4-6
3) Confirm cut power is set to 0, then activate
and confirm capacitance is between 0.6 and
0.9 nF.
4) Do not activate for this bipolar test. Move
test leads to Bipolar Output Accessory
Receptacles. Confirm capacitance is between
2.2 and 2.5 nF.
4.6 System Calibration
The System 2450 is calibrated during manufacture
using equipment traceable to National Institute
of Standards & Technology (NIST) standards
and should retain its accuracy for a long period of
time. Recalibrate the generator after repair or if it
performs out of specification. Check the calibra-
tion in normal operating mode and only perform
calibration if errors are identified.
The System 2450 stores its calibration in nonvola-
tile semiconductor memory, so the calibration will
be retained without any action on the part of the
user or maintenance staff. Calibration should be
checked in normal operating mode during annual
preventative maintenance to ensure there is no
change.
Calibration is required when:
• “Err 138”, “Err 139”, or “Err 140” occurs:
An error is detected with the stored calibra-
tion values.
• “Err 143” or “Err 321” occurs: One or more
modes require calibration.
• “Err 135” occurs: An error is detected with
stored ARM calibration values.
• Either the Control/Display Board assembly
(Conmed P/N 61-6991) or the Power Board
assembly (Conmed P/N 61-6981) is replaced.
• Calibration differences are found during pre-
ventative maintenance.
Refer to Figure 4.1 for calibration process flow.
4.6.1 Calibration Preliminaries
System 2450 calibration occurs in Calibration
Operating Mode, which is entered by setting
the system configuration DIP switches on the
Control/Display Board. Set the Calibration sys-
tem configuration DIP switch (Control/Display
Board SW2.2) to the ON (UP) position and the
Test system configuration DIP switch (Control/
Display Board SW2.1) to the OFF (DOWN)
position. Other configuration DIP switch settings
positions will not affect this. See Section 4.8 for
system configuration DIP switch details.
With this configuration set, turn on power while
pressing and holding both Bipolar Mode Select
Keys. Release these Keys when CAL appears in
the Monopolar Cut Power Digital Display and
the software revision appears in the Monopolar
Coag Power Digital Display. CAL and the soft-
ware revision may persist in the displays for a few
seconds after the Bipolar Mode Select Keys are
released. The display will then provide an indica-
tion of the calibration status:
• “ALL” will appear in the Monopolar Cut
Power Digital Display if the calibration mem-
ory is empty.
• “nEr” will appear in the Monopolar Cut
Power Digital Display, where “n” indicates
how many major modes require calibration,
will be displayed if only particular modes
require calibration. All of the minor mode
indicators will be illuminated and the minor
modes needing calibration will flash.
• “[U”, “[0A”, “bP”, or “Pad” will appear in
the Monopolar Cut Power Digital Display to
indicate the major mode when only minor
modes under that major mode require calibra-
tion. All of the minor mode indicators will
be illuminated and the minor modes needing
calibration will flash.
• “[U” will appear in the Monopolar Cut Power
Digital Display with the Pure Cut Mode
Indicator illuminated if all modes are cali-
brated.
For all except the last of these, a single Press and
release of the Tone Loudness Adjustment Down
Key is required to proceed past this point on the
menu. After pressing this key, “[U” will appear in
the Monopolar Cut Power Digital Display with
the Pure Cut Mode Indicator illuminated.
4.6.2 Selecting the Mode to Calibrate
Press the Monopolar Cut Power Adjustment Keys
to select the major mode to calibrate as displayed
in the Monopolar Cut Power Digital Display. The
selections are “[U” for Cut, “[0A” for Coag, “Bp”
for Bipolar, or “PAd” for the Dispersive Electrode
A.R.M. connection. If any of the minor modes
under these major modes are not calibrated, the
displayed major mode will flash.
Select the monopolar minor mode by pressing the
appropriate Mode Select Key.
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