Agilent Technologies Switch/Measure Electrical Operating Conditions, Transients, Module inputs

Features and Functions 2

Electrical Operating Conditions

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.

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.

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.

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.

CAUTION	Install current limiting devices between high energy sources and the
	module inputs.

34980A User’s Guide 29