Defibrillator Analyzer

The Impulse 3000 is a precision instrument that makes the measurements required to thoroughly test the performance of defibrillators. The main function of the Impulse 3000 is to measure the energy output of a defibrillator.

The instrument contains a load resistance -50 ohms- approximating that of the human body. The defibrillator paddles are placed on the contact plates of the Impulse 3000 and the defibrillator is discharged into the load. The instrument calculates and displays the energy delivered.


The impulse 3000 performs the following functions for testing defibrillators:

  • Measures the energy delivered to the load
  • Performs a cardioversion test by simulation a heartbeat at the ECG leads and measuring the delay time from the R-wave peak to the firing time of a synchronized defibrillator. The ECG signal is also present on the paddle contact plates for pickup by the defibrillator directly through the paddles
  • Outputs a voltage -attenuated signal of the defibrillator pulse in real time for viewing on an oscilloscope
  • Plays back the defibrillator pulse at a slow speed out the ECG leads for viewing on a cardiographic recorder


  • The impulse 3000 has two energy ranges. The low range is designed to be especially useful to test low-power defibrillators, including internal defibrillators.
  • An internally generated pulse, similar to an actual defibrillator pulse, can be used to test the equipment under test (EUT) or to simulate a pulse when desired.
  • The paddle contact plates are connected to the ECG signal so the defibrillator can pick up the heartbeat waveform through its paddles. The paddle contact plates have a provision (a hole in the mounting screw) for plugging in special contacts for internal defibrillator paddles. These contacts are included as standard accessories. In addition, special contacts for connecting to specific defibrillators are available as optional accessories.
  • The Impulse 3000 can be powered from a battery for portable operation, or from the line with the Battery Eliminator.
  • The Impulse 3000 uses a true differential amplifier input so that the defibrillator can be fired from either polarity. The energy is measured correctly even from grounded defibrillators. For proper polarity of the scope output, put the apex (+) paddle on the right and the sternum (-) paddle on the left.
  • The Impulse 3000, under control of a microprocessor, measures and stores the instantaneous voltage of the defibrillator pulse every 125 microseconds, 512 times, fiving a measurement window of 64 milliseconds.
  • The instrument has a serial RS-232 port that can be used to output test results to a printer, the medTester (software version 3.16 and above), or other devices.
  • The medTester interfaces with the Impulse 3000 via a specialized cable available from DNI Nevada and the RS-232 of both units.