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•
Use an automatic electrical safety tester to make the measurements.
•
All tests must be performed in accordance with class II type BF (IEC 60601-1).
2.10.1
Preparations
Supply Voltage Reading
Note the power voltage reading.
The voltage must be noted at each service check, as the currents measured are directly
in relation to the supply voltage. This allows all measurements made on the same venti-
lator to be compared with measurements made on different occasions.
2.10.2
Insulation Check
The insulation resistance is measured using a 500 V DC power supply. The most suit-
able method is to connect the plus lead to the two ventilator power socket pins, and the
minus lead to the casing or the patient air connector. The measurements made during
the delivery inspection can be used as reference values for measurements made during
future services. If no reference values are available, the value for the insulation resistance
should be
≥
70 MW .
2.10.3
Leakage Currents Check
NOTE
The leakage current check is optional.
The leakage current check is not necessary to ensure safe use of the Vivo.
The leakage currents are measured at different parts of the ventilator using an RC circuit
to earth.
Make the measurements partly at normal case (NC) and at the single fault condition
(SFC). Reverse the polarity of the power supply and note the highest value.
Leakage currents to earth must not exceed the stated limit values.
2.10.3.1
Leakage Currents from the Casing
The leakage current of the casing is measured at an unpainted point, for example, the
head of a screw.
Limit values:
•
NC <0.1 mA
•
SFC <0.5 mA
Break neutral for SFC.
2.10.3.2
Patient Leakage Currents
The patient leakage current is measured between the patient connector and earth.
Doc. 007132 D-2
Vivo 45/Nippy 4 Series Service manual
Summary of Contents for Nippy 4 Series
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