Parts of polygraph

• Analog polygraph 


  In an analog polygraph, the displaced air acts on a bellows, an accordionlike device that contracts when the tubes

  expand. This bellows is attached to a mechanical arm, which is connected to an ink-filled pen that makes marks on the scrolling paper when the subject takes a breath.
• COMPUTERIZED POLYGRAPH 


  Polygraph is one kind of electronic instrument, which record the changes of many physiological parameters such as skin conductance, respiration, finger pulses and cardiovascular, etc. it can be used to research and detect the tested person's psychology behavior.
• FOUR MAJOR COMPONENTS OF POLYGRAPH

  1. CARDIOSPHYGMOGRAPH COMPONENT 2. PNEUMOGRAPH COMPONENT 3. GALVANOGRAPH COMPONENT 4. KYMOGRAPH COMPONENT
• CARDIOSPHYGMOGRAP H COMPONENT 


  it was designed to detect changes in the blood pressure and pulse rate of the subject • it can record changes of systolic blood pressure and pulse rate of the subject
• Blood pressure cuff


  which is attached to the upper right arm of the subject, slightly above the brachial artery.
• Sphygmomanometer


  which is utilized to indicate the amount of air pressure inflated in the system.
• Pump bulb assembly


  which is inflates air into the system, also known as an air pump it has a hose connecting the blood pressure the recording pen.
• Resonance control unit


  which is used for reducing or increasing the amount of air pressure to reach the brass bellows and thus reduce or increase the amplitude of pen excursions.
• Centering control


  which is used to provide adjustment of the tracing so that the composite records pattern would be on the guideline.
• Vent


  provide the means by which air in the system can be released.
• Recording pen unit


  which is used to record the blood pressure, pulse rate changes on the chart paper by means of five inch recording pen.
• GALVANOGRAPH COMPONENT 


  its primary function is to detect changes of alterations in skin resistance of the subject
• Finger electrode assembly


  which has a finger electrode plate and retainer bond attached to the left index and ring finger of the subject and a connecting plug designed to fasten the system to the polygraph machine.
• Recording pen unit


  which usually seven inches in length.
• Amplifier unit


  the galvanometer in converting electrical to mechanical current.
• PNEUMOGRAPH COMPONENT


  it is designed to detect changes of respiration of the subject  its major components are the pneumograph chest assembly and recording unit.
• Rubber convoluted tube


  which is ten inches in length corrugated rubber attached to the chest and abdominal area of the subject.
• Pen Lifter


  raises or lower pens to 3 position
• Program Pacer


  a programmable cueing device for question and answer spacing
• Paper Tear Bar


  provides cutting edge for convenient removal of charts.
• Foam Pen Hold Down


  keeps pens in place when instrument is being transported.
• Attached Compartment


  storage for all forms and supplies. Slightly smaller in Executive Ultra Scribe.
• Accessory Storage & Optional Calibration Checking Fixture


  Slightly smaller in Executive Ultra Scribe.
• Subject Connections


  stylish grouping provides neat, professional appearance. Facilitates set – up and storage.
• Mechanical Pneumo Module


  recording part of Mechanical Pneumo channel
• GSR Module


  recording part of GSR channel.
• Mechanical Cardio Module


  recording part of mechanical Cardio Module.
• Paper Storage Compartment


  holds two spare rolls of chart paper or other supplies.
• AC Power Receptacle 


  power cords connects here
• Power Switch and Circuit Breaker


  applies power to instrument built-in reset table circuit breaker protects instrument and eliminates need for fuses. To re-set, simply press “ off “and then “on” again.
• Chart Drive Roller Lever


  lifts chart drive roller for proper changes and chart removal.
• Power Analyzer 


  automatically indicates whether wall outlets is properly wired and grounded for proper instrument operation and subject safety.
• Stimulus Marker 


  marks significant events on the chart.
• Sphygmomanometer Dial 


  reads operating pressure of cardio channels.
• Pneumo 1 


  pneumatic connection for upper (throracic) Pneumograph. Not connected in instrument with only one Pneumo channel.
• Pneumo 2 


  pneumatic connection lower (abdominal) pneumograph.
• Cuff


  pneumatic connection for cardio channel subject cuff tubing.
• Pump


  pneumatic connection for hand pump used to inflate subject cuff.
• Mechanical Cardio Switch


  disengages mechanical cardio module from pneumatic system for low pressure electronic cardio operation
• Multi- Function Module – selectable recording module. Can be used as:

  1. Electronic Pneumo Channel
  2. Electronic Cardio Channel
  3. Cardio Activity Monitor (CAM)
  4. Cardio Tech, or other accessories