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Features and Functions 2
34980A User’s Guide 29
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.