Cosman G4 - Temperature Variation with Cables; Impedance Variation with Cables; Impedance Range Tests; No Temperature Lock-out Test

Cosman G4 Radiofrequency Generator Service Manual (SPI 11291 Rev A)
Section 16
Press the ON button the output should increase to about 10-14v then automatically reduce in order to
hold the temperature at the Set Temp value
Press the Pulsed RF button and verify the Set Temp is set for 42
Set the Duration for 30mS
Set the Rate for 8
Set the Auto Ramp to Off
Rotate the Control knob to minimum
Press the ON button and increase the output gradually to about 15-20v
Verify that the output will ramp up to the control knob setting and then automatically reduce in order to
hold the Temperature of all the test plugs to less than 42° and the hottest test plug to within 1° of the Set
Max Temp Limit
Record Pass/Fail on the Test Traveler
If the values differ substantially from those listed above the unit must be returned to Cosman Medical for
evaluation and repair.
16.11 Temperature Variation with cables
Set the stagger start to 30 sec, timer to 30 sec, set temp to off
Attach a CB112-TC cable, CSK-TC10 electrode, and a high power 100  the output and reference jacks
of each electrode output (E1-E4).
Verify the temperature does not very by more than five degrees when the RF output is increased from
minimum to maximum
Record Pass/Fail on the Test Traveler
If the values differ substantially from those listed above the unit must be returned to Cosman Medical for
evaluation and repair.
16.12 Impedance Variation with cables
Verify the impedance display remains around 100 when the RF output is increased from minimum to
maximum
Record Pass/Fail on the Test Traveler
If not the unit must be returned to Cosman Medical for evaluation and repair.
16.13 Impedance range tests
Remove the cables from E2-E4 outputs
Set the number of active electrodes to one (1), Thermal RF mode, Auto Ramp off.
Fill in the table of impedance measurements at Minimum, Mid and at Maximum output
If the values differ substantially from those listed on the data sheet the unit must be returned to Cosman
Medical for evaluation and repair.
16.14 No Temp lock-out test
Remove the cables from the outputs
Set the number of active electrodes to one (1), Thermal RF mode, Set Temp off
Replace the CB112-TC cable and TC electrode on E1 with a CB103-R cable (No temperature
measurement)
Verify that the temperature display shows “- -“ indicating no temperature is measured
Rotate the Output Control knob to minimum
Press the ON button
Verify that the display prompts the user to acknowledge that set temp is off before the output will turn on
Press the OK button and verify that the output turns on at minimum level and the output control knob
can adjust the output level