General Rack Maintenance; Multimeter Procedure - Optional - Symantec Shelf NetBackup 5220 Maintenance Manual

Parameter
Protective system
Cleanliness

General rack maintenance





Multimeter procedure - optional

You can use a multimeter to check the grounding of each rack cabinet component:
Checking resistance

Requirements
Check whether the rodent-proof net on
each signal cable outlet at the cabinet top
or bottom is tightly wrapped and in good
condition.
Check the cabinet top, bottom, front and
back and all rack air filters for cleanliness
and lack of dust.
Remove the air filter frame from the rack cabinet bottom. Wash and dry the
filter thoroughly and then place it back into the cabinet.
Remove the air filter gauze from the inner side of the cabinet's front door.
Squeeze water out of the gauze and let it dry and reinstall it.
Remove the air deflector from inside the jamb on the cabinet's front side. Use a
piece of clean cotton gauze, an anti-static brush, or a vacuum cleaner to remove
any dust or particles and reinstall it.
Set the multimeter to the resistance position and connect one lead to a fixed
place in the equipment room (you may need to extend the lead cable) and the
other lead to measure each grounding point inside the cabinet. Given the
measuring accuracy, the measured resistance of each grounding point should be
approximately 1 ohm or less. If the resistance measured at a grounding point
exceeds 1 ohm, check the grounding cable, connecting terminal and fastening
screw and make appropriate corrections.
Specifications
All rodent-proof nets should
be tightly wrapped and
undamaged.
All surfaces should be clean,
dust-free, and cleared of any
blockages or impediments.
29