by LXSoftware. However, IP cameras may experience audio/video lag or other undesirable behavior. The use of a directly-attached camera is highly recommended.
  • External Microphone may be required for recording audio, depending upon host computer’s configuration (e.g. no built-in microphone), examine / examinee location, ambient noise, etc

* Additional resources may be required for certain video devices. Always consult the documentation for any selected video device to ensure the host computer meets the stated system requirements.
Product Features

  • Our new USB Interface enables the LX4000 to communicate with virtually any Windows based PC computer.
  • The LX4000 is capable of simultaneously displaying and recording seven input signals
  • The LX4000 is Small and Compact, making transporting it even easier.
  • The Redesigned EDA Circuit has a greater operating range, increased sensitivity and subject isolation.