ConMed ExcaliburPLUS PC - Monopolar Power Calibration (C-C)

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the mode, i.e., they vary monotonically with
power, then calibration values stored at succes-
sively higher power calibration points in a given
operational mode should increase steadily.
Although the limits applied to each value can pre-
vent disastrous numbers from being stored, the
settable ranges for some adjacent points overlap.
So it is possible for a lower power calibration
point to be set to a larger value than its higher
power neighbor. Such nonmonotonicity is
indicative of a miscalibration or possible failure in
the VBASE or WEG hardware, so calibration
under such conditions cannot be valid.
The individual variable VBase or Waveform aver-
age
voltage changes tracks the calibration value
change, i.e., if the calibration value is nonmonot-
onic, then the VBase or Waveform average volt-
age is also nonmonotonic. Adjusting the calibra-
tion value for monotonicity will also store the
correct VBase or Waveform since they cannot be
set independently.
If nonmonotonicity is detected on exit from a
Calibration mode, an Err 11.X code is displayed
where the “X” corresponds to the mode that is
nonmonotonic. See Appendix A for reference.
During run time, the VBase and Waveform aver-
age
voltages are tested for failure every 500mS or
less. failure in either of these will result in an
error code. See Appendix A.
4.6.2.4 Exiting CAL Mode
CAL Mode may be exited by turning the
POWER switch OFE This operation should only
be performed AFTER returning to the main
menu.
NOTE: If ANY of the modes in the menu are
flashing or if there was an Err 10.X or 11.X, exit-
ing CAL Mode will result in an immediate
NOVRAM FAIL (Err 3.0) alarm on powerup in
RUN mode. Complete recalibration will then be
required in order to return the unit to service.
It’s a good practice to be sure that each menu
mode shows as calibrated (not flashing) before
departing CAL or entering Diagnostics modes.
Unforeseen circuit problems which prevent a
good calibration can be troubleshot in
Diagnostics 2 mode. Simply enter CAL Mode,
and go into Diagnostics 2. After the trouble is
corrected, recalibrate the unit.
4.6.3 Output Power Calibration Procedure
The “C-C” (Monopolar Cut and Coag) and “bP”
(Bipolar) modes are used to calibrate output
power. The only equipment necessary to conduct
power calibration is an electrosurgical output
power tester having load resistances of 300, 400
or 500 ohm for Monopolar and 50, 100, or 125
ohms for bipolar and an RF rms current indicator
capable of accurate measurements from 50 to
1200 mA, or power indicator capable of accurate
measurements from 0 to 350 watts. These units
are commercially available from a number of
sources, or can be constructed using 250 watt 3%
or better noninductive resistors and a selection of
RF ammeters ranging from 150 mA to 2A full
scale for the current indicator.
After entering a Power Calibration mode with
either “A” or “P” set, the particular operational
mode to be calibrated is selected by the appropri-
ate MODE SELECT key and by the particular
mode activated. For example, points in the Coag
Spray mode are calibrated by selecting Spray with
the COAG MODE SELECT key, and then acti-
vating the unit with the Coag foot switch or hand
switch,
Each calibration point is displayed in the appro-
priate power window in terms of target RF out-
put current in amps or watts (user selectable) to
the selected load resistance option.
If the selected load resistance is other than the
rated load, the target will deliver some other
power which takes into account Excalibur Plus
PCs typical load regulation characteristics in
that mode. The actual load regulation curve for
a particular unit may vary somewhat from typical,
so the most accurate calibration is obtained when
calibration is performed using the rated load.
Bipolar is particularly sensitive to this and rated
load (50 ohms) should be used if available.