ConMed ExcaliburPLUS PC - Bipolar Power Calibration (bP)

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Since the displayed target is computed from tar-
get power and the load resistance option, satisfac-
tory calibration is possible ONLY if that option
and the actual load resistance are the same.
Before activating a newly selected point, be sure
that
the tester RF full scale current or power
range is at least as great as the displayed target
current. Bear in mind that a unit which is far out
of calibration may deliver considerably more than
the target. The most accurate current readings
will appear on the lowest RF current range which
reads on scale for target current.
Calibration of a point consists of keying the unit
and adjusting the output until the RF ammeter
(or power indicator) reads as closely as possible
to the displayed target. Since the amplifier drive
can change only in discrete steps, it may not be
possible to match the target exactly, but the set-
ting which reads closest to the target will be with-
in the specified tolerance.
After a point is calibrated, deactivate the unit.
The last drive setting used while activated will be
stored for that point. Additionally, both the wav
form and base voltage drive are sampled and
stored to detect over-power conditions.
With the unit deactivated, the Power Incre: nd
Decrease
keys are then used to select another cali-
bration point. When the highest calibration point
in a mode is displayed, the Power Increase key
will have no further effect, the same is true for
the Power Decrease key when the lowest point is
displayed. This is useful in determining when a
mode is fully calibrated.
It is only necessary to activate the unit for the
selected point to be considered calibrated. No
actual adjustment is required, but the output cur-
rent (or power) should still be measured and veri-
fied against the target value.
Although the points in a Calibration mode may
be calibrated in any order, it’s best to use a
sequence which insures that calibration is com-
plete before returning to the menu.
4.6.3.1 Monopolar Power Calibration (C-C)
This mode permits the calibration tables for Pure
Cut, Blend 1 Cut, Blend 2 Cut, Blend 3 Cut,
Standard Coag and Spray Coag to be adjusted to
set
output power to rated load as close as possible
to the displayed power in RUN mode.
Connect the output power tester to the Return
Electrode jack and one of the active RF output
jacks, depending on how one wishes to activate
the unit. Most Biomeds prefer to use the foot
switch, in which case the tester should be con-
nected to the foot switched controlled Monopolar
Accessory Jack. If possible, set the tester for the
rated load resistance, since this will yield the most
accurate calibration results. If this resistance is
not available, the Excalibur Plus PC™ may be cal-
ibrated to meet specifications using 300, 400 or
500 ohm loads.
Use a short alligator clip jumper (3"-6") to short
A4R8 (0.1 ohm, 5W resistor) before turning unit
on. Be careful not to touch other components
until A4DS1 extinguishes. This jumper is only
required for high power monopolar calibration,
but will not affect calibration if left on through-
out the entire procedure. Be sure to remove it
after calibration is completed.
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
When the “C-C” selection is in the CUT window,
set the load resistance Option in the COAG win-
dow to match the tester load resistance and select
“A” or “P” option in the bipolar window. Then
press the “STORE” Key to enter the Monopolar
Calibration Mode.
The Pure and Standard modes are selected by
default, and the lowest power points in those
modes will be displayed. Target output current is
displayed in amps to the nearest 10 mA in the
Cut and Coag power windows if “A” was selected.
Targeted output power is displayed in watts to
the nearest 1 watt in the cut and coag windows if
“P” was selected.
Using the procedures described in Section 4.6.3,
activate the unit in each of the points in all four
operational modes, making adjustments only as
required to set output current or power to match
the displayed target as closely as possible.