ZOLL M Series Defibrillator Rev R - Manual (Page 135)

M Series Service Manual
125
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 NALOG V OLTAGE O PERATION C OMMENT
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.
VSENS 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.