User Manual

Section
5: Typical applications Model 3760 10-Channel High Current Multiplexer Card
User's Manual
5-2 3760-900-01 Rev. A / July 2017
Guarded application
Non-driven guarded measurements are made with the set up shown in the next figure. The jumper is
installed to provide a guard that completely encloses HI and LO. This guards HI and LO from other
channels on the card for improved channel isolation.
Figure 9: 3760 Guarded floating measurement
Driven guard application
If multiple sources are switched to a DUT using a driven guard, as shown in the next figure, the guard
must be switched. Only connect guard to channel LO (not channel guard) so that the various sources
will not try to drive the common guards. Instrument LO is not switched or is switched by another card
in the next two figures.
Figure 10: Single-pole switch with switched guard
Note that the previous figure labeled B is the same configuration for connecting one source to
multiple DUTs.
LO and GUARD are shorted, as necessary, to allow for the switched guard. LO for the sources and
the DUT must have an external connection.