7
Service Manual
6
VNUS Radio Frequency Generator
During the Power On Self Test (POST), the RF Generator performs a number of internal self-tests of its
software:
• Verifies integrity of system random access memory (RAM).
• Verifies contents of program read-only memory (ROM).
• Activates all visual indicators, including the LCD screen and the backlit
Soft Key Menu
buttons
around the screen .
• Sounds Power On tone.
• Verifies operation of radiofrequency (RF) generation and measurement circuits.
• Displays a notice if POST must restore the factory default settings due to a corruption of persistent
settings, such as screen brightness or tone volume settings .
Prior to using the RF Generator, observe that the screen, lights, and audible alarms cycle .
Software Version
The RF Generator’s software release version will be displayed when the Power On Self Test is completed .
The RFG2 enters Identification Mode as shown in Figure 5 below .
RFG2 - VERSION 4.1.0
Figure 5: Identification Mode Showing Software Version
Electrical Safety Tests
The VNUS RF Generator has been thoroughly tested for isolation, leakage, and grounding integrity prior
to shipment . Should it become necessary to perform these tests, the use of the appropriate test
equipment, and knowledge of the appropriate sections of BS EN 60601-1:1990 +A1 +A2 which pertain
to these tests is mandatory . VNUS Medical Technologies assumes no responsibility for damage to the
instrument due to improper application of the tests below . If in doubt, consult the Safety Analyzer Users
Manual or VNUS Medical Technologies prior to conducting the following tests .
Electrical Safety Tests 220-240V
A special test cable from VNUS is available for these tests. Please contact VNUS Customer Service for
information on obtaining the Biomed Test Cable (TL100-119-02).
1 . Set the line voltage to 264V and set the frequency to 50Hz . DO NOT EXCEED 280V!
2 . Plug the line cord of the VNUS Generator into the leakage tester for all tests .
3 . For source leakage and isolation tests, use the Biomed Test Cable to access patient connections . Short
electrodes and thermocouple wires together for testing .
4 . For the 25A test, connect the ROD-L leads to the chassis ground lug, and to the ground pin of the
power cord .
WARNING! HIGH VOLTAGE! DO NOT TOUCH THE EQUIPMENT DURING THE ISOLATION TESTS!
Table 2: Electrical Safety Test Limits 240V
Parameter
Conditions
Passing
Input Voltage
Rated line + 10%
264V
Line Cord Resistance
N/A
< 100mΩ
25A chassis-cord gnd
10 seconds
< 100mΩ
Earth Leakage
Power Norm, GND OPEN
< 500 μA
Earth Leakage
Power Rev, GND OPEN
< 500 μA
Source Leakage, Applied Part
Power Normal, GND OPEN
< 10 μA
Source Leakage, Applied Part
Power Reversed, GND OPEN
< 10 μA
Iso Test, Applied Part
Power Normal
< 10 μA
Iso Test, Applied Part
Power Reversed
< 10 μA
Electrical Safety Tests 110-120V
1 . Use the variable autotransformer and the DVM to set the line voltage to 132V . DO NOT EXCEED 140V!
2 . Plug the line cord of the VNUS Generator into the leakage tester for all tests .
3 . For source leakage and isolation tests, use the Biomed Test Cable to access patient connections . Short
electrodes and thermocouple wires together for testing .
4 . For the 25A test, connect the ROD-L leads to the chassis ground lug, and to the ground pin of the
power cord .
WARNING! HIGH VOLTAGE! DO NOT TOUCH THE EQUIPMENT DURING THE ISOLATION TESTS!
Table 3: Electrical Safety Test Limits 120V
Parameter
Conditions
Passing
Input Voltage
Rated line + 10%
132V
Line Cord Resistance
N/A
< 100mΩ
25A chassis-cord gnd
10 seconds
< 100mΩ
Earth Leakage
Power Norm, GND OPEN
< 300 μA
Earth Leakage
Power Rev, GND OPEN
< 300 μA
Source Leakage, Applied Part
Power Normal, GND OPEN
< 10 μA
Source Leakage, Applied Part
Power Reverse, GND OPEN
< 10 μA
Iso Test , Applied Part
Power Normal
< 10 μA
Iso Test, Applied Part
Power Reversed
< 10 μA
