Mallinckrodt NELLCOR NPB-4000 Service Manual page 23

3.3.4.4.2 Pneumatic Leakage
6. Press Select button on simulator until simulator displays "Pressure Source
Set Test Pressure".
7. Use Up/Down buttons on simulator to adjust for 250 mmHg.
8. Press Start Pump button on simulator. The simulator will begin to
pressurize.
Note: The current pressure in mmHg will be displayed on both the simulator and
NPB-4000/C displays.
9. Allow 15-20 seconds for pressure to stabilize.
Note: The pressure displayed on the NPB-4000/C and the simulator should be
within 5 mmHg of one another to successfully complete the test.
10. Press Stop Pump button on simulator to stop test.
11. Press and hold Heart Rate Tone Volume switch until NPB-4000/C displays
pressure of 0 mmHg.
Note: Additional NIBP tests may be performed at this time. If no further NIBP
tests are to be conducted, turn the NPB-4000/C off. Normal monitoring
operation will return the next time the monitor is turned on.
The pneumatic leakage test verifies the integrity of the pneumatic system. A
timer/stop watch is required for this test.
1. Ensure Bio-Tek simulator is in test mode. The simulator should display
"Pressure Gauge".
2. Ensure simulator is set up for internal cuff.
3. Ensure NIBP Test screen is active on NPB-4000/C.
4. Press Heart Rate Tone Volume switch on NPB-4000/C to ensure both
valves are closed.
5. Perform offset adjustment so simulator and NBP-4000/C both display a
pressure of 0 mmHg.
a. Press Contrast Adjust switch on NPB-4000/C,
b. Press Zero button on simulator,
6. Press NIBP Start/Stop switch on NPB-4000/C to activate pump. Hold NIBP
Start/Stop switch until NPB-4000/C displays pressure of approximately 250
mmHg.
Section 3: Performance Verification
3-11