Hardware Power-Fail Jumper - Keysight Technologies 34937A User Manual

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).
Before changing the position of the jumper, remove external connections
WARNING
from the module. Wait five to ten seconds to allow the module's internal
capacitors to discharge.
Keysight 34937A-34939A User's Guide 11