ZOLL E Series Monitor Defibrillator Rev D - Manual (Page 105)

E Series Service Manual
9650-1450-01 Rev. D 4-9
The patient relay discharges via the signal PATREL_DRV generated by XPATREL and Q304, Q323, and Q322. PATREL_DRV is disabled when
XPACE_SEL is at a logic low.
When the patient relay activation completes, the Main System Board releases the XPATREL signal. Several hundred milliseconds later, the safety relay
closes to ensure the high voltage capacitor energy is completely dissipated.
The Pacer circuit produces and delivers user-controllable pace pulses to the pacing electrodes. To initiate pacing, the front panel switch is turned to
PACER and the OUTPUT and RATE controls are set. Pacing current amplitude is constant during the pulse and is determined by the position of the front
panel PACER OUTPUT dial. Pacing pulse rate is determined by the position of the front panel PACER RATE dial. The pacing pulse duration is fixed at 40
milliseconds.
Pacer/Defibrillator Control Signals
The Pacer/Defibrillator Control charges the high voltage capacitor to a voltage requested by the main system board in response to user energy selections.
It delivers defibrillator energy to the patient through the patient connector to the paddles and pacer electrodes or multi-function electrodes (PADS). This
control also generates pacing pulses at rates and amplitudes requested by the main system board in response to user selections, controls biphasic waveform
defibrillation, and measures pace current and high voltage capacitor voltage by two independent channels.
The following signals control the operation of the Pacer/Defibrillator subsystem:
Analog Voltage Operation Comment
VCAP Analog voltage spanning 0 - 2.5 V for 0 - 5000V capacitor voltage. Used by the defib charging controller.
VMON Analog voltage spanning 0 - 2.5 V for 0 - 5000V capacitor voltage. Used by the defib monitor.
VSNS Pace duty cycle voltage, scaled as 0 - 2.5 V for 0 - 100% duty cycle. When multiplied by the pulse width (as read from PW_READ)
battery voltage is proportional to the actual pace current.
VCTL Analog control voltage scaled 0 - 2.5 V for pace current of 0 - 140 ma. Only active in pace mode.
FET_MON Analog voltage monitors the condition of the discharge transistors. Provides a signature voltage in case of a fault.
PAT_CUR Bound on the range of 0 - 2.5 V and accommodates defib currents of -
50 to +100 A Analog signal representing the patient current during a defib
discharge.