5-80 E6198B Switch/Load Unit User Manual
5 Using Load Cards and Loads
Connecting Loads
Loads are mounted on the Agilent N9378A’s mezzanine cards
(Figure 5-56). Up to four loads per channel can fit on each
mezzanine card.
• The mezzanine cards plug into the 1-3 upper and 1-3 lower
positions on the load card. The channel number depends on
the placement of the mezzanine card. See Figure 5-54 for
details of card placement and channel locations. You can also
read the channel assignments from the printing on the front
or back of the load card. (You may need to hold the load card
at an angle to see the printing from the front when the
mezzanine cards are installed.)
• The Mezzanine ID pins are located in pairs numbered 1-4 at
the top of the card. This lets you identify each mezzanine
card using a four-digit binary number (least-significant digit
on the left at ID 1) that you can read back through the
interface using the
loadCardGetInfo action. (See the
TS-5000 System Software User’s Guide for more
information.) All four bits are pulled to a high state on the
load card PCA, so the default readback value is 0xF
h
. The left
pin of each pair is the digital input, and the right pin is
ground. Shorting a wire across the pair pulls the bit to the
low binary state.
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