Philips Avalon FM20, Service Manual

Page: 84 / 260

7 Testing and Maintenance
84
4
Raise the pressure to 280 mmHg with the manometer pump.
5
Wait 10 seconds for the measurement to stabilize.
6 Compare the manometer values with the displayed values.
7
Document the value displayed by the monitor (X1).
8
If the difference between the manometer and displayed values is greater than 3 mmHg, calibrate
the noninvasive blood pressure measurement. If not, proceed to the leakage test.
9
To calibrate the noninvasive blood pressure measurement, select
CloseValves
Off then
Calibrate
NBP
and wait for the instrument to pump up the expansion chamber. Wait a few seconds after
pumping stops until
EnterPrVal
is highlighted and then move the cursor to the value shown on the
manometer. If one of the following prompt messages appears during this step, check whether
there is leakage in the setup:
– NBP unable to calibrate–cannot adjust pressure
– NBP unable to calibrate–unstable signal
10
Press
Confirm
.
If the INOP
NBP Equip Malf
message occurs in Monitoring Mode, go back to Service Mode and repeat
the calibration procedure.
Leakage Test
The noninvasive blood pressure leakage test checks the integrity of the system and of the valve. It is
required once every two years and when you repair the monitor or replace parts.
1
If you have calibrated, repeat steps 2 to 6 from the accuracy test procedure so that you have
280 mmHg pressure on the expansion chamber.
2
Watch the pressure value for 60 seconds.
3
Calculate and document the leakage test value (X2). X2 = P1 - P2 where P1 is the pressure at the
beginning of the leakage test, and P2 is the pressure displayed after 60 seconds. The leakage test
value should be less than 6 mmHg.
Linearity Test
1
Reduce the manometer pressure to 150 mmHg.
2
Wait 10 seconds for the measurement to stabilize.
3 After these 10 seconds, compare the manometer value with the displayed value.
4
Document the value displayed by the monitor (X3)
5
If the difference is greater than 3 mmHg, calibrate the noninvasive blood pressure measurement
(see steps 9 to 10 in the accuracy test procedure).
Valve Test
1
Raise the pressure again to 280 mmHg.
2 Select
CloseValves: Off
.
3 Wait five seconds and then document the value displayed. The value should be less than 10 mmHg.
4
Document the value displayed by the monitor (X4).