Operator is responsible to maintain safe
operating conditions. To ensure safe
operating conditions, modules should not be
operated beyond the full temperature range
specified in the Environmental and physical
specification. Exceeding safe operating
conditions can result in shorter lifespans,
improper module performance and user
safety issues. When the modules are in use
and operation within the specified full
temperature range is not maintained, module
surface temperatures may exceed safe
handling conditions which can cause
discomfort or burns if touched. In the event
of a module exceeding the full temperature
range, always allow the module to cool before
touching or removing modules from chassis.
Keysight 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.
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.
A
CAUTION
notice denotes a hazard. It calls
attention to an operating procedure, practice,
or the like that, if not correctly performed or
adhered to, could result in damage to the
product or loss of important data. Do not
proceed beyond a
CAUTION
notice until the
indicated conditions are fully understood and
met.
A WARNING notice denotes a hazard. It calls
attention to an operating procedure, practice,
or the like that, if not correctly performed or
adhered to, could result in personal injury or
death. Do not proceed beyond a WARNING
notice until the indicated conditions are fully
understood and met.
Instrumentation 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 circuits
– including the power transformer, test leads,
and input jacks – must be purchased from
Keysight. 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
purchased from other suppliers as long as they
are equivalent to the original component (note
that selected parts should be purchased only
through Keysight to maintain accuracy and
functionality of the product). If you are unsure
about the applicability of a replacement
component, call an Keysight office for
information.
No operator serviceable parts inside. Refer
servicing to qualified personnel. To prevent
electrical shock do not remove covers. For
continued protection against fire hazard,
replace fuse with same type and rating.
Keysight M9391A Software Release Notes
3
