Switch/Load Unit and Plug-In Cards 3
E6198B Switch/Load Unit User Manual 3-7
also connect an additional (spare) power supply to the
Switch/Load Unit backplane, see “Connecting an Additional
(Spare) Power Supply for details.
Current Sense
The Isense+ and Isense- lines sense current on a selected load
card channel. They connect to the current sense bus on the SLU
backplane. Current sense lines of each channel are multiplexed.
Only one channel can connect to the current sense bus at one
time.
Power Bus Sense
Power Bus Sense lines 1-4 remotely sense power supplies
connected to power buses 1-4. This sensing compensates the
losses in the system wiring to ensure the set voltage is applied
to the sense point.
Switch/Load Unit Block Diagram
Figure 3-5 shows a block diagram of the SLU. All plug-in cards
are optional so your system will have a different mix of cards
from that shown here. The Test System Interface or Mass
Interconnect are also optional--you can also interface directly to
the Switch/Load Unit. See Chapter 4 for details.
Power supplies +5V, +12V and -12V for E6198B have non-resettable
fuses. Spare supply has resettable fuse. If an overload occurs, the fuse(s)
open. To reset the fuse(s), remove power from the Switch/Load Unit for
approximately 20 seconds. The fuse(s) reset when power is re-applied.
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