Testing the Generator
Setup, Tests, and Adjustments
LigaSure Vessel Sealing Generator Service Manual 6-15
Checking Seal High Frequency Leakage Current
The LigaSure vessel sealing mode uses a proprietary algorithm that varies the
output based on the progress of the sealing action. This algorithm makes a
conventional measurement of the RF leakage impossible. The vessel sealing
mode uses the same output circuit and sense circuits as the bipolar mode;
therefore, a positive check on the bipolar RF leakage also confirms the vessel
sealing RF leakage.
Checking Macrobipolar and Bipolar High Frequency Leakage Current
1. Remove the vessel sealing accessories.
2. Connect the 200 ohm load from one side of the bipolar output through the
current transformer to the equipotential ground lug on the rear of the
generator.
3. Connect the current transformer to the true RMS voltmeter.
4. Connect a bipolar footswitch to the bipolar footswitch receptacle on the rear
panel.
5. Activate the footswitch in each mode (macrobipolar and bipolar) at the
maximum control setting. Record the leakage current. It should not exceed
69 mA for any mode.
6. If the high frequency leakage exceeds 69 mA, call the Valleylab Service
Center for further instructions.
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