SLE 2000 HFO, Руководство по обслуживанию

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Page 48 of 258 Issue 10 (01/10/2004)
11.6 Pressure Drift Monitor Board (A0745)
Procedure depends on which issue of board is fitted.
Issue 1
(recognisable as only having two potentiometers)
Pay special attention to the indicated polarities when measuring voltages.
a) Set the DC voltage between (High) (+) and (Low)(-) to +180mV ±5mV using RV1.
b) Set the DC voltage between (High) (+) and (Diff)(-) to +90mV ±5mV using RV2.
c) Repeat steps a) and b) until both voltages are correct to within ±5mV.
Verify that the DC voltage between (Diff)(+) and (Low)(-) is +90mV ±5mV.
Issue 2
(recognisable as only having three potentiometers)
a) Whilst monitoring the DC voltage at DIFF, vary the pressure to the proximal airway
port over the complete range (60 to -60cmH
2
0).
Adjust RV3 until the voltage measured at DIFF is the same at +60cmH
2
0 as it is at
-60cmH
2
0 to within 20mV. (DIFF should be in the region of 8V).
Pay special attention to the indicated polarities when measuring voltages.
b) Set the DC voltage between (High) (+) and (Low)(-) to +180mV ±5mV using RV1
c) Set the DC voltage between (High) (+) and (Diff)(-) to +90mV ±5mV using RV2
d) Repeat steps a) and b) until both voltages are correct to within ±5mV
Verify that the DC voltage between (Diff)(+) and (Low)(-) is +90mV ±5mV