Testing the Generator
6-14
LigaSure Vessel Sealing Generator Service Manual
Chassis or Earth Leakage
1.
Set the DVM to AC volts (200 mV) and connect the leakage current test
circuit.
2.
Turn on the generator.
3.
Measure between the chassis and earth ground.
4.
Determine the leakage current using the conventional one microamp (µA) per
one mV.
5.
Verify under normal conditions (ground closed, normal polarity) the leakage
current is less than 100 µA. If the leakage current is greater than 100 µA, call
the Valleylab Service Center.
6.
Verify single fault conditions (ground open) the leakage current is less than or
equal to 500 µA. If the leakage current is greater than 500 µA, call the
Valleylab Service Center.
Output Receptacles Sink Current
1.
Set the DVM to AC volts (200 millivolts [mV]) and connect the leakage
current test circuit.
2.
Turn on the generator (110 or 220 Vac) and connect the end of the leakage
current test circuit to mains voltage through a 120 k
Ω
resistor.
3.
Connect the other side of the IEC leakage load to all output receptacles.
4.
Determine the leakage current using the conventional 1 microamp (µA) per
1 mV.
5.
Verify the leakage current is less than or equal to 50 µA. If the leakage current
is greater than 50 µA, call the Valleylab Service Center.
Checking High Frequency Leakage Current and Ground
Resistance
Check the high frequency leakage current and ground resistance before returning
the LigaSure generator to clinical use. Check the leakage current
•
After calibrating the generator
•
Every six months
Equipment
•
200 ohm, 250 watt, noninductive resistor
•
Current transformer
•
True RMS voltmeter (Fluke 8920 or equivalent)
•
Vessel sealing and bipolar footswitches and bipolar handswitching accessories
•
Leakage setup per IEC 60601-2-2, clause 19.101 or 19.102
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