Cosman G4 Radiofrequency Generator Service Manual (SPI
11291
Rev A)
Section 16
Using a stylist (pointer) set the screen calibration (be sure to select as close to the center of the cross-
hair as possible
Set the time date and day using the up down on screen buttons
Adjust the Output Volume setting by selecting each of the available settings.
Adjust P5 on the Backplane PC board (11070) so that the speaker is not over driven when the Output
volume is set to high and is just audible when set to Low.
Set the default settings to: Output Volume Low, Language English and then the Main menu.
The screen will change to the Main Menu screen.
Record Pass Fail on the traveler for touch screen display test
Turn the power off
Connect a Resistance Substituter set for 100
Ω
across the patient outputs (E1)
Connect the oscilloscope across the 100
Ω
load
Verify that the output is a clean undistorted 480kHz sign wave
Record Pass Fail on the traveler for RF Output Waveform
16.4 Temperature Display calibration check
Plug a room temperature test plug into each output jack (four total)
Verify that they all read the same room temperature /-2°
Remove the test plugs and plug a CB112-TC cable and CSK-TC electrode into output jack 1
Place the tip of the electrode into the 40° water bath with the Omega temp meter
Verify that both read /-3°C of each other
Place the tip of the electrode into the 90° water bath with the Omega temp meter
Verify that both read /-3°C of each other
Repeat for electrode output jacks 2 through 4
If the values differ substantially from those listed above the unit must be returned to Cosman Medical for
evaluation and repair.
16.5 High volts measurement calibration
Select Electrode Setup, 1 Active Electrodes, then Thermal RF, Auto Ramp off
Attach the 100
Ω
load to the E1 patient output and Reference
Attach an Oscilloscope across the 100
Ω
load.
Make sure the Output control knob is fully CCW to minimum
Press the Start button and increase the output until the scope reads approximately 50v RMS. The LCD
display should display 50v
Check the LCD displayed values relative to the RMS values measured by the scope at minimum, 10, 30,
50 and Max.
All value must be within 10%.
Press the off button
Record Pass Fail on the data sheet for RF volts calibration.
If the values differ substantially from those listed above the unit must be returned to Cosman Medical for
evaluation and repair.
16.6 Peak voltage display calibration
Select Pulsed RF, Change (settings), Auto Ramp Off, then OK
Attach the 100
Ω
load to the E1 patient output and Reference
Attach an Oscilloscope across the 100
Ω
load.
Make sure the Output control knob is fully CCW to minimum
Press the Start button and increase the output until the LCD display reads approximately 45v peak.
Summary of Contents for G4
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