Keithley S500 Administrative Manual Download Page 5

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Safety Precautions

The following safety precautions should be observed before
using this product and any associated instrumentation.
Although some instruments and accessories would normally
be used with non-hazardous voltages, there are situations
where hazardous conditions may be present.
This product is intended for use by qualified personnel who
recognize shock hazards and are familiar with the safety
precautions required to avoid possible injury. Read and follow
all installation, operation, and maintenance information
carefully before using the product. Refer to the user
documentation for complete product specifications.
If the product is used in a manner not specified, the protection
provided by the product warranty may be impaired.
The types of product users are:

Responsible body

is the individual or group responsible for

the use and maintenance of equipment, for ensuring that the
equipment is operated within its specifications and operating
limits, and for ensuring that operators are adequately trained.

Operators

use the product for its intended function. They

must be trained in electrical safety procedures and proper
use of the instrument. They must be protected from electric
shock and contact with hazardous live circuits.

Maintenance personnel

perform routine procedures on the

product to keep it operating properly, for example, setting the
line voltage or replacing consumable materials. Maintenance
procedures are described in the user documentation. The
procedures explicitly state if the operator may perform them.
Otherwise, they should be performed only by service
personnel.

Service personnel

are trained to work on live circuits,

perform safe installations, and repair products. Only properly
trained service personnel may perform installation and
service procedures.
Keithley Instruments products are designed for use with
electrical signals that are rated Measurement Category I and
Measurement Category II, as described in the International
Electrotechnical Commission (IEC) Standard IEC 60664.
Most measurement, control, and data I/O signals are
Measurement Category I and must not be directly connected
to mains voltage or to voltage sources with high transient
over-voltages. Measurement Category II connections require
protection for high transient over-voltages often associated
with local AC mains connections. Assume all measurement,
control, and data I/O connections are for connection to
Category I sources unless otherwise marked or described in
the user documentation.

Exercise extreme caution when a shock hazard is present.
Lethal voltage may be present on cable connector jacks or
test fixtures. The American National Standards Institute
(ANSI) states that a shock hazard exists when voltage levels
greater than 30V RMS, 42.4V peak, or 60VDC are present. A
good safety practice is to expect that hazardous voltage is
present in any unknown circuit before measuring.
Operators of this product must be protected from electric
shock at all times. The responsible body must ensure that
operators are prevented access and/or insulated from every
connection point. In some cases, connections must be
exposed to potential human contact. Product operators in
these circumstances must be trained to protect themselves
from the risk of electric shock. If the circuit is capable of
operating at or above 1000V, no conductive part of the circuit
may be exposed.
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.