Testing the Generator
6-12
LigaSure Vessel Sealing Generator Service Manual
Equipment
•
Valleylab smart connector adapter (P/N LS 0500) required to confirm RF
output
•
Valleylab bipolar forceps cord (E0509)
•
Current transformer, Pearson 411
•
True RMS voltmeter (such as the Fluke 8920 or equivalent)
•
10, 100, 200, 500, and 1000 ohm 1% noninductive power resistors
•
Bipolar footswitch
Checking the Vessel Sealing Output
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 output impossible. The seal mode uses the same
output circuit and sense circuits as the bipolar mode; therefore, a positive check
on the bipolar output also confirms the seal output.
Checking the Bipolar Output
1.
Verify that the generator successfully completes the self-test as described in
Testing the Generator
.
2.
Establish the communications link as described in
Using the RS-232 Serial
Port
in this chapter.
3.
Connect the test equipment for bipolar output.
a.
Connect the smart connector adapter to the bipolar instrument receptacle.
With the adapter connected, the RS-232 port reads an E4 code.
b.
Connect the bipolar forceps cord to the adapter.
c.
Pass one lead of the cord through the current transformer and connect the
current transformer to the voltmeter.
d.
Connect the 100 ohm power resistor across the end of the cord.
e.
Connect the bipolar footswitch to the bipolar footswitch receptacle on the
rear panel.
4.
Press the bipolar up button (
Δ
) and set the power to 50 watts.
5.
Test the output current for the selected bipolar mode.
a.
Press the footswitch pedal and, while activating the generator, note the
output on the voltmeter.
b.
Release the footswitch pedal.
c.
Based on the voltmeter setting and the current transformer you are using,
calculate and record the output current.
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