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94 34980A User’s Guide
3 Introduction to the Plug-In Modules for the 34980A
Transients
The 34921A, 34922A, 34923A, 34924A, 34925A, 34931A, 34932A, 34933A,
34937A, and 34938A modules 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.
The 34941A, 34942A, 34945A, 34946A, 34947A, 34950A, 34951A, 34952A
and 34959A modules are intended for only low-voltage applications, and
should not be connected to circuits that may generate or conduct large
transient voltages.
High Energy Sources
These modules 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 a module can handle. It is important to provide external current
limiting, such as fuses, if the module inputs are connected to high-energy
sources.
WARNING
Do not connect any of the modules 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 module or the Analog Buses.
CAUTION
Install current limiting devices between high energy sources and
the module inputs.