Keysight Technologies 34959A Service Manual page 6

When working with hazardous voltage levels, intentional closing of multiple
WARNING
bus and channel relays could cause a potential shock hazard on external
connections. Use extreme caution when handling, testing and adjusting this
instrument. Do not perform these procedures unless qualified to do so.
Failure to recognize and observe normal safety precautions could result in
personal injury or death.
In a matrix switch configuration, any one of the signal sources can be
connected to any one of the test inputs. Be aware that with a matrix, it is
possible to connect more than one source at the same time. Therefore, it is
important to make sure that hazardous or unwanted conditions are not
created by these connections.
It is possible to connect more than one voltage level at the same time when
using this system. Ensure that hazardous or unwanted conditions are not
created by these connections. Failure to recognize or observe normal safety
precautions could result in equipment damage and may result in hazardous
conditions such as fire or shock and could lead to personal injury or death.
Do not connect the Analog Buses directly to a mains power outlet. If it is
WARNING
necessary to measure a mains voltage or any circuit where a large inductive
load may be switched, you must add signal conditioning elements to reduce
the potential transients before they reach the Analog Buses.
Modules 34923A, 34924A, 34933A are rated for a maximum transient of 750
Vpeak. Module 34934A is rated for a maximum transient of 450 Vpeak. All
other modules are rated for 1000 Vpeak. Typically, these transient
overvoltages result from switching inductive loads or from nearby lighting
strikes. The lightning-caused transient overvoltages that may occasionally
occur on a mains power outlets may be as high as 2500 Vpeak.
6 Keysight 34980A Service Guide