Pacer/Defibrillator Control Signals - ZOLL M Series Service Manual

M Series Service Manual
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 damped sinusoidal waveform and 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:
A V
NALOG OLTAGE
VCAP
VMON
VSENS
VCTL
4-10
O C
PERATION
Analog voltage spanning 0 - Used by the defib charging
2.5 V for 0 - 5000V capacitor controller.
voltage.
Analog voltage spanning 0 - Used by the defib monitor.
2.5 V for 0 - 5000V capacitor
voltage.
Pace duty cycle voltage, When multiplied by the
scaled as 0 - 2.5 V for 0 - pulse width (as read from
100% duty cycle. PW_READ) battery
voltage is proportional to
the actual pace current.
Analog control voltage scaled Only active in pace mode.
0 - 2.5 V for pace current of 0
- 140 ma.
OMMENT
9650-0450-01 Rev. U