5-48 E6198B Switch/Load Unit User Manual
5 Using Load Cards and Loads
Card Layout
Selecting a Power Supply Configuration
Each channel connects to the power bus via a Form C SPDT
(single-pole, double-throw) relay. This relay has a NO
(normally-open) and a NC (normally-closed) terminal. Each NO
terminal is connected to a pin on J3-J8, and each NC terminal is
connected to a pin on J10-J15. Each pin on J3-J15 can be
connected to any of the four power busses on J9 via jumper
wires. See Figure 5-33. The terminal block jumper allows
convenient pull-up or pull-down of the various inputs. It also
allows for terminating a UUT load at a different voltage than
ground.
The factory default is to provide two jumper combs, one that
ties all the pins on J3-J8 together and one that ties all the pins
on J10-J15 together. The NO pins are jumpered to power bus 2,
Figure 5-34 The U7177A Layout
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