Installation
P/N 06-237041-001 2-33 February 2011
2-8.5.3 MEASURING CLASS-B SLC WIRING RESISTANCE
Note: The following methods for measuring SLC wiring resistance and capacitance apply to SLC
circuits located on the Main Controller Board and/or the SLC Expansion Card.
The total wiring resistance from the control unit to the end of each individual branch line cannot
exceed 40 ohms. Use the following procedure to determine the wiring resistance.
1. Short the ends of each branch line one at a time. Measure the resistance from the terminating
points at the control unit to the end of the branch line. Refer to Figure 2-26.
2. Remove the shorting jumper after each branch-line resistance measurement.
Figure 2-26. Measuring CLASS-B SLC Wiring Resistance
2-8.5.4 MEASURING CLASS-B SLC WIRING CAPACITANCE
The total wiring capacitance cannot exceed 0.5 F. Use the following procedure to determine the
wiring capacitance.
1. Ensure that the ends of each branch line are open circuited.
2. Measure the capacitance from the terminating points at the control unit using a capacitance
meter. Refer to Figure 2-27.
Figure 2-27. Measuring CLASS-B SLC Wiring Capacitance
Jumper
Branch 1
Branch2
Branch3
BranchN
Volt-Ohm Meter
Branch 1
Branch2
Branch3
BranchN
Capacitance Meter
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