SLE SLE2000 HFO, Service Manual, Page: 66 / 84

SLE2000 HFO Service Manual
Doc No. SM/0001: Issue 7.0
Page 66 of 84
6.2.3.5 Airway Trigger Calibration
Set up the ventilator electrically and pneumatically and fit a standard patient circuit with a 2ml syringe
fitted to the ET manifold.
6.2.3.5.1 Post de-energisation delay
With a dual beam oscilloscope, connect channel 1 to U200/2 (inverted), channel 2 to U200/4. Timebase
100ms/cm, sensitivity 2V/div.
Set ventilator to CMV Mode, 60BPM, 0.5sec insp. time.
This will produce 2 positive going waveforms. Adjust RV200 so that the interval between the 2 positive
going edges is 200ms±10ms.
6.2.3.5.2 Sensitivity preset adjustment
Switch ventilator into CMV mode. Adjust to 1BPM rate and insp. time of 0.5 secs. Set respiratory
pressures of 30/0cmH
2
O. Set High and CPAP alarms to 35 and -5 cmH
2
O respectively. Turn PTV
sensitivity control fully clockwise. Switch ventilator into PTV mode and slowly draw 2ml of air from the
tracheal port at an approximate rate of 2ml per 1/2 second repeatedly.
Starting with RV202 in the fully clockwise position, adjust gradually anticlockwise until ventilator triggers
reliably at this degree of inspiratory effort.
6.2.3.5.3 PTV sensitivity control verification
Replace 2ml syringe with 50ml syringe. Turn PTV sensitivity control fully anticlockwise. Slowly draw
10ml of air from the tracheal port at an approximate rate of 10ml per 1/2 second. Ensure that the
ventilator triggers reliably at this degree of inspiratory effort.
Presets RV7, RV8 and RV9 should not be present on this board since these are for CPAP, Cycle Fail and
High pressure limits and are now monitored by the HFO CPU PCB (A0736/01).
6.2.4 M
OTOR
D
RIVE
B
OARD
(A0739/01)
Switch HFO mode to EXP.
Turn motor speed control fully clockwise.
Monitor TP1 with a calibrated oscilloscope or calibrated timer/counter.
Adjust RV1 to produce a frequency of:........................ 4KHz±40Hz (250
µ
s±25
µ
s)