ConMed ExcaliburPLUS PC - ARM Calibration (PAd)

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Zero power points should be calibrated by setting
the tester to the most sensitive range, then raising
output until there is readable output. Find the
output setting which yields the smallest percepti-
ble output change between activated and deacti-
vated conditions; the correct calibration setting
for zero power is one step below that one.
Because heating tends to change the gain of the
power amplifier slightly, a slow change in load
current may be noted while the unit is activated.
This may cause the unit to appear slightly off
when calibration is rechecked in Run after cooling
down. These errors may be minimized by allow-
ing the unit to cool for 15 to 20 seconds between
activations. Coag power calibration is affected by
heating to a much smaller extent than is Cut.
This phenomenon is not ordinarily a problem
unless the unit is far out of calibration, requiring
extended activations in order to bring it in. In
such cases, first perform a complete rough cali-
bration. After the unit has cooled for several
minutes after the last activation, repeat the cali-
bration. Now the activation time necessary to
close in on final adjustments will be very brief.
When all points have been calibrated satisfactorily,
pressing the “STORE” key will store the updated
values and restore the menu.
4.6.3.2 Bipolar Power Calibration (bP)
This mode permits the calibration tables for
Bipolar Coag and Bipolar Cut to be adjusted to
set output power to 50 ohms as close as possible
to the displayed power in RUN mode.
Connect the output power tester to the Bipolar
RF output jacks. If possible, set the tester for a
50 ohm load resistance, since this will yield the
most accurate calibration results. If this resistance
is not available, the Excalibur Plus PC™ may be
calibrated using 100 or 125 ohm loads, however
the accuracy will be degraded.
Connect the power plug to a source of AC power
of the same frequency and within 5% of the volt-
age specified on the nameplate. Enter CAL,
Mode as described above.
4-16 [=
Select “bP” in the CUT window, set load resis-
tance Option in the COAG window to match the
tester load resistance and select “A” or “P” option
in the bipolar windows. Then press the
“STORE” Key to enter the Bipolar Calibration
Mode.
Coag will be selected by default. Target output
current is displayed in amps to the nearest 10 mA
in the Bipolar power window if “A” was selected.
Target output power is displayed in watts to the
nearest 1 watt in the CUT and COAG windows if
“P” was selected. For target current, the decimal
point is NOT displayed, but is effectively located
at the left side of the two digit Bipolar power dis-
play. Thus a display of “99” should be read as
“0.99” amps.
Using the general procedures described in Section
4.6.3 above, activate the unit in each of the
points in both operational modes, making adjust-
ments as required to set output to the displayed
target as closely as possible.
When all points have been calibrated satisfactorily,
pressing the “STORE” Key will store the updated
values and restore the menu.
4.6.4 A.R.M. Calibration (PAd)
This mode calibrates the A.R.M. circuitry to
Return Electrode resistances of 10 and 150 ohms.
The only equipment required to complete
A.R.M. Calibration are 10 and 150 ohm resis-
tances accurate to 5% or better. Power ratings
are unimportant, but wirewound resistors should
not be used. A means to connect the resistance
between both pins of either of the Return
Electrode jacks is also required.
While at the menu level in CAL Mode, select PAd
in the Cut window and press the “STORE” key.
The Coag window will display the value in ohms
of the resistance to be calibrated, and the ASSIST
Resistance Indicator will be lit with a correspond-
ing number of bars. A flashing ASSIST
Resistance Indicator denotes an uncalibrated
point.
Connect the selected resistance to the Return
Electrode jack. Wait a second or two, then press
the Alarm Set Point key to store the calibration
value.