Agilent 34980A Multifunction Switch/Measure Unit *34980-90005*
Agilent 34980A Multifunction Switch/Measure Unit *34980-90005*
Agilent 34980A Multifunction Switch/Measure Unit *34980-90005*
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3 Features and Functions<br />
Electrical Operating Conditions<br />
WARNING<br />
Transients<br />
The Analog Buses and the optional internal DMM are designed to safely<br />
withstand occasional transient overvoltages up to 1000 Vpeak. Typically,<br />
these transient overvoltages result from switching inductive loads or from<br />
nearby lightning strikes. The lightning- caused transient overvoltages that<br />
may occasionally occur on mains power outlets may be as high as<br />
2500 Vpeak. <br />
WARNING<br />
High Energy Sources<br />
To avoid electric shock, turn off the <strong>34980A</strong> and disconnect or<br />
de-energize all field wiring to the modules and the Analog Bus<br />
connector before removing any module or slot cover.<br />
The Analog Buses and the optional internal DMM are designed to handle<br />
inputs up to their rated currents or their rated powers, whichever is less.<br />
Under certain fault conditions, high energy sources could provide<br />
substantially more current or power than the instrument can handle. It is<br />
important to provide external current limiting, such as fuses, if the inputs<br />
are connected to high- energy sources. <br />
CAUTION<br />
Do not connect the Analog Buses directly to a mains power outlet. <br />
If it is necessary to measure a mains voltage or any circuit where a <br />
large inductive load may be switched, you must add signal conditioning<br />
elements to reduce the potential transients before they reach the <br />
Analog Buses.<br />
Install current limiting devices between high energy sources and the<br />
module inputs.<br />
80 <strong>Agilent</strong> <strong>34980A</strong> Mainframe User’s Guide