(7) Go back to 60bpm. Turn the Hi limit set ON with the pointer facing
240bpm. Switch to 240bpm. After a few seconds, the alarm triggers, indicated by a loud
continuous tone from the beeper.
(8) Verify that the pointer of the knob is facing the number 240 on the front
panel; loosen and reposition if necessary.
(9) Now switch the input signal to 30bpm. After a few seconds, the unit goes
out of alarm. Turn the Lo limit set on and advance clockwise until the pointer faces 30bpm.
After stabilization, the alarm should sound.
(10) Verify that the pointer knob faces the number 30 on the panel.
(11) Switch the input signal to 60bpm. No alarm condition should be registered
once the read-out reaches that figure.
j. Adjust the Chart Recorder Timer. Refer to Appendix B, Monitor Board Analog
Schematic, section E-7.
Switch the chart recorder mode selector to the AUTO position.
(2) Create a Hi or Lo heart rate alarm condition by adjusting the repetition rate
of the ECG simulator connected to the patient cable input.
(3) The chart recorder should start as soon as the beeper signals an alarm
condition. It should keep running for 15 seconds even if the alarm condition disappears
before that interval and the signal displayed will be in the delayed mode.
(4) The running time can be adjusted with R176 (one-turn control). With the
chart recorder mode selector in the same position, connect the defibrillator and turn it on
and charge up (any energy level). In the same instant the defibrillator is fired, the chart
recorder starts running again for 15 seconds. The same action can be simulated by
introducing a 12v positive-going pulse into pin 8 of J4, which is the defibrillator fire pulse
input to the monitor.
This concludes the check and calibration procedure for the grounded analog
section of the Porta Pak 90 monitor.