Periodic Safety Check
Setup, Tests, and Adjustments
LigaSure Vessel Sealing Generator Service Manual 6-5
Periodic Safety Check
Perform the following safety checks every six months to verify that the generator
is functioning properly. Record the test results for reference in future tests. If the
generator fails to meet any of the checks, refer to Chapter 7, Troubleshooting.
Here is a summary of safety checks:
• Inspect the generator and accessories
• Inspect the internal components
• Test the generator
• Confirm outputs
• Check leakage current and ground resistance
Recommended Test Equipment
• Digital voltmeter—Fluke 77 or 87, or equivalent
• True RMS voltmeter—Fluke 8920, or equivalent
• Oscilloscope—Tektronix 2445, or equivalent
• Leakage current tester—Use UL load device or commercially available
leakage tester
• Leakage table—per IEC 60601-2-2, Figure 104
• 5, 10, 100, 200, 400, and 1K ohm, all 250 watt, 1% tolerance, noninductive
power resistors (Dale NH-250 or equivalent)
Warning
Electric Shock Hazard When taking measurements or troubleshooting the
generator, take appropriate precautions, such as using isolated tools and
equipment, using the “one hand rule,” etc.
Electric Shock Hazard Do not touch any exposed wiring or conductive surfaces
while the generator is disassembled and energized. Never wear a grounding
strap when working on an energized generator.
Caution
The generator contains electrostatic-sensitive components. When repairing the
generator, work at a static-control workstation. Wear a grounding strap when
handling electrostatic-sensitive components, except when working on an
energized generator. Handle circuit boards by their nonconducting edges. Use an
antistatic container for transport of electrostatic-sensitive components and circuit
boards.
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