Keysight 34921A-34925A User’s Guide 7
Removal of the instrument's cover is to be conducted by qualified personnel
only. Only qualified, trained personnel who are aware of the hazards involved
should remove instrument covers. Prevent operators from accessing any
external circuits, test fixtures, cables or wherever hazardous voltages may be
present. Failure to recognize and observe normal safety precautions could
result in personal injury or death.
Under certain conditions, dangerous voltage levels capable of causing injury
or death may remain even after external circuits have been disconnected. To
avoid electrical shock, remove the main power cord from the 34980A and
ensure all connections to the DUT, including field wiring to the instrument
and the analog bus (if present) are deenergized and all circuits are
discharged before coming in contact with the system. Ensure no hazardous
voltages remain on any accessible before handling any part of the
instrument and test setup, making connections to the system, removing
covers or cleaning the instrument.
High Energy Sources: The Analog Buses are designed to handle inputs up to
their rated currents or their rated powers, whichever is less. Under certain
fault conditions, high energy sources could provide substantially more
current or power than the instrument can handle. It is important to provide
external current limiting, such as fuses if the inputs are connected to
high-energy sources. The overcurrent protection is to be rated for the
maximum available short circuit current of the hazardous sources. Ensure
that the current limiting devices / snubber circuits are appropriate for the
signal being tested. Failure to do so may result in hazardous conditions such
as fire or shock and could lead to personal injury or death. Refer to 34980A
Current Limiting Graphs for the current limiting graphs of 34890A.
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