Agilent Technologies 34939A - Manual (Page 9)

Operating Considerations.
Agilent 34937A-34939A General Purpose Switch Modules User’s Guide 3
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).
After a five- to ten- second delay, remove the sheet metal cover from the
module and move the position of the jumper mounted on the module. See
the figure below for the jumper’s location on the module.
WA R N I N G
Before changing the position of the jumper, remove external
connections from the module. Wait five to ten seconds to allow the
module’s internal capacitors to discharge.
U205
U301
C301
Maintain
Power Down State
Open
1 1
2 2
3 3