Using the Pin Matrix Cards 6
E6198B Switch/Load Unit User Manual 6-17
• 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.
Detailed Block Diagram Descriptions
Figure 6-12 is a detailed block diagram of the Agilent E8782A
Pin Matrix Card and Figure 6-13 is a detailed block diagram of
the Agilent E8783A Pin Matrix Card.
Differences Between the Cards
The Agilent E8782A contains a 24 x 5 Instrument Matrix and 40
x 4 Measurement Matrix. The Instrument Matrix is used to
connect measurement or source instruments to the Analog Bus.
Also notice in Figure 6-12 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. It
also contains two additional sets of Analog Bus access on
connector J1. The Agilent E8783A contains 64 x 4 Measurement
Matrix only.
Features Common to Both Cards
The Pin Matrix Modules contain a 40 x 4 matrix of relays (for
E8782A) or 64 x 4 matrix of relays (for E8783A), 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 6-12 and Figure 6-13, the Measurement
Matrix is arranged in 64 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 E8782A. This 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.
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