Philips M3001A Service Manual page 168

Preventive Maintenance Tests
Noise Check
Step 1
Step 2
Step 3
Step 4
CO
After switching the Measurement Extension on, wait at least 20 minutes before checking the
calibration.
Check the calibration of the CO
Step 1
Step 2
Step 3
Step 4
Step 5
Step 6
Step 7
Step 8
Step 9
Step 10 Select Cal. CO
152
Check that the Monitor is in Service Mode and in the CO
Disconnect the flowmeter and connect the 5% calibration gas and flow regulator in
its place.
Open the valve to apply the 5% Calibration Gas and wait until the value is stable.
Check the Noise Index (x6) displayed next to the CO
(this indicates the level of noise on the CO
M3015A unit must be replaced.
Gas Measurement Calibration Check
2
Check that the 5% calibration gas and flow regulator are connected.
Calculate the expected measurement value in mmHg as follows:
0.05 x (ambient pressure) = value mmHg
e.g. 0.05 x 736 = 36.8 mmHg (with an ambient pressure of 736 mmHg)
Open the valve on the flow regulator to allow 5% CO
Extension. Allow the value to stabilize.
Check that the value on the instrument (measurement value on the Main Screen,
x7)) matches the calculated mmHg value ± 2.6 mmHg. If the value is outside the
tolerance, calibrate as described in Step 9 onwards.
Disconnect the 5% calibration gas and connect the 10% calibration gas.
Calculate the expected measurement value and tolerance in mmHg as follows:
0.1 x (ambient pressure) = value mmHg
±0.07 x (value mmHg) = tolerance
e.g. 0.1 x 737 mmHg = 73.7 mmHg (with an ambient pressure of 737 mmHg)
±0.07 x 73.7 mmHg = ±5.16 mmHg tolerance
Open the valve on the flow regulator to allow 10% CO
Extension. Allow the value to stabilize.
Check that the value on the instrument (x8) matches the calculated mmHg value
within the calculated tolerance. If so, the Measurement Extension is correctly
calibrated. If the value is outside the tolerance, calibrate as follows
If not already connected, connect the 5% calibration gas.
.
2
wave). If the value exceeds 3 mmHg the
2
Gas Measurement as follows:
2
window.
2
value on the M3046A display
2
gas to flow into the
2
gas to flow into the
2
Testing the Instrument