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 situa-
tions 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 possi-
ble injury.
Read the operating information carefully before using the product.
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.
As described in the International Electrotechnical Commission (IEC)
Standard IEC 664, digital multimeter measuring circuits (e.g., Keithley Models 175A,
199, 2000, 2001, 2002, and 2010) measuring circuits are Installation Category II. All
other instruments’ signal terminals are Installation Category I and must not be con-
nected to mains.
Before operating an instrument, make sure 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.
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 dis-
connecting 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 measure-
ments with dry hands while standing on a dry, insulated surface capable of with-
standing the voltage being measured.
The
symbol on an instrument indicates that the user should refer to
the operating instructions located in the manual.
The
symbol on an instrument shows that it can source or measure
1000 volts or more, including the combined effect of normal and common mode
voltages. Use standard safety precautions to avoid personal contact with these
voltages.
The
WARNING
heading in a manual explains dangers that might result in
personal injury or death. Always read the associated information very carefully
before performing the indicated procedure.
The
CAUTION
heading in a manual 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.
