Agilent Technologies L4400 - Manual (Page 15)

Pollution Degree 1: No pollution or only dry, non-conductive
pollution occurs. The pollution has no influence (on insulation)
(IEC 61010-1 2nd Edition).
Pollution Degree 2: Normally only non-conductive pollution
occurs. Occasionally, a temporary conductivity (leakage current
between isolated conductors) caused by condensation can be
expected (IEC 61010-1 2nd Edition).
Introduction to the L4400 Series LXI Instruments 1
L4400 User’s Guide 3
Electrical Operating Conditions
Transients
The L4421A, L4433A, and L4437A 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 L4445A, L4450A, L4451A, and L4452A 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 instruments 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 instrument inputs are connected to
high- energy sources.
N O T E
N O T E
WA R N I N G
To avoid electric shock, turn off the L4400 instrument and
disconnect or de-energize all field wiring to the instrument
and to the analog bus connector (if present) before removing
any terminal block covers.
C A U T I O N
Install current limiting devices between high energy sources and
the module inputs.