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removing switching cards, or making internal changes, such as installing or removing jumpers,
Do not touch any object that could provide a current path to the common side of the circuit
under test or power line (eatth) ground, Always make measurements with dry hands while
standing on a dry, insulated surface capable of withstanding the voltage being measured.
The instrument and accessories must be used in accordance with its specifications and op-
erating instructions
or
the safety of the equipment may be impaired.
Do not
exceed the maximum
signal levels of the instmments and accessories, .as defined
in
the specifications and operating infonnation, and as shown on the instrument or test fixture
panels, or switching carcl.
When fuses are used in a product, replace with same type and rating for continued protection
against fire hazard.
Chassis connections must only be used as shield connections for measuring circuits,
Nar
as
safety earth ground connections.
If you are using a test fixture, keep the lid closed while power is applied to the device under
test. Safe operation requires the use of
a
lid interlock.
lf
a
@
screw is present, connect it
to
safety earth ground using the wire recommended in
the user documentation.
TI1e
.&
symbol on an instrument indicates that the user should refer to the operating in-
structions located in the manual.
The&, symbol on an instrnment shows that it cm1 source or measure
1000
volts or more, in-
cluding the combined effect ofnonnal m1d common mode voltages. Use stm1dard safety precau-
tions to avoid personal contact with these voltages.
TI1c WARNING heading in a manual explains dangers that might result in personal injury or
death. Always read the associated infonnation very carefully before performing the indicated
procedure.
The CAUTION heading in a manual explains hazard'! that could damage the instrument.
Such damage may invalidate the warranty.
lnstn.nnentatiou and accessories shall not be connected to humans.
Before performing any maintenance, disconnect the line cord and all test cables.
To maintain protection from electric shock and fire, replacement components in mains cir-
cuits, including the power transfonner, 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 01iginal component. (Note
that selected parts should be purchased only through Keithley Instruments to maintain accu-
racy and functiona1ity of the product.) 1f you are unsure about the applicability of a replace-
ment component, call a Keithley Instruments office for infonnation.
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 t6 the instrument or allow liquids to
enter or spill on the instrument. Products that consist of a circuit board with no case or chas-
sis (e.g., data acquisition board for installation into a computer) should never require clean-
ing if handled according to instructions, If the board becomes contaminated and operation
is affected, the board should be returned to the factory for proper cleaning/servicing.
Rev. 2/99
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