Agilent 34980A  Multifunction Switch/Measure Unit *34980-90005*

4 Introduction to the Plug-In Modules for the 34980A
Electrical Operating Conditions
WARNING
Transients
The 34921A, 34922A, 34923A, 34924A, 34925A, 34931A, 34932A, 34933A,
34934A, 34937A, 34938A and 34939A 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.
WARNING
High Energy Sources
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.
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.
CAUTION
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.
Install current limiting devices between high energy sources and
the module inputs.
170 Agilent 34980A Mainframe User’s Guide