Datex-Ohmeda 7900 - Page 79

4/Tests and Troubleshooting
1503-0151-000 5/26/0 4-33
Remarks
The calibration is performed as follows:
1. Open the flow valve to the starting point that was found (where
manifold pressure is 91-92 cm H
2
O).
2. Wait for the flow to stabilize.
3. Once the flow stabilized, set the flow to 12 L/min.
4. Wait for the flow to stabilize.
5. Perform steps 1-6 replacing step 3 with 11 L/min., 10 L/min., 9 L/min.
1 L/min..
Therefore, there are 12 points that are calculated for the bleed resistor calibration.
Calibration points may be greater than the listed cm H
2
O, but if any one of these
points is less than the cmH
2
O listed below, calibration fails. If the calibration pass-
es, the calculated bleed resistor calibration points are stored in EEPROM.
67 cm H
2
0
59 cm H
2
0
52 cm H
2
0
45 cm H
2
0
38 cm H
2
0
30 cm H
2
0
24 cm H
2
0
18 cm H
2
0
12 cm H
2
0
7 cm H
2
0
-5 cm H
2
0
-5 cm H
2
0