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Features and Functions
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Keysight 34980A Mainframe User’s Guide
Electrical Operating Conditions
Transients
The Analog Buses and the optional internal DMM are designed to safely withstand
occasional transient overvoltages up to 1000 Vpeak. Typically, these transient
overvoltages result from switching inductive loads or from nearby lightning
strikes. The lightning-caused transient overvoltages that may occasionally occur
on mains power outlets may be as high as 2500 Vpeak.
High Energy Sources
The Analog Buses and the optional internal DMM 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.
WARNING
To avoid electric shock, turn off the 34980A and disconnect or de-energize
all field wiring to the modules and the Analog Bus connector before
removing any module or slot cover.
WARNING
Do not connect the Analog Buses directly to a mains power outlet. If it is
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.
CAUTION
Install current limiting devices between high energy sources and the module
inputs.
