ConMed 7550 - FMON Calibration; Power Calibration; Filter Calibration - Full Bridge Modes (Optional); Cut Power Calibration (Power Control Assembly - A4)

8-3
• Connect the nozzle of the ABC accessory to a
Mass Flow Meter calibrated for argon gas.
• Select the Manual Flow Mode
• Set the flow rate for 4 slpm.
• Activate the ABC mode - Adjust RA3 (F_
CAL) for a flow rate of 4 slpm
±.3 slpm.
• Set the flow rate for 8 slpm.
• Activate the ABC mode - verify the flow rate
is 8 slpm
±.5 slpm. If not, then adjust RA3
for a flow rate as near 4 slpm and 8 slpm as
possible.
8.6.4 FMON Calibration
• Connect a standard ABC accessory to the
System 7550™.
• Select Manual Flow Mode at 4 slpm.
• Activate ABC Mode - adjust RA6 (FMON)
for 2V.
8.7 Power Calibration
The power adjustments within this procedure will
specify a load and power setting for calibration.
For each power mode, the output power should
be checked at low, medium and high power set
-
tings to verify the output power tracks the dis
-
played power setting. See Figure 2.2 for informa
-
tion on connecting an analyzer to the RF outputs
for power calibration.
8.7.1 Filter Calibration - Full Bridge Modes
(Optional)
This calibration is to calibrate the bandpass fil
-
ter for the RF output modes of the Full Bridge
Amplifier.
• Disconnect the white/red striped lead from the
High Voltage Power Supply (A7) to the Full
Bridge Amplifier (A11).
• Connect the positive lead of an ammeter (rated
for and set for 10A) to the +DC terminal of
the High Voltage Power Supply connector, J2.
• Connect the negative lead of the ammeter to
the white/red striped lead that goes to the Full
Bridge Amplifier.
• Set all power controls to 0W initially.
• Adjust Pure Cut power for 2W.
• Connect a lead from the Return Electrode con
-
nector to the Footcontrol Connector. (Short
the RF Output).
• Activate Pure Cut - Adjust the power of Pure
Cut for a current reading on the ammeter of
approximately 3A.
• Adjust the lug of L2 on the RF Output
Assembly (A10) for
maximum current.
CAUTION: if using a metallic adjuster, an RF
burn may occur if contact with the adjusting
tool touches the skin. Suggest using a non-
conductive adjuster.
• Remove the short from the RF output.
• Set the ammeter for 100mA to 500mA range.
• Activate Pure Cut and adjust the power for
a reading of approximately 100mA on the
ammeter.
• Adjust L1 on the RF Output Assembly (A10)
for a
minimum current.
• Disconnect the ammeter and reconnect the
white/red striped lead from the Full Bridge
Amplifier to the High Voltage Power Supply.
8.7.2 Cut Power Calibration (Power Control
Assembly - A4)
• Connect a 500 ohm load (ESU analyzer)
between Patient Return and the Footcontrol
Jack.
• Set Pure Cut for 100W.
• Activate Pure Cut and adjust RA5 (CUT
CAL) for 100W
±2W. (This potentiometer is
at the bottom of the PCB assembly.)
8.7.3 Pinpoint Coag Calibration (Power
Control Assembly - A4)
• Connect a 500 ohm load (ESU analyzer)
between Patient Return and the Footcontrol
Jack.
• Set Pinpoint Coag for 100W.
• Activate Pinpoint Coag and adjust RA7
(COAG CAL) for 100W
±2W.
8.7.4 Spray Coag Calibration (Power
Control Assembly - A4)
• Connect a 500 ohm load (ESU analyzer)
between Patient Return and the Footcontrol
Jack.
• Set Spray Coag for 70W.
• Activate Spray Coag and adjust RA3 (SPRAY
ADJ) for 70W
±2W.