Aspen Return Monitor (A.r.m.) Calibration Check - ConMed Sabre 2400 Operators & Service Manual

Foot
Controlled
Hand Control
1
Hand Control
2
Table 4.5 Keyed Line Frequency Leakage Tests
4.5.7 Aspen Return Monitor (A.R.M.)
Calibration Check
This section describes the method to check the
calibration of the A.R.M. circuitry.
Equipment: Non-inductive Decade Resistance
Box (DRB) with attached dual foil return elec-
trode 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 connector (2 to 3 feet from
the connector) from a dual foil return electrode,
and stripping 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.
Leakage Line
Path Polarity
Active-Neutral Normal
Active-Neutral Normal
Active-Neutral Reversed
Active-Neutral Reversed
Active-Neutral Normal
Active-Neutral Normal
Active-Neutral Reversed
Active-Neutral Reversed
Active-Neutral Normal
Active-Neutral Normal
Active-Neutral Reversed
Active-Neutral Reversed
Case
Ground
Closed
Open
Closed
Open
Closed
Open
Closed
Open
Closed
Open
Closed
Open
Procedure:
1. Disconnect all accessories from the Sabre 2400
front panel.
2. Power up the Sabre 2400 in the RUN
Mode. Select Dual Foil Mode and confirm that
Resistance Indicator has all 10 green bars flash-
ing, the Monitor Set Key is flashing and that the
Return Fault 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.
5. Carefully advance the DRB in 1 ohm steps
until all 10 bars of the Resistance Indicator are
flashing. Confirm that the DRB reads between
137 and 163 ohms.
R
Test
Limit
5uA
5uA
5uA
5uA
5uA
5uA
5uA
5uA
5uA
5uA
5uA
5uA
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