Keysight Technologies 34959A Service Manual page 7

HIGH ENERGY SOURCES
WARNING
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 Mainframe User's Guide for full
details.
Keysight 34980A Service Guide 7