Philips M3000A, Service Manual

Page: 164 / 293

Preventive Maintenance Tests
148 Testing the Instrument
NBP Linearity Test
Step 1 Reduce the manometer pressure to 150 mmHg.
Step 2 Wait 10 seconds for the measurement to stabilize.
Step 3 After these 10 seconds, compare the manometer value with the displayed value.
Step 4 Document the value displayed by the M3046A (x3)
Step 5 If the difference is greater than 3 mmHg, calibrate the Server (see steps 10 to 12 in
the Accuracy Test procedure).
Valve Test
Step 1 Raise the pressure again to 280 mmHg.
Step 2 Select “Close valves: Off”.
Step 3 Wait 5 seconds then document the value displayed. The value should be less than 10
mmHg.
Step 4 Document the value displayed by the M3046A (x4).
Sidestream CO
2
Performance Test
NOTE 1. Allow 5 seconds between individual service procedures in order to ensure stable
equipment conditions.
2. When certain Monitor procedures are running (for example, AutoZero or purging), service
procedures are not possible and trying to start them will result in a message “Service
Operation Failed” in the status line on the Monitor. Wait until the Monitor has completed the
current operation, then restart the service procedure.
Test Expected test results What to record on the
Service record
Accuracy test x1 = value displayed by M3046A
Difference
≤
3mmHg
Leakage test x2 = leakage test value
x2 < 6 mmHg
Linearity test x3 = value displayed by M3046A
Difference
≤
3mmHg
Valve Test x4 = value < 10 mmHg PN:P/x1/x2/x3/x4
or
PN:F/x1/x2/x3/x4
where P = Pass and F = Fail