ZOLL PD 2000 - 4 Pace;Defib Stimulator Board; Defibrillator

FUNCTIONAL DESCRIPTION
4, PACE/DEFIB STIMULATOR BOARD
The Stimulator Board includes circuitry for patient stimulation in two
modes of operation: defibrillation and pacing.
4A. DEFIBRILLATOR
The Defibrillator circuit is responsible for three major functions:
1. charging the high voltage capacitor to the level specified by
the front panel setting.
2. providing feedback on the high voltage capacitor's voltage
level.
discharging the high voltage capacitor energy through
paddles or the Multi-Function Cable. `
The Defibrillator portion of the stimulator Board is active only when the
front panel switch is set to DEFIB ON.
Charging
A charge may be initiated in two ways - pressing the Charge button on
the Front Panel or pressing the Charge button on the Paddles. When the
CPU detects a charge request, it controls the charging process as follows:
The defibrillator circuits begin charging the high voltage capacitor to the
target voltage for the energy selected from the front panel or the Paddles
select arrows and indicated on the CRT. The CPU continuously monitors
the VCAP signal to ensure that the high voltage capacitor charges at the
proper rate. Improper operation results in an internal dump and display
of a warning message. When the target voltage is reached, the CPU
initiates a continuous beeper tone to indicate that defibrillator is ready to
discharge. The target energy level is displayed on the CRT screen.
The defibrillator holds the energy for 60 seconds, with the energy level
being refreshed as necessary. The last ten seconds of the hold period is
indicated by an intermittent beep tone. After the 60 second period, if the
defibrillator has not been discharged, the energy is internally dissipated
by the safety relay (XSAFREL).
IV-13