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Using Load Cards and Loads 5

E6198B Switch/Load Unit User Manual 5-87

Load Circuit Details

Figure 5-61 shows the details of the load configuration circuit.

Note that each power node is shared by two channels. (See

“Connecting Loads" for details on connecting power to loads on

the mezzanine cards.)

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

J808–J813, and each NC terminal is connected to a pin on

J802–J807. Each pin on J802–J813 can be connected to any of

the four power busses on J801 via jumper wires (Figure 5-54).

The terminal block jumpering allows convenient pull-up or

pull-down of the various inputs. It also lets you terminate 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 J802–J807 together and one that ties all the

pins on J808–J813 together. The NO pins are also jumpered to

power bus 2, and the NC pins are jumpered to power bus 1. You

Figure 5-61 Load Circuit Details

Node Name:

Loadx.y, where y= 1 or 2

Comx

Chanx

Node name: NOx, x+1

Node name: NCx, x+1

Pwrx, x+1

"Phantom" switch for switchpath editor (busload)

Node Names:

Loadx+1.y, where y=1 or 2

Node Name:

Comx+1.y, where y= 1 or 2

Comx+1

Chanx+1

User-installed jumper

x = channel number

Node Name:

Comx.y, where y= 1 or 2

Agilent Technologies E6198B User Manual

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