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Detailed Block Diagram Descriptions
Differences Between the Cards
Features Common to Both Cards
E6198B Switch/Load Unit User Manual
• Automatic disconnecting of column relays for minimal
loading of the Analog Bus,
• A single control bit can open all relays (OAR),
• Auxiliary or direct row access relays on each row,
• Independently switchable series resistance protection on
each column.
Figure 6-2
is a detailed block diagram of the Agilent E8792A
32-Pin Matrix Card and
the Agilent E8793A 32-Pin Matrix Card.
The primary difference between the two cards is that the
Agilent E8792A contains a 16 x 5 Instrument Matrix. The
Instrument Matrix is used to connect measurement or source
instruments to the Analog Bus. Also notice in <Blue>Figure the
DAC1 or DAC2 inputs to the Instrument Matrix. These lines
come from the Switch/Load Units DACs and can be switched
into the Instrument Matrix. The Agilent E8793A also contains
two additional sets of Analog Bus access on connector J1. Other
than these differences, the two cards are electrically and
functionally identical. The following discussion applies to both
cards.
The 32-Pin Matrix Modules contain a 32 x 4 matrix of relays,
additional relays to connect/disconnect signals on the buses,
programmable registers to control the relays (described in
Appendix B), and various other features. All relays are of the
high-speed, dry reed type for fast switching.
As shown in
Figure 6-2
is arranged in 32 rows that can be connected to any of four
columns on the common Analog Bus. Closing a matrix relay
connects a row to a column on the card. The columns are
connected to the Analog Bus which carries the signal between
the UUT (unit under test) and instruments connected to the
Analog Bus through the Agilent E8792A. This 32 x 4 structure
lets you connect any system resource to any pin on the UUT.
This matrix along with the unswitched UUT Common allows as
many as four system resources to be connected simultaneously.
Using the Pin Matrix Cards
Figure 6-3
is a detailed block diagram of
and
Figure
6-3, the Measurement Matrix
6
6-3
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