Keithley 2657A, Quick Start Manual

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Do not connect switching cards directly to unlimited power circuits. They are intended
to be used with impedance-limited sources. NEVER connect switching cards directly to
AC mains. When connecting sources to switching cards, install protective devices to
limit fault current and voltage to the card.
Before operating an instrument, ensure that the line cord is connected to a
properly-grounded power receptacle. Inspect the connecting cables, test leads, and
jumpers for possible wear, cracks, or breaks before each use.
When installing equipment where access to the main power cord is restricted, such as
rack mounting, a separate main input power disconnect device must be provided in
close proximity to the equipment and within easy reach of the operator.
For maximum safety, do not touch the product, test cables, or any other instruments
while power is applied to the circuit under test. ALWAYS remove power from the
entire test system and discharge any capacitors before: connecting or disconnecting
cables or jumpers, installing or 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 (earth) 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
operating instructions, or the safety of the equipment may be impaired.
Do not exceed the maximum signal levels of the instruments and accessories, as defined
in the specifications and operating information, and as shown on the instrument or test
fixture panels, or switching card.
When fuses are used in a product, replace with the same type and rating for continued
protection against fire hazard.
Chassis connections must only be used as shield connections for measuring circuits,
NOT 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.
If a screw is present, connect it to safety earth ground using the wire
recommended in the user documentation.
This symbol on an instrument means caution, risk of danger. The user should refer
to the operating instructions located in the user documentation in all cases where
the symbol is marked on the instrument.
This symbol on an instrument means caution, risk of electric shock. Use standard
safety precautions to avoid personal contact with these voltages.
This symbol on an instrument shows that the surface may be hot. Avoid personal
contact to prevent burns.
This symbol indicates a connection terminal to the equipment frame.
If the mercury symbol is on a product, it indicates that mercury is present in the
display lamp. Please note that the lamp must be properly disposed of according to
federal, state, and local laws.
WARNING This heading in the user documentation explains dangers that might result
in personal injury or death. Always read the associated information very
carefully before performing the indicated procedure.
CAUTION This heading in the user documentation explains hazards that could
damage the instrument. Such damage may invalidate the warranty.
Instrumentation and accessories shall not be connected to humans.
Before performing any maintenance, disconnect the line cord and all test cables.