ConMed sabre 180, Service Manual

Page: 52 / 72

4-2
5. Connect the other lead to the ESU terminals
listed below, one at a time.
•Either blue bipolar output jack.
•Either return electrode jack pin.
•Footswitch monopolar active jack.
•Red hand controlled active jack.
6. While monitoring the meter, check leakage cur-
rent at each terminal in all eight combinations of
mains normal/reverse, ground open/closed, unit
deactivated/activated to the measured terminal.
Test limit: 10 uA.
NOTE: If the activated leakage current exceeds
this limit, make certain that the power setting is
zero for that output before continuing.
7. Connect the meter lead to foot switch connec-
tor terminal C. Cycle the switch box through all
four ground and polarity combinations.
Repeat this test with the meter lead connected to
the foot switch connector shell.
Test limit: 80 uA.
4.2.3 Aspen Return Monitor (A.R.M.)
Calibration Check
Equipment:
Decade Resistance Box (DRB) with attached dual
foil return electrode cable. The DRB must be
adjustable from 0 to 160 ohms in 1 ohm steps
and accurate to 1%. A dual foil return electrode
cable can be made by cutting the cable and con-
nector from a dual foil return electrode, and strip-
ping the wires for connection to the DRB.
NOTE: Some DRBs may present a brief open
circuit at the output terminals during switch
movement. This may cause the A.R.M. software
to calculate an erroneously high resistance read-
ing. This effect may be minimized by making
DRB setting changes quickly. If the resistance
read during any of the following tests is above the
upper limit, repeat the test carefully stopping in
each 1 ohm step for at least 1 second.
Procedure:
1. Disconnect all accessories from the output
panel.
2. Power up in the RUN Mode. Select Dual Foil
Mode and confirm that Resistance Indicator has
all ten green bars flashing and that the Return
MONITOR Indicator is illuminated.
3. Using the test cable, connect the DRB to the
Return Electrode Jack.
4. Adjust the DRB until eight bars of the
Resistance Indicator are flashing. Confirm this
occurs with the DRB set between 115 and 160
ohms.
5. Carefully advance the DRB in 1 ohm steps
until all ten bars of the Resistance Indicator are
flashing. Confirm that the DRB reads between
137 and 163 ohms.
6. Set the DRB to 7 ohms and confirm that the
Resistance Indicator is dark and the Return
Monitor is lit.
7. Select Single Foil Mode. Confirm the Return
Monitor goes dark.
8. Increase the DRB in 1 ohm steps until an audi-
ble Return Fault Alarm is sounded and the
Return Monitor Indicator is lit. Confirm the
DRB is between 8 and 12 ohms.
9. Decrease the DRB setting in 1 ohm steps until
the Return Monitor goes dark. Confirm that the
DRB reads from 1 to 4 ohms less than the resis-
tance read in Step 8.
10. Disconnect the DRB. This completes the
A.R.M. calibration test. If any readings were only
slightly out of range, first check the DRB with an
accurate ohmmeter. If the DRB is accurate, recali-
brate the A.R.M. limits in CAL Mode. See
Section 4.3.3. If one or more readings were far
from the mark, troubleshoot the A.R.M. circuitry
before attempting recalibration. See Section
4.5.5.