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High Energy Sources: The instruments are designed to handle inputs up to
WARNING
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. The overcurrent protection is to be rated for the
maximum available short circuit current of the hazardous sources. Ensure
that the current limiting devices / snubber circuits are appropriate for the
signal being tested. Failure to do so may result in hazardous conditions such
as fire or shock and could lead to personal injury or death. Refer to
34980A
Current Limiting Graphs
for the current limiting graphs of 34890A.
Hardware Power-Fail Jumper
A hardware jumper on the 34937A and 34938A modules allows you to define the
power-failure states for the modules' 5 A latching relays. Depending on the
position of the jumper, the 5 A relays will either open or maintain state when
system power failure occurs.
On the 34939A module, a hardware jumper allows you to define the power-failure
state affecting all 64 of the module's 1 A latching relays. Depending on the
position of the jumper, these relays will either open or maintain state when system
power failure occurs.
The jumpers are positionable across pins 1–2 ("Open" position) or across pins 2–3
("Maintain" position). When shipped from the factory, the power-fail jumper is in
the Maintain position (i.e. all relays maintain their present state when power fails).
Keysight 34937A-34939A User's Guide
17
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