Datex-Ohmeda F-LM1 Technical Reference Manual page 169

26. Calibration check.
Recalibrate the NIBP measurement. Remember to set the calibration protection back on
after the calibration.
Disconnect the pressure manometer. Select Calibrations and then highlight Calibration
Check. Press the ComWheel and take down the zero offset values for both pressure
transducers, B1 and B2. The values should be within ±10 mmHg.
Connect the pressure manometer to the cuff connector and check the calibration with
pressures 100 mmHg, 200 mmHg and 260 mmHg. The zero offset value must be added to
the displayed pressure value in order to determine the real pressure.
27. Checking the watchdog timer activation pressure.
Check from the service view (modules -> NIBP) that AD0=0 ±1, when there is no pressure in
cuff. If it is not; see instructions in section 3.3.
Select Pneumatics from the NIBP module menu.
Keep the pressure manometer connected to the cuff connector. Pump up the pressure very
slowly and note the value on the manometer when you hear a signal from the loudspeaker.
The pressure at where the watchdog timer should activate with an audible signal is 11
mmHg (11...15 mmHg).
28. Checking the watchdog timer.
Select Watchdog from the NIBP module menu.
Check the watchdog timer in the adult mode. Activate the timer by highlighting Test ADULT
and then pressing the ComWheel. Check that the time beside the text "Watchdog Interval"
starts to run. Wait until you hear a signal from the loudspeaker and then check the time
again. The time from the adult test should fall within 120-140 seconds (counter stops +
beep).
Service procedures
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Document No. 8000060-1