Cosman G4 Radiofrequency Generator Service Manual (SPI
11291
Rev A)
Section 16
Verify that the Peak value measured by the scope is between 44-45v peak.
If the values differ substantially from those listed above the unit must be returned to Cosman Medical for
evaluation and repair.
16.7 Off zero lockout test
Attach the 100
Ω
high power resistor to the outputs
Press the Thermal RF button, set Auto Ramp Off, then OK
Turn the Output Control knob up off minimum approximately 1/8 of a turn.
Press the ON button and verify the output will not turn on
Record Pass/Fail on the Test Traveler
If not the unit must be returned to Cosman Medical for evaluation and repair.
16.8 Display checks
Set number of active electrodes to four (4), Thermal RF, Change stagger start to 20 sec, set timer to 30
sec
Attach the 100
Ω
high power resistor to each of the outputs
Attach an oscilloscope across the load
Press the ON button and increase the output until the oscilloscope reads 10v RMS (14.1v peak)
Move the scope to each output after it is enabled
Verify that the generator RF Volts display reads 9.0-11.0v
Verify that the RF watts display is between .9 and 1.1w
Restart the output and increase the output until the RF volts display is 20v
Verify that the RMS current display is between 180 and 220mA for each active electrode
Change the stagger start to 30 sec and restart the output
Increase the output until the scope reads 50v RMS
Verify that the RMS current display is between 450 and 550mA for each output when it activates
Verify that the RF watts display is between 22.5 and 27.5 for each output when it activates
Record Pass/Fail on the Test Traveler for RF Current, and Watts display
If the values differ substantially from those listed above the unit must be returned to Cosman Medical for
evaluation and repair.
16.9 Lesion timer test
Press the Time button to set to 30 seconds
Set the Output Control knob to minimum
Press the ON button and increase the output to mid setting
Verify that when the timer get to 30 seconds the output goes from on to off
Record Pass/Fail on the Test Traveler
If not the unit must be returned to Cosman Medical for evaluation and repair.
16.10 Automatic temperature control
Attach a test plug to each of the generator outputs (version without TVS)
Set the number of active electrodes to four (4)
Set the Temperature control to 60, Auto Ramp ON
Rotate the Control knob to minimum
Press the ON button
Verify that the output will ramp up to approximately 8v and then automatically reduce in order to hold the
temperature at the Set Temp value
Set the Temperature control to 90
Содержание G4
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