4
To maintain protection from electric shock and fire, replace-
ment components in mains circuits, including the power trans-
former, test leads, and input jacks, must be purchased from
Keithley Instruments. Standard fuses, with applicable national
safety approvals, may be used if the rating and type are the
same. Other components that are not safety related may be pur-
chased from other suppliers as long as they are equivalent to the
original component. (Note that selected parts should be pur-
chased only through Keithley Instruments to maintain accuracy
and functionality of the product.) If you are unsure about the
applicability of a replacement component, call a Keithley In-
struments office for information.
To clean an instrument, use a damp cloth or mild, water
based cleaner. Clean the exterior of the instrument only. Do
not apply cleaner directly to the instrument or allow liquids
to enter or spill on the instrument. Products that consist of a
circuit board with no case or chassis (e.g., data acquisition
board for installation into a computer) should never require
cleaning if handled according to instructions. If the board be-
comes contaminated and operation is affected, the board
should be returned to the factory for proper cleaning/servic-
ing.
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